Source: https://up.codes/viewer/tennessee/iecc-2012/chapter/CE_4/ce-commercial-energy-efficiency
Timestamp: 2019-02-23 13:34:56
Document Index: 667354696

Matched Legal Cases: ['art 430', 'art 431', 'art 431', 'art 431', 'art 431', 'art 430', 'art 430', 'art 430', 'art 430', 'art 430', 'art 430', 'art 430', 'art 430', 'art 430', 'art 431', 'art 430', 'art 431', 'art 430', 'art 431', 'art 430', 'art 431']

Chapter 4: [CE] Commercial Energy Efficiency, Energy Conservation Code 2012 of Tennessee | UpCodes
Energy Conservation Code 2012 of Tennessee
C401 General
C402 Building Envelope Requirements
C402.1 General (Prescriptive)
C402.1.1 Insulation and Fenestration Criteria
C402.1.2 U-Factor Alternative
C402.2 Specific Insulation Requirements (Prescriptive)
C402.2.1 Roof Assembly
C402.2.1.1 Roof Solar Reflectance and Thermal Emittance
C402.2.2 Classification of Walls
C402.2.2.1 Above-Grade Walls
C402.2.2.2 Below-Grade Walls
C402.2.3 Thermal Resistance of Above-Grade Walls
C402.2.4 Thermal Resistance of Below-Grade Walls
C402.2.5 Floors Over Outdoor Air or Unconditioned Space
C402.2.6 Slabs on Grade
C402.2.7 Opaque Doors
C402.2.8 Insulation of Radiant Heating Systems
C402.3 Fenestration (Prescriptive)
C402.3.1 Maximum Area
C402.3.1.1 Increased Vertical Fenestration Area With Daylighting Controls
C402.3.1.2 Increased Skylight Area With Daylighting Controls
C402.3.2 Minimum Skylight Fenestration Area
C402.3.2.1 Lighting Controls in Daylight Zones Under Skylights
C402.3.2.2 Haze Factor
C402.3.3 Maximum U-Factor and SHGC
C402.3.3.1 SHGC Adjustment
C402.3.3.2 Increased Vertical Fenestration SHGC
C402.3.3.3 Increased Skylight SHGC
C402.3.3.4 Increased Skylight U-Factor
C402.3.3.5 Dynamic Glazing
C402.3.4 Area-Weighted U-Factor
C402.4 Air Leakage (Mandatory)
C402.4.1 Air Barriers
C402.4.1.1 Air Barrier Construction
C402.4.1.2 Air Barrier Compliance Options
C402.4.1.2.1 Materials
C402.4.1.2.2 Assemblies
C402.4.1.2.3 Building Test
C402.4.2 Air Barrier Penetrations
C402.4.3 Air Leakage of Fenestration
C402.4.4 Doors and Access Openings to Shafts, Chutes, Stairways, and Elevator Lobbies
C402.4.5 Air Intakes, Exhaust Openings, Stairways and Shafts
C402.4.5.1 Stairway and Shaft Vents
C402.4.5.2 Outdoor Air Intakes and Exhausts
C402.4.6 Loading Dock Weatherseals
C402.4.7 Vestibules
C402.4.8 Recessed Lighting
C403 Building Mechanical Systems
C403.1 General
C403.2 Provisions Applicable to All Mechanical Systems (Mandatory)
C403.2.1 Calculation of Heating and Cooling Loads
C403.2.2 Equipment and System Sizing
C403.2.4 HVAC System Controls
C403.2.4.1 Thermostatic Controls
C403.2.4.1.1 Heat Pump Supplementary Heat
C403.2.4.2 Set Point Overlap Restriction
C403.2.4.3 Off-Hour Controls
C403.2.4.3.1 Thermostatic Setback Capabilities
C403.2.4.3.2 Automatic Setback and Shutdown Capabilities
C403.2.4.3.3 Automatic Start Capabilities
C403.2.4.4 Shutoff Damper Controls
C403.2.4.5 Snow Melt System Controls
C403.2.5 Ventilation
C403.2.5.1 Demand Controlled Ventilation
C403.2.6 Energy Recovery Ventilation Systems
C403.2.7 Duct and Plenum Insulation and Sealing
C403.2.7.1 Duct Construction
C403.2.7.1.1 Low-Pressure Duct Systems
C403.2.7.1.2 Medium-Pressure Duct Systems
C403.2.7.1.3 High-Pressure Duct Systems
C403.2.8 Piping Insulation
C403.2.8.1 Protection of Piping Insulation
C403.2.9 Mechanical Systems Commissioning and Completion Requirements
C403.2.10 Air System Design and Control
C403.2.10.1 Allowable Fan Motor Horsepower
C403.2.10.2 Motor Nameplate Horsepower
C403.2.11 Heating Outside a Building
C403.3 Simple HVAC Systems and Equipment (Prescriptive)
C403.3.1 Economizers
C403.3.1.1 Air Economizers
C403.3.1.1.1 Design Capacity
C403.3.1.1.2 Control Signal
C403.3.1.1.3 High-Limit Shutoff
C403.3.1.1.4 Relief of Excess Outdoor Air
C403.3.2 Hydronic System Controls
C403.4 Complex HVAC Systems and Equipment. (Prescriptive)
C403.4.1 Economizers
C403.4.1.1 Design Capacity
C403.4.1.2 Maximum Pressure Drop
C403.4.1.3 Integrated Economizer Control
C403.4.1.4 Economizer Heating System Impact
C403.4.2 Variable Air Volume (VAV) Fan Control
C403.4.2.1 Static Pressure Sensor Location
C403.4.2.2 Set Points for Direct Digital Control
C403.4.3 Hydronic Systems Controls
C403.4.3.1 Three-Pipe System
C403.4.3.2 Two-Pipe Changeover System
C403.4.3.3 Hydronic (Water Loop) Heat Pump Systems
C403.4.3.3.1 Temperature Dead Band
C403.4.3.3.2 Heat Rejection
C403.4.3.3.2.1 Climate Zones 3 and 4
C403.4.3.3.2.2 Climate Zones 5 Through 8
C403.4.3.3.3 Two Position Valve
C403.4.3.4 Part Load Controls
C403.4.3.5 Pump Isolation
C403.4.4 Heat Rejection Equipment Fan Speed Control
C403.4.5 Requirements for Complex Mechanical Systems Serving Multiple Zones
C403.4.5.1 Single Duct Variable Air Volume (VAV) Systems, Terminal Devices
C403.4.5.2 Dual Duct and Mixing VAV Systems, Terminal Devices
C403.4.5.3 Single Fan Dual Duct and Mixing VAV Systems, Economizers
C403.4.5.4 Supply-Air Temperature Reset Controls
C403.4.6 Heat Recovery for Service Water Heating
C404 SERVICE WATER HEATING (Mandatory)
C404.1 General
C404.2 Service Water-Heating Equipment Performance Efficiency
C404.3 Temperature Controls
C404.4 Heat Traps
C404.5 Pipe Insulation
C404.6 Hot Water System Controls
C404.7 Pools and Inground Permanently Installed Spas (Mandatory)
C404.7.1 Heaters
C404.7.2 Time Switches
C404.7.3 Covers
C405 Electrical Power and Lighting Systems (Mandatory)
C405.1 General (Mandatory)
C405.2 Lighting Controls (Mandatory)
C405.2.1 Manual Lighting Controls
C405.2.1.1 Interior Lighting Controls
C405.2.1.2 Light Reduction Controls
C405.2.2 Additional Lighting Controls
C405.2.2.1 Automatic Time Switch Control Devices
C405.2.2.2 Occupancy Sensors
C405.2.2.3 Daylight Zone Control
C405.2.2.3.1 Manual Daylighting Controls
C405.2.2.3.2 Automatic Daylighting Controls
C405.2.2.3.3 Multi-Level Lighting Controls
C405.2.3 Specific Application Controls
C405.2.4 Exterior Lighting Controls
C405.3 Tandem Wiring (Mandatory)
C405.4 Exit Signs (Mandatory)
C405.5 Interior Lighting Power Requirements (Prescriptive)
C405.5.1 Total Connected Interior Lighting Power
C405.5.1.1 Screw Lamp Holders
C405.5.1.2 Low-Voltage Lighting
C405.5.1.3 Other Luminaires
C405.5.1.4 Line-Voltage Lighting Track and Plug-In Busway
C405.5.2 Interior Lighting Power
C405.6 Exterior Lighting (Mandatory)
C405.6.1 Exterior Building Grounds Lighting
C405.6.2 Exterior Building Lighting Power
C405.7 Electrical Energy Consumption (Mandatory)
C406 Additional Efficiency Package Options
C406.1 Requirements
C406.2 Efficient HVAC Performance
C406.3 Efficient Lighting System
C406.3.1 Reduced Lighting Power Density
C406.4 On-Site Renewable Energy
C407 Total Building Performance
C407.1 Scope
C407.2 Mandatory Requirements
C407.3 Performance-Based Compliance
C407.4 Documentation
C407.4.1 Compliance Report
C407.4.2 Additional Documentation
C407.5 Calculation Procedure
C407.5.1 Building Specifications
C407.5.2 Thermal Blocks
C407.5.2.1 HVAC Zones Designed
C407.5.2.2 HVAC Zones Not Designed
C407.5.2.3 Multifamily Residential Buildings
C407.6 Calculation Software Tools
C407.6.1 Specific Approval
C407.6.2 Input Values
C408 System Commissioning
C408.1 General
C408.2 Mechanical Systems Commissioning and Completion Requirements
C408.2.1 Commissioning Plan
C408.2.2 Systems Adjusting and Balancing
C408.2.2.1 Air Systems Balancing
C408.2.2.2 Hydronic Systems Balancing
C408.2.3 Functional Performance Testing
C408.2.3.1 Equipment
C408.2.3.2 Controls
C408.2.3.3 Economizers
C408.2.4 Preliminary Commissioning Report
C408.2.4.1 Acceptance of Report
C408.2.4.2 Copy of Report
C408.2.5 Documentation Requirements
C408.2.5.1 Drawings
C408.2.5.2 Manuals
C408.2.5.3 System Balancing Report
C408.2.5.4 Final Commissioning Report
Section C401 General
C401.1 Scope.
The requirements contained in this chapter are applicable to commercial buildings, or portions of commercial buildings. C401.2 Application.
Commercial buildings shall comply with one of the following:
1. The requirements of ANSI/ASHRAE/IESNA 90.1.
2. The requirements of Sections C402, C403, C404 and C405. In addition, commercial buildings shall comply with either Section C406.2, C406.3 or C406.4.
3. The requirements of Section C407, C402.4, C403.2, C404, C405.2, C405.3, C405.4, C405.6 and C405.7. The building energy cost shall be equal to or less than 85 percent of the standard reference design building.
C401.2.1 Application to existing buildings.
Additions, alterations and repairs to existing buildings shall comply with one of the following:
1. Sections C402, C403, C404 and C405; or
2. ANSI/ASHRAE/IESNA 90.1.
Section C402 Building Envelope Requirements
The building thermal envelope shall comply with Section C402.1.1. Section C402.1.2 shall be permitted as an alternative to the R-values specified in Section C402.1.1.
The building thermal envelope shall meet the requirements of Tables C402.2 and C402.3 based on the climate zone specified in Chapter 3 . Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the R-values from the “Group R” column of Table C402.2. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the R-values from the “All other” column of Table C402.2. Buildings with a vertical fenestration area or skylight area that exceeds that allowed in Table C402.3 shall comply with the building envelope provisions of ANSI/ASHRAE/IESNA 90.1.
An assembly with a U-factor, C-factor, or F-factor equal or less than that specified in Table C402.1.2 shall be permitted as an alternative to the R-value in Table C402.2. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the U-factor, C-factor, or F-factor from the “Group R” column of Table C402.1.2. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the U-factor, C-factor or F-factor from the “All other” column of Table C402.1.2.
TABLE C402.1.2
OPAQUE THERMAL ENVELOPE ASSEMBLY REQUIREMENTSa
CLIMATE ZONE 1 2 3 4 EXCEPT MARINE 5 AND MARINE 4 6 7 8
All other Group R All other Group R All other Group R All other Group R All other Group R All other Group R All other Group R All other Group R
Insulation entirely
above deck U-0.048 U-0.048 U-0.048 U-0.048 U-0.048 U-0.048 U-0.039 U-0.039 U-0.039 U-0.039 U-0.032 U-0.032 U-0.028 U-0.028 U-0.028 U-0.028
Metal buildings U-0.044 U-0.035 U-0.035 U-0.035 U-0.035 U-0.035 U-0.035 U-0.035 U-0.035 U-0.035 U-0.031 U-0.031 U-0.029 U-0.029 U-0.029 U-0.029
Attic and other U-0.027 U-0.027 U-0.027 U-0.027 U-0.027 U-0.027 U-0.027 U-0.027 U-0.027 U-0.021 U-0.021 U-0.021 U-0.021 U-0.021 U-0.021 U-0.021
Mass U-0.142 U-0.142 U-0.142 U-0.123 U-0.110 U-0.104 U-0.104 U-0.090 U-0.078 U-0.078 U-0.078 U-0.071 U-0.061 U-0.061 U-0.061 U-0.061
Metal building U-0.079 U-0.079 U-0.079 U-0.079 U-0.079 U-0.052 U-0.052 U-0.052 U-0.052 U-0.052 U-0.052 U-0.052 U-0.052 U-0.039 U-0.052 U-0.039
Metal framed U-0.077 U-0.077 U-0.077 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.057 U-0.064 U-0.052 U-0.045 U-0.045
Wood framed and
other U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.064 U-0.051 U-0.051 U-0.051 U-0.051 U-0.036 U-0.036
Below-grade wallb C-1.140 C-1.140 C-1.140 C-1.140 C-1.140 C-1.140 C-0.119 C-0.119 C-0.119 C-0.119 C-0.119 C-0.119 C-0.092 C-0.092 C-0.092 C-0.092
Mass U-0.322 U-0.322 U-0.107 U-0.087 U-0.076 U-0.076 U-0.076 U-0.074 U-0.074 U-0.064 U-0.064 U-0.057 U-0.055 U-0.051 U-0.055 U-0.051
Joist/framing U-0.066 U-0.066 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033 U-0.033
Unheated slabs F-0.73 F-0.73 F-0.73 F-0.73 F-0.73 F-0.73 F-0.54 F-0.54 F-0.54 F-0.54 F-0.54 F-0.52 F-0.40 F-0.40 F-0.40 F-0.40
Heated slabs F-0.70 F-0.70 F-0.70 F-0.70 F-0.70 F-0.70 F-0.65 F-0.65 F-0.58 F-0.58 F-0.58 F-0.58 F-0.55 F-0.55 F-0.55 F-0.55
a. Use of opaque assembly U-factors, C-factors, and F-factors from ANSI/ASHRAE/IESNA 90.1 Appendix A shall be permitted, provided the construction complies with the applicable construction details from ANSI/ASHRAE/IESNA 90.1 Appendix A.
b. Where heated slabs are below grade, below-grade walls shall comply with the F-factor requirements for heated slabs.
Opaque assemblies shall comply with Table C402.2. Where two or more layers of continuous insulation board are used in a construction assembly, the continuous insulation boards shall be installed in accordance with Section C303.2. If the continuous insulation board manufacturer’s installation instructions do not address installation of two or more layers, the edge joints between each layer of continuous insulation boards shall be staggered.
TABLE C402.2
OPAQUE THERMAL ENVELOPE REQUIREMENTSa
above deck R-20ci R-20ci R-20ci R-20ci R-20ci R-20ci R-25ci R-25ci R-25ci R-25ci R-30ci R-30ci R-35ci R-35ci R-35ci R-35ci
(with R-5 thermal blocks)a, b R-19 +
R-11 LS R-19 +
R11 LS R-19 +
R-11 LS R-25 +
R-11 LS R-30 +
Attic and other R-38 R-38 R-38 R-38 R-38 R-38 R-38 R-38 R-38 R-49 R-49 R-49 R-49 R-49 R-49 R-49
Massc R-5.7cic R-5.7cic R-5.7cic R-7.6ci R-7.6ci R-9.5ci R-9.5ci R-11.4ci R-11.4ci R-13.3ci R-13.3ci R-15.2ci R-15.2ci R-15.2ci R-25ci R-25ci
Metal building R-13+
R-6.5ci R-13 +
R-6.5ci R13 +
R-13ci R-13 +
R-13ci R-13+
R-19.5ci R-13 +
R-19.5ci
Metal framed R-13 +
R-5ci R-13 +
R-7.5ci R-13 +
R-15.6ci R-13 +
R-7.5ci R-13+ R17.5ci
other R-13 +
R-3.8ci or R-20 R-13 +
or R-20 R-13 +
or R-20 +
R-3.8ci R-13 +
R-15.6ci
or R-20 + R-10ci R-13 +
or R-20 + R-10ci
Below-grade walld NR NR NR NR NR NR R-7.5ci R-7.5ci R-7.5ci R-7.5ci R-7.5ci R-7.5ci R-10ci R-10ci R-10ci R-12.5ci
Mass NR NR R-6.3ci R-8.3ci R-10ci R-10ci R-10ci R-10.4ci R-10ci R-12.5ci R-12.5ci R-12.5ci R-15ci R-16.7ci R-15ci R-16.7ci
Joist/framing NR NR R-30 R-30 R-30 R-30 R-30 R-30 R-30 R-30 R-30 R-30e R-30e R-30e R-30e R-30e
Unheated slabs NR NR NR NR NR NR R-10 for
24″ below R-10 for
24″ below R-15 for
24″ below R-20 for
24″below
Heated slabsd R-7.5 for
12″ below R-7.5 for
12″ below R-10 for
36″ below R-15 for
36″ below R-20 for
48″ below R-20 for
48″ below
Swinging U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37
Roll-up or sliding R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75
For SI: 1 inch = 25.4 mm. ci = Continuous insulation. NR = No requirement.
LS = Liner System—A continuous membrane installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins.
a. Assembly descriptions can be found in ANSI/ASHRAE/IESNA Appendix A.
b. Where using R-value compliance method, a thermal spacer block shall be provided, otherwise use the U-factor compliance method in Table C402.1.2.
c. R-5.7ci is allowed to be substituted with concrete block walls complying with ASTM C 90, ungrouted or partially grouted at 32 inches or less on center vertically and 48 inches or less on center horizontally, with ungrouted cores filled with materials having a maximum thermal conductivity of 0.44 Btu-in/h-f2 °F.
d. Where heated slabs are below grade, below-grade walls shall comply with the exterior insulation requirements for heated slabs.
e. Steel floor joist systems shall be insulated to R-38.
The minimum thermal resistance (R-value) of the insulating material installed either between the roof framing or continuously on the roof assembly shall be as specified in Table C402.2, based on construction materials used in the roof assembly. Skylight curbs shall be insulated to the level of roofs with insulation entirely above deck or R-5, whichever is less.
1. Continuously insulated roof assemblies where the thickness of insulation varies 1 inch (25 mm) or less and where the area-weighted U-factor is equivalent to the same assembly with the R-value specified in Table C402.2.
2. Unit skylight curbs included as a component of an NFRC 100 rated assembly shall not be required to be insulated.
Low-sloped roofs, with a slope less than 2 units vertical in 12 horizontal, directly above cooled conditioned spaces in Climate Zones 1, 2, and 3 shall comply with one or more of the options in Table C402.2.1.1.
Exceptions: The following roofs and portions of roofs are exempt from the requirements in Table C402.2.1.1:
1. Portions of roofs that include or are covered by:
1.1. Photovoltaic systems or components.
1.2. Solar air or water heating systems or components.
1.3. Roof gardens or landscaped roofs.
1.4. Above-roof decks or walkways.
1.5. Skylights.
1.6. HVAC systems, components, and other opaque objects mounted above the roof.
2. Portions of roofs shaded during the peak sun angle on the summer solstice by permanent features of the building, or by permanent features of adjacent buildings.
3. Portions of roofs that are ballasted with a minimum stone ballast of 17 pounds per square foot (psf) (74 kg/m2) or 23 psf (117 kg/m2) pavers.
4. Roofs where a minimum of 75 percent of the roof area meets a minimum of one of the exceptions above.
TABLE C402.2.1.1
MINIMUM ROOF REFLECTANCE AND EMITTANCE OPTIONSa
Three-year aged solar reflectanceb of 0.55 and three-year aged thermal emittancec of 0.75
Initial solar reflectanceb of 0.70 and initial thermal emittancec of 0.75
Three-year-aged solar reflectance indexd of 64
Initial solar reflectance indexd of 82
a. The use of area-weighted averages to meet these requirements shall be permitted. Materials lacking initial tested values for either solar reflectance or thermal emittance, shall be assigned both an initial solar reflectance of 0.10 and an initial thermal emittance of 0.90. Materials lacking three-year aged tested values for either solar reflectance or thermal emittance shall be assigned both a three-year aged solar reflectance of 0.10 and a three-year aged thermal emittance of 0.90.
b. Solar reflectance tested in accordance with ASTM C 1549, ASTM E 903 or ASTM E 1918.
c. Thermal emittance tested in accordance with ASTM C 1371 or ASTM E 408.
d. Solar reflectance index (SRI) shall be determined in accordance with ASTM E 1980 using a convection coefficient of 2.1 Btu/h × ft2×°F (12W/m2 × K). Calculation of aged SRI shall be based on aged tested values of solar reflectance and thermal emittance. Calculation of initial SRI shall be based on initial tested values of solar reflectance and thermal emittance.
Walls associated with the building envelope shall be classified in accordance with Section C402.2.2.1 or C402.2.2.2.
Above-grade walls are those walls covered by Section C402.2.3 on the exterior of the building and completely above grade or walls that are more than 15 percent above grade.
Below-grade walls covered by Section C402.2.4 are basement or first-story walls associated with the exterior of the building that are at least 85 percent below grade.
The minimum thermal resistance (R-value) of the insulating materials installed in the wall cavity between the framing members and continuously on the walls shall be as specified in Table C402.2, based on framing type and construction materials used in the wall assembly. The R-value of integral insulation installed in concrete masonry units (CMU) shall not be used in determining compliance with Table C402.2.
“Mass walls” shall include walls weighing not less than:
1. 35 psf (170 kg/m2) of wall surface area; or
2. 25 psf (120 kg/m2) of wall surface area if the material weight is not more than 120 pounds per cubic foot (pcf) (1900 kg/m3).
The minimum thermal resistance (R-value) of the insulating material installed in, or continuously on, the below-grade walls shall be as specified in Table C402.2, and shall extend to a depth of 10 feet (3048 mm) below the outside finished ground level, or to the level of the floor, whichever is less.
The minimum thermal resistance (R-value) of the insulating material installed either between the floor framing or continuously on the floor assembly shall be as specified in Table C402.2, based on construction materials used in the floor assembly.
“Mass floors” shall include floors weighing not less than:
1. 35 psf (170 kg/m2) of floor surface area; or
2. 25 psf (120 kg/m2) of floor surface area if the material weight is not more than 120 pcf (1,900 kg/m3).
Where the slab on grade is in contact with the ground, the minimum thermal resistance (R-value) of the insulation around the perimeter of unheated or heated slab-on-grade floors shall be as specified in Table C402.2. The insulation shall be placed on the outside of the foundation or on the inside of the foundation wall. The insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to at least the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the table. Insulation extending away from the building shall be protected by pavement or by a minimum of 10 inches (254 mm) of soil.
Exception: Where the slab-on-grade floor is greater than 24 inches (61 mm) below the finished exterior grade, perimeter insulation is not required.
Opaque doors (doors having less than 50 percent glass area) shall meet the applicable requirements for doors as specified in Table C402.2 and be considered as part of the gross area of above-grade walls that are part of the building envelope.
Radiant panels, and associated U-bends and headers, designed for sensible heating of an indoor space through heat transfer from the thermally effective panel surfaces to the occupants or indoor space by thermal radiation and natural convection and the bottom surfaces of floor structures incorporating radiant heating shall be insulated with a minimum of R-3.5 (0.62 m2/K × W).
Fenestration shall comply with Table C402.3. Automatic daylighting controls specified by this section shall comply with Section C405.2.2.3.2.
TABLE C402.3
Fixed fenestration 0.50 0.50 0.46 0.38 0.38 0.36 0.29 0.29
Operable fenestration 0.65 0.65 0.60 0.45 0.45 0.43 0.37 0.37
Entrance doors 1.10 0.83 0.77 0.77 0.77 0.77 0.77 0.77
SHGC 0.25 0.25 0.25 0.40 0.40 0.40 0.45 0.45
U-factor 0.75 0.65 0.55 0.50 0.50 0.50 0.50 0.50
SHGC 0.35 0.35 0.35 0.40 0.40 0.40 NR NR
The vertical fenestration area (not including opaque doors and opaque spandrel panels) shall not exceed 30 percent of the gross above-grade wall area. The skylight area shall not exceed 3 percent of the gross roof area.
In Climate Zones 1 through 6, a maximum of 40 percent of the gross above-grade wall area shall be permitted to be vertical fenestration, provided:
1. No less than 50 percent of the conditioned floor area is within a daylight zone;
2. Automatic daylighting controls are installed in daylight zones; and
3. Visible transmittance (VT) of vertical fenestration is greater than or equal to 1.1 times solar heat gain coefficient (SHGC).
Exception: Fenestration that is outside the scope of NFRC 200 is not required to comply with Item 3.
The skylight area shall be permitted to be a maximum of 5 percent of the roof area provided automatic daylighting controls are installed in daylight zones under skylights.
In an enclosed space greater than 10,000 square feet (929 m2), directly under a roof with ceiling heights greater than 15 feet (4572 mm), and used as an office, lobby, atrium, concourse, corridor, storage, gymnasium/exercise center, convention center, automotive service, manufacturing, non-refrigerated warehouse, retail store, distribution/sorting area, transportation, or workshop, the total daylight zone under skylights shall be not less than half the floor area and shall provide a minimum skylight area to daylight zone under skylights of either:
1. Not less than 3 percent with a skylight VT of at least 0.40; or
2. Provide a minimum skylight effective aperture of at least 1 percent determined in accordance with Equation C4-1.
(Equation C4-1)
Exception: Skylights above daylight zones of enclosed spaces are not required in:
1. Buildings in climate zones 6 through 8.
3. Areas where it is documented that existing structures or natural objects block direct beam sunlight on at least half of the roof over the enclosed area for more than 1,500 daytime hours per year between 8 am and 4 pm.
All lighting in the daylight zone shall be controlled by multilevel lighting controls that comply with Section C405.2.2.3.3.
Skylights in office, storage, automotive service, manufacturing, nonrefrigerated warehouse, retail store, and distribution/sorting area spaces shall have a glazing material or diffuser with a measured haze factor greater than 90 percent when tested in accordance with ASTM D 1003.
Exception: Skylights designed to exclude direct sunlight entering the occupied space by the use of fixed or automated baffles, or the geometry of skylight and light well need not comply with Section C402.3.2.2.
For vertical fenestration, the maximum U-factor and solar heat gain coefficient (SHGC) shall be as specified in Table C402.3, based on the window projection factor. For skylights, the maximum U-factor and solar heat gain coefficient (SHGC) shall be as specified in Table C402.3.
The window projection factor shall be determined in accordance with Equation C4-2.
PF = A/B (Equation C4-2)
Where different windows or glass doors have different PF values, they shall each be evaluated separately.
Where the fenestration projection factor for a specific vertical fenestration product is greater than or equal to 0.2, the required maximum SHGC from Table C402.3 shall be adjusted by multiplying the required maximum SHGC by the multiplier specified in Table C402.3.3.1 corresponding with the orientation of the fenestration product and the projection factor.
TABLE C402.3.3.1
SHGC ADJUSTMENT MULTIPLIERS
PROJECTION FACTOR ORIENTED WITHIN 45
DEGREES OF TRUE NORTH ALL OTHER ORIENTATION
0.2 ≤ PF < 0.5 1.1 1.2
PF ≥ 0.5 1.2 1.6
In Climate Zones 1, 2 and 3, vertical fenestration entirely located not less than 6 feet (1729 mm) above the finished floor shall be permitted a maximum SHGC of 0.40.
In Climate Zones 1 through 6, skylights shall be permitted a maximum SHGC of 0.60 where located above daylight zones provided with automated daylighting controls.
Where skylights are installed above daylight zones provided with automatic daylighting controls, a maximum U-factor of 0.9 shall be permitted in Climate Zones 1 through 3; and a maximum U-factor of 0.75 shall be permitted in Climate Zones 4 through 8.
For compliance with Section C402.3.3, the SHGC for dynamic glazing shall be determined using the manufacturer’s lowest-rated SHGC, and the VT/SHGC ratio shall be determined using the maximum VT and maximum SHGC. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.
An area-weighted average shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.3. Individual fenestration products from different fenestration product categories listed in Table C402.3 shall not be combined in calculating area-weighted average U-factor.
The thermal envelope of buildings shall comply with Sections C402.4.1 through C402.4.8.
A continuous air barrier shall be provided throughout the building thermal envelope. The air barriers shall be permitted to be located on the inside or outside of the building envelope, located within the assemblies composing the envelope, or any combination thereof. The air barrier shall comply with Sections C402.4.1.1 and C402.4.1.2.
Exception: Air barriers are not required in buildings located in Climate Zones 1, 2 and 3.
The continuous air barrier shall be constructed to comply with the following:
2. Air barrier joints and seams shall be sealed, including sealing transitions in places and changes in materials. Air barrier penetrations shall be sealed in accordance with Section C402.4.2. The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation.
3. Recessed lighting fixtures shall comply with Section C402.4.8. Where similar objects are installed which penetrate the air barrier, provisions shall be made to maintain the integrity of the air barrier.
Exception: Buildings that comply with Section C402.4.1.2.3 are not required to comply with Items 1 and 3.
A continuous air barrier for the opaque building envelope shall comply with Section C402.4.1.2.1, C402.4.1.2.2, or C402.4.1.2.3.
Materials with an air permeability no greater than 0.004 cfm/ft2 (0.02 L/s • m2) under a pressure differential of 0.3 inches water gauge (w.g.) (75 Pa) when tested in accordance with ASTM E 2178 shall comply with this section. Materials in Items 1 through 15 shall be deemed to comply with this section provided joints are sealed and materials are installed as air barriers in accordance with the manufacturer’s instructions.
1. Plywood with a thickness of not less than 3/8 inch (10 mm).
2. Oriented strand board having a thickness of not less than 3/8 inch (10 mm).
3. Extruded polystyrene insulation board having a thickness of not less than 1/2 inch (12 mm).
4. Foil-back polyisocyanurate insulation board having a thickness of not less than 1/2 inch (12 mm).
5. Closed cell spray foam a minimum density of 1.5 pcf (2.4 kg/m3) having a thickness of not less than 11/2 inches (36 mm).
6. Open cell spray foam with a density between 0.4 and 1.5 pcf (0.6 and 2.4 kg/m3) and having a thickness of not less than 4.5 inches (113 mm).
7. Exterior or interior gypsum board having a thickness of not less than 1/2 inch (12 mm).
8. Cement board having a thickness of not less than 1/2 inch (12 mm).
9. Built up roofing membrane.
10. Modified bituminous roof membrane.
11. Fully adhered single-ply roof membrane.
12. A Portland cement/sand parge, or gypsum plaster having a thickness of not less than 5/8 inch (16 mm).
13. Cast-in-place and precast concrete.
14. Fully grouted concrete block masonry.
15. Sheet steel or aluminum.
Assemblies of materials and components with an average air leakage not to exceed 0.04 cfm/ft2 (0.2 L/s • m2) under a pressure differential of 0.3 inches of water gauge (w.g.)(75 Pa) when tested in accordance with ASTM E 2357, ASTM E 1677 or ASTM E 283 shall comply with this section. Assemblies listed in Items 1 and 2 shall be deemed to comply provided joints are sealed and requirements of Section C402.4.1.1 are met.
1. Concrete masonry walls coated with one application either of block filler and two applications of a paint or sealer coating;
2. A Portland cement/sand parge, stucco or plaster minimum 1/2 inch (12 mm) in thickness.
The completed building shall be tested and the air leakage rate of the building envelope shall not exceed 0.40 cfm/ft2 at a pressure differential of 0.3 inches water gauge (2.0 L/s • m2 at 75 Pa) in accordance with ASTM E 779 or an equivalent method approved by the code official.
Penetrations of the air barrier and paths of air leakage shall be caulked, gasketed or otherwise sealed in a manner compatible with the construction materials and location. Joints and seals shall be sealed in the same manner or taped or covered with a moisture vapor-permeable wrapping material. Sealing materials shall be appropriate to the construction materials being sealed. The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation.
The air leakage of fenestration assemblies shall meet the provisions of Table C402.4.3. Testing shall be in accordance with the applicable reference test standard in Table C402.4.3 by an accredited, independent testing laboratory and labeled by the manufacturer.
1. Field-fabricated fenestration assemblies that are sealed in accordance with Section C402.4.1.
2. Fenestration in buildings that comply with Section C402.4.1.2.3 are not required to meet the air leakage requirements in Table C402.4.3.
TABLE C402.4.3
MAXIMUM AIR INFILTRATION RATE
FOR FENESTRATION ASSEMBLIES
FENESTRATION ASSEMBLY MAXIMUM
RATE (CFM/FT2) TEST PROCEDURE
Windows 0.20a AAMA/WDMA/CSA101/I.S.2/A440
Sliding doors 0.20a
Swinging doors 0.20a
Skylights – with condensation weepage openings 0.30
Skylights – all other 0.20a
Curtain walls 0.06 NFRC 400
ASTM E 283 at 1.57 psf (75 Pa)
Storefront glazing 0.06
Commercial glazed
swinging entrance doors 1.00
Revolving doors 1.00
Garage doors 0.40 ANSI/DASMA 105,
NFRC 400, or
Rolling doors 1.00
For SI: 1 cubic foot per minute = 0.47L/s, 1 square foot = 0.093 m2.
a. The maximum rate for windows, sliding and swinging doors, and skylights is permitted to be 0.3 cfm per square foot of fenestration or door area when tested in accordance with AAMA/WDMA/CSA101/I.S.2/A440 at 6.24 psf (300 Pa).
Doors and access openings from conditioned space to shafts, chutes stairways and elevator lobbies shall either meet the requirements of Section C402.4.3 or shall be gasketed, weatherstripped or sealed.
Exception: Door openings required to comply with Section 716 or 716.4 of the International Building Code; or doors and door openings required by the International Building Code to comply with UL 1784 shall not be required to comply with Section C402.4.4.
Stairway enclosures and elevator shaft vents and other outdoor air intakes and exhaust openings integral to the building envelope shall be provided with dampers in accordance with Sections C402.4.5.1 and C402.4.5.2.
Stairway and shaft vents shall be provided with Class I motorized dampers with a maximum leakage rate of 4 cfm/ft2 (20.3 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
Stairway and shaft vent dampers shall be installed with controls so that they are capable of automatically opening upon:
1. The activation of any fire alarm initiating device of the building’s fire alarm system; or
2. The interruption of power to the damper.
Outdoor air supply and exhaust openings shall be provided with Class IA motorized dampers with a maximum leakage rate of 4 cfm/ft2 (20.3 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
1. Gravity (nonmotorized) dampers having a maximum leakage rate of 20 cfm/ft2 (101.6 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D are permitted to be used as follows:
1.1. In buildings for exhaust and relief dampers.
1.2. In buildings less than three stories in height above grade.
1.3. For ventilation air intakes and exhaust and relief dampers in buildings of any height located in Climate Zones 1, 2 and 3.
1.4. Where the design outdoor air intake or exhaust capacity does not exceed 300 cfm (141 L/s).
Gravity (nonmotorized) dampers for ventilation air intakes shall be protected from direct exposure to wind.
2. Dampers smaller than 24 inches (610 mm) in either dimension shall be permitted to have a leakage of 40 cfm/ft2 (203.2 L/s• m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
All building entrances shall be protected with an enclosed vestibule, with all doors opening into and out of the vestibule equipped with self-closing devices. Vestibules shall be designed so that in passing through the vestibule it is not necessary for the interior and exterior doors to open at the same time. The installation of one or more revolving doors in the building entrance shall not eliminate the requirement that a vestibule be provided on any doors adjacent to revolving doors.
1. Buildings in Climate Zones 1 and 2.
2. Doors not intended to be used by the public, such as doors to mechanical or electrical equipment rooms, or intended solely for employee use.
Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC-rated and labeled as having an air leakage rate of not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires shall be sealed with a gasket or caulk between the housing and interior wall or ceiling covering.
Mechanical systems and equipment serving the building heating, cooling or ventilating needs shall comply with Section C403.2 (referred to as the mandatory provisions) and either:
1. Section C403.3 (Simple systems); or
2. Section C403.4 (Complex systems).
Mechanical systems and equipment serving the building heating, cooling or ventilating needs shall comply with Sections C403.2.1 through C403.2.11.
Design loads shall be determined in accordance with the procedures described in ANSI/ASHRAE/ACCA Standard 183. The design loads shall account for the building envelope, lighting, ventilation and occupancy loads based on the project design. Heating and cooling loads shall be adjusted to account for load reductions that are achieved where energy recovery systems are utilized in the HVAC system in accordance with the ASHRAE HVAC Systems and Equipment Handbook. Alternatively, design loads shall be determined by an approved equivalent computation procedure, using the design parameters specified in Chapter 3 .
The output capacity of heating and cooling equipment and systems shall not exceed the loads calculated in accordance with Section C403.2.1. A single piece of equipment providing both heating and cooling shall satisfy this provision for one function with the capacity for the other function as small as possible, within available equipment options.
Equipment shall meet the minimum efficiency requirements of Tables C403.2.3(1), C403.2.3(2), C403.2.3(3), C403.2.3(4), C403.2.3(5), C403.2.3(6), C403.2.3(7) and C403.2.3(8) when tested and rated in accordance with the applicable test procedure. Plate-type liquid-to-liquid heat exchangers shall meet the minimum requirements of Table C403.2.3(9). The efficiency shall be verified through certification under an approved certification program or, if no certification program exists, the equipment efficiency ratings shall be supported by data furnished by the manufacturer. Where multiple rating conditions or performance requirements are provided, the equipment shall satisfy all stated requirements. Where components, such as indoor or outdoor coils, from different manufacturers are used, calculations and supporting data shall be furnished by the designer that demonstrates that the combined efficiency of the specified components meets the requirements herein.
MINIMUM EFFICIENCY REQUIREMENTS:
ELECTRICALLY OPERATED UNITARY AIR CONDITIONERS AND CONDENSING UNITS
SECTION TYPE SUBCATEGORY OR
RATING CONDITION MINIMUM EFFICIENCY TEST PROCEDUREa
Before 6/1/2011 As of 6/1/2011
air cooled < 65,000 Btu/hb All Split System 13.0 SEER 13.0 SEER AHRI
Single Package 13.0 SEER 13.0 SEER
(air cooled) ≤ 30,000 Btu/hb All Split system 12.0 SEER 12.0 SEER
(air cooled) < 65,000 Btu/hb All Split System 10.0 SEER 10.0 SEER
air cooled ≥65,000 Btu/h
(or None) Split System and
Single Package 11.2 EER
11.4 IEER 11.2 EER
11.4 IEER AHRI
Single Package 11.0 EER
11.2 IEER 11.0 EER
≥135,000 Btu/h
Single Package 10.8 EER
11.0 IEER 10.8 EER
Single Package 10.0 EER
10.1 IEER 10.0 EER
Single Package 9.8 EER
9.9 IEER 9.8 EER
Single Package 9.7 EER
9.8 IEER 9.7 EER
Single Package 9.5 EER
9.6 IEER 9.5 EER
water cooled < 65,000 Btu/hb All Split System and
Single Package 12.1 EER
12.3 IEER 12.1 EER
12.3 IEER AHRI
Single Package 11.5 EER
11.7 IEER 12.1 EER
Single Package 11.3 EER
11.5 IEER 11.9 EER
11.2 IEER 12.5 EER
12.7 IEER
11.0 IEER 12.3 EER
11.1 IEER 12.4 EER
10.9 IEER 12.2 EER
11.1 IEER 12.0 EER
10.9 IEER 12.0 EER
TABLE C403.2.3(1)—continued
SECTION TYPE SUB-CATEGORY OR
RATING CONDITION MINIMUM EFFICIENCY TEST
evaporatively cooled < 65,000 Btu/hb All Split System and
11.2 IEER 12.0 EER
11.0 IEER 11.8 EER
11.1 EER 11.9 EER
10.9 EER 12.2 EER
11.1 EER 11.7 EER
10.9 EER 11.5 EER
air cooled ≥ 135,000 Btu/h 10.1 EER
11.4 IEER 10.5 EER
14.0 IEER AHRI
water cooled ≥ 135,000 Btu/h 13.1 EER
13.6 IEER 13.5 EER
evaporatively cooled ≥ 135,000 Btu/h 13.1 EER
a. Chapter 6 of the referenced standard contains a complete specification of the referenced test procedure, including the reference year version of the test procedure.
b. Single-phase, air-cooled air conditioners less than 65,000 Btu/h are regulated by NAECA. SEER values are those set by NAECA.
ELECTRICALLY OPERATED UNITARY AND APPLIED HEAT PUMPS
EQUIPMENT TYPE SIZE CATEGORY HEATING SECTION TYPE SUBCATEGORY OR
RATING CONDITION MINIMUM
(cooling mode) < 65,000 Btu/hb All Split System 13.0 SEER AHRI
Single Packaged 13.0 SEER
air cooled ≤ 30,000 Btu/hb All Split System 13.0 SEER
Single-duct high-velocity
air cooled < 65,000 Btu/hb All Split System 10.0 SEER
(cooling mode) ≥ 65,000 Btu/h and
11.2 IEER AHRI
Single Package 10.6 EER
Single Package 10.4 EER
Single Package 9.3 EER
(cooling mode) < 17,000 Btu/h All 86°F entering water 11.2 EER ISO 13256-1
< 65,000 Btu/h All 86°F entering water 12.0 EER
< 135,000 Btu/h All 86°F entering water 12.0 EER
(cooling mode) < 135,000 Btu/h All 59°F entering water 16.2 EER
All 77°F entering water 13.4 EER
Water-source water to water (cooling mode) < 135,000 Btu/h All 86°F entering water 10.6 EER ISO 13256-2
59°F entering water 16.3 EER
(cooling mode) < 135,000 Btu/h All 77°F entering fluid 12.1 EER
(heating mode) < 65,000 Btu/hb — Split System 7.7 HSPF AHRI
— Single Package 7.7 HSPF
(air cooled, heating mode) ≤ 30,000 Btu/hb
(cooling capacity) — Split System 7.4 HSPF
— Single Package 7.4 HSPF
(air cooled, heating mode) < 65,000 Btu/hb — Split System 6.8 HSPF
TABLE C403.2.3(2)—continued
EQUIPMENT TYPE SIZE CATEGORY HEATING SECTION TYPE SUB-CATEGORY OR
(heating mode) ≥ 65,000 Btu/h and
Outdoor Air 3.3 COP AHRI
17°F db/15°F wb
Outdoor Air 2.25 COP
Outdoor Air 3.2 COP
Outdoor Air 2.05 COP
(heating mode) < 135,000 Btu/h
(cooling capacity) — 68°F entering water 4.2 COP ISO 13256-1
(cooling capacity) — 50°F entering water 3.6 COP
(cooling capacity) — 32°F entering fluid 3.1 COP
(cooling capacity) — 68°F entering water 3.7 COP ISO 13256-2
— 50°F entering water 3.1 COP
(cooling capacity) — 32°F entering fluid 2.5 COP
ELECTRICALLY OPERATED PACKAGED TERMINAL AIR CONDITIONERS,
PACKAGED TERMINAL HEAT PUMPS, SINGLE-PACKAGE VERTICAL AIR CONDITIONERS,
SINGLE VERTICAL HEAT PUMPS, ROOM AIR CONDITIONERS AND ROOM AIR-CONDITIONER HEAT PUMPS
Before 10/08/2012 As of 10/08/2012
new construction All Capacities 95°F db outdoor air 12.5 - (0.213 × Cap/1000) EER 13.8 - (0.300 × Cap/1000) EER AHRI
replacementsb All Capacities 95°F db outdoor air 10.9 - (0.213 × Cap/1000) EER 10.9 - (0.213 × Cap/1000) EER
new construction All Capacities 95°F db outdoor air 12.3 - (0.213 × Cap/1000) EER 14.0 - (0.300 × Cap/1000) EER
replacementsb All Capacities 95°F db outdoor air 10.8 - (0.213 × Cap/1000) EER 10.8 - (0.213 × Cap/1000) EER
new construction All Capacities — 3.2 - (0.026 × Cap/1000) COP 3.2 - (0.026 × Cap/1000) COP
replacementsb All Capacities — 2.9 - (0.026 × Cap/1000) COP 2.9 - (0.026 × Cap/1000) COP
(cooling mode) < 65,000 Btu/h 95°F db/ 75°F wb
outdoor air 9.0 EER 9.0 EER AHRI 390
≥65,000 Btu/h and
< 135,000 Btu/h 95°F db/ 75°F wb
outdoor air 8.9 EER 8.9 EER
≥135,000 Btu/h and
< 240,000 Btu/h 95°F db/ 75°F wb
outdoor air 8.6 EER 8.6 EER
outdoor air 9.0 EER 9.0 EER
(heating mode) < 65,000 Btu/h 47°F db/ 43°F wb
outdoor air 3.0 COP 3.0 COP AHRI 390
< 135,000 Btu/h 47°F db/ 43°F wb
outdoor air 3.0 COP 3.0 COP
< 240,000 Btu/h 47°F db/ 75°F wb
outdoor air 2.9 COP 2.9 COP
TABLE C403.2.3(3)—continued
Room air conditioners, with louvered slides < 6,000 Btu/h — 9.7 SEER 9.7 SEER ANSI/AHAM
< 8,000 Btu/h — 9.7 EER 9.7 EER
< 14,000 Btu/h — 9.8 EER 9.8 EER
≥14,000 Btu/h and
< 20,000 Btu/h — 9.7 SEER 9.7 SEER
≥ 20,000 Btu/h — 8.5 EER 8.5 EER
Room air conditioners, without louvered slides < 8,000 Btu/h — 9.0 EER 9.0 EER
< 20,000 Btu/h — 8.5 EER 8.5 EER
Room air-conditioner heat pumps with
louvered sides < 20,000 Btu/h — 9.0 EER 9.0 EER
Room air-conditioner heat pumps without
louvered sides < 14,000 Btu/h — 8.5 EER 8.5 EER
≥ 14,000 Btu/h — 8.0 EER 8.0 EER
Room air conditioner casement only All capacities — 8.7 EER 8.7 EER
casement-slider All capacities — 9.5 EER 9.5 EER
“Cap” = The rated cooling capacity of the project in Btu/h. If the unit’s capacity is less than 7000 Btu/h, use 7000 Btu/h in the calculation. If the unit’s capacity is greater than 15,000 Btu/h, use 15,000 Btu/h in the calculations.
a. Chapter 6 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
b. Replacement unit shall be factory labeled as follows: “MANUFACTURED FOR REPLACEMENT APPLICATIONS ONLY: NOT TO BE INSTALLED IN NEW CONSTRUCTION PROJECTS.” Replacement efficiencies apply only to units with existing sleeves less than 16 inches (406 mm) in height and less than 42 inches (1067 mm) in width.
(INPUT) SUBCATEGORY OR
EFFICIENCYd,e TEST PROCEDUREa
gas fired < 225,000 Btu/h — 78% AFUE or
80%Etc DOE 10 CFR Part 430
oil fired < 225,000 Btu/h — 78% AFUE or
gas fired All capacities Maximum capacityb 80%Ec ANSI Z83.8
oil fired All capacities Maximum capacityb 80%Ec UL 731
RATING CONDITION SIZE CATEGORY (INPUT) MINIMUM EFFICIENCY TEST PROCEDURE
≤ 2,500,000 Btu/hb 80% Et 10CFR Part 431
> 2,500,00 Btu/ha 82% Ec
≤ 2,500,000 Btu/hb 82% Et 10 CFR Part 431
≤ 2,500,000 Btu/hb 79% Et 10CFR Part 431
≤ 2,500,000 Btu/hb 77% Et
≤ 2,500,000 Btu/hb 81% Et 10CFR Part 431
Ec = Combustion efficiency (100 percent less flue losses). Et = Thermal efficiency. See referenced standard document for detailed information.
a. These requirements apply to boilers with rated input of 8,000,000 Btu/h or less that are not packaged boilers and to all packaged boilers. Minimum efficiency requirements for boilers cover all capacities of packaged boilers.
b. Maximum capacity – minimum and maximum ratings as provided for and allowed by the unit’s controls.
c. Includes oil-fired (residual).
CONDENSING UNITS, ELECTRICALLY OPERATED
11.2 IPLV AHRI 365
WATER CHILLING PACKAGESa
EQUIPMENT TYPE SIZE
CATEGORY UNITS BEFORE 1/1/2010 AS OF 1/1/2010b TEST
PATH A PATH B
LOAD IPLV FULL
LOAD IPLV
Air-cooled chillers < 150 tons EER ≥9.562 ≥10.416 ≥ 9.562 ≥ 12.500 NA NA AHRI
≥150 tons EER ≥ 9.562 ≥ 12.750 NA NA
Air cooled without condenser, electrical
operated All
capacities EER ≥10.586 ≥ 11.782 Air-cooled chillers without condensers shall be rated with matching condensers and comply with the air-cooled chiller efficiency requirements
Water cooled, electrically operated,
reciprocating All
capacities kW/ton ≤ 0.837 ≤0.696 Reciprocating units shall comply with water cooled positive displacement efficiency requirements
Water cooled, electrically operated, positive displacement < 75 tons kW/ton ≤ 0.790 ≤ 0.676 ≤ 0.780 ≤ 0.630 ≤ 0.800 ≤ 0.600
< 150 tons kW/ton ≤ 0.775 ≤ 0.615 ≤ 0.790 ≤ 0.586
< 300 tons kW/ton ≤0.717 ≤ 0.627 ≤ 0.680 ≤ 0.580 ≤ 0.718 ≤ 0.540
≥ 300 tons kW/ton ≤ 0.639 ≤ 0.571 ≤0.620 ≤ 0.540 ≤0.639 ≤ 0.490
centrifugal < 150 tons kW/ton ≤ 0.703 ≤ 0.669 ≤ 0.634 ≤ 0.596 ≤ 0.639 ≤0.450
≥150 tons
< 300 tons kW/ton ≤0.634 ≤ 0.596
≥300 tons
< 600 tons kW/ton ≤ 0.576 ≤0.549 ≤ 0.576 ≤ 0.549 ≤ 0.600 ≤ 0.400
≥600 tons kW/ton ≤0.576 ≤ 0.549 ≤ 0.570 ≤ 0.539 ≤ 0.590 ≤ 0.400
Air cooled, absorption single effect All
capacities COP ≥0.600 NR ≥0.600 NR NA NA AHRI 560
Water cooled, absorption single effect All
capacities COP ≥0.700 NR ≥ 0.700 NR NA NA
Absorption double effect, indirect fired All
capacities COP ≥1.000 ≥ 1.050 ≥ 1.000 ≥1.050 NA NA
Absorption double effect, direct fired All
capacities COP ≥1.000 ≥ 1.000 ≥ 1.000 ≥1.000 NA NA
For SI: 1 ton = 3517 W, 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8.
NA = Not applicable, not to be used for compliance; NR = No requirement.
a. The centrifugal chiller equipment requirements, after adjustment in accordance with Section C403.2.3.1 or Section C403.2.3.2, do not apply to chillers used in low-temperature applications where the design leaving fluid temperature is less than 36°F. The requirements do not apply to positive displacement chillers with leaving fluid temperatures less than or equal to 32°F. The requirements do not apply to absorption chillers with design leaving fluid temperatures less than 40°F.
b. Compliance with this standard can be obtained by meeting the minimum requirements of Path A or B. However, both the full load and IPLV shall be met to fulfill the requirements of Path A or B.
c. Chapter 6 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
EQUIPMENT TYPEa TOTAL SYSTEM HEAT
REJECTION CAPACITY AT
RATED CONDITIONS SUBCATEGORY OR RATING CONDITION PERFORMANCE
REQUIREDb, c, d TEST PROCEDUREe, f
Propeller or axial fan open
circuit cooling towers All 95°F Entering Water
75°F Entering wb ≥ 38.2 gpm/hp CTI ATC-105 and
Centrifugal fan open circuit
cooling towers All 95°F Entering Water
Propeller or axial fan closed
circuit cooling towers All 102°F Entering Water
75°F Entering wb ≥14.0 gpm/hp CTI ATC-105S and
Centrifugal closed circuit
cooling towers All 102°F Entering Water
75°F Entering wb ≥ 7.0 gpm/hp CTI ATC-105S and
R-22 Test Fluid
15°F Subcooling
95°F Entering db ≥ 176,000 Btu/h•hp ARI 460
For SI: °C = [(°F)-32]/1.8, L/s • kW = (gpm/hp)/(11.83), COP = (Btu/h • hp)/(2550.7).
a. The efficiencies and test procedures for both open and closed circuit cooling towers are not applicable to hybrid cooling towers that contain a combination of wet and dry heat exchange sections.
b. For purposes of this table, open circuit cooling tower performance is defined as the water flow rating of the tower at the thermal rating condition listed in Table 403.2.3(8) divided by the fan nameplate rated motor power.
c. For purposes of this table, closed circuit cooling tower performance is defined as the water flow rating of the tower at the thermal rating condition listed in Table 403.2.3(8) divided by the sum of the fan nameplate rated motor power and the spray pump nameplate rated motor power.
d. For purposes of this table, air-cooled condenser performance is defined as the heat rejected from the refrigerant divided by the fan nameplate rated motor power.
e. Chapter 6 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
f. If a certification program exists for a covered product, and it includes provisions for verification and challenge of equipment efficiency ratings, then the product shall be listed in the certification program, or, if a certification program exists for a covered product, and it includes provisions for verification and challenge of equipment efficiency ratings, but the product is not listed in the existing certification program, the ratings shall be verified by an independent laboratory test report.
NR = No Requirement
Equipment not designed for operation at AHRI Standard 550/590 test conditions of 44°F (7°C) leaving chilled-water temperature and 85°F (29°C) entering condenser water temperature with 3 gpm/ton (0.054 I/s • kW) condenser water flow shall have maximum full-load kW/ton and NPLV ratings adjusted using Equations C4-3 and C4-4.
Adjusted minimum full-load COP ratings =
(Full-load COP from Table 6.8.1C of AHRI
Standard 550/590) × Kadj (Equation C4-3)
Adjusted minimum NPLV rating =
(IPLV from Table 6.8.1C of AHRI Standard
550/590) × Kadj (Equation C4-4)
A = 0.0000015318 × (LIFT)4 – 0.000202076 × (LIFT)3 + 0.0101800 × (LIFT)2 – 0.264958 × LIFT + 3.930196
B = 0.0027 × LvgEvap(°C) + 0.982
LIFT = LvgCond – LvgEvap
LvgCond = Full-load condenser leaving water temperature (°C)
LvgEvap = Full-load leaving evaporator temperature (°C)
SI units shall be used in the Kadj equation.
The adjusted full-load and NPLV values shall only be applicable for centrifugal chillers meeting all of the following full-load design ranges:
1. The leaving evaporator fluid temperature is not less than 36°F (2.2°C).
2. The leaving condenser fluid temperature is not greater than 115°F (46.1°C).
3. LIFT is not less than 20°F (11.1 °C) and not greater than 80°F (44.4°C).
Exception: Centrifugal chillers designed to operate outside of these ranges need not comply with this code.
Equipment with a leaving fluid temperature higher than 32°F (0°C), shall meet the requirements of Table C403.2.3(7) when tested or certified with water at standard rating conditions, in accordance with the referenced test procedure.
Each heating and cooling system shall be provided with thermostatic controls as specified in Section C403.2.4.1, C403.2.4.2, C403.2.4.3, C , C403.4.1, C403.4.2, C403.4.3 or C403.4.4.
1. The perimeter system includes at least one thermostatic control zone for each building exposure having exterior walls facing only one orientation (within +/-45 degrees) (0.8 rad) for more than 50 contiguous feet (15 240 mm); and
2. The perimeter system heating and cooling supply is controlled by a thermostats located within the zones served by the system.
Heat pumps having supplementary electric resistance heat shall have controls that, except during defrost, prevent supplementary heat operation where the heat pump can meet the heating load.
Automatic start controls shall be provided for each HVAC system. The controls shall be capable of automatically adjusting the daily start time of the HVAC system in order to bring each space to the desired occupied temperature immediately prior to scheduled occupancy.
Demand control ventilation (DCV) shall be provided for spaces larger than 500 square feet (50 m2) and with an average occupant load of 25 people per 1000 square feet (93 m2) of floor area (as established in Table 403.3 of the International Mechanical Code) and served by systems with one or more of the following:
1. Systems with energy recovery complying with Section C403.2.6.
Where the supply airflow rate of a fan system exceeds the values specified in Table C403.2.6, the system shall include an energy recovery system. The energy recovery system shall have the capability to provide a change in the enthalpy of the outdoor air supply of not less than 50 percent of the difference between the outdoor air and return air enthalpies, at design conditions. Where an air economizer is required, the energy recovery system shall include a bypass or controls which permit operation of the economizer as required by Section C403.4
2.2. Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2°F (1.1°C) above room setpoint, cooled to no cooler than 3°F (1.7°C) below room setpoint, no humidification added, and no simultaneous heating and cooling used for dehumidification control.
3. Systems serving spaces that are heated to less than 60°F (15.5°C) and are not cooled.
5. Heating energy recovery in Climate Zones 1 and 2.
6. Cooling energy recovery in Climate Zones 3C, 4C, 5B, 5C, 6B, 7 and 8.
7. Systems requiring dehumidification that employ energy recovery in series with the cooling coil.
8. Where the largest source of air exhausted at a single location at the building exterior is less than 75 percent of the design outdoor air flow rate.
9. Systems expected to operate less than 20 hours per week at the outdoor air percentage covered by Table C403.2.6
TABLE C403.2.6
ENERGY RECOVERY REQUIREMENT
CLIMATE ZONE PERCENT (%) OUTDOOR AIR AT FULL DESIGN AIRFLOW RATE
≥ 30% and < 40% ≥ 40% and < 50% ≥ 50% and < 60% ≥ 60% and < 70% ≥ 70% and < 80% ≥ 80%
DESIGN SUPPLY FAN AIRFLOW RATE (cfm)
3B, 3C, 4B, 4C, 5B NR NR NR NR ≥ 5000 ≥ 5000
1B, 2B, 5C NR NR ≥ 26000 ≥12000 ≥ 5000 ≥ 4000
6B ≥ 11000 ≥ 5500 ≥ 4500 ≥ 3500 ≥ 2500 ≥ 1500
1A, 2A, 3A, 4A, 5A, 6A ≥ 5500 ≥ 4500 ≥ 3500 ≥2000 ≥1000 > 0
7, 8 ≥ 2500 ≥1000 > 0 > 0 > 0 > 0
All supply and return air ducts and plenums shall be insulated with a minimum of R-6 insulation where located in unconditioned spaces and a minimum of R-8 insulation where located outside the building. Where located within a building envelope assembly, the duct or plenum shall be separated from the building exterior or unconditioned or exempt spaces by a minimum of R-8 insulation.
1. Where located within equipment.
2. Where the design temperature difference between the interior and exterior of the duct or plenum does not exceed 15°F (8°C).
Ductwork shall be constructed and erected in accordance with the International Mechanical Code.
All longitudinal and transverse joints, seams and connections of supply and return ducts operating at a static pressure less than or equal to 2 inches water gauge (w.g.) (500 Pa) shall be securely fastened and sealed with welds, gaskets, mastics (adhesives), mastic-plus-embedded-fabric systems or tapes installed in accordance with the manufacturer’s installation instructions. Pressure classifications specific to the duct system shall be clearly indicated on the construction documents in accordance with the International Mechanical Code.
Exception: Continuously welded and locking-type longitudinal joints and seams on ducts operating at static pressures less than 2 inches water gauge (w.g.) (500 Pa) pressure classification.
All ducts and plenums designed to operate at a static pressure greater than 2 inches water gauge (w.g.) (500 Pa) but less than 3 inches w.g. (750 Pa) shall be insulated and sealed in accordance with Section C403.2.7. Pressure classifications specific to the duct system shall be clearly indicated on the construction documents in accordance with the International Mechanical Code.
Ducts designed to operate at static pressures in excess of 3 inches water gauge (w.g.) (750 Pa) shall be insulated and sealed in accordance with Section C403.2.7. In addition, ducts and plenums shall be leak-tested in accordance with the SMACNA HVAC Air Duct Leakage Test Manual with the rate of air leakage (CL) less than or equal to 6.0 as determined in accordance with Equation C4-5.
CL = F/P0.65 (Equation C4-5)
All piping serving as part of a heating or cooling system shall be thermally insulated in accordance with Table C403.2.8.
2. Factory-installed piping within room fan-coils and unit ventilators tested and rated according to AHRI 440 (except that the sampling and variation provisions of Section 6.5 shall not apply) and AHRI 840, respectively.
3. Piping that conveys fluids that have a design operating temperature range between 60°F (15°C) and 105°F (41°C).
5. Strainers, control valves, and balancing valves associated with piping 1 inch (25 mm) or less in diameter.
6. Direct buried piping that conveys fluids at or below 60°F (15°C)
TABLE C403.2.8
MINIMUM PIPE INSULATION THICKNESS (thickness in inches)a
FLUID OPERATING
AND USAGE (°F) INSULATION CONDUCTIVITY NOMINAL PIPE OR TUBE SIZE (inches)
Btu • in./(h • ft2 • °F)b Mean Rating Temperature, °F < 1 1 to < 11/2 11/2 to < 4 4 to < 8 ≤ 8
> 350 0.32 – 0.34 250 4.5 5.0 5.0 5.0 5.0
251 – 350 0.29 – 0.32 200 3.0 4.0 4.5 4.5 4.5
201 – 250 0.27 – 0.30 150 2.5 2.5 2.5 3.0 3.0
141 – 200 0.25 – 0.29 125 1.5 1.5 2.0 2.0 2.0
105 – 140 0.21 – 0.28 100 1.0 1.0 1.5 1.5 1.5
40 – 60 0.21 – 0.27 75 0.5 0.5 1.0 1.0 1.0
< 40 0.20 – 0.26 75 0.5 1.0 1.0 1.0 1.5
a. For piping smaller than 11/2 inch (38 mm) and located in partitions within conditioned spaces, reduction of these thicknesses by 1 inch (25 mm) shall be permitted (before thickness adjustment required in footnote b) but not to a thickness less than 1 inch (25 mm).
b. For insulation outside the stated conductivity range, the minimum thickness (T) shall be determined as follows:
T = r {(1 + t / r )K / k – 1}
T = minimum insulation thickness,
r = actual outside radius of pipe,
t = insulation thickness listed in the table for applicable fluid temperature and pipe size,
K = conductivity of alternate material at mean rating temperature indicated for the applicable fluid temperature (Btu × in/h × ft2 × °F) and
k = the upper value of the conductivity range listed in the table for the applicable fluid temperature.
Piping insulation exposed to weather shall be protected from damage, including that due to sunlight, moisture, equipment maintenance and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Adhesives tape shall not be permitted.
Mechanical systems shall be commissioned and completed in accordance with Section C408.2.
Each HVAC system having a total fan system motor nameplate horsepower (hp) exceeding 5 horsepower (hp) (3.7 kW) shall meet the provisions of Sections C403.2.10.1 through C403.2.10.2.
Each HVAC system at fan system design conditions shall not exceed the allowable fan system motor nameplate hp (Option 1) or fan system bhp (Option 2) as shown in Table C403.2.10.1(1). This includes supply fans, return/relief fans, and fan-powered terminal units associated with systems providing heating or cooling capability. Single zone variable-air-volume systems shall comply with the constant volume fan power limitation.
Exception: The following fan systems are exempt from allowable fan floor horsepower requirement.
1. Hospital, vivarium and laboratory systems that utilize flow control devices on exhaust and/or return to maintain space pressure relationships necessary for occupant health and safety or environmental control shall be permitted to use variable volume fan power limitation.
TABLE C403.2.10.1(1)
LIMIT CONSTANT VOLUME VARIABLE VOLUME
Option 1: Fan system motor nameplate hp Allowable nameplate motor hp hp ≤ CFMS × 0.0011 hp ≤ CFMS × 0.0015
Option 2: Fan system bhp Allowable fan system bhp bhp ≤ CFMS × 0.00094 + A bhp ≤CFMS × 0.0013 + A
CFMS = The maximum design supply airflow rate to conditioned spaces served by the system in cubic feet per minute.
hp = The maximum combined motor nameplate horsepower.
Bhp = The maximum combined fan brake horsepower.
A = Sum of [PD × CFMD/4131]
For SI: 1 cfm = 0.471 L/s.
PD = Each applicable pressure drop adjustment from Table C403.2.10.1(2) in. w.c.
CFMD = The design airflow through each applicable device from Table C403.2.10.1(2) in cubic feet per minute.
For SI: 1 bhp = 735.5 W, 1 hp = 745.5 W.
TABLE C403.2.10.1(2)
Fully ducted return and/or exhaust air systems 0.5 inch w.c. (2.15 in w.c. for laboratory and vivarium systems)
Return and/or exhaust air flow control devices 0.5 inch w.c.
Exhaust filters, scrubbers, or other exhaust treatment. The pressure drop of device calculated at fan system design condition
Particulate filtration credit: MERV 9 thru 12 0.5 inch w.c.
Particulate filtration credit: MERV 13 thru 15 0.9 inch. w.c.
Particulate filtration credit: MERV 16 and greater and electronically enhanced filters Pressure drop calculated at 2x clean filter pressure drop at fan system design condition.
Carbon and other gas-phase air cleaners Clean filter pressure drop at fan system design condition.
Biosafety cabinet Pressure drop of device at fan system design condition.
Energy recovery device, other than coil runaround loop (2.2 × energy recovery effectiveness) – 0.5 inch w.c. for each airstream
Coil runaround loop 0.6 inch w.c. for each airstream
Evaporative humidifier/cooler in series with another cooling coil Pressure drop of device at fan system design conditions
Sound attenuation section 0.15 inch w.c.
Exhaust system serving fume hoods 0.35 inch w.c.
Laboratory and vivarium exhaust systems in high-rise buildings 0.25 inch w.c./100 feet of vertical duct exceeding 75 feet
w.c. = water column
For SI:1 inch w.c. = 249 Pa, 1 inch = 25.4 mm.
1. For fans less than 6 bhp (4413 W), where the first available motor larger than the brake horsepower has a nameplate rating within 50 percent of the bhp, selection of the next larger nameplate motor size is allowed.
2. For fans 6 bhp (4413 W) and larger, where the first available motor larger than the bhp has a nameplate rating within 30 percent of the bhp, selection of the next larger nameplate motor size is allowed.
Systems installed to provide heat outside a building shall be radiant systems.
Such heating systems shall be controlled by an occupancy sensing device or a timer switch, so that the system is automatically deenergized when no occupants are present.
This section applies to buildings served by unitary or packaged HVAC equipment listed in Tables C403.2.3(1) through C403.2.3(8), each serving one zone and controlled by a single thermostat in the zone served. It also applies to two-pipe heating systems serving one or more zones, where no cooling system is installed.
Each cooling system that has a fan shall include either an air or water economizer meeting the requirements of Sections C403.3.1.1 through C403.3.1.1.4.
Exception: Economizers are not required for the systems listed below.
1. Individual fan-cooling units with a supply capacity less than the minimum listed in Table C403.3.1(1).
2. Where more than 25 percent of the air designed to be supplied by the system is to spaces that are designed to be humidified above 35°F (1.7 °C) dew-point temperature to satisfy process needs.
3. Systems that serve residential spaces where the system capacity is less than five times the requirement listed in Table C403.3.1(1).
4. Systems expected to operate less than 20 hours per week.
6. Where the cooling efficiency meets or exceeds the efficiency requirements in Table C403.3.1(2).
TABLE C403.3.1(1)
2A, 2B, 3A, 3B, 3C, 4A, 4B, 4C, 5A, 5B, 5C, 6A, 6B, 7, 8 Economizers on all cooling
systems ≥33,000 Btu/ha
For SI:1 British thermal unit per hour = 0.2931 W.
a. The total capacity of all systems without economizers shall not exceed 300,000 Btu/h per building, or 20 percent of its air economizer capacity, whichever is greater.
TABLE C403.3.1(2)
ZONES COOLING EQUIPMENT PERFORMANCE
IMPROVEMENT (EER OR IPLV)
2B 10% Efficiency Improvement
3B 15% Efficiency Improvement
4B 20% Efficiency Improvement
Air economizers shall comply with Sections C403.3.1.1.1 through C403.3.1.1.4.
Exception: The use of mixed air temperature limit control shall be permitted for systems controlled from space temperature (such as single-zone systems).
Air economizers shall be capable of automatically reducing outdoor air intake to the design minimum outdoor air quantity when outdoor air intake will no longer reduce cooling energy usage. High-limit shutoff control types for specific climates shall be chosen from Table C403.3.1.1.3(1). High-limit shutoff control settings for these control types shall be those specified in Table C403.3.1.1.3(2).
TABLE C403.3.1.1.3(1)
HIGH-LIMIT SHUTOFF CONTROL OPTIONS FOR AIR ECONOMIZERS
CLIMATE ZONES ALLOWED CONTROL TYPES PROHIBITED CONTROL TYPES
1A, 2A, 3A, 4A Fixed dry bulb Differential dry bulb
All other climates Fixed dry bulb —
TABLE C403.3.1.1.3(2)
Fixed dry bulb 1B, 2B, 3B, 3C, 4B, 4C, 5B, 5C, 6B, 7, 8 TOA > 75°F Outdoor air temperature exceeds 75°F
5A, 6A, 7A TOA > 70°F Outdoor air temperature exceeds 70°F
All other zones TOA > 65°F Outdoor air temperature exceeds 65°F
Differential dry bulb 1B, 2B, 3B, 3C, 4B, 4C, 5A, 5B, 5C, 6A, 6B, 7, 8 TOA > TRA Outdoor air temperature exceeds
Fixed enthalpy All hOA > 28 Btu/lba Outdoor air enthalpy exceeds
28 Btu/lb of dry aira
Electronic Enthalpy All (TOA, RHOA) > A Outdoor air temperature/RH exceeds the “A“ setpoint curveb
Differential enthalpy All hOA > hRA Outdoor air enthalpy exceeds
return air enthalpy
Dew-point and dry bulb temperatures All DPOA> 55°F or TOA> 75°F Outdoor air dry bulb exceeds 75°F or outside dew point exceeds 55°F (65 gr/lb)
For SI: °C = (°F - 32) × 5/9, 1 Btu/lb = 2.33 kJ/kg.
a. At altitudes substantially different than sea level, the Fixed Enthalpy limit shall be set to the enthalpy value at 75°F and 50-percent relative humidity. As an example, at approximately 6,000 feet elevation the fixed enthalpy limit is approximately 30.7 Btu/lb.
b. Setpoint “A” corresponds to a curve on the psychometric chart that goes through a point at approximately 75°F and 40-percent relative humidity and is nearly parallel to dry-bulb lines at low humidity levels and nearly parallel to enthalpy lines at high humidity levels.
Systems shall be capable of relieving excess outdoor air during air economizer operation to prevent over-pressurizing the building. The relief air outlet shall be located to avoid recirculation into the building.
Hydronic systems of at least 300,000 Btu/h (87 930 W) design output capacity supplying heated and chilled water to comfort conditioning systems shall include controls that meet the requirements of Section C403.4.3.
This section applies to buildings served by HVAC equipment and systems not covered in Section C403.3.
Economizers shall comply with Sections C403.4.1.1 through C403.4.1.4.
Water economizer systems shall be capable of cooling supply air by indirect evaporation and providing up to 100 percent of the expected system cooling load at outdoor air temperatures of 50°F dry bulb (10°C dry bulb)/45°F wet bulb (7.2°C wet bulb) and below.
Exception: Systems in which a water economizer is used and where dehumidification requirements cannot be met using outdoor air temperatures of 50°F dry bulb (10°C dry bulb)/45°F wet bulb (7.2°C wet bulb) shall satisfy 100 percent of the expected system cooling load at 45°F dry bulb (7.2°C dry bulb)/40°F wet bulb (4.5°C wet bulb).
Precooling coils and water-to-water heat exchangers used as part of a water economizer system shall either have a water-side pressure drop of less than 15 feet (4572 mm) of water or a secondary loop shall be created so that the coil or heat exchanger pressure drop is not seen by the circulating pumps when the system is in the normal cooling (noneconomizer) mode.
Economizer systems shall be integrated with the mechanical cooling system and be capable of providing partial cooling even where additional mechanical cooling is required to meet the remainder of the cooling load.
1. Direct expansion systems that include controls that reduce the quantity of outdoor air required to prevent coil frosting at the lowest step of compressor unloading, provided this lowest step is no greater than 25 percent of the total system capacity.
2. Individual direct expansion units that have a rated cooling capacity less than 54,000 Btu/h (15 827 W) and use nonintegrated economizer controls that preclude simultaneous operation of the economizer and mechanical cooling.
HVAC system design and economizer controls shall be such that economizer operation does not increase the building heating energy use during normal operation.
Exception: Economizers on VAV systems that cause zone level heating to increase due to a reduction in supply air temperature.
Individual VAV fans with motors of 7.5 horsepower (5.6 kW) or greater shall be:
1. Driven by a mechanical or electrical variable speed drive;
2. Driven by a vane-axial fan with variable-pitch blades; or
3. The fan shall have controls or devices that will result in fan motor demand of no more than 30 percent of their design wattage at 50 percent of design airflow when static pressure set point equals one-third of the total design static pressure, based on manufacturer’s certified fan data.
Static pressure sensors used to control VAV fans shall be placed in a position such that the controller setpoint is no greater than one-third the total design fan static pressure, except for systems with zone reset control complying with Section C403.4.2.2. For sensors installed down-stream of major duct splits, at least one sensor shall be located on each major branch to ensure that static pressure can be maintained in each branch.
The heating of fluids that have been previously mechanically cooled and the cooling of fluids that have been previously mechanically heated shall be limited in accordance with Sections C403.4.3.1 through C403.4.3.3. Hydronic heating systems comprised of multiple-packaged boilers and designed to deliver conditioned water or steam into a common distribution system shall include automatic controls capable of sequencing operation of the boilers. Hydronic heating systems comprised of a single boiler and greater than 500,000 Btu/h (146 550 W) input design capacity shall include either a multistaged or modulating burner.
Hydronic heat pump systems shall comply with Sections C403.4.3.3.1 through C403.4.3.3.3.
Heat rejection equipment shall comply with Sections C403.4.3.3.2.1 and C403.4.3.3.2.2.
For Climate Zones 3 and 4:
For Climate Zones 5 through 8, if an open- or closed-circuit cooling tower is used, then a separate heat exchanger shall be provided to isolate the cooling tower from the heat pump loop, and heat loss shall be controlled by shutting down the circulation pump on the cooling tower loop and providing an automatic valve to stop the flow of fluid.
Exception: Factory-installed heat rejection devices within HVAC equipment tested and rated in accordance with Tables C403.2.3(6) and C403.2.3(7).
Sections C403.4.5.1 through C403.4.5.4 shall apply to complex mechanical systems serving multiple zones. Supply air systems serving multiple zones shall be VAV systems which, during periods of occupancy, are designed and capable of being controlled to reduce primary air supply to each zone to one of the following before reheating, recooling or mixing takes place:
Exception: The following define where individual zones or where entire air distribution systems are exempted from the requirement for VAV control:
6. Zones or supply air systems with thermostatic and humidistatic controls capable of operating in sequence the supply of heating and cooling energy to the zones and which are capable of preventing reheating, recooling, mixing or simultaneous supply of air that has been previously cooled, either mechanically or through the use of economizer systems, and air that has been previously mechanically heated.
Condenser heat recovery shall be installed for heating or reheating of service hot water provided the facility operates 24 hours a day, the total installed heat capacity of water-cooled systems exceeds 6,000,000 Btu/hr (1 758 600 W) of heat rejection, and the design service water heating load exceeds 1,000,000 Btu/h (293 100 W).
C403.4.7 Hot gas bypass limitation.
Cooling systems shall not use hot gas bypass or other evaporator pressure control systems unless the system is designed with multiple steps of unloading or continuous capacity modulation. The capacity of the hot gas bypass shall be limited as indicated in Table C
TABLE C403.4.7
RATED CAPACITY MAXIMUM HOT GAS BYPASS CAPACITY
≤ 240,000 Btu/h 50
> 240,000 Btu/h 25
Section C404 SERVICE WATER HEATING (Mandatory)
Water-heating equipment and hot water storage tanks shall meet the requirements of Table C404.2. The efficiency shall be verified through data furnished by the manufacturer or through certification under an approved certification program.
RATING CONDITION PERFORMANCE
REQUIREDa, b TEST
electric ≤ 12 kW Resistance 0.97 - 0.00 132V, EF DOE 10 CFR Part 430
> 12 kW Resistance 1.73V+ 155 SL, Btu/h ANSI Z21.10.3
≤ 250 volts Heat pump 0.93 - 0.00 132V, EF DOE 10 CFR Part 430
gas ≤ 75,000 Btu/h ≥ 20 gal 0.67 - 0.0019V, EF DOE 10 CFR Part 430
≤155,000 Btu/h < 4,000 Btu/h/gal ANSI Z21.10.3
> 155,000 Btu/h < 4,000 Btu/h/gal
gas > 50,000 Btu/h and
< 200,000 Btu/hc ≥ 4,000 (Btu/h)/gal
and < 2 gal 0.62 - 0.00 19V, EF DOE 10 CFR Part 430
≥200,000 Btu/h ≥ 4,000 Btu/h/gal
and < 10 gal 80% Et ANSI Z21.10.3
≥ 200,000 Btu/h ≥ 4,000 Btu/h/gal and
oil ≤ 105,000 Btu/h ≥ 20 gal 0.59 - 0.0019V, EF DOE 10 CFR Part 430
≥ 105,000 Btu/h < 4,000 Btu/h/gal ANSI Z21.10.3
oil ≤ 210,000 Btu/h ≥ 4,000 Btu/h/gal and
< 2 gal 0.59 - 0.0019V, EF DOE 10 CFR Part 430
> 210,000 Btu/h ≥4,000 Btu/h/gal and
< 10 gal 80% Et ANSI Z21.10.3
> 210,000 Btu/h ≥ 4,000 Btu/h/gal and
gas and oil ≥300,000 Btu/h and
< 12,500,000 Btu/h ≥ 4,000 Btu/h/gal and
gas ≥300,000 Btu/h and
oil > 300,000 Btu/h and
< 12,500,000 Btu/h > 4,000 Btu/h/gal and
gas and oil All — 78% Et ASHRAE 146
Heat pump pool heaters All — 4.0 COP AHRI 1160
Unfired storage tanks All — Minimum insulation
requirement R-12.5
(h • ft2 • °F)/Btu (none)
For automatic-circulating hot water and heat-traced systems, piping shall be insulated with not less than 1 inch (25 mm) of insulation having a conductivity not exceeding 0.27 Btu per inch/h × ft2 × °F (1.53 W per 25 mm/m2 × K). The first 8 feet (2438 mm) of piping in non-hot-water-supply temperature maintenance systems served by equipment without integral heat traps shall be insulated with 0.5 inch (12.7 mm) of material having a conductivity not exceeding 0.27 Btu per inch/h × ft2 × °F (1.53 W per 25 mm/m2 × K).
Exception: Heat-traced piping systems shall meet the insulation thickness requirements per the manufacturer’s installation instructions. Untraced piping within a heat traced system shall be insulated with not less than 1 inch (25 mm) of insulation having a conductivity not exceeding 0.27 Btu per inch/h × ft2 × °F (1.53 W per 25 mm/m2 × K).
Circulating hot water system pumps or heat trace shall be arranged to be turned off either automatically or manually when there is limited hot water demand. Ready access shall be provided to the operating controls.
Pools and inground permanently installed spas shall comply with Sections C404.7.1 through C404.7.3.
All heaters shall be equipped with a readily accessible on-off switch that is mounted outside of the heater to allow shutting off the heater without adjusting the thermostat setting. Gas-fired heaters shall not be equipped with constant burning pilot lights.
Time switches or other control method that can automatically turn off and on heaters and pumps according to a preset schedule shall be installed on all heaters and pumps. Heaters, pumps and motors that have built in timers shall be deemed in compliance with this requirement.
Heated pools and inground permanently installed spas shall be provided with a vapor-retardant cover.
Exception: A vapor-retardant cover is not required for pools deriving over 70 percent of the energy for heating from site-recovered energy, such as a heat pump or solar energy source computed over an operating season.
Section C405 Electrical Power and Lighting Systems (Mandatory)
This section covers lighting system controls, the connection of ballasts, the maximum lighting power for interior applications, electrical energy consumption, and minimum acceptable lighting equipment for exterior applications.
Exception: Dwelling units within commercial buildings shall not be required to comply with Sections C405.2 through C405.5 provided that not less than 75 percent of the permanently installed light fixtures, other than low-voltage lighting, shall be fitted for, and contain only, high efficacy lamps.
Lighting systems shall be provided with controls as specified in Sections C405.2.1, C405.2.2, C405.2.3 and C405.2.4.
All buildings shall include manual lighting controls that meet the requirements of Sections C405.2.1.1 and C405.2.1.2.
1. Areas designated as security or emergency areas that need to be continuously lighted.
Exception: Light reduction controls need not be provided in the following areas and spaces:
1. Areas that have only one luminaire, with rated power less than 100 watts.
3. Corridors, equipment rooms, storerooms, restrooms, public lobbies, electrical or mechanical rooms.
4. Sleeping unit (see Section C405.2.3).
6. Daylight spaces complying with Section C405.2.2.3.2.
Each area that is required to have a manual control shall also have controls that meet the requirements of Sections C405.2.2.1, C405.2.2.2 and C405.2.2.3.
Exception: Additional lighting controls need not be provided in the following spaces:
1. Sleeping units.
2. Spaces where patient care is directly provided.
4. Lighting intended for continuous operation.
Automatic time switch controls shall be installed to control lighting in all areas of the building.
1. Emergency egress lighting does not need to be controlled by an automatic time switch.
2. Lighting in spaces controlled by occupancy sensors does not need to be controlled by automatic time switch controls.
The automatic time switch control device shall include an override switching device that complies with the following:
1. The override switch shall be in a readily accessible location;
2. The override switch shall be located where the lights controlled by the switch are visible; or the switch shall provide a mechanism which announces the area controlled by the switch;
3. The override switch shall permit manual operation;
4. The override switch, when initiated, shall permit the controlled lighting to remain on for a maximum of 2 hours; and
5. Any individual override switch shall control the lighting for a maximum area of 5,000 square feet (465 m2).
Exception: Within malls, arcades, auditoriums, single tenant retail spaces, industrial facilities and arenas:
1. The time limit shall be permitted to exceed 2 hours provided the override switch is a captive key device; and
2. The area controlled by the override switch is permitted to exceed 5,000 square feet (465 m2), but shall not exceed 20,000 square feet (1860 m2).
Occupancy sensors shall be installed in all classrooms, conference/meeting rooms, employee lunch and break rooms, private offices, restrooms, storage rooms and janitorial closets, and other spaces 300 square feet (28 m2) or less enclosed by floor-to-ceiling height partitions. These automatic control devices shall be installed to automatically turn off lights within 30 minutes of all occupants leaving the space, and shall either be manual on or shall be controlled to automatically turn the lighting on to not more than 50 percent power.
Exception: Full automatic-on controls shall be permitted to control lighting in public corridors, stairways, restrooms, primary building entrance areas and lobbies, and areas where manual-on operation would endanger the safety or security of the room or building occupants
Daylight zones shall be designed such that lights in the daylight zone are controlled independently of general area lighting and are controlled in accordance with either Section C405.2.2.3.1 or Section C405.2.2.3.2. Each daylight control zone shall not exceed 2,500 square feet (232 m2). Contiguous daylight zones adjacent to vertical fenestration are allowed to be controlled by a single controlling device provided that they do not include zones facing more than two adjacent cardinal orientations (i.e., north, east, south, west). Daylight zones under skylights more than 15 feet (4572 mm) from the perimeter shall be controlled separately from daylight zones adjacent to vertical fenestration.
Exception: Daylight zones enclosed by walls or ceiling height partitions and containing two or fewer light fixtures are not required to have a separate switch for general area lighting.
Manual controls shall be installed in daylight zones unless automatic controls are installed in accordance with Section C405.2.2.3.2.
Set-point and other controls for calibrating the lighting control device shall be readily accessible.
Daylighting controls device shall be capable of automatically reducing the lighting power in response to available daylight by either one of the following methods:
1. Continuous dimming using dimming ballasts and daylight-sensing automatic controls that are capable of reducing the power of general lighting in the daylit zone continuously to less than 35 percent of rated power at maximum light output.
2. Stepped dimming using multi-level switching and daylight-sensing controls that are capable of reducing lighting power automatically. The system shall provide a minimum of two control channels per zone and be installed in a manner such that at least one control step is between 50 percent and 70 percent of design lighting power and another control step is no greater than 35 percent of design power.
Where multi-level lighting controls are required by this code, the general lighting in the daylight zone shall be separately controlled by at least one multi-level lighting control that reduces the lighting power in response to daylight available in the space. Where the daylit illuminance in the space is greater than the rated illuminance of the general lighting of daylight zones, the general lighting shall be automatically controlled so that its power draw is no greater than 35 percent of its rated power. The multi-level lighting control shall be located so that calibration and set point adjustment controls are readily accessible and separate from the light sensor.
1. Display and accent light shall be controlled by a dedicated control which is independent of the controls for other lighting within the room or space.
2. Lighting in cases used for display case purposes shall be controlled by a dedicated control which is independent of the controls for other lighting within the room or space.
3. Hotel and motel sleeping units and guest suites shall have a master control device at the main room entry that controls all permanently installed luminaires and switched receptacles.
4. Supplemental task lighting, including permanently installed under-shelf or under-cabinet lighting, shall have a control device integral to the luminaires or be controlled by a wall-mounted control device provided the control device is readily accessible.
5. Lighting for nonvisual applications, such as plant growth and food warming, shall be controlled by a dedicated control which is independent of the controls for other lighting within the room or space.
6. Lighting equipment that is for sale or for demonstrations in lighting education shall be controlled by a dedicated control which is independent of the controls for other lighting within the room or space.
1. Fluorescent luminaires equipped with one, three or odd-numbered lamp configurations, that are recess-mounted within 10 feet (3048 mm) center-to-center of each other.
2. Fluorescent luminaires equipped with one, three or any odd-numbered lamp configuration, that are pendant- or surface-mounted within 1 foot (305 mm) edge-to-edge of each other.
A building complies with this section if its total connected lighting power calculated under Section C405.5.1 is no greater than the interior lighting power calculated under Section C405.5.2.
The total connected interior lighting power (watts) shall be the sum of the watts of all interior lighting equipment as determined in accordance with Sections C405.5.1.1 through C405.5.1.4.
12. Lighting integral to both open and glass-enclosed refrigerator and freezer cases.
The total interior lighting power allowance (watts) is determined according to Table C405.5.2(1) using the Building Area Method, or Table C405.5.2(2) using the Space-by-Space Method, for all areas of the building covered in this permit. For the Building Area Method, the interior lighting power allowance is the floor area for each building area type listed in Table C405.5.2(1) times the value from Table C405.5.2(1) for that area. For the purposes of this method, an “area” shall be defined as all contiguous spaces that accommodate or are associated with a single building area type as listed in Table C405.5.2(1). Where this method is used to calculate the total interior lighting power for an entire building, each building area type shall be treated as a separate area. For the Space-by-Space Method, the interior lighting power allowance is determined by multiplying the floor area of each space times the value for the space type in Table C405.5.2(2) that most closely represents the proposed use of the space, and then summing the lighting power allowances for all spaces. Tradeoffs among spaces are permitted.
TABLE C405.5.2(1)
INTERIOR LIGHTING POWER ALLOWANCES:
BUILDING AREA METHOD
BUILDING AREA TYPE LPD (w/ft2)
Automotive facility 0.9
Convention center 1.2
Courthouse 1.2
Dining: bar lounge/leisure 1.3
Dining: cafeteria/fast food 1.4
Dining: family 1.6
Dormitory 1.0
Exercise center 1.0
Fire station 0.8
Gymnasium 1.1
Health care clinic 1.0
Hospital 1.2
Hotel 1.0
Library 1.3
Manufacturing facility 1.3
Motel 1.0
Motion picture theater 1.2
Multifamily 0.7
Museum 1.1
Office 0.9
Parking garage 0.3
Penetentiary 1.0
Performing arts theater 1.6
Police station 1.0
Post office 1.1
Religious building 1.3
Retail 1.4
School/university 1.2
Sports arena 1.1
Town hall 1.1
Warehouse 0.6
TABLE C405.5.2(2)
SPACE-BY-SPACE METHOD
COMMON SPACE-BY-SPACE TYPES LPD (w/ft2)
Atrium – First 40 feet in height 0.03 per ft. ht.
Atrium – Above 40 feet in height 0.02 per ft. ht.
Audience/seating area – permanent
For performing arts theater
For motion picture theater
Classroom/lecture/training
Conference/meeting/multipurpose
Corridor/transition
Bar/lounge/leisure dining
Dressing/fitting room performing arts theater 1.1
Electrical/mechanical 1.10
Food preparation 1.20
Laboratory for classrooms 1.3
Laboratory for medical/industrial/research 1.8
Lobby 1.10
Lobby for performing arts theater 3.3
Lobby for motion picture theater 1.0
Locker room 0.80
Lounge recreation 0.8
Office – enclosed 1.1
Office – open plan 1.0
Restroom 1.0
Sales area 1.6a
Stairway 0.70
Storage 0.8
Workshop 1.60
Courthouse/police station/penetentiary
Penitentiary audience seating
Penitentiary classroom
Penitentiary dining
BUILDING SPECIFIC SPACE-BY-SPACE TYPES
Automotive – service/repair 0.70
Bank/office – banking activity area 1.5
Dormitory living quarters 1.10
Gymnasium audience/seating
TABLE C405.5.2(2)—continued
Healthcare clinic/hospital
Corridors/transition
Public and staff lounge
Lounge/recreation
Laundry – washing
Highway lodging dining
Highway lodging guest rooms
Card file and cataloguing
Detailed manufacturing
Extra high bay (> 50-foot floor-ceiling height)
High bay (25- – 50-foot floor-ceiling height)
Low bay (< 25-foot floor-ceiling height)
Parking garage – garage areas 0.2
Audience/seating area
Sorting area 0.9
Worship pulpit/choir
Dressing/fitting area
Mall concourse
BUILDING SPECIFIC SPACE-BY-SPACE TYPES LPD (w/ft2)
Court sports area – Class 4
Court sports area – Class 3
Court sports area – Class 2
Court sports area – Class 1
Ring sports area
Air/train/bus baggage area
Airport concourse
Terminal – ticket counter
Fine material storage
Medium/bulky material
For SI: 1 foot = 304.8 mm, 1 watt per square foot = 11 W/m2.
a. Where lighting equipment is specified to be installed to highlight specific merchandise in addition to lighting equipment specified for general lighting and is switched or dimmed on circuits different from the circuits for general lighting, the smaller of the actual wattage of the lighting equipment installed specifically for merchandise, or additional lighting power as determined below shall be added to the interior lighting power determined in accordance with this line item.
Additional Interior Lighting Power Allowance = 500 watts + (Retail Area 1 × 0.6 W/ft2) + (Retail Area 2 × 0.6 W/ft2) + (Retail Area 3 × 1.4 W/ft2) + (Retail Area 4 × 2.5 W/ft2).
Retail Area 1
The floor area for all products not listed in Retail Area 2, 3 or 4.
Retail Area 2
The floor area used for the sale of vehicles, sporting goods and small electronics.
Retail Area 3
The floor area used for the sale of furniture, clothing, cosmetics and artwork.
Retail Area 4
The floor area used for the sale of jewelry, crystal and china.
Where the power for exterior lighting is supplied through the energy service to the building, all exterior lighting, other than low-voltage landscape lighting, shall comply with Sections C405.6.1 and C405.6.2.
All exterior building grounds luminaires that operate at greater than 100 watts shall contain lamps having a minimum efficacy of 60 lumens per watt unless the luminaire is controlled by a motion sensor or qualifies for one of the exceptions under Section C405.6.2.
The total exterior lighting power allowance for all exterior building applications is the sum of the base site allowance plus the individual allowances for areas that are to be illuminated and are permitted in Table C405.6.2(2) for the applicable lighting zone. Tradeoffs are allowed only among exterior lighting applications listed in Table C405.6.2(2), Tradable Surfaces section. The lighting zone for the building exterior is determined from Table C405.6.2(1) unless otherwise specified by the local jurisdiction. Exterior lighting for all applications (except those included in the exceptions to Section C405.6.2) shall comply with the requirements of Section C405.6.1.
Exception: Lighting used for the following exterior applications is exempt where equipped with a control device independent of the control of the nonexempt lighting:
TABLE C405.6.2(1)
1 Developed areas of national parks, state parks, forest
land, and rural areas
2 Areas predominantly consisting of residential zoning,
neighborhood business districts, light industrial with
limited nighttime use and residential mixed use areas
3 All other areas
4 High-activity commercial districts in major metropolitan
areas as designated by the local land use planning
TABLE C405.6.2(2)
Base Site Allowance (Base allowance is usable in tradable or nontradable surfaces.) 500 W 600 W 750 W 1300 W
Tradable Surfaces (Lighting power densities for uncovered parking areas, building grounds, building entrances and exits, canopies and overhangs and outdoor sales areas are tradable.) Uncovered Parking Areas
Parking areas and drives 0.04 W/ft2 0.06 W/ft2 0.10 W/ft2 0.13 W/ft2
10 feet wide 0.7 W/linear foot 0.7 W/linear foot 0.8 W/linear foot 1.0 W/linear foot
Walkways 10 feet wide
or greater, plaza areas
special feature areas 0.14 W/ft2 0.14 W/ft2 0.16 W/ft2 0.2 W/ft2
Stairways 0.75 W/ft2 1.0 W/ft2 1.0 W/ft2 1.0 W/ft2
Pedestrian tunnels 0.15 W/ft2 0.15 W/ft2 0.2 W/ft2 0.3 W/ft2
Main entries 20 W/linear foot
of door width 20 W/linear foot
of door width 30 W/linear foot
Other doors 20 W/linear foot
Entry canopies 0.25 W/ft2 0.25 W/ft2 0.4 W/ft2 0.4 W/ft2
Free-standing and
attached 0.6 W/ft2 0.6 W/ft2 0.8 W/ft2 1.0 W/ft2
Open areas (including
vehicle sales lots) 0.25 W/ft2 0.25 W/ft2 0.5 W/ft2 0.7 W/ft2
Street frontage for
vehicle sales lots in
addition to “open area“
allowance No allowance 10 W/linear foot 10 W/linear foot 30 W/linear foot
Nontradable Surfaces (Lighting power density calculations for the following applications can be used only for the specific application and cannot be traded between surfaces or with other exterior lighting. The following allowances are in addition to any allowance otherwise permitted in the “Tradable Surfaces“ section of this table.) Building facades No allowance 0.1 W/ft2 for each
illuminated wall or
surface or 2.5 W/linear foot for each illuminated
wall or surface length 0.15 W/ft2 for each
surface or 3.75 W/linear
foot for each illuminated
wall or surface length 0.2 W/ft2 for each
surface or 5.0 W/linear
wall or surface length
machines and night
depositories 270 W per location plus
90 W per additional
ATM per location 270 W per location plus
ATM per location
Entrances and gatehouse
inspection stations at
guarded facilities 0.75 W/ft2 of covered
and uncovered area 0.75 W/ft2 of covered
and uncovered area 0.75 W/ft2 of covered and uncovered area
Loading areas for law
enforcement, fire,
ambulance and other
vehicles 0.5 W/ft2 of covered and uncovered area 0.5 W/ft2 of covered and uncovered area 0.5 W/ft2 of covered and uncovered area 0.5 W/ft2 of covered
Drive-up windows/doors 400 W per drive-through 400 W per drive-through 400 W per drive-through 400 W per drive-through
Parking near 24-hour
retail entrances 800 W per main entry 800 W per main entry 800 W per main entry 800 W per main entry
Section C406 Additional Efficiency Package Options
Buildings shall comply with at least one of the following:
1. Efficient HVAC Performance in accordance with Section C406.2.
2. Efficient Lighting System in accordance with Section C406.3.
3. On-Site Supply of Renewable Energy in accordance with Section C406.4.
Individual tenant spaces shall comply with either Section C406.2 or Section C406.3 unless documentation can be provided that demonstrates compliance with Section C406.4 for the entire building
Equipment shall meet the minimum efficiency requirements of Tables C406.2.(1) through C406.2(7) in addition to the requirements in Section C403 . This section shall only be used where the equipment efficiencies in Tables C406.2.(1) through C406.2(7) are greater than the equipment efficiencies listed in Table C403.2.3(1) through 403.2.3(7) for the equipment type.
TABLE C406.2(1)
UNITARY AIR CONDITIONERS AND CONDENSING UNITS, ELECTRICALLY OPERATED, EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE SIZE CATEGORY SUBCATEGORY OR
RATING CONDITION MINIMUM EFFICIENCYa
1 - 5 CLIMATE ZONES
air cooled < 65,000 Btu/h Split system 15.0 SEER
12.5 EER 14 SEER
Single package 15.0 SEER
12.0 EER 14.0 SEER
11.6 EER
≥ 65,000 Btuh/h and
< 240,000 Btu/h Split system and single package 12.0 EERb
12.54 IEERb 11.5 EERb
12.0 IEERb
≥ 240,000 Btu/h and
< 760,000 Btu/h Split system and single package 10.8 EERb
11.3 IEERb 10.5 EERb
11.0 IEERb
≥ 760,000 Btu/h — 10.2 EERb
10.7 IEERb 9.7 EERb
10.2 IEERb
Air conditioners, water
and evaporatively cooled — Split system and single package 14.0 EER 14.0 EER
a. IEERs are only applicable to equipment with capacity modulation.
b. Deduct 0.2 from the required EERs and IPLVs for units with a heating section other than electric resistance heat.
TABLE C406.2(2)
UNITARY AND APPLIED HEAT PUMPS, ELECTRICALLY OPERATED, EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE SIZE CATEGORY SUBCATEGORY OR RATING
CONDITION MINIMUM EFFICIENCYa
(Cooling mode) < 65,000 Btu/h Split system 15.0 SEER,
12.5 EER 14.0 SEER,
Single package 15.0 SEER,
< 240,000 Btu/h Split system and single package 12.0 SEER,
12.4 EER 11.5 EERb,
≥ 240,000 Btu/h Split system and single package 12.0 SEER,
12.4 EER 10.5 EERb,
10.5 IEERb
(Cooling mode) < 135,000 Btu/h 85°F entering water 14.0 EER 14.0 EER
(Heating mode) < 65,000 Btu/h
(Cooling capacity) Split system 9.0 HSPF 8.5 HSPF
Single package 8.5 HSPF 8.0 HSPF
(Cooling capacity) 47°F db/43°F wb outdoor air 3.4 COP 3.4 COP
17°F db/15°F wb outdoor air 2.4 COP 2.4 COP
(Cooling capacity) 47°F db/43°F wb outdoor air 3.2 COP 3.2 COP
77°F db/15°F wb outdoor air 2.1 COP 2.1 COP
(Cooling capacity) 70°F entering water 4.6 COP 4.6 COP
For SI: °C = [(°F) - 32] / 1.8, 1 British thermal unit per hour = 0.2931 W.
a. IEERs and Part load rating conditions are only applicable to equipment with capacity modulation.
TABLE C406.2(3)
PACKAGED TERMINAL AIR CONDITIONERS AND PACKAGED TERMINALHEAT PUMPS
EQUIPMENT TYPE SIZE CATEGORY MINIMUM EFFICIENCY
(cooling mode) < 7,000 Btu/h 11.9 EER
7,000 Btu/h and < 10,000 Btu/h 11.3 EER
10,000 Btu/h and ≤13,000 Btu/h 10.7 EER
> 13,000 Btu/h 9.5 EER
TABLE C406.2(4)
WARM AIR DUCT FURNACES AND UNIT HEATERS, EFFICIENCY REQUIREMENTS
RATING CONDITION MINIMUM EFFICIENCY TEST PROCEDURE
gas fireda < 225,000 Btu/h — For Climate Zones 1 and 2 NR DOE 10 CFR Part 430
For Climate Zones 3 and 4
90 AFUE or 90 Ect
For Climate Zones 4 – 8
92 AFUE or 92 Ect
≥225,000 Btu/h Maximum capacity 90% Ebc ANSI Z21.47
oil fireda < 225,000 Btu/h — For Climate Zones 1 and 2 NR DOE 10 CFR Part 430
For Climate Zones 3 – 8
85 AFUE or 85 Ect
≥225,000 Btu/h Maximum capacity 85% Ebt UL 727
Warm air duct furnaces, gas fireda All capacities Maximum capacity 90% Ec ANSI Z83.8
Warm air unit heaters, gas fired All capacities Maximum capacity 90% Ec ANSI Z83.8
Warm air unit heaters, oil fired All capacities Maximum capacity 90% Ec UL 731
Et = Thermal efficiency. Ec = Combustion efficiency (100 percent less flue losses).
a. Efficient furnace fan: Fossil fuel furnaces in climate zones 3 to 8 shall have a furnace electricity ratio not greater than 2 percent and shall include a manufacturer’s designation of the furnace electricity ratio.
b. Units shall also include an IID (intermittent ignition device), have jacket losses not exceeding 0.75 percent of the input rating, and have either power venting or a flue damper. A vent damper is an acceptable alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space.
c. Where there are two ratings for units not covered by NAECA (3-phase power or cooling capacity greater than or equal to 65,000 Btu/h [19 kW]), units shall be permitted to comply with either rating.
TABLE C406.2(5)
BOILER, EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE FUEL SIZE CATEGORY TEST PROCEEDURE MINIMUM
Steam Gas < 300,000 Btu/h DOE 10 CFR Part 430 83% AFUE
> 300,000 Btu/h and > 2.5 m Btu/h DOE 10 CFR Part 431 81% Et
>2.5 m Btu/h 82% Ec
Oil < 300,000 Btu/h DOE 10 CFR Part 430 85% AFUE
> 300,000 Btu/h and > 2.5 m Btu/h DOE 10 CFR Part 431 83% Et
>2.5 m Btu/h 84% Ec
Hot water Gas < 300,000 Btu/h DOE 10 CFR Part 430 97% AFUE
> 300,000 Btu/h and > 2.5 m Btu/h DOE 10 CFR Part 431 97% Et
>2.5 m Btu/h 94% Ec
Oil < 300,000 Btu/h DOE 10 CFR Part 430 90% AFUE
> 300,000 Btu/h and > 2.5 m Btu/h DOE 10 CFR Part 431 88% Et
>2.5 m Btu/h 87% Ec
Et = Thermal efficiency. Ec= Combustion efficiency (100 percent less flue losses).
TABLE C406.2(6)
CHILLERS—EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE SIZE CATEGORY UNITS MINIMUM EFFICIENCYC (I-P) Test
Procedureb
Path A Path Bc
Full Load IPLV Full Load IPLV
Air-cooled chillers with condenser,
electrically operated < 150 tons EER 10.000 12.500 NA NA AHRI 550/
≥150 tons EER 10.000 12.750 NA NA
Air-cooled without condenser,
electrical operated All capacities EER Condenserless units shall be rated with matched con-
densers AHRI 550
/590f
Water-cooled, electrically oper-
ated, positive displacement (recip-
rocating) All capacities kw/ton Reciprocating units required to comply with water
cooled positive displacement requirements AHRI 550/
Water-cooled electrically oper-
ated, positive displacement < 75 tons kw/ton 0.780 0.630 0.800 0.600 AHRI 550/
≥ 75 tons and < 150 tons kw/ton 0.775 0.615 0.790 0.586
≥150 tons and < 300 tons kw/ton 0.680 0.580 0.718 0.540
≥ 300 tons kw/ton 0.620 0.540 0.639 0.490
ated, centrifugald < 150 tons kw/ton 0.634 0.596 0.639 0.450 AHRI 550/
≥150 tons and < 300 tons kw/ton 0.634 0.596 0.639 0.450
≥300 tons and < 600 tons kw/ton 0.576 0.549 0.600 0.400
≥ 600 tons kw/ton 0.570 0.539 0.590 0.400
Air-cooled absorption single
effecte All capacities COP 0.600 NR NA NA AHRI 560
Water-cooled absorption single
effecte All capacities COP 0.700 NR NA NA
Absorption double effect indirect-
fired All capacities COP 1.000 1.050 NA NA
Absorption double effect direct
fired All capacities COP 1.000 1.000 NA NA
For SI: 1 Ton = 3516 W.
NA = Not applicable and cannot be used for compliance. NR = No minimum requirements.
a. Compliance with this standard can be obtained by meeting the minimum requirements of Path A or Path B. However both the full load and IPLV shall be met to fulfill the requirements of Path A and Path B.
b. Chapter 6 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
c. Path B is intended for applications with significant operating time at part load. All Path B machines shall be equipped with demand limiting capable controls.
d. The chiller equipment requirements do not apply for chillers used in low-temperature applications where the design leaving fluid temperature is greater than 40°F.
e. Only allowed to be used in heat recovery applications.
f. Packages that are not designed for operation at ARI Standard 550/590 test conditions (and, thus, cannot be tested to meet the requirements of Table C-3) of 44°F leaving chilled-water temperature and 85°F entering condenser-water temperature with 3 gpm/ton condenser-water flow shall have maximum full-load kW/ton and NPLV ratings adjusted using the following equation:
Adjusted maximum full load kW/ton rating = (full load kW/ton from Table C-3)/Kadj
Adjusted maximum NPLV rating
(IPLV from Table C-3)/Kadj
6.174722 – 0.303668(X) + 0.00629466(X)2 – 0.000045780(X)3
DTstd+ LIFT (°F)
DTstd
[(24 + (full load kW/ton from Table C-3) × 6.83)]/flow (°F)
condenser-water flow (gpm) / cooling full load capacity (tons)
CEWT – CLWT (°F)
full load entering condenser-water temperature (°F)
full load leaving chilled-water temperature (°F)
Minimum leaving chilled-water temperature: 38°F
Maximum condenser entering water temperature: 102°F
Condenser-water flow: 1 to 6 gpm/ton
X≥39°F and ≤ 60°F
TABLE C406.2(7)
ABSORPTION CHILLERS—EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE MINIMUM EFFICIENCY
FULL LOAD COP (IPLV)
Air cooled, single effect 0.60, allowed only in
Water cooled, single effect 0.70, allowed only in
Double effect – direct fired 1.0 (1.05 )
Double effect – indirect fired 1.20
Whole building lighting power density (Watts/sf) shall comply with the requirements of Section C406.3.1.
TABLE C406.3
REDUCED INTERIOR LIGHTING POWER
BUILDING AREA TYPEa LPD (w/ft2)
Automotive facility 0.82
Convention center 1.08
Courthouse 1.05
Dining: bar lounge/leisure 0.99
Dining: cafeteria/fast food 0.90
Dining: family 0.89
Dormitory 0.61
Exercise center 0.88
Fire station 0.71
Gymnasium 1.0
Health care clinic 0.87
Hospital 1.10
Library 1.18
Manufacturing facility 1.11
Hotel/motel 0.88
Motion picture theater 0.83
Museum 1.06
Multifamily 0.60
Office 0.90/0.85b
Performing arts theater 1.39
Police station 0.96
Post office 0.87
Religious building 1.05
Retail 1.4/1.3b
School/ university 0.99
Sports arena 0.78
Town hall 0.92
Transportation 0.77
Warehousec 0.6
b. First LPD value applies if no less than 30 percent of conditioned floor area is in daylight zones. Automatic daylighting controls shall be installed in daylight zones and shall meet the requirements of Section C405.2.2.3. In all other cases, second LPD value applies.
c. No less than 70 percent of the floor area shall be in the daylight zone. Automatic daylighting controls shall be installed in daylight zones and shall meet the requirements of Section C405.2.2.3.
The total interior lighting power (watts) of the building shall be determined by using the reduced whole building interior lighting power in Table C406.3 times the floor area for the building types.
Total minimum ratings of on-site renewable energy systems shall comply with one of the following:
1. Provide not less than 1.75 Btu (1850 W), or not less than 0.50 watts per square foot (5.4 W/m2) of conditioned floor area.
2. Provide not less than 3 percent of the energy used within the building for building mechanical and service water heating equipment and lighting regulated in this chapter.
Section C407 Total Building Performance
Compliance with this section requires that the criteria of Sections C402.4, C403.2, C404 and C405 be met.
2. An inspection checklist documenting the building component characteristics of the proposed design as listed in Table C407.5.1(1). The inspection checklist shall show the estimated annual energy cost for both the standard reference design and the proposed design;
2. Thermal zoning diagrams consisting of floor plans showing the thermal zoning scheme for standard reference design and proposed design;
5. A certification signed by the builder providing the building component characteristics of the proposed design as given in Table C407.5.1(1).
The standard reference design and proposed design shall be configured and analyzed as specified by Table C407.5.1(1). Table C407.5.1(1) shall include by reference all notes contained in Table C402.2.
TABLE C407.5.1(1)
CHARACTERISTICS STANDARD REFERENCE DESIGN PROPOSED DESIGN
Space use classification Same as proposed The space use classification shall be chosen in
accordance with Table C405.5.2 for all areas of the
building covered by this permit. Where the space use
classification for a building is not known, the building
shall be categorized as an office building.
Roofs Type: Insulation entirely above deck As proposed
U-factor: from Table C402.1.2 As proposed
Solar absorptance: 0.75 As proposed
Emittance: 0.90 As proposed
Walls, above-grade Type: Mass wall if proposed wall is mass; otherwise steel-framed wall As proposed
Walls, below-grade Type: Mass wall As proposed
U-Factor: from Table C402.1.2 with insulation layer on interior side of walls As proposed
Floors, above-grade Type: joist/framed floor As proposed
Floors, slab-on-grade Type: Unheated As proposed
F-factor: from Table C402.1.2 As proposed
Doors Type: Swinging As proposed
Area: Same as proposed As proposed
U-factor: from Table C402.2 As proposed
1. The proposed glazing area; where the proposed glazing area is less
than 40 percent of above-grade wall area.
2. 40 percent of above-grade wall area; where the proposed glazing area
is 40 percent or more of the above-grade wall area. As proposed
U-factor: from Table C402.3 As proposed
SHGC: from Table C402.3 except that for climates with no requirement
(NR) SHGC = 0.40 shall be used As proposed
External shading and PF: None As proposed
Skylights Area
1. The proposed skylight area; where the proposed skylight area is
less than 3 percent of gross area of roof assembly.
2. 3 percent of gross area of roof assembly; where the proposed
skylight area is 3 percent or more of gross area of roof assembly As proposed
SHGC: from Table C402.3 except that for climates with no
requirement (NR) SHGC = 0.40 shall be used. As proposed
Lighting, interior The interior lighting power shall be determined in accordance with
Section C405.5.2. Where the occupancy of the building is not known,
the lighting power density shall be 1.0 Watt per square foot (10.73 W/
m2) based on the categorization of buildings with unknown space
classification as offices. As proposed
Lighting, exterior The lighting power shall be determined in accordance with Table
C405.6.2(2). Areas and dimensions of tradable and nontradable
surfaces shall be the same as proposed. As proposed
TABLE C407.5.1(1)—continued
Internal gains Same as proposed Receptacle, motor and process loads shall be
modeled and estimated based on the space use
classification. All end-use load components within
and associated with the building shall be modeled to
exhaust fans, parking garage ventilation fans,
exterior building lighting, swimming pool heaters
and pumps, elevators, escalators, refrigeration
equipment and cooking equipment.
Schedules Same as proposed Operating schedules shall include hourly profiles
for daily operation and shall account for variations
between weekdays, weekends, holidays and any
seasonal operation. Schedules shall model the time-
dependent variations in occupancy, illumination,
receptacle loads, thermostat settings, mechanical
ventilation, HVAC equipment availability, service
hot water usage and any process loads. The
schedules shall be typical of the proposed building
type as determined by the designer and approved
by the jurisdiction.
Mechanical ventilation Same as proposed As proposed, in accordance with Section C403.2.5.
Heating systems Fuel type: same as proposed design As proposed
Equipment typea: from Tables C407.5.1(2) and C407.5.1(3) As proposed
Efficiency: from Tables C403.2.3(4) and C403.2.3(5) As proposed
Capacityb: sized proportionally to the capacities in the proposed design
based on sizing runs, and shall be established such that no smaller
number of unmet heating load hours and no larger heating capacity
safety factors are provided than in the proposed design. As proposed
Cooling systems Fuel type: same as proposed design As proposed
Equipment typec: from Tables C407.5.1(2) and C407.5.1(3) As proposed
Efficiency: from Tables C403.2.3(1), C403.2.3(2) and C403.2.3(3) As proposed
number of unmet cooling load hours and no larger cooling capacity
Economizerd: same as proposed, in accordance with Section C . As proposed
Service water heating Fuel type: same as proposed As proposed
Efficiency: from Table C404.2 As proposed
Capacity: same as proposed As proposed
Where no service water hot water system exists or is specified in the
proposed design, no service hot water heating shall be modeled.
d. If an economizer is required in accordance with Table C403.3.1(1), and if no economizer exists or is specified in the proposed design, then a supply air economizer shall be provided in accordance with Section C403.4.1.
TABLE C407.5.1(2)
SOURCEa HEATING SYSTEM
CLASSIFICATIONb STANDARD REFERENCE DESIGN HVC SYSTEM TYPEc
Single-zone Residential
System Single-zone Nonresidential
System All Other
Water/ground Electric resistance System 5 System 5 System 1
Heat pump System 6 System 6 System 6
Fossil fuel System 7 System 7 System 2
Air/none Electric resistance System 8 System 9 System 3
Heat pump System 8 System 9 System 3
Fossil fuel System 10 System 11 System 4
TABLE C407.5.1(3)
SYSTEM NO. SYSTEM TYPE FAN CONTROL COOLING TYPE HEATING TYPE
1 Variable air volume with parallel fan-powered boxesa VAVd Chilled watere Electric resistance
2 Variable air volume with reheatb VAVd Chilled watere Hot water fossil fuel boilerf
3 Packaged variable air volume with parallel fan-powered boxesa VAVd Direct expansionc Electric resistance
4 Packaged variable air volume with reheatb VAVd Direct expansionc Hot water fossil fuel boilerf
5 Two-pipe fan coil Constant volumei Chilled watere Electric resistance
6 Water-source heat pump Constant volumei Direct expansionc Electric heat pump and boilerg
7 Four-pipe fan coil Constant volumei Chilled watere Hot water fossil fuel boilerf
8 Packaged terminal heat pump Constant volumei Direct expansionc Electric heat pumph
9 Packaged rooftop heat pump Constant volumei Direct expansionc Electric heat pumph
10 Packaged terminal air conditioner Constant volumei Direct expansion Hot water fossil fuel boilerf
11 Packaged rooftop air conditioner Constant volumei Direct expansion Fossil fuel furnace
a. VAV with parallel boxes: Fans in parallel VAV fan-powered boxes shall be sized for 50 percent of the peak design flow rate and shall be modeled with 0.35 W/cfm fan power. Minimum volume setpoints for fan-powered boxes shall be equal to the minimum rate for the space required for ventilation consistent with Section C403.4.5, Exception 5. Supply air temperature setpoint shall be constant at the design condition.
d. VAV: Constant volume can be modeled if the system qualifies for Exception 1, Section C403.4.5. When the proposed design system has a supply, return or relief fan motor 25 horsepower (hp) or larger, the corresponding fan in the VAV system of the standard reference design shall be modeled assuming a variable speed drive. For smaller fans, a forward-curved centrifugal fan with inlet vanes shall be modeled. If the proposed design''s system has a direct digital control system at the zone level, static pressure setpoint reset based on zone requirements in accordance with SectionC403.4.2 shall be modeled.
e. Chilled water: For systems using purchased chilled water, the chillers are not explicitly modeled and chilled water costs shall be based as determined in Sections C407.3 and C407.5.2. Otherwise, the standard reference design’s chiller plant shall be modeled with chillers having the number as indicated in Table C407.5.1(4) as a function of standard reference building chiller plant load and type as indicated in Table C407.5.1(5) as a function of individual chiller load. Where chiller fuel source is mixed, the system in the standard reference design shall have chillers with the same fuel types and with capacities having the same proportional capacity as the proposed design’s chillers for each fuel type. Chilled water supply temperature shall be modeled at 44°F design supply temperature and 56°F return temperature. Piping losses shall not be modeled in either building model. Chilled water supply water temperature shall be reset in accordance with Section C403.4.3.4. Pump system power for each pumping system shall be the same as the proposed design; if the proposed design has no chilled water pumps, the standard reference design pump power shall be 22 W/gpm (equal to a pump operating against a 75-foot head, 65-percent combined impeller and motor efficiency). The chilled water system shall be modeled as primary-only variable flow with flow maintained at the design rate through each chiller using a bypass. Chilled water pumps shall be modeled as riding the pump curve or with variable-speed drives when required in Section C403.4.3.4. The heat rejection device shall be an axial fan cooling tower with two-speed fans if required in Section C403.4.4. Condenser water design supply temperature shall be 85°F or 10°F approach to design wet-bulb temperature, whichever is lower, with a design temperature rise of 10°F. The tower shall be controlled to maintain a 70°F leaving water temperature where weather permits, floating up to leaving water temperature at design conditions. Pump system power for each pumping system shall be the same as the proposed design; if the proposed design has no condenser water pumps, the standard reference design pump power shall be 19 W/gpm (equal to a pump operating against a 60-foot head, 60-percent combined impeller and motor efficiency). Each chiller shall be modeled with separate condenser water and chilled water pumps interlocked to operate with the associated chiller.
f. Fossil fuel boiler: For systems using purchased hot water or steam, the boilers are not explicitly modeled and hot water or steam costs shall be based on actual utility rates. Otherwise, the boiler plant shall use the same fuel as the proposed design and shall be natural draft. The standard reference design boiler plant shall be modeled with a single boiler if the standard reference design plant load is 600,000 Btu/h and less and with two equally sized boilers for plant capacities exceeding 600,000 Btu/h. Boilers shall be staged as required by the load. Hot water supply temperature shall be modeled at 180°F design supply temperature and 130°F return temperature. Piping losses shall not be modeled in either building model. Hot water supply water temperature shall be reset in accordance with Section C403.4.3.4. Pump system power for each pumping system shall be the same as the proposed design; if the proposed design has no hot water pumps, the standard reference design pump power shall be 19 W/gpm (equal to a pump operating against a 60-foot head, 60-percent combined impeller and motor efficiency). The hot water system shall be modeled as primary only with continuous variable flow. Hot water pumps shall be modeled as riding the pump curve or with variable speed drives when required by Section C403.4.3.4.
g. Electric heat pump and boiler: Water-source heat pumps shall be connected to a common heat pump water loop controlled to maintain temperatures between 60°F and 90°F. Heat rejection from the loop shall be provided by an axial fan closed-circuit evaporative fluid cooler with two-speed fans if required in Section C403.4.2. Heat addition to the loop shall be provided by a boiler that uses the same fuel as the proposed design and shall be natural draft. If no boilers exist in the proposed design, the standard reference building boilers shall be fossil fuel. The standard reference design boiler plant shall be modeled with a single boiler if the standard reference design plant load is 600,000 Btu/h or less and with two equally sized boilers for plant capacities exceeding 600,000 Btu/h. Boilers shall be staged as required by the load. Piping losses shall not be modeled in either building model. Pump system power shall be the same as the proposed design; if the proposed design has no pumps, the standard reference design pump power shall be 22 W/gpm, which is equal to a pump operating against a 75-foot head, with a 65-percent combined impeller and motor efficiency. Loop flow shall be variable with flow shutoff at each heat pump when its compressor cycles off as required by Section C403.4.3.3. Loop pumps shall be modeled as riding the pump curve or with variable speed drives when required by Section C403.4.3.4.
TABLE C407.5.1(4)
TOTAL CHILLER PLANT CAPACITY NUMBER OF CHILLERS
≤ 300 tons 1
> 300 tons, < 600 tons 2, sized equally
≥ 600 tons 2 minimum, with chillers added so that no chiller is larger than 800 tons, all sized equally
TABLE C407.5.1(5)
INDIVIDUAL CHILLER PLANT CAPACITY ELECTRIC-CHILLER TYPE FOSSIL FUEL CHILLER TYPE
≤ 100 tons Reciprocating Single-effect absorption, direct fired
> 100 tons,
< 300 tons Screw Double-effect absorption, direct fired
≥ 300 tons Centrifugal Double-effect absorption, direct fired
The standard reference design and proposed design shall be analyzed using identical thermal blocks as specified in Section C407.5.2.1, C407.5.2.2 or C407.5.2.3 .
2. Building operation for a full calendar year (8,760 hours).
3. Climate data for a full calendar year (8,760 hours) and shall reflect approved coincident hourly data for temperature, solar radiation, humidity and wind speed for the building location.
9. Printed code official inspection checklist listing each of the proposed design component characteristics from Table C407.5.1(1) determined by the analysis to provide compliance, along with their respective performance ratings (e.g., R-value, U-factor, SHGC, HSPF, AFUE, SEER, EF, etc.).
Performance analysis tools meeting the applicable subsections of Section C407 and tested according to ASHRAE Standard 140 shall be permitted to be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The code official shall be permitted to approve tools for a specified application or limited scope.
Where calculations require input values not specified by Sections C402 , C403 , C404 and C405 , those input values shall be taken from an approved source.
Section C408 System Commissioning
This section covers the commissioning of the building mechanical systems in Section C403 and electrical power and lighting systems in Section C405 .
Prior to passing the final mechanical inspection, the registered design professional shall provide evidence of mechanical systems commissioning and completion in accordance the provisions of this section.
Construction document notes shall clearly indicate provisions for commissioning and completion requirements in accordance with this section and are permitted to refer to specifications for further requirements. Copies of all documentation shall be given to the owner and made available to the code official upon request in accordance with Sections C408.2.4 and C408.2.5.
Exception: The following systems are exempt from the commissioning requirements:
1. Mechanical systems in buildings where the total mechanical equipment capacity is less than 480,000 Btu/h (140 690 W) cooling capacity and 600,000 Btu/h (175 860 W) heating capacity.
2. Systems included in Section C403.3 that serve dwelling units and sleeping units in hotels, motels, boarding houses or similar units.
A commissioning plan shall be developed by a registered design professional or approved agency and shall include the following items:
1. A narrative description of the activities that will be accomplished during each phase of commissioning, including the personnel intended to accomplish each of the activities.
2. A listing of the specific equipment, appliances or systems to be tested and a description of the tests to be performed.
3. Functions to be tested, including, but not limited to calibrations and economizer controls.
4. Conditions under which the test will be performed. At a minimum, testing shall affirm winter and summer design conditions and full outside air conditions.
5. Measurable criteria for performance.
HVAC systems shall be balanced in accordance with generally accepted engineering standards. Air and water flow rates shall be measured and adjusted to deliver final flow rates within the tolerances provided in the product specifications. Test and balance activities shall include air system and hydronic system balancing.
Each supply air outlet and zone terminal device shall be equipped with means for air balancing in accordance with the requirements of Chapter 6 of the International Mechanical Code. Discharge dampers are prohibited on constant volume fans and variable volume fans with motors 10 hp (18.6 kW) and larger. Air systems shall be balanced in a manner to first minimize throttling losses then, for fans with system power of greater than 1 hp (0.74 kW), fan speed shall be adjusted to meet design flow conditions.
Exception: Fans with fan motors of 1 hp (0.74 kW) or less.
Individual hydronic heating and cooling coils shall be equipped with means for balancing and measuring flow. Hydronic systems shall be proportionately balanced in a manner to first minimize throttling losses, then the pump impeller shall be trimmed or pump speed shall be adjusted to meet design flow conditions. Each hydronic system shall have either the capability to measure pressure across the pump, or test ports at each side of each pump.
1. Pumps with pump motors of 5 hp (3.7 kW) or less.
2. Where throttling results in no greater than five percent of the nameplate horsepower draw above that required if the impeller were trimmed.
Functional performance testing specified in Sections C408.2.3.1 through C408.2.3.3 shall be conducted.
Equipment functional performance testing shall demonstrate the installation and operation of components, systems, and system-to-system interfacing relationships in accordance with approved plans and specifications such that operation, function, and maintenance serviceability for each of the commissioned systems is confirmed. Testing shall include all modes and sequence of operation, including under full-load, part-load and the following emergency conditions:
1. All modes as described in the sequence of operation;
Exception: Unitary or packaged HVAC equipment listed in Tables C403.2.3(1) through C403.2.3(3) that do not require supply air economizers.
HVAC control systems shall be tested to document that control devices, components, equipment, and systems are calibrated, adjusted and operate in accordance with approved plans and specifications. Sequences of operation shall be functionally tested to document they operate in accordance with approved plans and specifications.
Air economizers shall undergo a functional test to determine that they operate in accordance with manufacturer’s specifications.
A preliminary report of commissioning test procedures and results shall be completed and certified by the registered design professional or approved agency and provided to the building owner. The report shall be identified as “Preliminary Commissioning Report” and shall identify:
1. Itemization of deficiencies found during testing required by this section that have not been corrected at the time of report preparation.
2. Deferred tests that cannot be performed at the time of report preparation because of climatic conditions.
3. Climatic conditions required for performance of the deferred tests.
Buildings, or portions thereof, shall not pass the final mechanical inspection until such time as the code official has received a letter of transmittal from the building owner acknowledging that the building owner has received the Preliminary Commissioning Report.
The code official shall be permitted to require that a copy of the Preliminary Commissioning Report be made available for review by the code official.
The construction documents shall specify that the documents described in this section be provided to the building owner within 90 days of the date of receipt of the certificate of occupancy.
Construction documents shall include the location and performance data on each piece of equipment.
An operating and maintenance manual shall be provided and include all of the following:
1. Submittal data stating equipment size and selected options for each piece of equipment requiring maintenance.
2. Manufacturer’s operation manuals and maintenance manuals for each piece of equipment requiring maintenance, except equipment not furnished as part of the project. Required routine maintenance actions shall be clearly identified.
3. Name and address of at least one service agency.
4. HVAC controls system maintenance and calibration information, including wiring diagrams, schematics, and control sequence descriptions. Desired or field-determined setpoints shall be permanently recorded on control drawings at control devices or, for digital control systems, in system programming instructions.
5. A narrative of how each system is intended to operate, including recommended setpoints.
A written report describing the activities and measurements completed in accordance with Section C408.2.2.
A report of test procedures and results identified as “Final Commissioning Report” shall be delivered to the building owner and shall include:
1. Results of functional performance tests.
2. Disposition of deficiencies found during testing, including details of corrective measures used or proposed.
3. Functional performance test procedures used during the commissioning process including measurable criteria for test acceptance, provided herein for repeatability.
Exception: Deferred tests which cannot be performed at the time of report preparation due to climatic conditions.
C408.3 Lighting system functional testing.
Controls for automatic lighting systems shall comply with Section C408.3. C408.3.1 Functional testing.
Testing shall ensure that control hardware and software are calibrated, adjusted, programmed and in proper working condition in accordance with the construction documents and manufacturer’s installation instructions. The construction documents shall state the party who will conduct the required functional testing. Where required by the code official, an approved party independent from the design or construction of the project shall be responsible for the functional testing and shall provide documentation to the code official certifying that the installed lighting controls meet the provisions of Section C405 .
Where occupant sensors, time switches, programmable schedule controls, photosensors or daylighting controls are installed, the following procedures shall be performed:
1. Confirm that the placement, sensitivity and time-out adjustments for occupant sensors yield acceptable performance.
2. Confirm that the time switches and programmable schedule controls are programmed to turn the lights off.
3. Confirm that the placement and sensitivity adjustments for photosensor controls reduce electric light based on the amount of usable daylight in the space as specified.