Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial › Section 51-11C-40332 - Section C403.3.2-HVAC equipment performance requirements

Current through Register Vol. 24-14, July 15, 2024
C403.3.2
HVAC
			 equipment performance requirements.
Equipment shall meet the minimum
			 efficiency requirements of Tables C403.3.2(1) through C403.3.2 (16) when tested
			 and rated in accordance with the applicable test procedure. Plate-type
			 liquid-to-liquid heat exchangers shall meet the minimum requirements of AHRI
			 400. The efficiency shall be verified through certification and listed 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.
C403.3.2.1
Gas-fired and oil-fired forced air furnaces.
Forced air furnaces
			 with input ratings [GREATER THAN EQUAL TO] 225,000 Btu/h (65 kW) and all unit
			 heaters shall also have an intermittent ignition or interrupted device (IID),
			 and have either mechanical draft (including power venting) or a flue damper. A
			 vent damper is an acceptable alternative to a flue damper for furnaces where
			 combustion air is drawn from the conditioned space. All furnaces with input
			 ratings [GREATER THAN EQUAL TO] 225,000 Btu/h (65 kW), including electric
			 furnaces, that are not located within the conditioned space shall have jacket
			 losses not exceeding 0.75 percent of the input rating.
C403.3.2.2
Hydronic and multiple-zone
			 HVAC system controls and equipment.
Hydronic and multiple-zone HVAC
			 system controls and equipment shall comply with this section.
For buildings with a total equipment cooling capacity of 300
				tons and above, the equipment shall comply with one of the following:
1. No one unit shall have a cooling capacity
			 of more than 2/3 of the total installed cooling equipment capacity;
2. The equipment shall have a variable speed
			 drive; or
3. The equipment shall
			 have multiple compressors.
C403.3.2.3
Chillers.
Chilled
			 water plants and buildings with more than 500 tons total capacity shall not
			 have more than 100 tons provided by air-cooled chillers.
EXCEPTIONS:
1. Where the designer demonstrates that the water
						  quality at the building site fails to meet manufacturer's specifications for
						  the use of water-cooled equipment.
2. Air-cooled chillers with minimum efficiencies at
						  least 10 percent higher than those listed in Table C403.3.2(3).
3. Replacement of existing air-cooled chiller
						  equipment.
4. Air-to-water heat pump units that are configured to
						  provide both heating and cooling and that are rated in accordance with AHRI
						  550/590.
C403.3.2.4
Water-cooled centrifugal
			 chilling packages.
Equipment not designed for operation at AHRI Standard 550/590
				test conditions of 44.00°F (6.67°C) leaving and 54.00°F
				(12.22°C) entering chilled-water temperatures and with 85.00°F
				(29.44°C) entering and 94.30°F (34.61°C) leaving condenser-fluid
				temperatures, shall have maximum full-load kW/ton (FL) and
part-load
ratings adjusted using the following equations.
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The FLadj and
				PLVadj values are applicable only for centrifugal
				chillers meeting all of the following full-load design ranges:
* 36.00°F [LESS THAN EQUAL TO]
LvgEvap
[LESS THAN EQUAL TO] 60.00°F
*
LvgCond
[LESS THAN
				EQUAL TO] 115.00°F
* 20.00°F [LESS THAN EQUAL TO]
LIFT
[LESS
				THAN EQUAL TO] 80.00°F
Manufacturers shall calculate the
FLadj
and
PLVadj
before determining whether to
				label the chiller. Centrifugal chillers designed to operate outside of these
				ranges are not covered by this code.
C403.3.2.5
Positive displacement (air-
			 and water-cooled) chilling packages.
Equipment with a leaving fluid
			 temperature higher than 32°F (0°C) and water-cooled positive
			 displacement chilling packages with a condenser leaving fluid temperature below
			 115°F (46°C) shall meet the requirements the tables in Section C403.3.2
			 when tested or certified with water at standard rating conditions, in
			 accordance with the referenced test procedure.
C403.3.2.6
Packaged and split system
			 electric heating and cooling equipment.
Packaged and split system
			 equipment providing both electric heating and cooling, and cooling-only
			 equipment with electric heat in the main supply duct before VAV boxes, in each
			 case with a total cooling capacity greater than 6,000 Btu/h shall be a heat
			 pump configured to operate in heat pump mode whenever the outdoor air
			 temperature is above 25°F (-3.9°C) and the unit is not in defrost. The
			 unit shall have reverse-cycle demand defrost.
EXCEPTION:
Unstaffed equipment shelters or cabinets used solely
						  for personal wireless service facilities.
C403.3.2.7
Humidification.
If an
			 air economizer is required on a cooling system for which humidification
			 equipment is to be provided to maintain minimum indoor humidity levels, then
			 the humidifier shall be of the adiabatic type (direct evaporative media or fog
			 atomization type).
EXCEPTIONS:
1. Health care facilities licensed by the state where
						  chapter 246-320 or 246-330 WAC requires steam injection humidifiers in duct
						  work downstream of final filters.
2. Systems with water economizer.
3. 100 percent outside air systems with no provisions
						  for air recirculation to the central supply fan.
4. Nonadiabatic humidifiers cumulatively serving no
						  more than 10 percent of a building's air economizer capacity as measured in
						  cfm. This refers to the system cfm serving rooms with stand alone or duct
						  mounted humidifiers.