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-40802 - Section C408.2-Mechanical systems commissioning

Current through Register Vol. 24-14, July 15, 2024
C408.2
Mechanical systems
			 commissioning.
Mechanical equipment and controls subject to Section C403
			 shall be included in the commissioning process required by Section C408.1. The
			 commissioning process shall minimally include all energy code requirements for
			 which the code states that equipment or controls shall "be capable of" or
			 "configured to" perform specific functions.
EXCEPTION:
Mechanical systems are exempt from the commissioning
							 process where the installed total mechanical equipment capacity is less than
							 240,000 Btu/h cooling capacity and less than 300,000 Btu/h heating
							 capacity.
C408.2.1
Reserved.
C408.2.2
Systems adjusting and balancing.
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 project specifications. Test and balance activities
			 shall include air system and hydronic system balancing.
C408.2.2.1
Air systems
			 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 used for air system balancing 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.
C408.2.2.2
Hydronic systems
			 balancing.
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.
EXCEPTION:
The following equipment is not required to be
							 equipped with means for balancing or measuring flow:
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.
C408.2.3
System testing.
Functional performance testing shall demonstrate the components, systems, and
			 system-to-system interfacing relationships are installed and operate in
			 accordance with approved construction documents. Testing shall include the
sequence of operation
, and be conducted under full-load,
			 part-load and the following conditions:
1. All
			 modes as described in the
sequence of operation
;
2. Redundant or
automatic
back-up mode;
3. Performance of
			 alarms; and
4. Mode of operation
			 upon a loss of power and restoration of power.