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// CODE SNIPPET

C403.4.3.3.2 Heat Rejection

Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.4 Heating and Cooling System Controls (Mandatory) > C403.4.3 Hydronic Systems Controls > C403.4.3.3 Hydronic (Water Loop) Heat Pump Systems > C403.4.3.3.2 Heat Rejection
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The following shall apply to hydronic water loop heat pump systems in Climate Zones 3 through 8:
  1. Where a closed-circuit cooling tower is used directly in the heat pump loop, either an automatic valve shall be installed to bypass the flow of water around the closed-circuit cooling tower, except for any flow necessary for freeze protection, or low-leakage positive-closure dampers shall be provided.
  2. Where an open-circuit cooling tower is used directly in the heat pump loop, an automatic valve shall be installed to bypass all heat pump water flow around the open-circuit cooling tower.
  3. Where an open-circuit cooling tower is used in conjunction with a separate heat exchanger to isolate the open-circuit cooling tower from the heat pump loop, heat loss shall be controlled by shutting down the circulation pump on the cooling tower loop.
Exception: Where it can be demonstrated that a heat pump system will be required to reject heat throughout the year.

Related Code Sections


C403.4.2.3.2 [CE] Commercial Energy Efficiency, Heat Rejection
Heat rejection equipment shall comply with Sections C403.4.2.3.2.1 and C403.4.2.3.2.2. Exception: Where it can be demonstrated that a heat pump ...
Energy Conservation Code 2015 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.4 Hydronic and Multiple-Zone HVAC Systems Controls and Equipment. (Prescriptive) > C403.4.2 Hydronic Systems Controls > C403.4.2.3 Hydronic (Water Loop) Heat Pump Systems > C403.4.2.3.2 Heat Rejection
C403.4.3.3.2 [CE] Commercial Energy Efficiency, Heat Rejection
pump system will be required to reject heat throughout the year ...
Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.4 Heating and Cooling System Controls (Mandatory) > C403.4.3 Hydronic Systems Controls > C403.4.3.3 Hydronic (Water Loop) Heat Pump Systems > C403.4.3.3.2 Heat Rejection
C403.4.3.3.2 [CE] Commercial Energy Efficiency, Heat Rejection
be demonstrated that a heat pump system will be required to reject heat throughout the year ...
Energy Conservation Code 2021 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.4 Heating and Cooling System Controls > C403.4.3 Hydronic Systems Controls > C403.4.3.3 Hydronic (Water Loop) Heat Pump Systems > C403.4.3.3.2 Heat Rejection
C403.9.2 [CE] Commercial Energy Efficiency, Multiple-Cell Heat Rejection Equipment
Multiple-cell heat rejection equipment with variable speed fan drives shall be controlled to operate the maximum number of fans allowed that comply ...
Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.9 Heat Rejection Equipment > C403.9.2 Multiple-Cell Heat Rejection Equipment
C403.10.5 [CE] Commercial Energy Efficiency, Heat Recovery for Service Water Heating
, the total installed heat capacity of water-cooled systems exceeds 6,000,000 Btu/hr (1758 kW) of heat rejection, and the design service water heating load ...
Energy Conservation Code 2021 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.10 Heat Rejection Equipment > C403.10.5 Heat Recovery for Service Water Heating
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