5.3003.9 Heating and Cooling Controls

Topic: 
Forced Air
Subtopic: 
System Assessment and Maintenance
Desired Outcome: 
Heating and cooling controls installed and set properly
TitleSpecification(s)Objective(s)
5.3003.9a
Removal of mercury- based thermostats

Mercury based thermostat will be removed safely and disposed of in accordance with EPA EPA U.S. Environmental Protection Agency, www.epa.gov regulations

Protect workers and occupants from injury

Protect environment from damage

5.3003.9b
Removal of existing controls

Existing controls will be removed in accordance with EPA EPA U.S. Environmental Protection Agency, www.epa.gov lead-safe work rules

Protect workers and occupants from injury

Protect environment from damage

5.3003.9c
Penetrations

Penetrations for control wiring will be sealed with a durable sealant (e.g., caulk, silicone, foam)

Ensure controls operate as designed

Minimize infiltration Infiltration The uncontrolled passage of outside air into a building through unintended leaks in the building envelope and exfiltration Exfiltration The uncontrolled passage of inside air out of a building through unintended leaks in the building envelope from house

5.3003.9d
Thermostat location

Thermostats will be installed to reflect the temperature of the zone in which they are installed

Thermostats will not be exposed to extreme temperatures, radiant heat sources, and drafts

Ensure controls operate as designed

5.3003.9e
Blower speed

Blower speed will be set for equipment in accordance with manufacturer specifications

Ensure equipment has correct air flow

5.3003.9f
Thermostat selection: heat pump

A thermostat with equipment supplementary heat lockout that can interface with an outside temperature sensor will be selected

Ensure supplementary heater operation is prevented when the heat pump is capable of meeting the load

5.3003.9g
Heat pump: supplementary heat

Supplementary heat will be used on air-to-air heat pumps with conditions that allow for a balance point of less than 30°F

Supplementary heat lockout will be installed and set to manufacturer specifications

Ensure supplementary heater operation is prevented when the heat pump is capable of meeting the load

5.3003.9h
Heat pump: low ambient compressor lockout

For air-to-air heat pumps, low ambient compressor lockout will be set to 0°F outdoor temperature or to manufacturer specifications

Ensure supplementary heater operation is prevented when the heat pump is capable of meeting the load

5.3003.9i
Heat pump: outside temperature sensor

An outdoor temperature sensor will be installed in accordance with manufacturer specifications

Ensure equipment operates as designed

5.3003.9j
Heat pump: supplementary heat wiring

Supplementary heat will be wired onto second-stage heating terminal in accordance with manufacturer specifications

Do not operate supplementary heat in stage one heating

5.3003.9k
Thermostat: installer programming

The installer options will be set to match the thermostat to the equipment and control board settings

Ensure equipment operates as designed

5.3003.9l
Time delay settings

Time delay for equipment will be set in accordance with manufacturer specifications and as appropriate for the climate zone (e.g., no time delay for hot humid climates)

Maximize transfer of heat without adversely affecting indoor humidity levels

5.3003.9m
Humidistat: location

Humidistat will be installed to reflect humidity of the zone in which it is installed

Humidistat will be installed in a dry location

Ensure controls operate as designed

5.3003.9n
Occupant education

Occupants will be educated on proper use of thermostat including:

  • Proper use of setbacks for air conditioners and heat pumps
  • Allowing occupant comfort to determine setback for combustion heating appliances
  • Using emergency heat appropriately

Ensure equipment and controls operate as designed

Provide comfort throughout house