5.3003.11 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)
5.3003.11a
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

5.3003.11b
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

5.3003.11c
Penetrations

Penetrations for control wiring will be sealed with a durable sealant (e.g., caulk, silicone, foam) at both the interior (e.g., floor, sheetrock) and exterior air barriers (e.g., bottom liner, side walls)

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

5.3003.11d
Thermostat location

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

Mounting location for air leakage and conductance that would affect the thermostat operation (e.g., marriage walls, exterior walls) will be accessed

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

Ensure controls operate as designed

5.3003.11e
Blower speed

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

Ensure equipment has correct air flow

5.3003.11f
Thermostat selection: heat pump

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

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

5.3003.11g
Heat pump: supplementary heat

Supplementary heat lockout on air-to-air heat pumps will be set to the economical balance point

ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org 3 Manual S Residential Equipment Selection will be referenced for set points when using different types of heat pumps

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

5.3003.11h
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 ambient compressor lockout will be disabled

ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org 3 Manual S Residential Equipment Selection will be referenced for low ambient compressor lockout when using different types of heat pumps

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

5.3003.11i
Heat pump: outside temperature sensor

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

Ensure equipment operates as designed

5.3003.11j
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

5.3003.11k
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

5.3003.11l
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

5.3003.11m
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

5.3003.11n
Ventilation control

Ventilation controls will be connected to operational control system, as originally designed in the factory

Powered ventilation system alarm will be set to "on;" controls will be reset to factory settings

Ensure proper operation of the mechanically dampered and powered ventilation systems

5.3003.11o
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
  • Educate property manager/occupant about fan on/auto or vent/auto operations
  • Educate the property manager/occupant about ventilation, as it applies to controls
  • Instruct the property manager/occupant to never leave the fan set to "on" or "vent" in humid climates
  • Educate property manager/occupant about possible moisture problems when thermostat is set low for extended periods of time during the summer

Ensure equipment and controls operate as designed

Provide comfort throughout house

Ensure property manager/occupant knows how to operate the system

Minimize moisture problems