Thermostat Replacement

Detail ID
5.0101.1
Topic
Forced Air
SubTopic
Controls
Desired Outcome

Properly functioning and more efficient system

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing

Specifications

  • SF
  • MH
  • MF
Specification Objective

Verify that sufficient number of thermostat wires is available to meet the needs of the replacement unit and the existing system

Sufficient wiring exists

  • SF
  • MH
  • MF
Specification Objective

Select a double-setback programmable thermostat that allows for full functionality of the installed system (supplementary heat, emergency heat, fan only, ventilation control, etc.)

Versatile programmable thermostat that correctly matches system

  • SF
  • MH
  • MF
Specification Objective

Install thermostat where it accurately reflects the temperature and humidity of the zone which it controls (i.e., not exposed to extreme temperatures, radiant heat sources, warm/cold walls, or drafts)

Temperature and humidity measurements accurate for space controlled

  • SF
  • MH
  • MF
Specification Objective

Connect supplementary heat to second-stage heating terminal in accordance with manufacturer specifications

Install and connect outdoor temperature sensor that is compatible with the thermostat in accordance with manufacturer specifications

Calculate and select an optimum thermal balance point for supplementary heat operation in accordance with ANSI/ACCA Manual S and manufacturer specifications

Prevent supplementary heat operation when heat pump can meet heating load

  • SF
  • MH
  • MF
Specification Objective

Program the thermostat to match the equipment and control board settings per manufacturer specifications

Set time delay for fan start in accordance with manufacturer specifications and as appropriate for the climate zone (e.g., no time delay for hot humid climates, longer time delay for cold climates)

Program the thermostat setbacks to a schedule that accommodates the occupant and reduces overall run time

Thermostat setup to operate existing system correctly

  • SF
  • MH
  • MF
Specification Objective

Seal penetrations for control wiring with a durable sealant (e.g., caulk, silicone) that complies with applicable fire safety code

Minimize air leakage, prevent pest intrusion, increase temperature measurement accuracy

  • SF
  • MH
  • MF
Specification Objective

Provide occupants/owners with user's manual, warranty information, installation instructions and installer contact information

Control instructions available for occupant and installer

View Sub-Topic:
Controls