HVACopediaGoodman-Amana-Daikin · Heat pump · Heating
Communicating heat pump heat, balance point and auxiliary heat
What happens, in order
- Control asks the heat pump for outdoor air temperature
- Above the balance point the heat pump runs; below it the heat pump is locked out and only electric heat runs (balance point set in the CoolCloud HVAC app or by board buttons)
- Low stage request goes to the UC control; fan speed request to the air handler; compressor and fan start at low stage
- If low stage cannot keep up, blower goes to high stage speed and the heat pump goes to its high stage solenoid and high condenser fan speed
- If still short, auxiliary heat is added and the air handler picks the highest airflow demand
- Demand met heat pump stops; air handler drops the heater outputs and keeps the ECM blower until the off delay ends
- Control may start directly in high stage
Applies to: Goodman ComfortNet ASZC / GSZC / DSZC heat pumps with AVPTC air handlers
Models
More Goodman-Amana-Daikin heat pump sequences
- Heat pump heat with electric backup stages · Heating
- Communicating defrost and forced defrost · Defrost
- Timed defrost with sensor and override · Defrost
Take it to the job
Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: Goodman ComfortNet ASXC/DSXC/GSXC service, Sequence of Operation AVPTC/DSZC heat pump. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.