HVACopediaGoodman-Amana-Daikin · Heat pump · Heating
Heat pump heat with electric backup stages
What happens, in order
- Thermostat set to heat reversing valve stays de-energized
- First stage call 24 V to Y at the outdoor unit and G at the blower board
- Heat pump starts; blower starts after the 7 s on delay
- If the heat pump cannot keep up, W2 energizes the heat sequencer HR1 and element 1 (and 2) come on 10 to 20 s later
- If still short, W3 energizes HR2 for elements 3 and 4
- When demand is met, elements drop out (sequencer contacts open 30 to 70 s after power is removed)
- Heat pump stops and the blower stops after the 65 s off delay
Timings and thresholds
| Item | Value |
|---|---|
| Blower on delay | 7 s |
| Blower off delay | 65 s |
| Sequencer pull-in | 10 to 20 s |
| Sequencer drop-out | 30 to 70 s |
Applies to: Goodman heat pumps matched with MBR / AR*F or MBE / AEPF air handlers (mercury bulb thermostat sequence)
Models
More Goodman-Amana-Daikin heat pump sequences
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Source: Goodman R-410A ASX/GSX/DSX A-C and ASZ/GSZ/DSZ HP service RS6200006, Sequence of Operation sections 3.0 and 4.0. 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.