HVACopediaICP · Heat pump · Cooling
Heat pump: cooling cycle
What happens, in order
- On a call for cooling the thermostat makes R-O, R-Y and R-G
- R-O energizes the reversing valve into cooling position
- R-Y energizes the contactor, starting outdoor fan and compressor
- R-G energizes the indoor blower relay, starting the blower
- Thermostat satisfied contactor and blower relay drop out and compressor and motors stop; an indoor time-delay relay, if fitted, keeps the blower running a while longer (cooling and heating)
Applies to: ICP N4H3 heat pump
Models
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Source: ICP N4H3 heat pump installation instructions (428 01 5103), Defrost Control Board and Sequence of Operation. 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.