HVACopediaKeepRite · Air conditioner · Cooling
Split A/C: cooling cycle with standard thermostat or communicating control
What happens, in order
- Thermostat makes R-Y and R-G on a call for cooling
- R-Y energizes the contactor, starting outdoor fan and compressor
- R-G energizes the indoor blower relay, starting the indoor blower on high speed
- Thermostat satisfied contactor and blower relay drop out and compressor and fan stop
- If the indoor unit has a time-delay relay the blower runs 90 s more
- With a communicating wall control the outdoor board applies a 5 minute start delay; with a 2-wire hookup this delay is only 10 s
- Outdoor fan keeps running 1 minute after the compressor stops if outdoor air is 100 F or higher
Timings and thresholds
| Item | Value |
|---|---|
| Start delay (communicating) | 5 min |
| Start delay (2-wire) | 10 s |
| Brown-out recycle delay | 5 min |
| Indoor blower run-on (with TDR) | 90 s |
| Fan run-on at 100 F+ outdoor | 1 min |
| Return to standby after last communication | 2 min |
Codes you may see during this
Applies to: KeepRite / ICP C4A3, H4A3, T4A3, CXA6 R-410A split air conditioners
Models
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Source: KeepRite/ICP C4A3-H4A3-T4A3-CXA6 air conditioner installation instructions 421 01 5103 05, Sequence of Operation and Control Functions. 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.