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Modular blower EAC and humidifier timing
What happens, in order
- EAC relay closes about 2 seconds after the blower starts
- EAC relay opens when the blower motor stops
- HUM relay closes on any heat pump heating call about 1 second after the blower starts
- HUM relay opens when the heating call is removed
Timings and thresholds
| Item | Value |
|---|---|
| EAC delay | about 2 s after blower starts |
| HUM delay | about 1 s after blower starts |
Applies to: P0V0 modular blowers
Models
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Source: Trane P0V0 modular blower installation 18-GE20D1-1E-EN (Nov 2021), Sequence of Operation pp.30-33. 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.