Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. Y, Y1, Y2: Whenever your thermostat calls for cooling, the Y wire is used to send a signal to your HVAC system telling it to fire up the air conditioner. ![]() We have a good post on heat pump thermostat wiring on the following page. use a voltmeter to test and see which are the two wires from the transformer R and C (common). Thermostat wiring diagram heat pump honeywell wire hvac diagrams heating control air cooling system highperformancehvac stage conditioning cool electrical basicThen look up the old thermostat's wiring diagram on the Internet and see if you can find out what 1,2 & 3 are controlling on your old thermostat. Heat won't turn off on goodman aruf-030-00a-1. diagram wiring pump heat rheem thermostat untpikapps water heater. 7681-318 Coleman Blend Air II Control Board. A simple 15-minute install is all you need to start using the system. This is a mechanical thermostat, so there aren’t any complicated setups, mobile apps, or touch screens to learn. If you want a thermostat explicitly designed for heat pumps, the Honeywell RTH3100C1002 is the model for you.
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