What does the purple wire do on a Rheem Heat Pump?

Are you talking about gas or electric heat? The wire is used to turn on strip heat.

Does Rheem heat pump use O or B?

The O and B terminals are for heat pumps; the B terminal is used in conjunction with Rheem, Ruud, or any other manufacturer that energizes the reversing valve in the heat pump’s heating mode. Most other manufacturers of heat pumps will utilize the reversing valve for cooling including the O thermostat.

What is the AUX wire on a thermostat?

Some HVAC systems support auxiliary heat (AUX) as well as emergency heat (E). A thermostat senses this and automatically turns on electric heat strips to provide the additional heat needed. Some thermostats have an E wire. The E wire controls emergency heating.

How many wires does a heat pump thermostat have?

In heat pump system, there are at least 8 wires that need to be connected to the thermostat for proper operation.

What is the D terminal on a Rheem Heat Pump?

Terminal D on our HP is energized when your HP goes into Defrost. So you will want to bring on your aux heat to temper the air, and not freeze, by either connecting to W1 or W2, or both.

What is D on a Rheem Heat Pump?

Y=Compressor Contactor. B=Reversing Valve…Rheem is de-engerized for cool. D=Defrost Heat. R=24v Hot.

How do I know if I have heat pump O or B?

If you have a heat pump and your thermostat doesn’t have a separate wire labeled O, then the wire labeled B should be connected to the Nest thermostat’s O/B connector.