I have an American Standard heat pump AC. I'm replacing a White-Rodgers manual thermostat (where I move a switch from cold to heat) with a Honeywell RTH7600 (which will automatically switch from cold to heat).
When I take off the old thermostat, I have a red wire (power) that will go to the Rc with a built in jumper. I have a green wire (fan) that will go to the G. I have an O wire that will go to the O/B.
My problems lies with the yellow wire. My yellow goes to the Y and also to a W. If I'm reading my manual correctly, I think I can put the yellow wire only to the Y since the new Programable thermostat automatically switches from cold to heat.
Is my thinking correct?
Best Answer
See below, if you jumper Yellow to White the heat strips will run in both cool and heat as Yellow is energized in both modes, what makes it a cooler or heater is the O being energized in cool mode Rheems use the B terminals to be energized in heat.