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?