electricalheat-pumpwiring
I'm replacing an old thermostat with a slightly newer thermostat. It's connected to a heat pump and the old wiring (picture attached) was:
White = W2
Yellow = Y
Brown = O/B
Red = R
Green = G
Blue = C
The new thermostat doesn't have a C connection (see picture) so I'm not sure what to do with the wire. Note that the heat pump designations are on the outside edge of the thermostat.
How do I wire the new thermostat? Any help would be greatly appreciated.
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.
I found the solution by playing with it. On the new thermostat, remove the blue and grey wires, as they are just relays to the temperature sensor. Black goes to C, and link E and AUX. In the thermostat settings, go to option 170 and change it to option 2 for heat-pump settings. This process did the trick for me.
Best Answer
Some of these thermostats do not require and do not give you a place for the common,blue wire. We call these thermostats power robbing thermostats. They have the ability to take enough power from the working wires to maintain their own functions without a common lead. This thermostat will work just fine without the common. Just cap it off and push it in behind the thermostat. The only drawback for this type of stat is that when you loose power to the house the stat won't work. Who cares! Nothing else works either.