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adidasprof · Dec 16, 2005, 04:16 PM

I just moved into a new house, well new to me. It has a heat pump system. I'm not familiar with them at all and need some help. I took out my old mechanical thermostat and replaced it with a programmable digital thermostat. Now my problem is that the heat won't quit running. I don't know if I have it wired incorrectly or not. From my old thermostat (Lennox 21J7201) the wires were tied in like this
R=Red
Y1=Yellow
G=Green
0=Orange
C=Blue
W1+E=White

The white was tied in to both the W1 and the E. In the new thermostat (Hunter model # 44260) the wires are tied in like this:

G=Green
RH=Red also has jumper to RC from factory
Y/O=Orange
W/B=White
Y1=Yellow

Do I just have the wrong type of thermostat? I don't know if I have a single stage or multistage heat pump. Any help would be greatly appreciated.

labman · Dec 16, 2005, 05:44 PM

Red, R, RC, and RH are all power from the transformer. White, W and W1 should be the signal for heat. Yellow, Y1 is the signal for cooling. Green, G is for fan only. Blue, C is the common from the transformer. Orange, O usually connects to the reversing valves on a heat pump. E may have been meant for a different heating rate and jumpered to W to call for a single rate of heating when the thermostat signaled for either rate of heat. Only Hunter knows what Y/O and W/B do. You are going to have to pick through the instructions and figure out what they do, and then connect the proper wire to them. See what you can find. Post back. If you haven't fixed it, maybe you will have found enough out somebody else here or I can figure it out.

adidasprof · Dec 16, 2005, 05:53 PM

Thanks Labman,

According to the instructions:
RH, R, VR, or 4= RH 24 Volt
RC, VC= RC 24 Volt
G, F = Fan
Y/O = the reversing valve operation in cool mode
W/B = the reversing valve operating in heat mode
Y1 = Heat Pump Compressor

labman · Dec 16, 2005, 08:39 PM

From those instructions I would assume the thermostat switches power to W/B when ever the heating mode is selected, and then to Y1 when it calls for heat. I think you want to connect the wire that goes out to the heat pump compressor, yellow? to Y1 on the thermostat, and the wire that goes to select the heat position for the reversing valves to W/B. If the reversing valves only seems to have one pair of wires, try connecting both its hot wire and the hot wire to the compressor Y1, and nothing to W/B or Y/O.