Help switching thermostat

Old 07-01-07, 09:34 AM
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Question Help switching thermostat

Hello everyone, I'm trying to replace my thermostat with a newfangled programmable one. The current thermostat is from the original company, Payne. On the thermostat it says that it is a heat pump, as well as having emergency heat. I chose to get the Honeywell rth7000 series. The problem is the letters don't quite match up. On the original Payne thermostat I had wires connected to:

C, G, O, R, Y, W1, W2, T (Connected from C through a resistor), and E.

Now, on the new Honeywell thermostat I have places for:

C, G, O/B, R, Y, Aux, E, RC, L

Per the instructions, I hooked it up as such:

Payne - Honeywell
R - R
- RC (Jumper from R)
O - O/B
Y - Y
G - G
E - E
W1 - Aux
C - C

Which leaves W2 as the only leftover. I capped this one off and left it disconnected.

Now, I put everything back together and it is working, however, the Air Conditional will only cool off to about 82 degrees and before, it would cool off as much as I asked. I'm thinking that the W2, needs to be connected, but I'm not sure what all these letters mean and where I would connect it to. Any suggestions? Thanks in advance.
Old 07-01-07, 10:31 AM
Join Date: Mar 2007
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Is this a home depot Tstat?
It's programable so did you go through the set up and make sure it is in multi stage Heat pump mode?

I'm not fimalure with the 7000 series but the 7500 series I know you have to set it up for heat pump multi stage heat(Aux and Emergency Heat)
I believe it is number 7

Then do not get mixed up with the terminals on the stat because the inside is for a regular straight air hookup and the outside letters are for heat pump.

For heat pump on a payne system your reversing valve is O this is actually your W1 and then your Aux heat would be W2 and Emergency heat E.
Old 07-05-07, 06:23 PM
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I finally gave in and called someone, they said all the wires in the back were burned up and that I needed to replace everything! So I called someone else and they said that it needed freon. After adding some freon, it's cooling fine now. Thanks for the help!

P.S. Is there any way for a do it yourselfer to check the freon? Thanks.

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