Thermostat upgrade with heat pump, W1, W2, and Y

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  #1  
Old 06-05-10, 04:50 PM
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Thermostat upgrade with heat pump, W1, W2, and Y

I'm trying to upgrade my thermostat to a Honeywell TH8320, and I'm not sure what wire configuration to use.

My current setup is as follows:

Orange "O" wire to O terminal
Red R to R
Black T to T, with a 650 ohm (I think) resistor to the C terminal
Green G to G
Yellow Y to Y
White W1 to W1
Brown E to E
Blue W2 to W2

The Honeywell manual only refers to W1 and W2 wires when discussing conventional systems, but I'm pretty sure my system is a hear pump. Can anyone offer any advice on how to connect this? Thanks in advance.
 
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Old 06-06-10, 07:08 AM
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re wire it like it was, with black going to C. universal tstats... tut
 
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Old 06-06-10, 08:39 AM
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The problem is that I don't know what to do with the W1 and W2 wires. As I said, the manual only offers explanations of W1 and W2 in the context of conventional heat systems, and in conventional systems the W wire is connected to the terminal that is O/B in heat pump systems. Since I have an O wire, I can't connect the O and the W to the same terminal (or can I?).

Is it weird that I have a Y, W1, W2, and O? I also have an E, which isn't considered in the conventional system diagrams.
 
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Old 06-06-10, 11:41 AM
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sorry i was still kinda asleep when i wrote that but im awake now. it is weird you have a w1, w2, and an e. w1 is the heat from the heat pump, w2 would usually be stage 2 heat being either gas furnace backup or 2nd compressor on the condenser and e would be electric strip backup which you should have if you dont have gas backup. do you have one of those? and im lookin at a pic i found, there does not seem to be an 'e' or a "w2" terminal on that tstat and it looks like O and w are the same point. i would say return this tstat, universals are never good, go strictly heat pump and make sure it has all the terminals.
 
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Old 06-08-10, 05:37 PM
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if it does not have an "e" terminal its not a true heat pump t stat
 
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Old 06-08-10, 06:50 PM
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I'd like too look into that C a little further.
What is the make and model of your old stat?

This is a Honeywell Q674E 1049 subbase..





The Honeywell VisionPro TH8320 is an excellent thermostat.
Your options on stage 2 and 3 heat..
Connect both to W2 or connect white to W2 and tape off blue.

 
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