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Old 10-03-2010, 09:03 AM   #1
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Question re: Heat Pump tsat wiring


I'm replacing an American Standard (ASYSTAT 570) tstat with a Hunter 44860 and the wiring codes are different.

I have an American Standard 2-stage heat (heat pump), single stage cool electric unit.

Old wiring:
American Standard:
Green Wire - G
Blue Wire - B
Red Wire - R
Yellow Wire - Y
White Wire - W
Black Wire - X2
Orange Wire - O

I called Hunter tech support and they had me wire it up this way:
Green Wire - G
Blue Wire - C
Red Wire - RC (left the jumper in place, connecting RC/RH)
Yellow Wire - Y1
White Wire - W2
Black Wire - E
Orange Wire - O

Trouble is, now nothing turns on, no fan, nothing.

Any ideas?
Much appreciated-

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Old 10-03-2010, 05:21 PM   #2
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Question re: Heat Pump tsat wiring


Check for power...did you short out the transformer when you wired it ?

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Old 10-03-2010, 07:40 PM   #3
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Question re: Heat Pump tsat wiring


I notice that you changed the blue wire from B to C. Did you make the necessary changes on the other end of the wire? The colors of the wires really mean nothing. They are only used to identify each end of the wire, although there are standard practices pertaining to which color to use for each terminal (eg. red for r-r, yellow for y-y, etc).
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Old 10-03-2010, 08:14 PM   #4
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Question re: Heat Pump tsat wiring


@kenmac - besides a tripped breaker, is there any other way of checking? I shut off all the circuits before I took the old tstat off. Unfortunately, I missed one breaker and saw a brief spark when I was removing the wires. I immediately went down to my service panel and shut off the fourth (and elusive) breaker. I even checked the two breakers that are on the furnace...they're fine and didn't trip. (It wasn't next to the others in the stack...that's how I missed it.) So, the whole unit was powered off when I hooked up the new unit. Then, with all 4 breakers on, still no activity, although I can hear a *quiet* hum from the furnace. (I think it was always there?)

@hvac benny- I told the tech at Hunter what my wires went to on the old tstat, and they told me where to take them. The old tstat didn't take batteries and the new one does. They told me that the blue wire goes to the "C" terminal to provide power to the unit.
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Old 10-03-2010, 08:29 PM   #5
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Question re: Heat Pump tsat wiring


@hvac benny- I told the tech at Hunter what my wires went to on the old tstat, and they told me where to take them. The old tstat didn't take batteries and the new one does. They told me that the blue wire goes to the "C" terminal to provide power to the unit.[/quote]

So what you're saying is that you only changed the wires to the t-stat? If this is the case then you have c on the t-stat connected to b on the heat pump.
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Old 10-03-2010, 08:33 PM   #6
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Question re: Heat Pump tsat wiring


You probably blew the fuse inside the air handler. if it doesn't have a fuse, then you may have burnt out the transformer.
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Old 10-05-2010, 08:53 AM   #7
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Quote:
Originally Posted by beenthere View Post
You probably blew the fuse inside the air handler. if it doesn't have a fuse, then you may have burnt out the transformer.
Exactly the issue. Replaced the 5amp fuse and we're golden.

Thanks!
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Old 10-05-2010, 01:15 PM   #8
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Question re: Heat Pump tsat wiring


shorted out. Lucky you had a fuse ( some don't) or you would be buying a new transfomer Always make sure power is off


Good luck
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Old 10-05-2010, 02:27 PM   #9
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Quote:
Originally Posted by kenmac View Post
shorted out. Lucky you had a fuse ( some don't) or you would be buying a new transfomer Always make sure power is off


Good luck
I bet he knows that now.

cwelte. Your not the first to do that, and you won't be the last.
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Old 10-05-2010, 06:55 PM   #10
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Question re: Heat Pump tsat wiring


Quote:
Originally Posted by beenthere View Post
I bet he knows that now.

cwelte. Your not the first to do that, and you won't be the last.


Nope. years past. I 've let the smoke out
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Old 10-05-2010, 07:09 PM   #11
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Question re: Heat Pump tsat wiring


We all have.

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