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Old July 24th, 2008, 07:33 PM   #1
cj7
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Default HVAC GUYS... thermostat help

I bought a programable thermostat tonight to control my A/C only.
and wired it up.
it dont work.
It has 4 wires , hooked to old thermostat was white to w, blue to y, red to r, and green to g.
I hooked it up as follows: green to g,blue to y, white to white, and red to rh with a jumper to rc.

if you turn the fan on it comes on and stays on
if you turn the A/C on it comes on for a second then shuts off.

any ideas?
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Old July 24th, 2008, 07:39 PM   #2
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Got it thanks
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Old July 24th, 2008, 09:05 PM   #3
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white=heat
yellow=cooling
red=fan
green=ground

I think
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Old July 24th, 2008, 10:36 PM   #4
BigBlkYJ 355
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Quote:
Originally Posted by Fatty Matty View Post
white=heat
yellow=cooling
red=fan
green=ground

I think

Red = +24v from xfmr in furnace
Yel= Cool
White= Heat
Green= Fan

There is no ground or -24v at the stat usually, unless you have a fancy one with more than 4 conductors.
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