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Old 10-07-2009, 11:36 AM   #1
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Installation of thermostat

I am trying to reinstall an intertherm thermostat. ( Gas forced air heating with Air. I have four wires. 1 is labeled Y, 1 is labled R and 1 is labled W.
The last wire is not labeled, so I do not know where to connect it. My choices on the thermostat are O, B and G. The furnace is a three year old


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Old 10-07-2009, 05:58 PM   #2
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Installation of thermostat

Look at the wires where they attach to the furnace circuit board and find where your lonesome wire goes. 99% sure it is for G. O and B are for heat pumps.

Last edited by yuri; 10-07-2009 at 06:00 PM.
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Old 10-07-2009, 06:13 PM   #3
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Installation of thermostat

with power on the furnace and the stat off the subbase.take the mystery wire and touch the R terminal with the R wire connected,should bump the supply fan ......G Y is condenser,R is hot 24Vs,W is heat,G is fan
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Old 10-08-2009, 05:09 PM   #4
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Installation of thermostat

Thanks for the help.

The problem turned out to be a broken G wire. I was broke inside the wall about 6 inches behind the thermostat. Unit is working fine now.

Thanks Again
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