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T-stat problem I am workig on a 92 intertherm.Trying to install new stat to control heat and cooling. top of control panel only has C Y W R were does the fan wire (green) connect ? the only #s I have togo by are 901698-2wire relay box

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HEY, the only logical explanation is, that unit didn't have fan only.

Posted on Sep 09, 2008

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My old thermostat has 8 wires and I'm trying to figure out how to install a Honeywell Rth2310b thermostat.


The terminals on the old stat should be basically the same as on the new stat...with a couple exceptions anyway. Note the color of wire on each terminal before removing them and reconnect to the new stat on the same terminals. 8 wires typically indicate a heat pump, so in the configuration menu you'll have to tell it whether to energize the O terminal in cool or not. If you have individual wires on Rc and Rh terminals, you must remove the factory jumper between those two terminals on the new stat. If not, you'll burn out one of the two control transformers or possibly damage your new stat.

In the configuration menu, you'll have to tell it whether its a gas furnace or electric furnace, select the way the fan operates and possibly limit the cycles per hour on both heat and cool modes. There's a lot of subtle entries that need to be done to 'tailor' the new stat to your likings also.

I think it would be best to rely on someone thats a bit familiar with HVAC to change out your stat for you..... as once it is changed, all possible functions of the stat need to be verified as correct in operation.

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Some of the old heat pumps made the reversing valve in the heating mode. On your new thermostat the orange wire will need to be on the B terminal. If it was color coded? I hope you made notes of how it was.

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1 Answer

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on the round its r g w hook that on the new stat if your using it for heat to then the rh and w are heat controlling baseboard or a boiler relay? the new stat has a jumper wire remove that it is hooked up to rh and rc un plug every thing good luck Tom

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A contractor cut the wires from my Coleman forced air furnace, It was hooked up to a stat that ran my evap cooler and heat. I am trying to put in a new straight heat stat but I can't get the stat to...


Does the new stat have a pin labled (G)? Connect your fan wire (usually green) to that pin, and then call for fan on your therm. Straight heat stat means it has only heat and cool pins, there is no option for fan. If your not getting the fan to come on including heat, make sure you have the white wire and red wire connecting to your new stat.

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