Question about Honeywell Programmable Thermostat Heater

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Change thermostat My old intertherm thermostat has green, red, yellow, white, orange, wires model 1D36, the terminal on the intertherm are G,R, A, Y, W, I'm replacing the intertherm with a honeywell model rth5100b The terminal are mark Rc, R, Y Not used, O/B W, G. Where do I put the orange wire.

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  • Anonymous Feb 22, 2009

    I had a Trane Thermostat that had G, O, X2, Y, R, W, & B. The Honeywell RTH6300B says to use G, W, Y, R. It says do not use B, says nothing about X2, and I think I'm supposed to use O but not sure where to put it. I have a heat pump.

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  • Master
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You have caught me without my old books, but I can tell you the orange wire is for the reversing valve on a heat pump. Almost all manufacturers, except for Lennox, are: R=Power (24volts), G=Indoor fan (Blower), Y=Cooling (A/C), and W=Heat. Some t'stat's are set up to use 2 separate transformers (24 volt), that is why you will see Rc, Rh. This is power for cooling and power for heating. If this is what you have, just take the Red wire and strip it back far enough to go under both screw terminals if the unit is a residential one. I've been doing commercial work for over 20 years and have never seen an "A" terminal, so I can't help you there. You may want to double check that. If I'm reading you correctly, I would put the orange wire on the "O" terminal. Don't understand why the "Y" terminal is not used. It turns on the compressor. The "O" goes to the reversing valve to "Tell" the outdoor unit that it is either in the cooling or heating mode.

Good Luck and let me know if I can help any further.

Posted on Feb 28, 2009

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My suggestion would be that your black wire is for your cooling(Y), and all other colors wire up to the corresponding terminals. There are many systems that are ran only by 2 and 4 wire setups, therefore, it's possible that whoever ran your wire initially did not have a yellow wire in the strand. Also, if there is a yellow wire in the strand(possible 7wire strand), it could also be that the wire had a short and they switch the wires to bypass the short. Hope this helps and Happy Holidays!

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