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Honeywell t87 wiring diagram - Heating & Cooling

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Posted on Jan 02, 2017

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SOURCE: What position does the small

The switch on the right side of the T87 is for the fan. Down is the auto position which will cause the fan to run only when needed. Up is the always-on position, used to circulate the air constantly. If you want to shut down all heating cooling associated with this thermostat you need to look at the switch on the left side of the stat. To the right is heating, center is OFF, and left is ac.

Posted on Dec 16, 2008

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I have a rth3100 that i installed programed it ac came on the next day went off and wont come on it was cycling on and of. After new one was installed dont have power to it


http://www.ps2netdrivers.net/wiring.diagram/honeywell.rth3100c/

Here you can find all about Honeywell RTH3100C like wiring diagram and other informations. For example: thermostat wiring diagram, installation manual, installation, thermostat, wiring, manual.

Honeywell RTH3100C manual (user guide) is ready to download for free.

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The two wire Honeywell T87 and CT87 is nothing but a switch in a control circuit. Wire color is not important at all. What is important is the TERMINAL DESIGNATION those wires are hooked to. Soooo....take the wire off of the sub base of the old stat terminal marked 'R' and attach it to the new sub base terminal marked 'R' and so on. Wire COLOR means nothing at all in your case.

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I have a T87 that i was replacing, red with red, white with white none of the setting fron behind work, the thermostat started to smoke, i could not connect it, what to do?


It sounds to me like you may have a defective thermostat. I would check wiring to furnace cotrol board on furnace and see if its is wired differently.If at this time of year for heat only red and white should do it. Hope this helps. Thanks

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What position does the small lever on the right side of the T87 Honeywell Round T-stat need to be in to be OFF ?


The switch on the right side of the T87 is for the fan. Down is the auto position which will cause the fan to run only when needed. Up is the always-on position, used to circulate the air constantly. If you want to shut down all heating cooling associated with this thermostat you need to look at the switch on the left side of the stat. To the right is heating, center is OFF, and left is ac.

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1 Answer

I've replaced my very old (mercury) Honeywell thermostat with a new one (round, Model: YCT87K1011), but I can't get it to control the temperature. If I connect the two wires one way, the furnace comes on...


Hey John, man that ole T87 has been around for a hundred years and I have installed many of them, but I cant remember the letters on the wiring. Seems to me that it is R-W-Y, any way you will use the R and W. I have a t87 at home still in the box and I could wait till I got home to help you but Im sure its the R and W terminal. Dont forget to set the heat anticipator. Set it the same as the current value of your gas or oil valve.

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