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Thread: Question about wiring a CT87B Honeywell thermostat

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    DIY scratch-pad engineer leejosepho's Avatar
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    Default Question about wiring a CT87B Honeywell thermostat

    I knew our furnace was not cycling properly, so I decided to move our thermostat to a different wall while also replacing the old T87F Honeywell...and then I discovered what I think is a wiring problem that essentially bypasses the anticipator that had not been set correctly anyway.

    note: The old T87F is presently mounted on a newer base plate nearly identical to the plate for my new CT87B.

    For a 4-wire heating/cooling system like we have, the instructions say to power Rh and Rc...but my picture shows how the current plate is wired differently. So before I follow the directions, does anybody know a reason I should not?

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    Last edited by leejosepho; 12-11-2012 at 01:45 PM.
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