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    Regsmom's Avatar
    Regsmom Posts: 1, Reputation: 1
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    #1

    Oct 28, 2008, 08:15 PM
    Lennox thermostat replacement with Honeywell-wiring
    I am trying to replace a heat pump thermostat. It was a Lennox Thermostat and I am replacing with a Honeywell R TH3100C. The letter wiring designations do not match up. On the Lennox I had R, V, F, M, L, A, Y, X the E (did not have any wiring hooked to it). My options on the Honeywell is E, AUX, Y, G, O, L, R, B, and C. I need help as I am very confused. Thanks for your quick response Mom of three kids. :)
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 28, 2008, 11:45 PM
    Quote Originally Posted by Regsmom View Post
    I am trying to replace a heat pump thermostat. It was a Lennox Thermostat and I am replacing with a Honeywell R TH3100C. The letter wiring designations do not match up. On the Lennox I had R, V, F, M, L, A, Y, X the E (did not have any wiring hooked to it). My options on the Honeywell is E, AUX, Y, G, O, L, R, B, and C. I need help as I am very confused. Thanks for your quick response Mom of three kids. :)

    Lennox and others wiring change over doc.
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  1. File Type: pdf heat pump wiring.pdf (13.3 KB, 1788 views)
    2. rassman's Avatar
    rassman Posts: 1, Reputation: 1
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    #3

    Jan 1, 2010, 07:45 PM
    What about the A (Orange) Wire, where would it go on the Honeywell RTH8500?
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