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-   -   Lennox thermostat replacement with Honeywell-wiring (https://www.askmehelpdesk.com/showthread.php?t=274776)

  • Oct 28, 2008, 08:15 PM
    Regsmom
    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. :)
  • Oct 28, 2008, 11:45 PM
    hvac1000
    1 Attachment(s)
    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.
  • Jan 1, 2010, 07:45 PM
    rassman
    What about the A (Orange) Wire, where would it go on the Honeywell RTH8500?

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