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    raven25's Avatar
    raven25 Posts: 1, Reputation: 1
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    #1

    Nov 19, 2008, 03:52 AM
    Honeywell Thermostat RTH6300B for a Heatpump
    Question: When installing the new thermostat I found that my new wire designations do not match up with my old thermostat's wire designations. The Honeywell installation guide provide less common wire designations but I still can't match them. My old Thermostat (Lennox) has Y,M,F,V and R but the new thermostat has G,W O/B, Y, R, and Rc. I believe I have some of the old designations hooked up correctly (F-G, V-R, R-Rc) but now sure where to hook up the Y and M. The Honeywell guide provides no insight what to do with the M wire.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Nov 19, 2008, 04:17 AM
    Quote Originally Posted by raven25 View Post
    Question: When installing the new thermostat I found that my new wire designations do not match up with my old thermostat's wire designations. The Honeywell installation guide provide less common wire designations but I still can't match them. My old Thermostat (Lennox) has Y,M,F,V and R but the new thermostat has G,W O/B, Y, R, and Rc. I believe I have some of the old designations hooked up correctly (F-G, V-R, R-Rc) but now sure where to hook up the Y and M. The Honeywell guide provides no insight what to do with the M wire.

    Look under Lennox on the attached diagram.
    Attached Images
  1. File Type: pdf heat pump wiring.pdf (13.3 KB, 137 views)

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