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    big larry's Avatar
    big larry Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 26, 2008, 09:22 AM
    changing thermostats
    Hi,
    I have a furnace with a heat pump. My original thermostat is a Honeywell T8411R1002 manual. The new one is a Honeywell T841A1217. The old one has places to hook up 7 wires. The new one has places for 9 wires. The Gray wire is marked as X on the old one. On the new one there is no X for the gray wire. L, B, and C is not being used. Where does the gray wire go?

    Thanks,
    big larry
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 26, 2008, 11:54 AM
    here is a diagram for the old thermostat.

    http://customer.honeywell.com/techli...0s/69-1037.pdf


    here is a diagram for the new thermostat.


    http://customer.honeywell.com/techli.../69-1217ef.pdf


    According to Honeywell the new thermostat is older than the new thermostat? Could it be you got them switched in your post? I would reconsider your selection of heat pump com=ntrols if this is the case. Why would you replace a newer with a older control?

    X is used as a common by some manufactures.

    What brand is your heat pump?
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