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    dwratchet's Avatar
    dwratchet Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 20, 2009, 10:07 AM
    General controls thermostat T99AH
    I am replacing an old ITT General Controls thermostat with a Honeywell RTH7500D. My heating system is a forced air gas furnace (no air conditioning). My old thermostat has 2 wires coming from the furnace, but there are no labels on the old thermostat. Both wires are white. I have no idea where to hook the 2 wires on the new thermostat. Any help would be appreciated. Thanks
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Dec 20, 2009, 11:28 AM

    I actually agree with you.

    The stat is compatible with a 750 mV system which is probably what you have.

    Leave the jumper in place from R, Rc although it doesn't matter.

    Connect your wires to R and W. Configure for gas heat.
    dwratchet's Avatar
    dwratchet Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Dec 20, 2009, 12:20 PM

    Thanks for your help KISS. Seems to have solved my problem.
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