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

    May 2, 2009, 01:50 PM
    Replacement Thermostate installation
    Hello,
    I recently purchased a Totaline Thermostat P/N P374-1800
    My old on has a 4 wire system. Propane(Gas) and single heat,and single cooling .

    The wire colors are Green, yello,white and red. I wired the new one, red-R,green-G, Yellow-Y1 and white -W1.
    I did not use C (+24vac common) and
    I did not use W2 (2nd stage heat ciruit)
    Now when I instaled face cover, Nothing shows in display.
    NO What? I could sure use some help...
    Thanks
    Bob
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #2

    May 2, 2009, 04:02 PM

    Does this t-stat have battries? Odds are pobally not. You will need to get a coommon wire to this stat to work. From common on the unit to c on the stat. Or you can get a different stat that says battery operated not 24 volt operated
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member
    		  
    #3

    May 2, 2009, 05:22 PM
    Yep,, and cross your fingers,if you didn`t kill the breaker to the furnace ,hope that you didn`t blow the transformer,, it happens a lot
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #4

    May 2, 2009, 08:52 PM
    You need the 24v common wire to make it work. That's a two stage heat two stage cool thermostat be sure to set it up for a/c and not hp.
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