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    rotsen's Avatar
    rotsen Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 23, 2006, 05:42 PM
    Noma programmable thermostat
    I have an old carrier thermostat model q674j119 or t874g1790 for my oil furnace and heat pump. I tried to change this with Noma programmable thermostat model 52-2558-8 but everythings not working.
    This was the wiring for the original thermostat:
    O -> Orange
    R -> Red
    W2 -> White
    G -> Green
    C -> Black
    L -> Blue
    Y -> Yellow

    Following the directions, this is the way I have the new thermostat connected:

    H2 ->
    H1 ->
    B -> Blue
    O -> Orange
    RC -> Jumper with RH
    RH -> Red
    G -> Green
    Y -> Yellow
    W -> White

    Black -> nowhere

    What will I do to fix this?
    Kender's Avatar
    Kender Posts: 64, Reputation: 13
    Junior Member
    		  
    #2

    Oct 24, 2006, 06:07 PM
    I would remove the blue wire from the B terminal. Leave the blue and black unused and taped so they can't short out.
    The blue wire was on L before and that is used to flash error codes using the thermostat. This stat does not use that.
    METT's Avatar
    METT Posts: 14, Reputation: 1
    New Member
    		  
    #3

    Oct 29, 2006, 09:10 PM
    Quote Originally Posted by rotsen
    I have an old carrier thermostat model q674j119 or t874g1790 for my oil furnace and heat pump. I tried to change this with Noma programmable thermostat model 52-2558-8 but everythings not working.
    This was the wiring for the original thermostat:
    O -> Orange
    R -> Red
    W2 -> White
    G -> Green
    C -> Black
    L -> Blue
    Y -> Yellow

    Following the directions, this is the way i have the new thermostat connected:

    H2 ->
    H1 ->
    B -> Blue
    O -> Orange
    RC -> Jumper with RH
    RH -> Red
    G -> Green
    Y -> Yellow
    W -> White

    Black -> nowhere

    What will I do to fix this?
    I think this thermostat does not support heat pump + furnace.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #4

    Oct 30, 2006, 06:00 AM
    Quote Originally Posted by METT
    I think this thermostat does not support heat pump + furnace.
    Your probably right. It doesn't look like it has second stage heat for your emergancy heat.
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