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    JPD's Avatar
    JPD Posts: 1, Reputation: 1
    New Member

    May 9, 2007, 02:40 PM
    Thermostat Wiring

    I bought a Noma Programmable Therm. Model 52-2549-0 and installed it in the winter.

    The Furnace worked fine, but now I tried the AC and no go.

    I have 4 wires. 1 set in a Green Insulation around a Red and Black wires and the other 2 wires are white and black.

    Here is how it is plugged into the noma thermostat

    G - Red Wire - Green Insulation one
    Y - Black Wire - Green insulation one
    Rc/Rh - Black Wire (jumpered)
    W/ B/O - White

    Any ideas?

    Thank you
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member

    May 9, 2007, 05:27 PM
    Do you have any idea where these wires were on the old thermostat? What model is the furnace?
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
    Ultra Member

    May 9, 2007, 05:50 PM
    Look at the terminal board in the furnace and determine where the wires from the thermostat go to on th terminal board.
    The R terminal should match up with the Rh on the thermostat.
    The W terminal should match up with the W on the thermostat.
    The G terminal should match up with the G on the thermostat
    The Y terminal should match up with the Y on the thermostat.

    Also on the Y terminal at the furnace you should have a wire from the compressor.
    Also on the C terminal at the furnace you should have a second wire from the compressor.

    You can use a OHM meter to find out which wires are which.

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