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    tombo's Avatar
    tombo Posts: 5, Reputation: 1
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    #1

    Aug 27, 2006, 04:53 PM
    Upgrading to programmable ac/heating thermostat
    I am replacing an old thermostat for ac/heating. There are 5 wires red, white, orange, black, green.
    My new unit (Noma programmable thermostat).

    The instructions indicate points of connection using red, white, yellow, green.
    My confusion is, where do I connect orange and black, because there are only wire connections on my new unit, marked, green, red, yellow, white.
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
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    #2

    Aug 27, 2006, 05:41 PM
    Is this a heat pump that you have?
    tombo's Avatar
    tombo Posts: 5, Reputation: 1
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    #3

    Aug 27, 2006, 05:46 PM
    My apology, I should have mentionted that it is an electric forced air furnace.
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    tombo Posts: 5, Reputation: 1
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    #4

    Aug 27, 2006, 05:47 PM
    It is an electric furnace.
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
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    #5

    Aug 27, 2006, 05:51 PM
    Is it only heat and cool? A heat pump will heat and cool but is backed by electric(gas & Oil,also)
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
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    #6

    Aug 27, 2006, 05:59 PM
    Normally red=R(24V power on stat, grn= G to fan relay, WhiteW= heat, Yel=Y cooling contactor. What terminals were the colors on on the olsd stat? Org is usually o on stat to energise rev valve and the blk could be common. Possibly need to see haw the air handler is wired to be for sure
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