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

    Mar 26, 2008, 04:43 AM
    Wiring a thermostat
    I am replacing a thermostat and the 1 being replaced has 4 wires on it but the new thermostat only has 2... do I connect the whites together and run the 2 blacks from the thermostat to complete the circuit?
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Mar 26, 2008, 04:53 AM
    Quote Originally Posted by artosie
    I am replacing a thermostat and the 1 being replaced has 4 wires on it but the new thermostat only has 2... do I connect the whites together and run the 2 blacks from the thermostat to complete the circuit?
    Without more details on the thermostats it is difficult to say.
    It seems to me that the one you want to install is a either a simple (mercury or spring) model, or a digital one.
    The digital thermostate may be polarisation sensitive, so be careful.
    As to the wires to be used : it depends on what type the old thermostate is, and where it is using these 4 wires for...
    ;)
    artosie's Avatar
    artosie Posts: 5, Reputation: 1
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    #3

    Mar 26, 2008, 05:03 AM
    The box which houses the thermostat has 2 lines running into it,
    1 from the electrical panel and 1 to the heater.
    The thermostat being removed is a spring type and has the 2 blacks on one side and the 2 whites connected to the other side of it... the thermostat being installed is a spring type and has the 2 wires out the back of it.
    For previous heaters I have installed I completed the circuit by connecting the blacks to the thermostat and joined the whites together. I hope this explains it a little better
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #4

    Mar 26, 2008, 06:44 AM
    artosie, sounds like your method should work.
    artosie's Avatar
    artosie Posts: 5, Reputation: 1
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    #5

    Mar 26, 2008, 06:58 AM
    Great! I am going to try it in an hour... I will reply here and let you know if it worked..

    Thanks again
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #6

    Mar 26, 2008, 07:37 AM
    Do you have both heat and AC in your home? I think you bought the wrong stat if your old one had 4 wires. This may help but please answermy question. https://www.askmehelpdesk.com/heatin...tml#post268211
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #7

    Mar 26, 2008, 12:39 PM
    Ballenger, I was thinking the same thing, but since he said 2 in and 2 out, Not 4 in, was thinking more Line in and load out. I'm thinking this is #12 or bigger, not Control wires.
    Curious if he has Heat and Cooling, and size of the wires. Take Care
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