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

    May 16, 2010, 02:32 PM
    Can I use a 4 wire thermostat on a 2 wire system
    I have an older mobile hm with a coleman/intertherm heat/a/c it's a 2 wire system, I have a brand new hunter 42999B thermostat which is either a 4 or 5 wire should this work, attatching black wire to RH and white wire to W ? Thanks
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    May 16, 2010, 06:19 PM
    Wires to rh and w will/should make the furnace/heat work,, you need 2 more wires to make an ac work
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