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    billy6139's Avatar
    billy6139 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 8, 2013, 04:32 PM
    Coleman 7900 series standing pilot furnace. Connect to wi fi thermostat
    Have a coleman 7900 gas fired heat/cool unit in mobile home. Just installed Honeywell wifi thermostat. I only have 4 wires to t stat. they told me to move the G wire to common on both ends and it will work. Heat works OK but when in cooling mode , compressor comes on but fan does not. The wi fi requires a common wire at the t-stat. If I run a wire (temporarily) from the common side of the 24vac xfmr to the C terminal on the t-stat(and leave the G wire in the G terminal on the stat) everything works fine. Any suggestions without having to do major work and pull in new wires. Honeywell can't helpl
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Feb 8, 2013, 07:50 PM
    Sorry, but you are going to have to pull another wire, or at this point pull a five wire stat cable. With your stat, and having heat and a/c, you need a five wire cable. There are some products out there that say they can make a four wire into a five wire, but I have not seen, nor dealt with them. If you are interested, look into "venstar Add a Wire". May be just what you are looking for. The wiring is pretty straight forward as long as you can interpret the wiring diagram and instructions.
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