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

    Sep 7, 2011, 05:16 PM
    How do I turn on only the fan on my Coleman 7900 series furnace?
    I want to be able to run only the fan during these hot summer days to cool my manufactured home. When I manually set the thermostat to "fan only", the fan icon shows on the thermostat as though it's operating, but the furnace fan doesn't turn on. I know this can be done as I've done it in other homes I've owned. I did install a new electronic, programmable thermostat last autumn - could this be causing the problem?
    Thanks!
    lilpoppa's Avatar
    lilpoppa Posts: 118, Reputation: 13
    Junior Member
    		  
    #2

    Sep 8, 2011, 02:44 AM
    From what I've found for wiring diagrams, your furnace doesn't have the seperat relay needed for fan only function. It uses a basic two wire thermostat control, not three wire control. Its either on or off no fan only mode. Your local heating and cooling contractor should be able to retrofit a really for fan only operation if you wanted to do that, I wouldn't recommend doing it yourself as damage to you furnace could result.
    Hope this helps
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