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

    May 22, 2007, 09:18 AM
    Running Fan Manually from Thermostat
    I have an Intertherm model MMHB-070ABHR gas furnace.

    I am replacing the old mechanical thermostat which did not have a fan on switch with a digital thermostat.

    The wiring to the thermostat now has only 2 wires. Which wire on the furnace do I wire to so that I can use the fan control on the thermostat?

    The unused wires on the furnace are green and yellow.
    JackT's Avatar
    JackT Posts: 260, Reputation: 19
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    #2

    May 22, 2007, 01:11 PM
    In order to use the FAN switch on your thermostat, you'll need at least 3 conductors. The third wire will be needed to connect the G terminal on your thermostat to the fan relay.
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