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    jond122's Avatar
    jond122 Posts: 4, Reputation: 1
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    #1

    Jul 18, 2009, 09:52 PM
    Wiring thermostat hot water heat
    I have hot water heat. There is a register in my garage with a fan attached to circulate the heat. There are currently 2 thermostats (one for the fan and one to call for heat). I would like to put one thermostat on that can run the fan as well as call for the heat.

    There is a red and a white coming from the fan transformer. There is also a red and white coming from the furnace to call for heat.

    I have a one stage thermostat which calls for a red, yellow, green and white wire. Which terminals on the thermostat (Y - G - W - R) are for the furnace and which is for the fan? Which is hot and ground for each?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Jul 18, 2009, 10:20 PM
    Can your fan be controlled by low voltage 24Volts without using a relay?
    What powers and turns the fan on now?
    Red wire goes to r on tstat ,white wire goes to w on tstat ,this will control your furnace
    jond122's Avatar
    jond122 Posts: 4, Reputation: 1
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    #3

    Jul 18, 2009, 10:45 PM

    The fan is controlled by a low voltage (24 volt) thermostat now. I is a 110v fan. There is a tranformer between the fan and the thermostat.
    ritukuls's Avatar
    ritukuls Posts: 4, Reputation: 1
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    #4

    Jan 9, 2011, 09:13 AM

    Your Furnace wire will go to R and W as polarity doesn't matter
    The fan wire will go to terminals G

    That's All

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