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    Tinker217's Avatar
    Tinker217 Posts: 1, Reputation: 1
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    #1

    Jul 27, 2007, 01:43 PM
    Wiring inline duct fan to furnace fan goodman gmp100-4
    How do I wire my inline duct fan to my Goodman model gmp100-4 gas furnace fan so that the inline duct fan comes on and off when the furnace fan does?
    I understand that I need a relay from the inline duct fan but don't know where to connect the relay to the furnace.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #2

    Jul 27, 2007, 03:53 PM
    I assume you only want to run the fan in air conditioning, correct?
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #3

    Jul 27, 2007, 04:51 PM
    If you chose to have the duct fan run at all times when the fan in the furnace ran then one method would be to install a sail switch (as air blows through the duct it pushes against the sail and closes the switch) in the duct work , the switch would then make the circuit to the fan. You could also use a pressure switch that would bring on the fan when there is static pressure in duct.
    I mention these ways because most furnaces have two or more speeds and just wiring to the fan relay would not bring it on in heat mode,
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