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    wyn626's Avatar
    wyn626 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 5, 2009, 03:48 PM
    Change speed on motor wiring.
    I have a lennox central air m\n gcs 20--- had a new motor installed about a two years ago
    The fan motor is set on high,with wires do I need to change to get a med-speed.
    Thank you.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 5, 2009, 04:13 PM
    There are about 15 different motor manufactures for furnaces/HVAC units. Usually the wiring colors for speeds will be the same but would not chance it. There is a wiring diagram on Every motor printed on the side. You might have to pull the motor to see the diagram unless you have a exact model and brand name so I can look it up. Sometimes they will put the numbers on the bill for service you had 2 years ago. Use bottom for PSC motors

    Normal standard colors are in the file below
    Attached Images
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    2. dac122's Avatar
    dac122 Posts: 463, Reputation: 17
    Full Member
    		  
    #3

    Jul 6, 2009, 05:48 AM

    Just curious, why do you want to reduce your motor speed?
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