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    Izzypop1's Avatar
    Izzypop1 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 12, 2008, 08:09 PM
    How to check a a/c trasformer
    I have a 4 blade a/c transformer. How do you check to see if it is good? It is already off.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 13, 2008, 01:23 AM
    Is this off a HVAC circuit board of furnace?
    If so model number and brand
    dac122's Avatar
    dac122 Posts: 463, Reputation: 17
    Full Member
    		  
    #3

    Nov 13, 2008, 07:08 AM

    Check the side of the transformer as it may show which side is the 120VAC input and which side is the output.

    If it doesn't say you can trace the input wires back through the furnace. Once you know which side is the output (I'm guessing 24VAC) just wiggle back the connectors and put your probes on that side.

    Don't forget you probably have a safety cutoff switch on your furnace that cuts power when the panel is removed. You'll need to press that in to energize the transformer's input.

    If the transfomer is working at all they often times hum a little and build up some heat. That doesn't mean, however, its outputing the correct voltage, just that its not dead.
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