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Thread: Rudd UAND 048JAZ condenser unit doesn't run

  1. #1
    Join Date
    Jun 2015
    Posts
    6

    Default Rudd UAND 048JAZ condenser unit doesn't run

    My Rudd outside condenser unit quit last night. The fan is operating fine. I've checked and there's 120v to each side of the compressor. I've tried to check the capacitor but my readings worry me. The compressor (herm) terminal reads up to about 22.5 and goes to no connection (meaning it has topped out I presume). The fan connection shows no action at all but the fan is running properly so this side of the capacitor must be good. This makes me worry about the compressor value. The capacitor is too difficult to remove to read the values on it unless I feel confident it's the problem.

    Any ideas?

  2. #2
    Join Date
    Feb 2012
    Location
    Welland Ontario
    Posts
    398

    Default

    If it is a 240 volt compressor then check across the compressor not to ground from each line. The 120 volts could be passing through the unit. You might only have 120 volts and not 240 volts.
    Operation Overlord.

  3. #3
    Join Date
    Jun 2015
    Posts
    6

    Default

    Thanks for your reply.

    I guess I have to think about that. The way I check the voltages is at the connector (open circuit), not on the compressor terminals. So the 120 cannot be passing through the compressor.
    Last edited by i_am_jim; 03-14-2016 at 12:50 PM.

  4. #4
    Join Date
    Jun 2015
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    6

    Default

    Okay, I checked across the compressor and it gives 3-4 volts. Which with my limited understanding seems reasonable for the voltage drop across the small compressor resistance.

  5. #5
    Join Date
    Feb 2012
    Location
    Welland Ontario
    Posts
    398

    Default

    When the compressor is supposed to be running you should measure 240 volts across it. if you don't get 240 volts then there is an issue with the mains supply or the control circuitry.
    What voltages do you get across the contactor on the input L1& L2 terminals and output terminals T1& T2?
    Operation Overlord.

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