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  1. #1
    Join Date
    Nov 2012
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    Compressor overload alarm on Mcquay

    I am working on some mcquay McQuay Heat Pump - R134a HPI 109.2 SE ST but in one of them i am having a problem from some days. After 1 or 2 hours of work one circuit of them is going on alarm for : "Comp overload" in circuit 2 alarm on board and "motor temp high" on remote controller (bms) . I have checked r134 gas is ok , high an low pressure are ok, checked also the solenoid valve on of liquid ignition of compressor is ok. Now is running in heat , i try to also in cooling mode but problem is the same. I was there for a control and i have seen the discharge on about 180 degree Fahrenheit increased to 185 degree Fahrenheit , 1 minute after compressor trip for compressor overload.

    Any idea?

    Thank you fro your time

  2. #2
    Join Date
    May 2000
    Salem, WI US
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    How's rated versus actual amps?
    Superheat? Subcooling?

    Success is to be measured not so much by the position that one has reached in life as by the obstacles which he has overcome.

  3. #3
    Join Date
    Mar 2013
    Central IL
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    check amp draw on compressor, sounds like it is running hard. If pressures remain constant till compressor trips out, it is probably going to loose compressor soon.

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