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Liquid entering the compressor

Kpit
Kpit Member Posts: 3
in A-C, Heat Pumps & Refrigeration

I have faced a issue of liquid entering the compressor and compressor amps goes to 214.

Actually it is a Blast freezer system with screw compressor.

Machine was working fine and achieving its required temperature as per set point. But after the defrost cycle when the system restarted again we hear a noise from the compressor and amps goes to 214.

can you please suggest what could be the reason?

Comments

  • Ironman
    Ironman Member Posts: 7,537

    What’s the superheat during normal operation?

    Does the system have a suction accumulator?

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • clammy
    clammy Member Posts: 3,156
    edited July 30

    Does this system contain a liquid line solenoid and does it go into a pump down for defrost .I believe i would take a look at the solenoid valve is holding . Also does this unit has any sort of capacity control like unloaders as to not load the compressor on start up which may increase your start up amp draw . Also is this a direct expansion refrigeration or is this used to chill another medium ? Other things to look at would be is there a start contact and run set of contacts some larger semi hermetic compressor are set up this way ,is this compressor again using unloaders as capacity control . Good contactors not carboned up or pitted and that voltage is with in what is required by the equipment and that upon start up voltage does not drop to low ,again check all wiring connections included contactors and compressor terminals . worse comes to worse contact the manufacturer or who ever does your maintenance. Is this a air cooled system or using a tower ? Also does the compressor have a crank case heater if so is it working .

    peace and good luck clammy

    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,363

    Screw compressors are a different animal. They can tolerate some liquid. But the amperage rise show it is getting too much and will eventually damage the compressor if this is not corrected.

    You need to consult with the MFG of the chiller and have them review the application of the chiller and make some recommendations.

  • Kpit
    Kpit Member Posts: 3

    @Ironman

    during normal operation superheat was 8.4

    Yes the system have suctional accumulator.

  • pecmsg
    pecmsg Member Posts: 5,271

    8.4 at the compressor?

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