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Thread: York YMC2 “ Loss of Subcooler Liquid Seal”

  1. #1
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    York YMC2 “ Loss of Subcooler Liquid Seal”

    I know it’s a warning, I tried to make sense on the description, it says.
    )Condenser Sat. temp. - Drop leg Ref. Temp.) / (cond sat temp - Entering Condenser Liquid Temp.)
    Did anybody saw this alarm before?
    And what are they referring to Drop Leg Ref Temp.?

  2. #2
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    There is a temperature sensor on the liquid line coming out of the bottom of the condenser heat exchanger.


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  3. #3
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    Thread Starter
    So that’s the leg.
    Have you run into this warning before?

  4. #4
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    Thread Starter
    Thank you

  5. #5
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    Not worked on that unit, but my guess is subcooled refrigerant is required for motor cooling, charge low or evap level high.

  6. #6
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    Yes have run into it before. Check calibration of level sensor and charge. Could be chilled water loop issues, flow or too low return temperature. There has to be enough gas moved to the condenser to get stacked in the sub-cooler.


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  7. #7
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    You have 3 sensors there...make sure they are accurate.

  8. #8
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    Thread Starter
    I’ll check that, thank you Chev and jay!

  9. #9
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    The reason for the alarm is because you need to ensure you always have a liquid level in the Condenser to ensure you are always feeding liquid refrigerant to the falling film evaporator , at very low load you may not have enough refrigerant flow to build up a liquid seal in the condenser, what is the 'minimum VGD' setting in the software, you may need to adjust this to approx 5% , Capacity Control screen, setpoints , change setpoints , keep an eye on the Evaporator Small temp Diff too, and check operation of the Level Control Valve, if you are short of refrigerant this may cause an issue or if the Level Control Valve is not closing down enough or if the level was set too high, it should be set to maintain a constant 50% level visually in sightglass regardless of what that means in the Level setpoints.

  10. #10
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    Thread Starter
    Hello Guys
    I am trying to change the Coolant on a YKPBPSK2-FAGS
    How can I operate the coolant pump?
    In the past with old York I would energize the pump by isolating it, I hope that in the new ones will have that feature


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  11. #11
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    May 2012
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    Start a new thread how would you run the pump by isolating it?

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