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  1. #1
    Join Date
    Oct 2003
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    tidewater, va
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    CGAE pumpdown timer fault

    CGAEC404, ser# J96M84073. circuit 2 frequently violates the pumpdown timeout circuit safety. never can catch it doing it and have changed out the LP switch thinking it was hanging up. Still happens and am about to change the liquid line solenoid valve out. anyone deal with this issue before?


    r404a

  2. #2
    Join Date
    Jan 2012
    Location
    Perth Down Under
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    26
    Just so that we are talking about the same machine is the CGAE a 2 circuit, reciprocating air cooled chiller with up to 2 comps per circuit? If so has it a RCM control module?

  3. #3
    Join Date
    Oct 2003
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    tidewater, va
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    gear drive,
    two scrolls per circuit


    r404a

  4. #4
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
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    4,440
    just so that we are talking about the same thing...

    While in pumpdown mode, the Low Pressure Cutout (LPC) did not open in 30 seconds so Compressor A was shut down anyway. LPC may be defective, LL solenoid valve either leaks or is not closing.

    this diagnostic?
    How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...

    1. Remove your meter leads from the meter and very carefully return them to their storage case or bag.
    2. Wait 2 seconds
    3. Very carefully remove your meter leads from their storage place and enjoy your new knot!

  5. #5
    Join Date
    Oct 2003
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    tidewater, va
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    Thats it Jay. i am leaning toward solenoid valve intermittingly leaking by. I think I will change it out. thanks for the replies


    r404a

  6. #6
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,440
    don't rule out a bad low pressure switch (or somebody is 'monitoring' it), solenoid valves that have been moved and they are farther away than normal, solenoid valves that have someone else controlling them (bad, bad BAS technician!), low to very low suction superheat or high head pressure possibly due to overcharge, non-condensibles, etc.
    How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...

    1. Remove your meter leads from the meter and very carefully return them to their storage case or bag.
    2. Wait 2 seconds
    3. Very carefully remove your meter leads from their storage place and enjoy your new knot!

  7. #7
    Join Date
    Oct 2003
    Location
    tidewater, va
    Posts
    2,144
    thanks for the input jay


    r404a

  8. #8
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,440
    oh! and i thought of another thing last night...perhaps you have a compressor that is not pumping very well, especially at high pressure differentials.
    How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...

    1. Remove your meter leads from the meter and very carefully return them to their storage case or bag.
    2. Wait 2 seconds
    3. Very carefully remove your meter leads from their storage place and enjoy your new knot!

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