Results 1 to 8 of 8
  1. #1
    Join Date
    Oct 2003
    Location
    tidewater, va
    Posts
    2,140

    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
    Posts
    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
    Location
    tidewater, va
    Posts
    2,140
    gear drive,
    two scrolls per circuit


    r404a

  4. #4
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,388
    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?
    When I am late for work, I usually make up for it by leaving early.

  5. #5
    Join Date
    Oct 2003
    Location
    tidewater, va
    Posts
    2,140
    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
    4,388
    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.
    When I am late for work, I usually make up for it by leaving early.

  7. #7
    Join Date
    Oct 2003
    Location
    tidewater, va
    Posts
    2,140
    thanks for the input jay


    r404a

  8. #8
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,388
    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.
    When I am late for work, I usually make up for it by leaving early.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event