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  1. #1
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    140

    walk in freezer not going into defrost

    what would cause my compressor to keep runing while in defrost , this is a pumpdown system. changed time clock twice still same problem

  2. #2
    Join Date
    Oct 2012
    Location
    Torrington CT
    Posts
    82
    did you have your gages on the system if it was pumping down you would see the low side drop and the high side would go i know this might be basit but if that does not happen the liquid line secanord might not be closing

  3. #3
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    bad pump down solenoid or low pressure cut out. have to put your gauges on it to know which. contactor could also be welded closed.

    dont just throw parts at it, troubleshoot it.

  4. #4
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    140
    so if my low pressure control doesnt go off on low pressure my compressor will continue to run preventing my defrost from coming on ?

  5. #5
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,832
    contactor stuck?
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  6. #6
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    Quote Originally Posted by royd2 View Post
    so if my low pressure control doesnt go off on low pressure my compressor will continue to run preventing my defrost from coming on ?
    If your clock is energizing the heaters youll be heating and cooling at the same time.

  7. #7
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    140
    thanks ar. i am posting this after the fact as i tried to tell the senior tech to check solonoid and pressure cut out. i quess what i am asking is if my compressor never shuts off my time clock will never allow my defrost heaters to come on correct?

  8. #8
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,832
    defrost timer de-energizes ll solenoid valve and then compressor will run until pressure switch opens.
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  9. #9
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    Quote Originally Posted by royd2 View Post
    thanks ar. i am posting this after the fact as i tried to tell the senior tech to check solonoid and pressure cut out. i quess what i am asking is if my compressor never shuts off my time clock will never allow my defrost heaters to come on correct?
    Compressor shutdown doesnt initiate defrost, your clock does. Your compressor could continue to run while your heaters are energized.

  10. #10
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    140
    ok but does the defrosters come on instantly ?

  11. #11
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    140
    ok thats what i thought so we need to check our elements and solonoid and pressure cut out then.

  12. #12
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    140
    could a bad defrost termination switch also cause my heaters to not come on ?

  13. #13
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    Put guages on it. Turn the clock to initiate defrost. Watch gauges. It should pump down. If it pumps down and doesnt shut off, your contactor is stuck or your low pressure cutout is bad. If it never pumps down, ll solenoid is bad. OR its wired wrong.

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