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  1. #1
    Join Date
    Nov 2009
    Posts
    37

    Walk in Solenoid noise

    Installed a walk in freezer last week and the customer has asked to make into a cooler instead. (Unit had been used in another location prior to this installation)

    Ive had a few problems changing unit freezer over to cooler,

    Found unit was pumping down due to a restriction at solenoid inlet (piece of rubber).
    Removed restriction and opened valves after evac and then removed timer pins and wired evap fans so I wouldn't have a fan delay on start-up.


    Run tested unit to see if it would shut off on thermostat A419 johnson controls.
    When stat satisfied solenoid would start bouncing making a racket, removed wires from solenoid ohmed out, checked to ground it's fine electrically with full 240v during call for cooling. But once the thermostat was satisfied and closed it would bounce and rattle until i brought the temp down to call and open solenoid.

    Ive opened solenoid a few times and flushed LL with nitro to clear any debris.

    Im thinking maybe seat of the solenoid valve is gone and compressor is forcing liquid through a slighting opened seating of the valve.

    Any ideas?

  2. #2
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Does it pump down? I'm guessing not. Your probably on the right track.

  3. #3
    Join Date
    Nov 2009
    Posts
    37
    Does not pump down. I'm guessing that it is attempting to once stat has satisfied.

  4. #4
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,064
    its backwards

  5. #5
    Join Date
    Sep 2003
    Location
    North-Central Ohio
    Posts
    22
    Found unit was pumping down due to a restriction at solenoid inlet (piece of rubber).

    >First warning sign - any more rubber/debris still floating around?

    Ive opened solenoid a few times and flushed LL with nitro to clear any debris.

    >As above - if chunks are stuck between needle and seat the nitrogen may not be able to flush it through the valve.

    Im thinking maybe seat of the solenoid valve is gone and compressor is forcing liquid through a slighting opened seating of the valve.

    >inspect needle/seat/spring and if that's not it check what Phase Loss said and make sure it's installed with the right flow direction.

    Any ideas?[/QUOTE]

  6. #6
    Join Date
    Nov 2009
    Posts
    37
    Yes it's installed correctly with spring seat and needle in correct position and facing installed in the right direction.

  7. #7
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    Quote Originally Posted by Phase Loss View Post
    its backwards
    backwards or trashed. stick a new one on there

  8. #8
    Join Date
    Nov 2009
    Posts
    37
    Changed out solenoid. Stop the banging then found TXV screen had disintegrated im guessing from what ever was floating around in system and had caused restriction in TXV causing it to pump down. Sigh.

    Had an hour and a half drive to supplier then back downtown at 3pm
    Replaced and were off to the race's.

  9. #9
    Join Date
    Apr 2005
    Location
    Australia : Queensland
    Posts
    795
    Have seen this on small cabinet freezers , from manufacture new solenoid hammering hot gas to coil , spring tension on danfoss valve incorrect , hence not seating correct.
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

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