Walk in cooler trouble - Page 2
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  1. #14
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    789
    Lots of walk-in coolers have off-cycle defrost timers.

  2. #15
    I have never seen a defrost timer in a walk in cooler, it should just be an off cycle defrost?

  3. #16
    Join Date
    Feb 2010
    Location
    Newnan Ga,
    Posts
    77
    Heatcraft puts defrost Grassilin clocks in all of their medium temp condensing units unless its a beer cooler we dont hook to them mostly because the worst thing one can do is loop a contactor coil through one of these. Does anyone know why its bad practice?

  4. #17
    Join Date
    May 2005
    Posts
    1,347
    no do tell cause i just did a install on a very large beer walk in and the timer is in the walkin..
    Let's give nukes a chance.

  5. #18
    Join Date
    Jul 2010
    Location
    So-Cal
    Posts
    576
    I'v added timers to coolers a few times! Nimrods wont keep the door closed.

  6. #19
    Join Date
    Jan 2010
    Posts
    5,949
    Quote Originally Posted by Grayline View Post
    Does anyone know why its bad practice?
    Are you asking because you know or don't know ?

  7. #20
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    789
    It isn't bad practice. There are thousands and thousands of coolers running this way. Also, the timer usually cuts the LL solenoid, not the contactor.

    Sent from my ADR6350 using Tapatalk 2

  8. #21
    Join Date
    Jan 2010
    Posts
    5,949
    Quote Originally Posted by MicahWes View Post
    Also, the timer usually cuts the LL solenoid, not the contactor.

    Sent from my ADR6350 using Tapatalk 2
    This would be true if the timer is located near the solenoid valve. Quite often I see the valve in the evaporator unit and the timer at the condensing unit with no interconnecting wiring.

  9. #22
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,711
    I want to know what the problem was that caused the OP to post this thread......!
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  10. #23
    Join Date
    Oct 2008
    Location
    mid-Tennessee
    Posts
    677
    Quote Originally Posted by timebuilder View Post
    I want to know what the problem was that caused the OP to post this thread......!
    Was in a defrost cycle?


    "You never know what others don't know." -

  11. #24
    I know it has been a long time since I have posted but the call never came back in, until last night. Unit was short cycling, so again, grab the gauges and pump just a little 404 in to rise the pressure. Then I noticed the suction valve was bubbling like crazy, tightened down the packing nut and it stopped.

    I realize that 404 is a blend and there might be some issues down the road with refrigerant separation ( the proper term escapes me for the moment), but at least a leak was found, and yeah, no issues since that timer was reprogrammed, which I just eliminated it all together last night

  12. #25
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    789
    Are you talking about the suction service valve? It probably didn't leak when properly back-seated.

    If this was indeed the only leak, and it was on suction side, you won't have any fractionation problems with the remaining charge.

  13. #26
    Join Date
    Jul 2010
    Location
    So-Cal
    Posts
    576
    Yes alot of times they will leak around the stem when you open the valve. You need to check it when you close it (back seated) If you dident then you might have a leak else where.

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