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  • Why is the top rim on prep cooler not getting cold?

     mewservices updated 10 months, 1 week ago 5 Members · 12 Posts
  • guest

    December 22, 2018 at 12:00 am

    Have a prep cooler with drawers in the bottom. Bottom of cooler where drawers are is 33°. The top where you put your containers is 60+ degrees. The solenoid that sends refrigerant up to the rim of the top parts is opening and is sending refrigerant but it’s not get cold up there. 

  • ectofix

    December 23, 2018 at 4:36 pm

    The “top rim” (as you called it) is called a COLD RAIL.


    Could you please at least offer up some idea of who makes the one you’re referring to?  A model number would be nice too.

  • fixbear

    December 23, 2018 at 5:10 pm

    Not knowing your make and model puts me at a handicap,  But the fact that it has a separate refrigeration circuit for the top rail means it’s a high end top.  Are all spaces full of pans?  They do not cool correctly if you leave one or 2 out.  Possible causes of your problem are that the condenser is not cooling enough or your charge is low.  Check your condenser fan and the air flow through the condenser.  Feel the liquid line at the bottom of the condenser or the filter dryer for temperature.  If near room temp you’ll need to check the charge.  If hot you lack air flow though the condenser.  This can be dirt in the condenser or fan not to speed.(bearings).


    All this depends on the lower box being at the correct temp first. And that the thermostats are working correctly.

  • fixbear

    December 24, 2018 at 6:16 am

    I forgot to mention to check the upper temp control. If there is no call for cooling, it won’t cool.  Unfortunately I don’t have a clue as to what type of cold control you happen to have.

  • henry

    January 31, 2019 at 7:17 pm

    Yes if you give me a make and model I may be able to help you out but the first thing to do is check and see if the solenoid is energized

  • mewservices

    January 31, 2019 at 10:30 pm

    I put a new solenoid valve and TXV on it because the solenoid wasn’t working and I figured while I had it evacuated I might as well put a new TXV on it as well. The valve is energized and you can feel the refrigerant going by but it’s just not getting into the top rim(coils) in the top part. Bottom works great.

    Here is a picture of the tag unfortunately the model number is not readable but the serial is.

    Thank You so much!!!




    Martin Wright/ Owner of M.E.W Services

    -HVAC-R Technician

    -Commercial Appliance Technician

    -Foodservice Equipment Technician

    -Residential Appliance Technician



    (315) 573-5700

  • mewservices

    January 31, 2019 at 10:40 pm

    Well I guess I can’t attach a picture. So anyway it’s a Delfield and it’s a S/C refrigerated base and reduced height rail. Like I said model number is no longer there but serial is 0506036001668M

    134A- 32oz

    Thanks again!!

  • fixbear

    February 1, 2019 at 6:22 am

    Tubing resriction like a pinch or bend for the top rail.

  • mewservices

    February 1, 2019 at 7:29 am

    I didn’t see anything 

  • fixbear

    February 1, 2019 at 7:55 am

    Usually where the tubing enters or exits the case.  What is the refrigerant and what refrigerant was it built with.  Sometimes they get a oil lock from congealing oil incompatibility or to much oil in the system.


    Adjusting the TXV on a parallel evaporator system is also a bit difficult.

  • ectofix

    February 1, 2019 at 7:57 am

    Well then, maybe…

    – a blob of sil-foss restricting flow?

    – the new TXV is out of adjustment or possibly damaged during installation (brazed in?)?

    – the new TXV bulb is improperly mounted?

    – the new solenoid valve was maybe damaged during installation (brazed in?)?


    Are you seeing any frost on the line feeding the cold rail?

  • mewservices

    February 1, 2019 at 8:31 am


    I’LL check for kinks when I go back.

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