Tech Challenge March 2021


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A medium temperature cooler utilizing R-134a with a capillary tube feed device has a customer complaint of warm beer. The symptoms at the convenience store confirm inadequate cooling and the compressor appears to be short cycling on the high or low pressure control. What are the “possible causes” (Note: There is only one problem intended) with the following measured/calculated conditions on this field service check sheet?

Field Service Check Sheet

Compressor Discharge Temp.  210 deg. F
Condensing Press./Temp.  108 psig / 92 deg. F.
Condensing Outlet  76 deg. F.
Condenser Sub cooling  16 deg. F.
Condenser Split  17 deg. F.
Entering Feed Device Temp.  44 deg. F.
Evaporator Press./Temp.  5 psig / -3 deg. F.
Evaporator Outlet Temp.  37 deg. F.
Compressor Inlet Temp.  68 deg. F.
Total S. H.  71 deg. F.
Ambient Temp.  75 deg. F.
Room/Box Temp.  50 deg. F
Compressor Volts 240 V.
Compressor Amp. Draw LOW

Check back on April 1, 2021 for the answer to this Tech Challenge.


Posted In: ACCA Now, Tech Challenge

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