Tech Challenge July 2019

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A freezer utilizing R-22 with a TXV metering device (and receiver) has a customer complaint of “warm case.” The symptoms at the store confirm that the case that normally operates about 0 degrees is 34 degrees and the condensing unit is running continuously. What are the “possible causes” (note: there is only one problem intended) with the following measured conditions on this field service check sheet? 

Field Service Check Sheet

Compressor Discharge Temp.  240 deg. F
Condensing Press./Temp. 168 psig / 90 deg. F.
Condensing Outlet  87 deg. F.
Condenser Sub cooling  3 deg. F.
Condenser Split  5 deg. F.
Entering Feed Device Temp.  86 deg. F.
Evaporator Press./Temp.  39 psig / 16 deg. F.
Evaporator Outlet Temp.  38 deg. F.
Evaporator Superheat  22 deg. F.
Compressor Inlet Temp.  54 deg. F.
Total S. H.  38 deg. F.
Ambient Temp.  85 deg. F.
Room/Box Temp.  34 deg. F
Compressor Volts  240 V.
Compressor Amp. Draw  Low


Posted In: Tech Challenge

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