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Tech Challenge January 2021

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A beer cooler utilizing R-134a with a TXV metering device with receiver, has a customer complaint of “warm product.” The symptoms confirm warm beer and the condensing unit is cycling frequently on the LPC (low pressure control). With only one problem intended, what are the “possible causes” with the following measured conditions on this field service check sheet?

Field Service Check Sheet

Compressor Discharge Temp.  193 deg. F
Condensing Press./Temp.  108 psig / 93 deg. F.
Condensing Outlet  78 deg. F.
Condenser Sub cooling  17 deg. F.
Condenser Split  18 deg. F.
Entering Feed Device Temp.  41 deg. F.
Evaporator Press./Temp.  3 psig / -7 deg. F.
Evaporator Outlet Temp.  37 deg. F.
Evaporator Superheat  30 deg. F.
Evaporator Split  37 deg. F.
Compressor Inlet Temp.  68 deg. F.
Total S. H.  61 deg. F.
Ambient Temp.  75 deg. F.
Room/Box Temp.  52 deg. F
Compressor Volts  240 V.
Compressor Amp. Draw LOW

Check back on January 31, 2021 for the answer to this Tech Challenge.

Posted In: ACCA Now, Tech Challenge

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