January 2015 IE3 Tech Challenge


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A medium temperature cooler utilizing R-134a with a TXV metering device with receiver, has a customer complaint of “warm product.” The symptoms confirm warm product and the condensing unit is cycling frequently on the 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. 192 deg. F.
Condensing Press./Temp. 108 psig / 93 deg. F.
Condensing Outlet Temp. 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.
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

Posted In: ACCA Now, Tech Challenge

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