January 2017 Tech Challenge - IE3: Indoor Environment & Energy Efficiency

January 2017 Tech Challenge

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A Coca Cola cooler utilizing R-134a with a TXV metering device with receiver, has a customer complaint of “warm pop.” 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. 185 deg. F.
Condensing Press./Temp. 106 psig / 91 deg. F.
Condensing Outlet Temp. 78 deg. F.
Condenser Sub cooling 13 deg. F.
Condenser Split 16 deg. F.
Entering Feed Device Temp. 43 deg. F.
Evaporator Press./Temp. 5 psig / -4 deg. F.
Evaporator Outlet Temp. 38 deg. F.
Evaporator Superheat 42 deg. F.
Compressor Inlet Temp. 68 deg. F.
Total S. H. 72 deg. F.
Ambient Temp. 75 deg. F.
Room/Box Temp. 52 deg. F
Compressor Volts 240 V.
Compressor Amp. Draw  Low

Looking for the answer? Check www.ie3media.com on February 28, 2017 for the answer to this issue’s Tech Challenge.

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