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

July 2017 Tech Challenge

A freezer utilizing R-402A 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?et?

Field Service Check Sheet

Compressor Discharge Temp. 240 deg. F.
Condensing Press./Temp. 204 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. 48 psig / 14 deg. F.
Evaporator Outlet Temp. 36 deg. F.
Evaporator Superheat 22 deg. F.
Compressor Inlet Temp. 54 deg. F.
Total S. H. 40 deg. F.
Ambient Temp. 85 deg. F.
Room/Box Temp.34  deg. F
Compressor Volts 240 V.
Compressor Amp. Draw Low


Looking for the answer? Check www.ie3media.com on August 30, 2017, for the answer to this issue’s Tech Challenge.

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