Tech Challenge - January 2019 - IE3: Business Tools for HVAC & Plumbing Contractors  

Tech Challenge – January 2019

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 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. 190 deg. F
Condensing Press./Temp. 105 psig / 90 deg. F.
Condensing Outlet 77 deg. F.
Condenser Sub cooling 13 deg. F.
Condenser Split 15 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

Looking for the Answer: Check on February 28, 2019, for the answer to this issue's Tech Challenge.

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