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.
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