September 2014 Tech Challenge
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A Reach-in Ice Cream Freezer designed to operate at -15 degrees and utilizing R-404A with a liquid receiver and TXV metering device has a customer complaint of “warm product.” The symptoms at the convenience store confirm that soft product of 0 deg. F. and the condensing unit and blower are running continuously. What are the “possible causes” with the following measured conditions on this field service check sheet?
Field Service Check Sheet
| Compressor Discharge Temp. | 230 deg. F. |
| Condensing Press./Temp. | 198 psig / 88 deg. F. |
| Condensing Outlet Temp. | 76 deg. F. |
| Condenser Sub cooling | 12 deg. F. |
| Condenser Split | 13 deg. F. |
| Entering Feed Device Temp. | 77 deg. F. Read just ahead of going into the freezer |
| Evaporator Press./Temp. | 7 psig / -35 deg. F. |
| Evaporator Outlet Temp. | 5 deg. F. |
| Evaporator Superheat | 40 deg. F. |
| Compressor Inlet Temp. | 62 deg. F. |
| Total S. H. | 97 Deg. F. |
| Ambient Temp. | 75 deg. F. |
| Room/Box Temp. | 0 deg. F. |
| Compressor Volts | 240 V. |
| Compressor Amp. Draw | Low |
Looking for the answer? Check hvac-blog.acca.org on November 3, 2014 for the answer to this issue’s Tech Challenge.
Posted In: ACCA Now, Tech Challenge
