Tech Challenge – March 2018
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A split air conditioner utilizing R-410A with a TXV feed device (and receiver) has a customer complaint of “warm, no cooling.” The symptoms confirm inadequate cooling and the compressor appears to be running all of the time and the thermostat is not satisfied. What are the “possible causes” (Note:There is only one problem intended) with the following measured conditions on this field service check sheet?
Field Service Check Sheet
| Compressor Discharge Temp. | 230 deg. F. |
| Condensing Press./Temp. | 296 psig / 95 deg. F. |
| Condensing Outlet | 82 deg. F. |
| Condenser Sub cooling | 13 deg. F. |
| Condenser Split | 10 deg. F. |
| Entering Feed Device Temp. | 85 deg. F. |
| Evaporator Press./Temp. | 101 psig / 32 deg. F. |
| Evaporator Outlet Temp. | 52 deg. F. |
| Evaporator Superheat | 20 deg. F. |
| Compressor Inlet Temp. | 75 deg. F. |
| Total S. H. | 43 deg. F. |
| Ambient Temp. | 85 deg. F. |
| Room/Box Temp.34 | 80 deg. F |
| Compressor Volts | 240 V. |
| Compressor Amp. Draw | Low |
Looking for the answer? Check hvac-blog.acca.org on March 29, 2018, for the answer to this issue’s Tech Challenge.
Posted In: ACCA Now, Tech Challenge
