A Roof top system utilizing R-22 with a fixed orifice-metering device has a customer complaint of “no cooling.” The symptoms at the customer’s office confirm that the thermostat is not satisfied and the compressor, condenser fan, and blower are running continuously. What are the “possible causes” using the following measured conditions on this field service check sheet?
Field Service Check Sheet
Compressor Discharge Temp. | 210 deg. F. |
Condensing Press./Temp. | 182 psig / 95 deg. F. |
Condensing Outlet Temp. | 87 deg. F. |
Condenser Sub cooling | 8 deg. F. |
Condenser Split | 10 deg. F. |
Entering Feed Device Temp. | 86 deg. F. |
Evaporator Press./Temp. | 82 psig / 49 deg. F. |
Evaporator Outlet Temp. | 65 deg. F. |
Evaporator Superheat | 16 deg. F. |
Compressor Inlet Temp. | 78 deg. F. |
Total S. H. | 27 Deg. F. |
Ambient Temp. | 85 deg. F. |
Room/Box Temp. | 80 deg. F. |
Compressor Volts | 240 V. |
Compressor Amp. Draw | Low |
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