A commercial rooftop with R-410A refrigerant and a fixed orifice feed device has a customer complaint of insufficient cooling. The symptoms confirm a warm space and the compressor appears to be running continuously. What are the “possible causes” with the following measured conditions on this field service check sheet? (Note: There is only one problem intended.)
Field Service Check Sheet
- Compressor Discharge Temp. 205 deg. F.
- Condensing Press./Temp. 338 psig / 104 deg. F.
- Condensing Outlet Temp. 90 deg. F.
- Condenser Sub cooling 14 deg. F.
- Condenser Split 16 deg. F.
- Entering Feed Device Temp. 50 deg. F.
- Evaporator Press./Temp. 55 psig / 32 deg. F.
- Evaporator Outlet Temp. 68 deg. F.
- Evaporator Superheat 36 deg. F.
- Compressor Inlet Temp. 78 deg. F.
- Total S. H. 46 Deg. F.
- Ambient Temp. 88 deg. F.
- Room/Box Temp. 80 deg. F.
- Compressor Volts 240 V.
- Compressor Amp. Draw Low
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