If you're on a commercial refrigerator troubleshooting call and the compressor is running with low amp draw, low suction pressure and low discharge pressure, you may have a low charge, or a restricted liquid line, drier, or metering device. Check the superheat and subcooling, and make the necessary repairs.
Capacity Versus Line Pressure Drop Vapour Lines No line loss 2F º Suction line 2F º Hot gas discharge line 4F º Suction line 4F º Hot gas discharge line Capacity % 100.0 95.7 98.4 92.2 96.8 HP/Ton % 100.0 103.5 103.5 106.8 106.8 Liquid Lines Pressure drop not as critical as in vapour lines. Pressure drop should not cause: • vapour ...