dafoss low-pressure
Differential setting on low pressure control too low. Solution: Area Low pressure System Part Compressor Symptom Compressor running time too short Potential Cause Differential setting on low pressure contol too low. Solution Increase the differential setting
High-pressure control setting too low,i.e.too close to normal operating pressure. Area Low pressure System Part Compressor Symptom Compressor running time too short Potential Cause High-pressure control setting too low,i.e. too close to normal operating pressure. Solution Check the high-pressure control setting.Increase it if the system data allows.
Condensing pressure too high because of: A)Dirty/clogged condenser surfaces. B)Fansstopped/water supply failure.c C)Defective phase/fuse,fan motor.Too much refrigerant in system. D)Air in system.
Area Low pressure System Part Compressor Symptom Compressor running time too short Potential Cause Condensing pressure too high because of: A)Dirty/clogged condenser surfaces. B)Fans stopped/water supply failure. C)Defective phase/fuse,fan motor.Too much refrigerant in system. D)Air in system.
Solution Rectify the stated faults.
2.Liquid hammer in compressor Expansion valve capacity too large. Solution Area Low pressure System Part Compressor Symptom Liquid hammer in compressor Potential Cause Expansion valve capacity too large. Solution Replace expansion valve or orifice with smaller size.Reset superheat on expasion valve if necessary.
Superheat on expansion valve set too low. Area Low pressure System Part Compressor Symptom
Liquid hammer in compressor Potential Cause Superheat on expansion valve set too low. Solution Increase superheat on expansion valve.
Expansion valve bulb not in good contact with suction line. Area Low pressure System Part Compressor Symptom Liquid hammer in compressor Potential cause Expansion valve bulb not in good contact with suction line. Solution Ensure that bulb is secured on suction line.Insulate bulb if necessary.
Bulb located too warm or near large valves,flanges,etc. Solution Area Low pressure System Part’Compressor Compressor Symptom Liquid hammer in compresor Potential Cause Bulb located too warm or near large valves,flanges,etc. Solution Check bulb location on suction line.Move bulb to better position.
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