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All refrigeration system works like this
Compressor( High pressure, Hot gas refrigerant) > Condenser ( High pressure, Cooled liquid refrigerant) > Drier > Thermo expansion valve ( Low pressure, Cold liquid refrigerant) > Evaporator (Heat exchange takes place here, Low pressure, Hot Gas/Liquid refrigerant) > Compressor
Common problems i can think of.
1) Knocking of compressor indicates that liquid are returning to compressor. ( Clean the evaporator or condenser SW/FW side dirty, (Expansion valve settings)
2) Low suction pressure of compresser ( Refrigerent Top up )
3) Icing of evaporator (Ice room opened for too long causing higher humidity )
4) Low delivery pressure compressor valves leakage etc )
5) High delivery pressure ( Condenser dirty, not enough SW/FW)someone continue on the list !
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