Refrigeration systems are very sensitive to moisture in the refrigerant side
of the system. If moisture gets into the system, failure may occur due to:
 Ice formation in expansion valves, capillary tubes or evaporators,
Corrosion of metals,
Copper plating,
Chemical damage to insulation in hermetic compressors or other system
materials.
Sources of moisture in the refrigeration system include:
Faulty equipment drying in factories and service operations,
Introduction of moisture during installation or service operations in the
field,
Low-side leaks (resulting in entrance of moisture-laden air),
Leakage of water-cooled condenser,
Oxidation of certain hydrocarbons of oil to produce moisture,
Wet oil, refrigerant or both,
Decomposing cellulose insulation in hermetically sealed units.
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