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TRG-TRC004-EN 17
period one
Compressor Types
notes
A hermetic compressor, on the other hand, seals the motor within the
compressor housing. This motor is cooled by the refrigerant, either by
refrigerant vapor that is being drawn into the compressor from the suction line
or by liquid refrigerant that is being drawn from the liquid line. The heat from
the motor is then rejected by the condenser.
Hermetic compressors eliminate the need for the shaft couplings and external
shaft seals that are associated with open motors. The coupling needs precise
alignment, and these seals are a prime source of oil and refrigerant leaks. On
the other hand, if a motor burns out, a system with a hermetic compressor will
require thorough cleaning, while a system with an open compressor will not.
Similarly, the motor for a semihermetic compressor is also contained within
the compressor housing and is cooled by the refrigerant. The term
“semihermetic” means that the sealed housing is designed to be opened to
repair or overhaul the compressor or motor.
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