leaks, but modern seals and correct shaft alignment have
improved the success with open-drive compressors.
Compressor motors may also be cooled with the vapor
refrigerant leaving the evaporator. These compressors are
called suction-cooled compressors and are either hermetic or
semi-hermetic compressors. The fully hermetic compressors
are in the smaller sizes and may be returned to the factory for
rebuild. The semi-hermetic compressors may have the motor
or the compressor rebuilt in the field.
Compressor motors may also be cooled with liquid
refrigerant by allowing liquid to enter the motor housing