Heat exchangers should not be added to a refrigeration system without a thorough examination of its effects on the system. Improper application of a heat exchanger could cause damage to the compressor. In particular, two precautions should be observed above all:
1. Heat exchangers are not normally used in systems running refrigerant R-22. Condensing pressures in R-22 systems are usually quite high and an increase in the suction line superheat would raise the discharge temperature so high that the compressor could easily overheat.
2. In systems with hermetic motor compressors the motors are cooled with the suction vapor. Excessive heating of the suction gas could again overheat the compressor and cause damage.
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