Scotsman CM500 User Manual page 23

Removal and Replacement: Refrigeration System
If the refrigeration system must be serviced, the
quality of service must insure that there will
not be a repeat failure, as repeat failures will
cause refrigerant to be discharged into the air by
the failure or when the failure is corrected:
If there has been a compressor burn out, check
for acid in the oil. If acid is indicated, extra steps
must be taken to clean up the system.
Never use refrigerant, such as R-11, to clean
up or flush out a refrigeration system. When
system clean-up is required, the use of suction
line filter-dryers and liquid line filter-dryers are
recommended.
Always replace the dryer when repairing a leak
or replacing a refrigeration component.
Evacuate the system with a good vacuum
pump to 500 microns or less. If the triple
evacuation method is used, the vacuum should
be broken each time with dry nitrogen, not
refrigerant. Evacuation must be from both sides
of the system.
Weigh in or measure in the nameplate charge.
Recharge into the high side.
Check for leaks with a high quality, electronic
leak detector. Halide torches will not locate the
very small leaks.
Scotsman's schrader valve caps must be
tightened to 70 inch - pounds to insure that the
valves will not leak.
If an ice machine is to be discarded and still
contains refrigerant, Scotsman recommends that
the refrigerant be recovered, reclaimed, or
recycled so that it is not discharged into the air.
December, 1992
Page 23
CM500