Scotsman CME500 Service Manual page 24

CME500
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 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 (they
must be compatable with polyolester oil and
HFC refrigerant).
Always replace the dryer when repairing a leak
or replacing a refrigeration component.
Evacuate the system with a good vacuum
pump to 200 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 capable of locating HP62.
If using recycled refrigerant, it must meet ARI
spec 700 or have been cleaned by a machine
capable of attaining ARI spec 700-88.
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.
August 1994
Page 24