Removal and Replacement: Refrigeration System
I
f 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:
The access valves are at the front of the cabinet,
behind the left grill. To use them, remove the cap
from the stem, and using an 3/16" allen wrench,
check that the valve is CLOSED. Then remove the
core cap and attach guages in the usual way. The
valve may then be opened to service the system.
Note: several turns are required to fully open the
valve.
Close the valve and replace the caps when the
job is finished. The Valve MUST be Closed and
the caps MUST be on, or the VALVE WILL
LEAK.
••
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 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. Halide torches will not locate the
very small leaks.
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.
Control Box Service
The control box may be lifted up from its normal
position to improve service access.
To Move Control Box
1. Disconnect electrical power.
2. Go thru the steps to remove the hood, door and
bin.
3. Locate and remove the 3/8" hex head screw
holding the control box to the base, just below the
purge switch.
4. Pull the control box forward about an inch.
5. The control box may now be moved up the
height of the control box, be careful not to kink any
capillary tubes.
6. After service, replace the control box in its
normal position.
ALLEN
WRENCH
Torque Stem
to 6-8 ft. lbs.
Torque Stem Cap
to 8-12 ft. lb.
ACCESS VALVE
Torque Core Cap
to 7-12 ft. lb.
Note: There are
NO Schrader
cores in the valve.
Access
Valve Use
Electrical shock hazard.
Electrical shock can
cause personal injury.
Disconnect power before
beginning to service
components.
AFE400
May 1995
Page 25
