CU50
Service Manual
February 2012
Page 30
Refrigeration Service
This ice machine use R-134a type refrigerant.
There are specic rules for handling that
refrigerant.
To check for system pressures, add a eld supplied
clamp-on type service valve as a temporary means
of system access. After diagnosis and before nal
repair, replace the clamp-on type valve with valves
that are brazed onto the process tubes of the
system.
Use a low ow of dry nitrogen when brazing on the
system.
Install a new lter drier when replacing a
refrigeration component or after a refrigerant leak
repair.
Evacuate the system to at least 300 microns and
use a micron gauge to measure the evacuation
level.
Weigh in the nameplate charge. The machine is
critically charged and a partial ounce mis-charge
will affect performance.
Bin Thermostat Altitude Adjustment Screw
Altitude
Degrees Rotation to
Turn Adjustment Screw
1000 11 cw
2000 31 cw
3000 52 cw
4000 72 cw
5000 92 cw
600 111 cw
7000 128 cw
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