Scotsman NME654R - Manual (Page 35)

NME654R & FME804R
January 2000
Page 35
CHARGING
CYLINDER or
SCALE
RECEIVER
SERVICE PORT
REFRIGERATION SERVICE
General Information:
Work on the refrigeration system should only be
done when it is certain that the system needs
repair.
· Refrain from checking refrigeration
pressures without reason. Visual inspection
of the water system, observation of the ice
formation, amp draw, voltage, and other
techniques will lead to proper diagnosis.
Scotsman also recommends that, at the time of
initial start up, gauges not be used.
· If gauges must be used, don’t always check the
high side pressure. If the condenser is clean
and seems to be operating correctly, it most
likely is. The low side pressure is more
important on an ice machine than the high side.
· If gauges must be used, use very short hoses to
minimize refrigerant discharged into the air.
· Refrigerant should not be added except as a
way to determine the proper operation of the
product. If the system was low on refrigerant,
there is a leak, and it must be found and
repaired.
· This system has a critical charge, it must be
recharged with the correct amount of refrigerant
as listed on the nameplate of the ice machine,
or performance will suffer.
· Anytime the refrigeration system has been
opened, the dryer should be replaced. Note:
Only a HFC type dryer should be used.
· When brazing the tubing connections to
components such as the TXV, the component
must be protected by heat sink material.
· When brazing a nitrogen purge is required.
· Evacuate to 300 microns.
Recover, reclaim or recycle refrigerant.
Access Valves: To use the access valves:
Remove the cap from the stem, use a 3/16" allen
wrench to check that the valve is CLOSED. The
remove the core cap.
Torque Stem Cap
to 8-12 ft. lb.
Torque Stem to
Torque Core
Cap to 7-12
ft. lb.
Access Valves
Note: There are no valve
cores in this valve.
Allen
Wrench
Charging Procedures
Extra care must be taken when recharging this
remote system. No liquid refrigerant may be placed
in the system at the compressor.
DO NOT use the valves at the front of the unit for
weighing in the charge. All liquid HP62 must be
weighed into the receiver through the “front seated”
king valve".
FRONT SEATED
KING VALVE