REFRIGERATION SERVICE
General Information:
Scotsman recommends that any work on the
refrigeration system only be done when it is certain
that the system needs repair. Use conservation
minded service procedures:
••
Refrain from checking refrigeration
pressures without reason.
There are many
ways to determine the proper operation of a
Scotsman ice machine without using refrigerant
gauges. 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, do not 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 much more
important on an ice machine than is the high
side.
••
If gauges must be used, use very short hoses.
Minimal refrigerant discharged into the hoses
equals minimal 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 hot gas valve, the
component must be protected by heat sink
material.
Recover, reclaim or recycle refrigerant. The
method chosen is up to the service company.
There are various mechanical devices that may be
used to recycle refrigerant at the field level,
however, Scotsman requires that any refrigerant
placed into a Scotsman ice machine meet ARI
spec 700-88. Reclaim programs are available
through most refrigerant wholesalers.
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.
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.
Torque Stem Cap to
8-12 ft. lb.
Torque Stem to
6-8 ft. lb.
Torque
Core Cap to
7-12 ft. lb.
Access Valves
Note: There are no valve
cores in this valve.
Allen
Wrench
CME650R
March 1994
Page 30
