Refrigeration Service - Scotsman MDT5N40A-1B Manual

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.
MDT5N25 & MDT5N40
Recover, reclaim or recycle refrigerant. The
method chosen is up to the service company. Any
refrigerant placed into a Scotsman ice machine
must 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.
Allen
Wrench
Torque Stem to
6-8 ft. lb.
Torque Stem Cap to
8-12 ft. lb.
May 2001
Page 31
Torque Core
Cap to 7-12
ft. lb.
Access Valves
Note: There are no valve
cores in this valve.