Removal and Replacement: Refrigeration System
General:
••
Scotsman recommends that any work on the
refrigeration system only be done when it is
certain that the system needs repair.
••
The access valves are at the front of the
cabinet. To use them, remove the cap from the
valve ports and the cap from the top of the
valve body. Attach gauge manifold and then
use a 3/16" allen wrench to loosen the valve.
Although pressure readings may be taken with
the valve cracked open, several turns are
required to completely open the valve.
Close
the valve and replace the caps when the
job is finished.
••
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.
••
Refrigerant must not be vented to the
atmosphere.
••
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.
••
When brazing the tubing connections
to the hot gas or thermostatic
expansion valve, the component must
be protected by heat sink material.
Specifically:
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.
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 in the hoses equals minimal
refrigerant discharged into the air.
••
If using recycled refrigerant, it must meet ARI
spec 700-88 or have been cleaned by a
machine capable of attaining ARI spec 700-88.
FRONT SEATED KING VALVE
SERVICE PORT
CHARGING
CYLINDER
RECEIVER
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 schrader valves at the front of
the unit for weighing in the charge. All liquid R-22 must be
weighed into the receiver through the “front seated” king valve.
ALLEN
WRENCH
Torque Stem
to 6-8 ft. lb..
Torque Cap to
8-12 ft. lb..
ACCESS
VALVE
Torque Cap to
7-12 ft. lb..
FM2402R
December, 1992
Page 34
