Refrigeration Service - Scotsman FME1204R Service Manual

NME954R & FME1204R

Refrigeration Service

This ice machine uses R-404A refrigerant and
polyolester oil. Do NOT use mineral oil in this
refrigeration system.
·
R-404A is a "Near Azeotrope" so liquid charging
is required:
·
When the system is serviced, a special liquid
line drier is required. It is included with
replacement compressors.
·
R-404A is not compatible with mineral oil, so
these ice machines use Polyolester oil.
Polyolester oil absorbs water very easily. When
one of these refrigeration systems is opened for
service, it must be re-sealed as soon as
possible (15 minutes maximum).
·
Special leak detection equipment is required to
locate small refrigerant leaks. Usually a leak
detector capable of detecting a Halongenated
refrigerant or HFC-134a will work. Check with
the leak detector manufacturer if in doubt.
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.
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 access valves at the front of the
unit for weighing in the charge. All liquid
refrigerant must be weighed into the receiver
through the front seated "king valve".
Receiver
ALLEN
WRENCH
Torque Stem
to 6-8 ft. lb..
Front Seated
King Valve
Service Port
January 2000
Page 34
Torque Cap to
8-12 ft. lb..
ACCESS
VALVE
Torque Cap to
7-12 ft. lb..
Charging
Cylinder