Technical Manual

GEM-MFI SERIES Refrigeration System Service
Page 49
Refrigeration Service: Remote
General: This ice machine uses R404A refrigerant and polyolester oil. Do NOT use mineral oil in this
refrigeration system.
●When the refrigeration system is serviced, a special liquid line drier is required. It is included with
replacement compressors.
●R404A is not compatible with mineral oil so these ice machines use Polyolester oil. Polyolester oil absorbs
water very easily. A system opened for service 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 Halongenated refrigerant or HFC-134a will work. Check with the leak detector manufacturer if in
doubt.
●Evacuate to 300 microns.
●Liquid charge the system.
Access Valves:
To use the access valves:
●Remove the cap from the stem, use a 3/16 inch Allen wrench to check that the valve is
CLOSED. Then remove the core cap.
●Close the valve and replace the caps when done. The valve must be closed and the caps
tightened.
Charging Procedure
●Extra care must be taken when charging 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”.
Torque Stem to 6-8 ft.-lb.
Torque Caps to 7-12 ft.-lbs
Receiver
Charging Cylinder
Front Seated Kin
g
Valve
Service Port