Scotsman CME2006R - Manual (Page 42)

Refrigerant
1. This ice machine uses R-404A or HP62 as a
refrigerant. It has several unique characteristics.
A. It is a near-azeotrope, and must be liquid
charged.
B. It must use polyol ester refrigerant oil, and that
oil is very water absorbent. The system must not
be open for more than 15 minutes.
C. An electronic leak detector capable of locating
HFC-134a type refrigerant must be used to locate
refrigerant leaks.
D. A special HFC type liquid line dryer must be
used.
E. When brazing, a dry nitrogen purge is required.
F. When evacuating, use of an electronic micron
gage is recommend. Evacuate to 300 microns.
Recovering the Refrigerant
Because of the check valves, liquid refrigerant
must be recovered thru the liquid line valve, as
well as the low side access valve at the front of the
machine.
Access Valves:
1. Low Side: Remove the stem cap and insert a
3/16" allen wrench. Check that the valve is closed.
Liquid Line: Remove the stem cap. Use a
refrigeration wrench and check that the valve stem
is fully UP or OUT. If recovering, remove the
schrader core before opening the valve.
2. Remove the port caps and attach refrigerant
manifold hoses.
3. Open the valves and purge the hoses. Note:
Open liquid line valve half way to access both
sides of the liquid line.
4. When service is complete, shut the liquid line
access valve first (fully up). Then, with the
machine running and the middle hose outlet
securely fastened to the manifold or refrigerant
tank (closed) open both manifold valves. This
allows any liquid refrigerant in the discharge hose
to flow thru the manifold and into the suction side.
5. After the gages have equaled, shut the
manifold valves and the suction access valve.
6. Remove the gages and replace the stem and
port caps. Return the schrader core to the liquid
line valve. Make certain that all caps are on tightly.
Allen
Wrench
Torque Stem
to 6-8 ft. lb.
Torque Stem Cap
to 8-12 ft. lb.
Torque Core Cap
to 7-12 ft. lb.
Access Valve
Low Side Access Valve
Stem Must Be
Half-way Out
(after hose is
connected) to
Recover,
Evacuate and
Recharge
Liquid Line Access Valve
CME2006R
July 1998
Page 42