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CME1856W
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. Remove the stem cap and insert a 3/16" allen
wrench. Check that the valve is closed.
2. Remove the port caps and attach refrigerant
manifold hoses.
3. Open the valves and purge the hoses.
4. When service is complete, shut the discharge
access valve first. 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. Make certain that all caps are on tightly.
November 2001
Page 41
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