Scotsman CME1356 - Manual (Page 39)

Access Valves
To use the access valves:
1. Be sure that the valve is closed. Remove the
stem cap and insert a 3/16" allen wrench. Check
that the valve is closed.
2. Remove the port cap and attach refrigerant
manifold hoses.
3. Open the valve 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 they are tightly closed.
Refrigeration System Components
Due to the expected level of training and
experience of a refrigeration mechanic, detailed
instructions regarding the replacement of
refrigeration components will not be presented.
However, critical items will be noted here.
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, use a low pressure nitrogen
purge.
F. When evacuating, use of an electronic micron
gage is recommend. Evacuate to 300 microns.
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
Access Valve
CME1356 and CME1656
May 2000
Page 39