Scotsman MFE400 - Manual (Page 21)

Refrigeration System
This ice machine uses R-134a as the refrigerant.
This refrigerant has no chlorine, and therefore
requires polyolester type refrigerant oil. This oil
requires specific service procedures.
General Service
A HFC type liquid line drier is required. "Standard"
driers may not take out enough moisture and may
affect the oil additives.
The time that the refrigeration system is open to
the air must not exceed 15 minutes. The oil will
rapidly absorb moisture from the air, and the
contact time must be kept to a minimum.
A special or very sensitive electronic leak detector
will be needed to locate refrigerant leaks. Many
are on the market that will sense R-134a.
The access valves must be in the closed position
before the hose caps are removed. Do not remove
the hose caps before checking the position of the
valve. Use a 3/16" allen wrench to open and close
the valve.
Recovery and vacuum equipment should use
polyolester oil to minimize cross-contamination.
A HFC type drier must be used.
As with any other refrigerant, do not place
pressurized air or oxygen into the refrigeration
system.
Evacuation to 200 microns is recommended.
Torque Stem
to 6-8 ft. lb.
Torque Stem
Cap to 8-12 ft. lb.
Torque Fitting Cap
to 7-12 ft. lb.
Temperature Pressure Chart, Selected Points
Temperature in
0
F. PSIG of R-134a
-10 2.0
-6 3.7
-4 4.6
-2 5.5
0 6.5
1 7.0
2 7.5
3 8.0
4 8.6
5 9.1
10 12.0
12 13.2
14 14.4
16 15.7
18 17.1
20 18.4
25 22.1
30 26.1
31 26.9
32 27.8
33 28.6
34 29.5
35 30.4
40 35.0
45 40.0
50 45.4
75 78.7
90 104.3
110 146.4
120 171.1
130 198.7
150 262.8
MFE400
May 1994
Page 21