Scotsman MDT3F - Manual (Page 28)

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.
As with any other refrigerant, do not place
pressurized air or oxygen into the refrigeration
system.
Note: The refrigeration system uses an HFC
type refrigerant and MUST use an HFC type
drier.
Evacuation to 300 microns is recommended.
MDT3F & MDT4F
May 2001
Page 27
Stem Cap
Torque to 8-12 ft. lb.
Fitting Cap
Torque to 7-12 ft. lb.
Access Valve
Torque Stem to
6-8 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