Filter
Top Products
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.
Service Recommendations:
This ice machine has a sealed refrigeration
system. It must not be tapped into unless
absolutely necessary. If access is required, tap into
the "process" tubes (dead-end tubing that has
been pinched-off and brazed shut).
After recovery, repair, evacuation and re-charging,
remove the piercing valves:
1. Pinch off the process tube below the valve.
2. Remove the valve.
3. Braze the end of the tube shut.
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.
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.
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
AFE325
August 1994
Page 20