Scotsman Ice AFE325 Refrigeration System, Service Recommendations, HFC type drier must be used

AFE325

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 0F.	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

August 1994

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