Oil drain & rti rapid air purge system procedure – MAHLE RTI RRC770A User Manual
Page 11
Page 8
(BARS)
0
C
R12
R134a
0
3.03
2.90
1
3.15
3.01
2
3.28
3.10
3
3.38
3.28
4
3.52
3.45
5
3.66
3.66
6
3.79
3.81
7
3.93
3.97
8
4.07
4.12
9
4.24
4.28
10
4.41
4.41
11
4.57
4.57
12
4.73
4.73
13
4.89
4.89
14
5.05
5.05
15
5.22
5.24
16
5.38
5.42
17
5.54
5.60
18
5.70
5.79
19
5.87
5.97
20
6.07
6.34
21
6.28
6.59
22
6.48
6.83
23
6.69
7.07
24
6.90
7.31
25
7.11
7.56
26
7.31
7.80
27
7.52
8.04
28
7.73
8.28
29
7.94
8.52
30
8.14
8.76
31
8.35
9.04
32
8.55
9.32
33
8.80
9.59
34
9.05
9.87
35
9.30
10.15
36
9.55
10.43
37
9.79
10.71
38
10.04
10.99
39
10.29
11.26
40
10.62
11.52
41
10.83
11.81
42
11.08
12.09
43
11.32
12.42
44
11.60
12.77
45
11.88
13.12
46
12.16
13.47
47
12.44
13.82
48
12.73
14.16
49
13.01
14.51
50
13.29
14.86
Purge Chart
OIL DRAIN & RTI RAPID AIR PURGE
SYSTEM PROCEDURE
Oil and Non-condensable Gas (Air) are separated from
the recovered refrigerant and MUST be removed
following EACH recycling procedure as follows:
1. Press and hold the Purge Button (on the right side
of the RRC770) until the pressure reading on the
Pressure Gauge above this Push Button drops one
small graduation mark (approximately 5 PSIG).
2. SLOWLY open the Oil Drain Valve (Lower left side
on back of RRC770) to vent Non-condensable Gas
and drain any oil which may have been removed
from the A/C System. A plastic cup is provided to
collect the oil.
Unless the A/C System had previously been
overfilled, the RRC770 will typically not remove
enough oil to make replenishment necessary.
Leave the Oil Drain Valve open.
3. Determine the room temperature.
4. Locate the pressure (BARS) corresponding to this
room temperature (
0
C) in the chart to the right.
If the pressure indicated on the gauge is greater
than that determined from the chart...
Press and hold the Purge Button until the gauge
pressure equals that shown in the chart. Any Non-
condensable Gas will be vented through the Oil
Drain Valve.
5. Close the Oil Drain Valve.
6. Press and hold the Purge Button for approximately
5 seconds. This permits any residual Non-
condensable Gas to be re-circulated for
reprocessing during the next recycle procedure.