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Page Title:
REFRIGERANT R-22 PRESSURE CHECK - continued |
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 TM9-4120-423-14&P
4
Both gages should read the same. Check the reading with the appropriate column in table below.
If the system is even partially charged, the pressure should be approximately equal to that shown
in the table for the appropriate ambient temperature. If the pressure is considerably less than
shown in the table, the system does not contain enough Refrigerant R-22 to continue the pressure
check; go to leak testing (WP0073).
5
Turn the MODE SELECTOR SWITCH to the COOL mode with the TEMPERATURE
CONTROL in the full COOLER setting for a few minutes.
6
With the unit operating, allow gages to stabilize. Take readings of the two gages.
If discharge and suction pressures are at, or near, the same value, a pressure equalizer solenoid
valve L1 malfunction, or an internal compressor failure is indicated.
If discharge pressure is low and suction pressure is normal, (see table) a low Refrigerant R-22
charge is indicated.
7
If discharge pressure is normal and suction pressure is either high or low, failure or
maladjustment of the pressure regulator valve is indicated.
8
If discharge pressure is high and suction pressure is normal, a malfunction of quench valve is
indicated.
9
When pressure tests are completed, proceed with the maintenance action indicated.
Table 1. Pressure-Temperature Relationship of Saturated Refrigerant-22
Temperature
Pressure
Deg F
Deg C
Psig
Kg/em2
10
-12.3
32.93
2.315
12
-11.1
34.68
2.439
14
-10.0
36.89
2.593
16
-8.9
38.96
2.739
18
-7.8
41.09
2.889
20
-6.6
43.28
3.043
22
-5.5
45.23
3.180
24
-4.3
47.85
3.364
26
-3.4
50.24
3.532
28
-2.2
52.70
3.705
30
-1.1
55.23
3.883
32
57.83
4.066
0076 00-2
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