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TM9-4120-423-14&P
1
Refrigerant R-22 gas leak detector.  If an electronic Refrigerant R-22 gas leak detector is
available, it should be used in accordance with the procedures contained in this manual, "Leak
Testing the Refrigerant R-22 Gas".
NOTE
The electronic Refrigerant R-22 gas leak detector is highly sensitive to the presence of a
minute quantity of gas in the air, and due to this factor is quite effective in the detection
of small leaks. However, due to the rapid dispersion of Refrigerant R-22 gas into the
surrounding air, difficulty may be encountered in pinpointing large leaks. The detector
must be used in a well ventilated but draft-free area.
2
Soap solutions. In this method, a strong solution of a liquid detergent and water is brushed onto
all points of possible leakage while closely observing for the formation of bubbles.
CAUTION
If the soap solution testing method is used, thoroughly rinse with fresh water after testing
is completed. A residual soap film will attract and accumulate an excessive amount of
dust and dirt during operation.
Testing procedures. To perform leak testing by use of the electronic detector, it is necessary that the
system be pressurized with dry nitrogen alone.
To pressurize a system that has some Refrigerant R-22 charge, for either leak testing method:
3
Remove the caps from the high and low-pressure service valves.
4
Connect the hoses from a charging manifold to the service valves.
NOTE
If it is possible that the problem may not be a leak and that you may not have to replace a
refrigeration system component, Refrigerant-22 may be substituted for the nitrogen in the
following test. If nitrogen is used, you will have to discharge, evacuate, and recharge the
system after this test is completed.
5
Connect a nitrogen pressure regulator and nitrogen bottle to the center hose connection of the
charging manifold.
6
Open the unit service valves and the charging manifold valves.
7
Open the nitrogen tank valve and pressurize the system to 360 psi (24.7 kg/cm2).
8
Perform leak tests.
0073 00-2

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