TM9-4120-400-14
LEAK TESTING.
Testing
This task covers:
INITIAL SETUP
Tools
Equipment Condition
Remove top panels (para 4-11).
Refrigeration Unit Service Tool Kit
Install service manifold (para 5-9).
Appendix B, item 1
Goggles
General Safety Instructions
Appendix B, item 2
Gloves
Appendix B, item 2
Nitrogen Regulator
Appendix B, item 7
Never pressurize lines with oxygen, mixture with oil will
Materials/Parts
cause an explosion.
Nitrogen
The pressure in a nitrogen cylinder can exceed 2000 psi.
Appendix E, item 8
A nitrogen pressure regulator should be used at all times
Refrigerant R-22
to avoid personal injury.
Appendix E, item 4
Nitrogen is an inert gas that can cause suffocation and
must be discharged in a well ventilated area.
TESTING
NOTE
Either a refrigerant gas leak detector or a strong solution of liquid detergent in water can
be used to test for leaks.
If an electronic refrigerant gas leak detector is available it should be used in accordance
with the procedures contained in TM 9-4940-435-14, "Leak Detector, Refrigerant Gas".
To perform leak testing by use of the electronic detector, it is necessary that the system
be pressurized with a proportion of refrigerant gas. To perform leak testing by use of the
soap solution method, the system may be pressurized with dry nitrogen alone.
Never pressurize lines with oxygen, mixture with oil will cause an explosion.
The pressure in a nitrogen cylinder can exceed 2000 psi. A nitrogen pressure regulator
should be used at all times to avoid personal injury.
Nitrogen is an inert gas that can cause suffocation and must be discharged in a well
ventilated area.
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