TM 9-4120-401-14
5-16. LEAK TESTING.
Testing
This task covers:
INITIAL SETUP
Equipment Condition
Tools
Refrigeration Unit Service Tool Kit
Appendix B, item 1
Goggles
Use disconnect switch (NOT POWER
Appendix B, item 2
CABLE) to disconnect power to unit.
Damage to cable connector pins will
Gloves
result if cable is used.
Appendix B, item 2
Disconnect power from power supply.
Nitrogen Regulator
Appendix B, item 7
Remove top panels (para 4-11).
Materials/Parts
Install service manifold (para 5-11).
Nitrogen
Appendix E, item 8
Refrigerant R-22
Appendix E, item 4
Never pressurize refrigerant lines with oxygen. Mixing oxygen 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.
NOTE
An electronic refrigerant gas leak detector should be used to test for leaks.
An electronic refrigerant gas leak detector should be used in accordance with the
procedures contained in TM 9-4940-435-14, "Leak Detector, Refrigerant Gas".
To perform leak testing with the electronic refrigerant gas leak detector, it is
necessary that the system be pressurized with a proportion of refrigerant gas.
5-41
