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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
5-13.
PURGING REFRIGERANT SYSTEM.
This task covers: Service
INITIAL SETUP:
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Goggles, industrial (Appendix C)
Nitrogen regulator (Item 25, Appendix B)
Gloves, chemical (Appendix C)
Personnel: 1
Material:
Nitrogen (Item 14, Appendix E)
Equipment Conditions:
1.
Install service manifold (para 5-11 steps 1 thru 5.)
2.
Discharge system (para 5-12).
SERVICE
WARNING
Death or serious injury may result if personnel fail to observe safety precautions. Use great care to
avoid contact with liquid refrigerant or refrigerant gas-being discharged under pressure. Sudden and
irreversible tissue damage can result from freezing. Wear thermal protective gloves and a face
protector or goggles in any situation where skin-eye-contact is possible. Prevent contact of
refrigerant gas with flame or hot surfaces. Heat causes the refrigerant to break down and form
carbonyl chloride (phosgene), a highly poisonous and corrosive gas.
CAUTION
Nitrogen cylinders are pressurized containers. The pressure in the cylinder can exceed 2000 psi. A
nitrogen pressure regulator should be used at all times when nitrogen is used for leak check or purge
operations. Do not allow nitrogen pressure regulator setting to exceed 200 psig during purging.
Nitrogen is an inert gas. However, it also presents danger as a suffocant and, therefore, must also
be discharged in a ventilated location.
NOTE
The refrigeration system must be purged with dry nitrogen before any brazing or debrazing is performed
on any component.
5-22
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