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Purging the Refrigerant System - TM-9-4120-428-140218
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TM-9-4120-428-14 Air Conditioner Horizontal Compact 9000 BTU/HR 208 Volt Three Phase 400 Hertz Model No. F9000H-4SPFI Manual
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BRAZING - TM-9-4120-428-140220
TM 9-4120-428-14
DIRECT SUPPORT MAINTENANCE
AIR CONDITIONER, HORIZONTAL, COMPACT
BRAZING, DEBRAZING, AND CLEANING PROCEDURES
INITIAL SETUP:
Materials/Parts
Tools
Brazing Alloy, WP 0000 00, Items 9 and 10
Refrigeration Unit Service Tool Kit, WP 0000 00, Item
Brazing Flux, WP 0000 00, Item 11
1
Abrasive Cloth, WP 0000 00, Item 12
Goggles, WP 0000 00, Item 2
Rags, WP 0000 00, Item 13
Gloves, WP 0000 00, Item 2
Equipment Condition
Discharge refrigerant system (WP 0065 00)
WARNING
The polyurethane foam used as insulation in the air conditioner will break down to form
toxic gasses if exposed to the flame of a torch or brazing temperature.
Never use a heating torch on any part that contains refrigerant. Heat will cause the
refrigerant to break down and form carbonyl chloride (phosgene), a highly toxic and
corrosive gas. All of the refrigerant must be discharged from the system. The entire
system must be purged with dry nitrogen before beginning any debrazing operation.
DEBRAZING
1. Be sure the work area is well ventilated and that dry nitrogen is flowing through the refrigeration system at a rate of
1 2 cfm (0.028 0.057 m3/minute). See Para 5 -11).
WARNING
The polyurethane foam, used as insulation in the air conditioner, will break down to form
toxic gases if exposed to the flame of a torch or brazing temperature.
2. Protect the insulation, wiring harnesses, and other components with the appropriate shields.
WARNING
Never use a heating torch on any part that contains refrigerant. Heat will cause the
refrigerant to break down and form carbonyl chloride (phosgene), a highly toxic and
corrosive gas. All of the refrigerant must be discharged from the system. The entire
system must be purged with dry nitrogen before beginning any debrazing operation.
NOTE
It may be easier to access a component by cutting or debrazing the copper lines in the
accessible areas and by removing part of the interconnecting tubing with the component.
3. When debrazing a joint on a valve, disassemble the valve to the extent possible and wrap all but the joint with a wet
cloth to act as a heat sink.
0067 00-1

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