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 TM 9-4120-428-14
DIRECT SUPPORT MAINTENANCE
AIR CONDITIONER, HORIZONTAL, COMPACT
(NSN 4120-01-502-1319)
PURGING THE REFRIGERANT SYSTEM
INITIAL SETUP:
Materials/Parts
Tools
Nitrogen, WP 0000 00, Item 8
Refrigeration Unit Service Tool Kit, WP 0000 00, Item
1
Equipment Condition
Goggles, WP 0000 00, Item 2
Nitrogen Regulator, WP 0000 00, Item 7
Discharge refrigerant system (WP 0065 00)
Remove service manifold (WP 0064 00)
NITROGEN REGULATOR
VAC
VACUUM VALVE
HIGH
PRESSURE
GAUGE VALVE
NITROGEN
RED 1/4 IN.
TANK
PRESSURE GAUGE
REF
HOSE (HIGH)
CHARGE
VALVE
HIGH
LOW
PRESSURE
COMPOUND
GAUGE VALVE
CHARGING
LOW
VALVE
PRESSURE
YELLOW 1/4 IN.
CHARGING VALVE
CHARGE HOSE (REF)
BLUE 1/4 IN.
COMPOUND GAUGE
YELLOW 3/8 IN.
HOSE (LOW)
VACUUM HOSE (VAC)
WARNING
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.
1. Connect the 1/4 inch yellow hose (charge) to a nitrogen regulator and dry nitrogen cylinder.
2. Disconnect the blue hose (compound gauge) hose from the service manifold.
3. Be sure that the service manifold compound gauge and the vacuum valves are closed.
0066 00-1
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