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 TM 9-4120-425-14&P
EXPANSION VALVE DIRECT SUPPORT MAINTENANCE REPLACEMENT - Continued
0074-00
WARNING
Individuals who have chronic or recurrent respiratory conditions, including allergies
and asthma, should not be employed in this environment.
WARNING
Avoid bodily contact with liquid refrigerant and avoid inhaling refrigerant gas. Be
especially careful that refrigerant does not come in contact with eyes. Use a air
filtering mask. In case of refrigerant leaks, ventilate area immediately.
WARNING
Check that power source is disconnected. Check that system is discharged of
refrigerant.
CAUTION
When performing brazing/debrazing operations, wrap valves with wet rags to act as
a heat sink.
NOTE
Replace filter-drier whenever refrigerant system is opened.
REMOVAL
Expansion Valve
1.
Locate bulb (1) strapped with insulation (2) to suction line (3).
2.
Remove insulation (2) covering bulb (1).
3.
Withdraw bulb (1) from suction line (3) taking care to prevent damage to capillary tubes (4).
4.
With dry nitrogen flowing through refrigerant system, debraze tubing to valve (8) at debrazing point (5, 6 and 7)
(See WP 0051-00).
5.
Remove expansion valve (8) from unit.
CAUTION
Damaged capillary will cause unit to malfunction. Use care not to damage or kink
capillary.
0074-00-2
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