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TM 9-4120-389-14
5-22. EXPANSION VALVE (PRIMARY)
Preliminary Procedure: Remove top cover (See para. 4-14)
WARNING
Voltages used can kill. Always disconnect power cord to air conditioner before
performing any internal maintenance. Shutting off at its control module does not
disconnect unit power.
a.
Inspection
(1)
Inspect for evidence of leaks, kinked, or otherwise damaged capillary line, and loose or
missing mounting hardware.
(2)
Check sensing bulb to see that it is securely clamped.
(3)
If a leak is suspected or indicated, test per para. 5-6.
b.
Testing. The expansion valve as supplied with the unit is preset at the factory. This valve cannot
be adjusted.
(1)
Perform a refrigerant pressure check on unit in accordance with para. 5-9. Leave gages or
service manifold attached.
(2)
Remove the suction line insulation from the area of the sensing bulb. Observe location and
position of bulb for reinstallation.
(3)
Remove two screws and nuts from two clamps on sensing bulb.
WARNING
The following test must be conducted with the power on. Exercise extreme
caution.
CAUTION
Use care to not damage or kink the capillary.
(4)
Place the sensing bulb in a container of ice water or crushed ice so that it is reduced to a
temperature near 32 deg. F (O deg. C).
5-56
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