TM 9-4120-370-14
TO 35E9-229-1
5-21. LIQUID INDICATOR (SIGHT GLASS) - Continued.
5-22. EXPANSION VALVE
Preliminary procedure:
Inspection
a.
(1) Inspector evidence of leaks, kinked, or otherwise damaged capillary line, and loose or missing mounting
hardware.
(2) Check thermal bulb to see that it is securely clamped to the suction line.
b. Testing and superheat adjustment. The expansion valve as supplied with the unit is preset at the factory. This
valve should not be adjusted unnecessarily.
(1) Perform a refrigerant pressure check on unit in accordance with paragraph 513. 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) Loosen the screws and nuts in the bulb straps that attach the sensing bulb to the suction line, and pull the
bulb out of the straps.
CAUTION
Use care to not damage or kink the capillary.
The following test must be conducted with the power on. Exercise extreme cau-
tion.
(4) Place the sensing bulb in a containerof ice water or crushed ice so that it is reduced to a temperature near
32F (0C).