TM 9-4120-403-14
Suction line or evaporator coil tubing restriction. (See paras 5-14 and 5-25.)
(4) Suction pressure too high.
Possible causes:
Expansion valve bulb damage or poor contact with suction line. (See para 5-15.)
Problem with liquid quench expansion valve. (See para 5-16.)
l. When pressure tests are completed, proceed with the maintenance action indicated.
m. Turn unit OFF.
n. Close charging valves on unit.
o. Remove gages or service manifold hoses from charging valves.
p. Install charging valve protective caps.
Follow-on Procedure:
Secure service valve access cover with six screws.
5- 32