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TM 9-4120-389-14
5-14. SOLENOID VALVE (L1) TEST AND COIL REPLACEMENT
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.
Preliminary procedure: Remove top cover (See para. 4-14).
a. Test
(1) Tag and disconnect leads L1-1 and L1-2 from TB4.
(2) Using multimeter set on lowest OHMS scale, check for continuity between leads L1-1 and L1-2.
If continuity is not found, coil is open and must be replaced.
(3) Using multimeter set on lowest OHMS scale, check for continuity between each lead and coil
casing. If continuity is found between either lead and the casing, the coil is grounded and must be replaced.
(4) If continuity checks are satisfactory, power up unit and turn mode selector to COOL and
temperature select to COOLER.
(5) Listen for a sharp click when the valve should change position.
(6) If a click is not heard, internal valve problems are indicated.
(7) Go to paragraph 5-15 to repair or replace valve.
b. Coil removal. The coil can be replaced without opening the refrigeration system.
WARNING
Do not attempt any disassembly of solenoid valve, other than coil removal, when the refrigeration system is
under pressure. Refrigeration will be sprayed out dangerously.
(1) Remove screw, flatwasher, lockwasher and nut from clamp on condenser motor support.
Remove clamp.
(2) Remove screw and lockwasher from clamp on condenser scroll. Remove clamp.
(3) Remove nut that secures coil.
5-34
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