TM 9-4120-388-14
5-18. SOLENOID VALVES (L1 ad L2) TEST AND COlL REPLACEMENT.
a. Test
b. Coil Replacement
This task covers:
INITIAL SETUP:
Equipment Condition
Junction box removed (4-46).
a. Test.
(1)
Be sure power has been disconnected.
NOTE
The following basic instructions apply to both the equalizing solenoid (L2) and the liquid
line solenoid (L1).
Disconnect wiring harness connector (P6) from connector (J6) on solenoid valve (L2) or connector (P5)
(2)
from connector (J5) on solenoid valve (L1).
Use a multimeter set on lowest OHMS scale to check for continuity between contacts A and B in solenoid
(3)
valve connector. If continuity is not found, coil is open and must be replaced.
(4)
Use multimeter to check for continuity between each contact in solenoid valve connector and coil casing.
If continuity is found between either contact and case, the coil is grounded and should be replaced.
If continuity checks are satisfactory, apply 24 volts DC from an external power supply across contacts A
(5)
and B in solenoid valve connector, and listen for a sharp click when the valve changes position. If a click
is not heard, internal valve problems are indicated and entire valve should be replaced. (Go to para 5-19)
b. Coil replacement. The coil can be replaced without opening the refrigeration pressure system.
Do not attempt any disassembly of solenoid valve other than coil removal with a
refrigerant charge in the system. Refrigerant will be sprayed out dangerously if
screws that attach tube and plunger assembly to valve body are loosened.
(1)
Remove nut that attaches coil to valve body, and remove coil and connector assembly.
(2)
Remove four screws and nuts that attach connector to adapter on coil.
Pull connector away from adapter, unsolder coil leads from pins in the connector, and remove connector
(3)
and gasket.
Remove adapter from the coil casing.
(4)
Feed leads of new coil through adapter, and install adapter on coil casing.
(5)
Feed coil leads through gasket and solder them to pins in connector. Then install gasket, connector, and
(6)
four attaching screws and nuts on adapter.
Install coil and connector assembly, and the attaching nut on valve body.
(7)
Connect harness connector to connector on solenoid valve.
(8)
(9)