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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-88. SOLENOID VALVES (L1 AND L2) COIL REMOVAL.
This task covers:
a.
Inspection
b.
Testing
c.
Replace
INITIAL SETUP:
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Crimping tool (pigtail) (Item 10, Appendix B)
Personnel: 1
Material:
Varnish, moisture and fungus resistant (Item 16, Appendix E)
Equipment Conditions:
WARNING
Disconnect input power to the air conditioner before performing any internal maintenance. Voltages
used can KILL. Shutting the unit off at the control panel does not disconnect unit power.
1.
Disconnect air conditioner input power at source.
2.
Remove right front evaporator panel (para 4-25).
INSPECTION
1.
Check that leads are properly connected (see Figure 4-88 and Figure FO-3).
2.
Check coil for signs of overheating or other obvious damage. Replace coil, if damaged.
TESTING
1.
Check to be sure power has been disconnected.
2.
Tag and disconnect wires from coil.
3.
Use multimeter set on lowest OHMS scale to check for continuity between the coil wires. If continuity is not
found, coil is open and not be replaced.
4.
Use multimeter to check for continuity between each wire and coil casing. If continuity is found between either
wire and case, the coil is grounded and should be replaced.
5.
If continuity checks are satisfactory, apply 120 V ac from an external power supply across coil wires, 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. Contact Direct Support Maintenance for further action.
REPLACE
NOTE
Replacement consists of replacing defective coil. Refer all other solenoid repair replacement to Direct
Support Maintenance.
1.
Remove screw (6) and coil cover (5).
2.
Tag and disconnect leads.
3.
Remove coil retainer (2) and nameplate (1).
4.
Remove coil (3).
4-172
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