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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-82. DIRTY FILTER SWITCH (S3).
This task covers:
Inspection
Removal
Adjust
Installation
INITIAL SET-UP:
Tools:
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Manometer (Item 3, Appendix B)
Riveter, blind (Item 8, Appendix B)
Personnel: 1
Material:
Varnish, moisture and fungus resistant (Item 16, Appendix E)
Equipment Conditions:
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 left front evaporator panel (para 4-23).
INSPECTION
Check dirty filter switch for corrosion, loose electrical connections or missing mounting hardware. If damaged, replace
switch (see Figure 4-82).
TESTING
1.
Remove screw (6) and cover (4).
2.
Using multimeter, check continuity between common and open electrical terminals.
3.
Turn adjustment screw back and forth slightly and check that switch contacts open and close.
4.
If dirty filter switch fails above tests, replace switch.
ADJUST
1.
Attach tube (1) from manometer to switch (3).
2.
Connect multimeter to common and normally open terminals of switch.
3.
While blowing into tube, gently adjust switch to close when indication reaches 1.15 ± 0.05 inches wc on
manometer.
REMOVAL
1.
Tag and disconnect leads.
2.
Remove two rivets (2).
3.
Remove dirty filter switch (3).
4.
Remove tubing (5) and (7).
4-160
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