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ARMY TM 9-4210-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-56. MODE SELECT SWITCH (S1).
This task covers:
Inspection
Testing
Removal
Installation
INITIAL SETUP:
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Heat gun (Item 2, Appendix B)
Soldering iron (Item 16, Appendix B)
Screw driver, flat tip (Item 11, Appendix B)
Goggles, industrial (Appendix C)
Personnel: 1
Materials:
Solder, lead-tin alloy (Item 18, Appendix E)
Flux, solder, liquid rosin base (Item 19, 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. Open right electric plate (para 4-31).
INSPECTION
1.
Using wiring diagram (see Figure FO-3) check for loose wires or solder connections, and that leads are properly
connected (see Figure 4-59).
2.
Check switch (1) for smoothness of operation. Replace switch, if defective.
3.
Check switch (1) for signs of overheating or other visible damage. If wires are damaged, replace as necessary.
TESTING
NOTE
In this test, switch contacts are identified by the wire number attached to the contact. Each wire is labeled
with a wire number. See Figure FO-3 as an aid during testing.
Set switch to each position in turn. Using multimeter, check continuity as listed in Table 4-4. If conditions are abnormal
at any switch setting, replace switch.
REMOVAL
1.
Unsolder, tag and disconnect leads.
2.
Loosen set screw (4) and remove knob (5).
3.
Remove nut (3) and star washer (2).
4.
Remove switch (1).
4-106
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