ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
4.53
HEAT LIMIT SWITCHES (S9 AND S10). This task covers inspection, testing, removal and installation.
INITIAL SETUP
Tools:
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Solder gun (Item 7, Appendix B)
Heat gun (Item 8, Appendix B)
Goggles, industrial (Appendix C)
Personnel: 1
Materials:
Solder, lead-tin alloy (Item 16, Appendix E)
Flux, solder, liquid rosin base (Item 17, Appendix E)
Equipment Conditions:
Disconnect input power to the air conditioner before performing any mternal
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 evaporator duct/panel (paragraph 4.22);
(3) Remove return air filter (paragraph 4 26);
(4) Remove two screws (1), lockwashers (2), flat washer (3). and plastic cover (7) (see fig 4-43); and
(5) Remove cover (7) from plate (8).
INSPECTION
a. Check to see that leads are properly connected (see fig. FO-2 ).
b. Check for loose or broken leads. Repair wires if damaged.
c. Check switch for signs of overheating or other visible damage. Replace switch if damaged.
TESTING
a.
Using multimeter and with MODE SELECT switch to OFF position, check continuity between terminals.
Multimeter should indicate continuity.
b. If switch fails test, replace switch.
REMOVAL
a. Tag and unsolder leads.
4-114
