ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
4.40 SLAVE RELAYS (K12-K15). 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)
Goggles, industrial (Appendix C)
Personnel: . 1
Materials:
Varnish, moisture and fungus resistant (Item 11, Appendix E)
Solder, lead-tin alloy (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 control box assembly (paragraph 4.27), and
(3) Remove relay mounting plate (paragraph 4 38), but do not remove slave relays K12-K15
INSPECTION
Check for cracks, corrosion, loose electrical connections, and loose mounting hardware. Replace relay if damaged (see
TESTING
Using multimeter, check continuity of each relay coil and verify relay contactors open and close by pressing on contacts
Replace if defective (see fig FO-2 ).
REMOVAL
a. Tag and unsolder leads.
b. Remove nut (4) and flat washer (3)
c.
Remove relay (1) from mounting plate (2).
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