ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
DRAIN AREA. This task covers inspection and service.
Tool kit, service, refrigeration unit (Item 1, Appendix B)
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, and
b. Check that drain area does not contain water.
Check drain pan for chipped, corroded, or worn corrosion preventative material, If damaged, scrape and vacuum
repair area, then coat with corrosion preventative material.
a. Pour some clean fresh water into drain area.
b. If water does not freely flow out of dram tube or has a muddy appearance, insert flexible wire in drain tube.
Agitate until clog and accumulated debris are loose.
Pour additional water in drain area until unrestricted flow of clean water pours from drain rube.
d. Vacuum dram pan and drain holes