Table 4-1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) QUARTERLY SCHEDULE (cont)

TM 5-4120-393-14

Table 4-1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) QUARTERLY SCHEDULE (cont)

Item

Item To Be

Procedures

No.

Inspected/Serviced

Condensate Drip Pan, Drain

Tubes, and Drain Trap

a. Wipe any dust or dirt out of the condensate drip pan.

NOTE

The drain trap is located between junction

box number one and the casing wall. Use

a mirror and flashlight, check waterflow.

Remove junction box number one (para

4-40) if cleaning is necessary.

b. Pour about two cups of clean fresh water into the

condensate drip pan and watch for it to flow through

the drain trap at the bottom end of the drain tube.

c. If the water does not flow through the trap, or if the

discharged water has a muddy appearance, remove

the cotter pin, spring, and ball from the bottom end of

the drain tube and thoroughly flush the tube. If the

tube is clogged, insert a flexible wire from either the

top or bottom end and agitate until the clog is

removed. Pour additional water in the drip pan until an

unrestricted flow of clean water is achieved. Check

that ball and sprin g are clean and in good condition.

Reinstall the ball, spring, and cotter pin.

4-28