Table 2-1. Operator Preventive Maintenance Checks and Services (Cont)

TM 5-4120-393-14

Table 2-1. Operator Preventive Maintenance Checks and Services

Procedures:

Interval

Check for and have

Equipment is

Item

Item to be

repaired or adjusted

Not Ready/

No.

BDAWM

Inspected

as necessary

Available If:

Fresh Air

Check for proper adjustment.

Damper

Check for freedom of operation.

Control kno bs

missing or

inoperable.

Control Panel

Check for obvious damage and missing

Control panel

knobs.

damaged.

Check for proper operation.

Unit not operating

properly.

Refrigerant Sight

After 15 minutes of operation at max-

Bubbles, milky flow

Glass

imum cooling with ambient temperature

or yellow color is

higher than 70 F (21C), check for

observed.

bubbles or milky flow indicating low

refrigerant charge. Check for yellow

color which indicates presence of

moisture.

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