TM 9-4120-357-14
Table 4-1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES
Q-Quarterly
Total man-hours required: 4.7
Sequence
Item To Be Inspected
Work time
Number
Procedure
(man-hours)
12
REFRIGERATION SYSTEM
0.3
With lower front panel removed, check all tubs for kinks or
damage. Check compressor mounting bolts for tightness,
and tighten if necessary. Report damage to direct support
maintenance.
13
0.7
WARNING
Disconnect electrical power from unit before flushing
out drains and base plate.
Remove front access panel by unscrewing four panel
fastener screws, and remove evaporator discharge grilles by
removing 16 (each) screws and washers from the grille
frame. Slowly pour about one quart (0.95 liter) of cool water
into each end of drain pan under evaporator coil and
observe lower end of drain tube to verify that water runs
through. If bottom panel contains sludge or slime. Flush out
with cool water. Make sure that external drain lines are not
obstructed. Replace grilles and front access panel, and
reconnect electrical power to unit.
* Service monthly or more frequently when required by operation in extremely dusty or sandy environment.
Section VI. TROUBLESHOOTING
4-10. GENERAL.
a. This section contains troubleshooting information for locating and correcting most of the operating troubles which
may develop in the air conditioner. Each malfunction for an individual component, unit or system is followed by a list of
tests or inspections which will help you to determine corrective actions to take. You should perform the tests/inspections
and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
c. The table lists the common malfunctions which you may find during the operation or maintenance of the air condi-
tioner or its components. You should perform the tests/inspections and corrective actions in the order listed.
4-7