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 TM 9-4120-428-14
0010 00
MALFUNCTION 4
INSUFFICIENT COOLING
SYMPTOM
The unit will not cool properly.
MALFUNCTION
The mode selector switch is improperly set.
CORRECTIVE ACTION
Make sure the MODE SELECTOR switch is properly set in the COOL position.
The sight glass liquid level indicator shows a yellow, milky, or bubble refrigerant.
CORRECTIVE ACTION
If the sight-glass liquid-level indicator shows that the refrigerant is yellow, milky, or
bubbly, low-level or excessive moisture is occurring. Notify your supervisor.
The evaporator and condenser coils are dusty or dirty.
CORRECTIVE ACTION
Clean coils with 25-30 psi compressed air. (WP 0054 00) and (WP 0057 00).
The evaporator's return air filter is dirty.
CORRECTIVE ACTION
Clean the filter when necessary. (WP 0021 00).
The mist eliminator is dirty.
CORRECTIVE ACTION
Remove and clean or replace the mist eliminator. (WP 0024 00).
The airflow is obstructed.
CORRECTIVE ACTION
Remove any obstructions on both the evaporator and condenser sides.
The supply outlet louver is blocked or in a closed position.
CORRECTIVE ACTION
Remove any blockage and/or open the louver.
The evaporator fan motor is worn or defective.
CORRECTIVE ACTION
If necessary, replace the motor.
The evaporator and condenser fans have loose or defective parts.
CORRECTIVE ACTION
Tighten the setscrew or replace the fan.
The area near the condenser guard and fresh air inlet has a heat source o ver 12 Degrees F (40 C). ]
CORRECTIVE ACTION
Notify your supervisor.
0010 00-3
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