TM 9-4120-398-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Voltages used can kill. Always disconnect power cord to air conditioner before performing any internal
maintenance. Shutting unit off at its control panel does not disconnect unit power.
1.
AIR CONDITIONER DOES NOT START IN ANY MODE.
Step 1. Check to see if power has been disconnected.
Connect input power.
Step 2. Check to see if circuit breaker is tripped.
Reset button. If circuit breaker continues to trip, contact your supervisor.
REDUCED COOLING CAPACITY.
2.
Step 1. Check that all doors, windows, and other openings in the room or enclosure are tightly closed.
Tightly close all openings.
Step 2. Cheek operation of temperature control.
Set control at maximum DECREASE (cooler); then, if condition improves, adjust properly.
Step 3. Cheek for restricted duet airflow.
Spread ducts properly.
Step 4. Check to be sure that excessive hot, outside air is not being introduced through the fresh air damper.
Fully close damper, then, if condition improves, adjust properly.
Step 5. Check for clogged drain hose.
Unclog drain hose.
