TM 9-4120-395-14&P
3-3.
TROUBLESHOOTING - Continued.
Table 3-1. Operator Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
REDUCED COOLING CAPACITY.
Step 1. Check that all doors, windows, and other openings In the enclosure are tightly closed.
Tightly close all openings.
Reset thermostat to desired temperature.
Set system switch to COOL.
Step 4. Check that the indoor louvers in the conditioned air inlet and outlet grilles are open and not blocked.
Open or clear louvers.
Step 5. Check that outside air inlet and outlets are riot obstructed.
Remove obstructions.
Step 6. Check( that excessive hot air is not being introduced through the fresh air damper.
Contact unit maintenance to adjust the damper.
4.
Step-1. Check that all doors, window, and other openings in the enclosure are tightly closed.
Tightly close all openings.
Reset thermostat to desired temperature.
Ensure system switch is set to HEAT.
Step 4. Check that the louvers in the conditioned air inlet and outlet grilles are open and not blocked.
Open or clear louvers.
Step 5 Check to be sure that excessively cold air Is not being introduced through the fresh air damper.
Contact unit maintenance to adjust the damper.
3-2