OPERATION IN EXTREME HEAT - TM-9-4120-430-140048

TM 9-4120-430-14

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OPERATION IN EXTREME HEAT

General

The air conditioner is designed to operate satisfactorily at temperatures up to 120 degree F (49 degree C). If unit is

operated at condenser inlet temperatures higher than 120 degree F (49 degree C), the cooling capacity will be lowered

and long periods of operation at extended temperatures may cause compressor and condenser fan motor to overheat and

trip their internal overload switches or the high pressure cutout switch to shut the unit off.

Filters

To maintain the highest capacity of the unit, the evaporator intake filter and mist eliminator filter should be cleaned

weekly or more often if necessary. Dirty filters reduce the flow of air across the evaporator coil, thereby reducing the

capacity of the air conditioner.

Guards and Louvers

Keep all guards and louvers clean and free of any obstructions to maintain full airflow through the air conditioner.

Ensure the condenser louver in the rear of the unit is open during cooling mode.

Coils

Clean evaporator and condenser coils as frequently as necessary to prevent dirt or other matter from obstructing the air

flow.

OPERATING IN DUSTY OR SANDY AREAS

1. Protection. Shield the air conditioner from dust as much as possible. Take advantage of any natural barriers which

offer protection.

2. Cleaning. Keep the air conditioner as clean as possible. Pay particular attention to the louvers. Use compressed air, if

available, to aid in cleaning.

NOTE

Never operate the unit without having the air filters in place.

OPERATION UNDER RAINY OR HUMID CONDITIONS

WARNING

Make sure power is disconnected from air conditioner before touching any

wiring or other electrical parts.

Take special precautions to keep equipment dry. If installed outdoors, cover the equipment with a waterproof cover when

it is not in use. Remove cover during dry periods. Take all necessary precautions to keep the electrical components free

from moisture. Keep the fresh air vent damper door closed during heavy rain.

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