Section IV OPERATION UNDER UNUSUAL CONDITIONS

TM5-4120-383-14

OPERATION IN EXTREME HEAT. -Continued

2-11.

NOTE

Weather stripping, the installation of storm doors,

and windows, if appropriate, and insulation of

surfaces exposed to the outside is recommended when

operating in extremely high temperatures for extended

periods is anticipated.

Clean filter, mist eliminator, and coils more frequently.

OPERATION IN EXTREME COLD.

Do not disturb electrical wiring that has been

exposed to extremely low temperatures. Both the wire

and insulation become brittle when cold and are

easily broken.

The air conditioner is designed to operate in the HEAT mode at

temperatures down to - 50F (-45C) and in the COOL mode at outside

temperatures down to 0F (-18C). Extra care should be taken to

minimize the heating load when operating in extremely low

temperatures. Some of the steps that may be taken are:

Check all openings in the enclosure, especially doors and

windows, to be sure they are tightly closed. Limit in and out

traffic, if possible.

b. Open shades and awnings to permit entry of direct rays of

the sun, if appropriate.

c. Limit the amount of cold, outside air introduced through the

fresh air damper to that essential for ventilation.

NOTE

Weather stripping, the installation of storm doors,

and windows, if appropriate, and insulation of

surfaces exposed to the outside is recommended when

operation at extremely low temperatures for extended

periods is anticipated.

Before attempting to start the unit in the COOL mode or when

fresh air is being used during the HEAT mode, be sure that cover is

rolled up and all exposed air openings are clear of ice and snow.

2-16