Section IV. Operation Under Unusual Conditions

TM 5-4120-356-14

open damper door and p a r t i a l l y c l o s e i n t a k e d a m p e r .

( f ) F o r cooling with a mixture of recirculated air and fresh air

drawn through a chemical biological, radiological filter unit when outdoor air is

c o n t a m i n a t e d , close damper door and partially close intake grille damper. (Applic-

able only if the unit is equipped with a chemical biological radiological (CBR)

filter unit.

(2) Heating Operation.

( R e f e r to figure 2-1 and 2-2.)

(a)

Position thermostat for desired temperature.

Place fan speed toggle switch in desired position.

(b)

P l a c e selector switch on `LO-HEAT" or "HI-HEAT" position.

(c)

( d ) F o r heating with 100 percent recirculated air, close damper

d o o r and open intake g r i l l e d a m p e r .

( e ) F o r heating with a mixture of recirculated air and fresh air,

open damper door and p a r t i a l l y c l o s e i n t a k e g r i l l e d a m p e r .

( f ) F o r heating with a mixture of recirculated air and fresh air

d r a w n through a chemical, biological., radiological filter unit when outdoor air is

c o n t a m i n a t e d , close damper door-and partially-close intake grille damper. (Applic-

a b l e only if the unit is equipped with a chemical, biological, radiological (CBR)

filter unit.

(3)

V e n t i l a t i n g Operation.

( R e f e r to figures 2-1 and 2-2.)

( a ) Place selector switch in "VENTILATE f' position.

(b) Place fan speed toggle switch in desired position.

( c ) Open damper door and close intake grille damper.

NOTE

If the air conditioner fails

t o start, pull, then push

S t o p p i n g . T u r n the selector switch to "OFF". (Refer to figure 2-1.)

Section IV. Operation Under Unusual Conditions

OPERATION IN EXTREME COLD

2-5.

a . T h e air conditioner is designed to o p e r a t e o n t h e c o o l i n g c y c l e w i t h o u t

f o r m i n g f r o s t o r i c e o n t h e e v a p o r a t o r c o i l a t a n ambient (outside) temperature as

l o w as 50F (10C).

If cooling air is desired at ambient (outside) temperatures lower than

2-5