Section IV. OPERATION OF EQUIPMENT - TM-5-4120-274-150029

TM 5-412-274-15

Section IV. OPERATION OF EQUIPMENT

(3) Ventilating operation.

2-11. General

a. The instructions in this section are pub-

(a) Place selector switch in ventilate po-

lished for the information and guidance of person-

sition.

nel responsible for operation of the air condition-

(b) Place fan speed toggle switch in de-

er.

sired Position.

b. The operator must know how to perform

every operation of which the air conditioner is

er door and close intake grille damper.

capable. This section gives instructions on start-

ing, stopping, and operating details of the air

Note. If the air conditioner fails to start, open

front access panel, and push reset control on circuit

conditioner. Since nearly every application pre-

breaker (fig. 2-2).

sents a different problem, the operator may have

to vary given procedure to fit the individual job.

2-13. Stopping

2-12. Starting

Refer to figure 2-3. Place selector switch in

"OFF" position.

a. Preparation for Stating.

(1) Perform necessary daily preventive

2-14. Operation Under Usual Conditions

maintenance services (fig. 3-1).

(2) Check electrical requirements (pars 2-

a. Refer to paragraph 2-12, and start the air

5d).

conditioner.

b. Starting.

b. Refer to figure 2-3 and operate the air con-

(1) Cooling operation.

ditioner.

(a) Position thermostat for desired tem-

perature.

2-15. Operation in Extreme Cold

(b) Place fan speed toggle switch in de-

a. General. The air conditioner is designed to

sired position.

operate at a maximum low temperature of 50F.

Be sure that all thermostatic controls and damp-

(d) For cooling with 100 percent re-

ers are in working order.

circulated air, close damper door.

(e) For cooling with fresh makeup air,

b. Electrical System. Make sure the electrical

open damper door and partially close intake

system is free of ice and moisture.

grille damper.

Caution: Do not disturb the wiring during

(f) For cooling with fresh makeup air

cold weather unless absolutely necessary. Cold

drawn through chemical biological filter unit

temperatures make wiring and insulation brittle

when outdoor air is contaminated, close damper

and are l asily broken.

door and partially close intake grille damper.

(2) Heating Operation.

(a) Position thermostat for desired tem-

2-16. Operation in Extreme Heat

perature.

a. General. The air conditioner is designed to

(b) Place fan speed toggle switch in de-

operate satisfactorily at temperatures up to

sired position.

120F.

b. Ventilation. Allow sufficient room around

heat position.

the air conditioner for adequate air circulation.

(d) For heating with 100 percent re-

Note. Do not restrict the flow of air at the intake

circulated air, close damper door and open intake

and discharge openings of the unit.

grille damper.

(e) For heating with fresh makeup air,

2-17. Operation in Dusty or Sandy Areas

open damper door and partially close intake grille

damper.

Clean the condenser coil (par 3-55c(2)) and

evaporator coil (para 3-54c(2)) weekly or more

(f) For heating with fressh makeup air

often if necessary. Clean the air conditioning fil-

drawn through chemical biological filter unit

ter, fresh air inlet filter and condenser screen

when outdoor air is contaminated, close damper

daily (para 3-9b, 3-20).

door and partially close intake grille damper.

2-7