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TM
5-4120-355-14
(2) Heating operation.
(a) Position thermostat for desired temperature.
(b) Place fan speed toggle switch in desired position.
(c) Place selector switch on LO-HEAT or HI-HEAT position.
(d) For heating with 100 percent recirculated air, close damper door and open intake grille damper.
(e) For heating with fresh makeup air, open damper door and partially close intake grill damper.
(f) For heating with fresh makeup air drawn through chemical biological filter unit when outdoor air is
contaminated, close damper door and partially close intake grille damper.
(3) Ventilating operation.
(a) Place selector switch in VENT position.
(b) Place fan speed toggle switch in desired position.
(c) For ventilating operation, open damper door and close grille damper.
NOTE: If the air conditioner fails to start, open front access panel, and push reset control on circuit breaker (fig.
4-12).
2-3. Stopping.
Refer to figure 2-1. Place the selector switch in OFF position.
2-4. Controls and Instruments.
a. Selector Switch. Sets the unit for cooling or heating.
b. Thermostat. The thermostat is set for the desired temperature.
c. HI-LO Fan Speed Switch. Sets the fan for high or low speed.
d. Liquid Line Sight Glass.Indicates the condition of the refrigerant.
e. High Pressure Cutout Control. The high pressure cutout control located at the upper left rear of the unit (fig. 1-2)
is designed to sense line pressure of 400 to 445 psig from the compressor and will cutout at 445 psig (pounds par
square inch gage). When the line pressure has reduced to 400 psig, the high pressure cutout control can be reset
by pushing the reset button.
f. Low Pressure Cutout Control. The low pressure cutout control located at the upper left rear of the unit (fig. 1-2)
is designed to sense line pressure 25 to 50 psig to the compressor and will cutout at 25 psig. When the line pres-
sure has increased to 50 psig, the low pressure cutout control can be reset by pushing the reset button.
2-5. Operation Under Usual Conditions.
a. Refer to paragraph 2-2, and start the air conditioner.
b. Refer to paragraph 2-2b. and operate the air conditioner.
Section Il. OPERATION UNDER UNUSUAL CONDITIONS
2-6. Operation in Extreme Cold.
a. General. The air conditioner is designed to operate at a maximum low temperature of 50 degrees F. Be sure that
all thermostatic controls and dampers are in working order.

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