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CHAPTER 2
OPERATING INSTRUCTIONS
Section 1. SERVICE UPON RECEIPT OF EQUIPMENT
2-1. Inspecting and Servicing Equipment
a. Inspection. Inspect entire air conditioner for
signs of damage, missing or loose hardware and any
defects that may have been incurred during
shipment. Make a thorough check to see that all
wiring, lines, and tubing are secure; and pay
particular attention to the evaporator and con-
denser coils and main power receptacle connector.
Be sure that all visible wiring and insulation is not
frayed or broken. Check the evaporator and
condenser fan motors for free rotation. Report all
dam age and defects to organizational maintenance.
b. Servicing. Perform the daily preventive
checks and services listed in table 3-1. Be sure all
hardware is securely in place.
2-2. Installation or Setting up Instructions
a. General. Both the evaporator and condenser
are fitted for mounting to a vertical wall or on a
base. A layout of the holes required to mount the
units on a vertical wall by means of the side
brackets is given in figure 1-7. The layout for holes
necessary for base mounting is given in figure 1-6.
Care and judgement should be exercised in locating
the units. The prime consideration for the con-
denser is that there should be free access for outside
air to and from the condenser coil. Keeping in mind
that intake air is through the expanded metal
screen in front of the condenser section and that
discharge is outward through the condenser coil,
locate the unit so that there is a minimum of 14
inches of free space in front of the unit. If possible,
do not place the unit so that prevailing winds blow
toward face of the coil, and do not locate where
intake air is likely to be laden with dust, dirt, soot,
smoke or other debris. The evaporator section is
similarly designed for base mounting or side-angle
mounting to a vertical wall. Location of this unit
should be determined mainly by the internal layout
of the enclosure to be conditioned. As far as
possible, locate the unit so that the conditioned air
discharges toward the area most critically in need of
cooling. (The direction of discharge can be con-
trolled to some extent by adjustment of discharge
air louvers. Installation should provide for easy
access to the front of the unit in order that filters
may be changed and that controls may be
manipulated. Fresh air intake is through the back
of the unit, which will necessitate a hole cut into the
enclosure’s wall. Some compromise may have to be
made once the locations for each unit have been
selected, since these relative locations are restricted
by the length of the connecting refrigerant hosing
and electrical cabling. The location of each unit
must provide for an adequate flow of air to and from
the unit. Before mounting either one of the units,
check to see that the hoses will reach between the
units.
b. Connections.
(1) Connect both ends of the larger refrigerant
line to the fittings marked “S” on each of the two
section. Use two wrenches, one to hold the fitting on
the unit stationary, the other to tighten the coupling
to approximately 35 ft. lbs. of torque.
Caution: Do not allow the fitting on the
unit to turn. Avoid kinking or twisting the hose.
(2) Connect the smaller refrigerant hose to the
fittings marked “D”.
(3) Open the receiver valve. This valve is
located in the condensing section immediately
behind the air intake grille. (fig. 1-5). Remove the
valve stem cap to expose the stem. Turn this stem
counterclockwise as far as it will go and replace and
tighten cap. A slight hissing sound may be heard
during this process as the refrigerant is released
from the tank into the system.
(4) Connect the electrical cable between the
receptacles marked “L” with the female end of the
cable going to the evaporator section. Since a time
delay is not used, thereceptacle on each condensing
unit must be shorted out with the plug, which is
chained to the receptacle.
(5) Connect the power supply (4-wire cable).
One end of this cable contains a female connector
which is to be attached to the receptacle marked
“P” on the condenser section. The other end of the
cable is to be connected to the power supply.
(a) Set switch # 3 to “VENT” position and
switch # 2 to “ON”.
(b) Turn on power.
(c) Observe rotation of evaporator fan
motor, (this should be the only fan operating at this
setting). Rotation should be counterclockwise when
looking down into the evaporator section. Double
check by noting that air is being discharged out of
the four discharge air grille louvers, just above the
2-1
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