TM 9-4120-357-14
2. Weigh the cylinder, and record the weight.
3. Open the discharge line service valve, and slightly open the refrigerant cylinder shutoff valve. Liquid re-
frigerant will be sucked into the refrigeration system rapidly at first, then more slowly as pressures begin to equalize.
When 25 pounds (11.4 KG) of refrigerant have flowed into the refrigeration system, as indicated by the scale, close the
discharge line service valve and the cylinder shutoff valve.
(24) Position the motor support bracket assembly (rear panel) (12, Figure 4-5) on blocks behind the opening
in the casing, and attach associated items as follows:
(a) Position the pressure cutout switch housing behind the small rectangular panel, and secure with four
screws.
(b) Place a lock washer and flat washer on grounding bolt, and insert bolt through terminal lug of ground-
ing cable from junction box. Place a flat washer over the terminal lug, and insert the bolt through the panel. Place a flat
washer, a nut, two flat washers, and another nut on the grounding bolt, in that order.
(c) Push the shaft and ferule of the circuit breaker flexible actuating cable through the hole in the rectan-
gular panel. Install a lock washer, nut and jam nut, and tighten nut and jam nut. Pull shaft all the way out, and grip with
a brass or copper strip held in a pair of pliers. Screw knob onto shaft.
(25) Push motor support bracket assembly (rear panel) into position on casing, and secure with nine screws
through each side flange. Remove support blocks, and install six screws into base plate and six screws through upper
flange.
(26) Install the junction box and control panel assembly and secure it with six screws through the casing into
the side mounting flange, and two screws and washers through lower right hand mounting bracket. Carefully lead control
thermostat sensing bulb and capillary tube around condenser coil, and mount bulb in loop clamp in middle of evaporator
intake chamber.
(27) Connect all wiring harness plugs to their associated receptacles. (See the wiring diagram on the junction
box cover or Figure 4-16).
(29) Slide the mist eliminator into channels in front of evaporator coil.
(30) Position the top panel on the air conditioner. Secure it with 31 screws and washers.
(31) Position the evaporator air discharge grille on the unit, and secure with 16 screws and washers.
(32) Position two evaporator air intake grilles on air conditioner, and secure with 12 screws and washers in
each.
(33) Connect power to air conditioner, pull then push circuit breaker operating knob, and press and release
reset buttons on both pressure cutout switches. Check operation as follows:
WARNING
Hearing protection must be worn when maintenance is performed while air condi-
tioner is in operation. Failure to heed this warning can result in hearing loss or
injury.
CAUTION
Connect power to unit as soon as possible after charging or any period when
power has been disconnected. Allow heater time to vaporize refrigerant in com-
pressor before operation in COOL mode. If knocking or pounding is heard at start
of COOL mode, turn selector switch to OFF or VENTILATE at once and allow addi-
tional warm up time.
(a) With power connected to the air conditioner, turn mode selector switch to cool. Turn temperature con-
trol thermostat to maximum decrease position. With compressor operating, observe the sight-glass liquid indicator. If
bubbles of milkiness appear, top off the refrigerant charge as follows:
1. Connect a cylinder of refrigerant, R22, loosely to the gage port of the suction line service valve.
Open the cylinder shutoff valve for a few seconds to purge air from line. Tighten the connection. Leave the cylinder up-
right.
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