TM 9-4120-357-14
(2) Connect the flexible circuit breaker operating cable to the actuator arm as follows:
(a) Insert the end of the flexible cable core through the hole in the top of the actuator arm (15) , and slide the
core end fitting (14) over the end. Tighten the setscrew temporarily to keep the fitting in place.
(b) Place the hold-down clamp (16) over the cable, and secure it to the junction box with two screws and wash-
ers.
(c) Adjust the core end fitting (14) to provide 0.12 - 0.25 inch (3-6 MM) clearance below the actuator arm (15)
when the cable is fully extended and the circuit breaker is off.
(3) Carefully lead control thermostat sensor bulb and capillary tube around condenser coil to middle of evaporator
intake chamber. Secure bulb in loop clamp.
(4) Connect all wiring harness plugs to their associated receptacles on the junction box and control panel.
WARNING
Hearing protection must be worn when maintenance is performed while air conditioner is
in operation. 7 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 compressor before opera-
tion in COOL mode. If knocking or pounding is heard at start of COOL mode, turn selec-
tor switch to OFF or VENTILATE at once and allow additional warm up time.
(5) With power connected to the air conditioner, turn the mode selector switch to cool, and turn the temperature
control thermostat to maximum decrease position. Temporarily prop the front access panel across the opening. With
compressor operating, observe the sight-glass indicator. If bubbles or milkiness appear, top off the refrigerant charge
as follows:
(a) Connect a cylinder of refrigerant, R22, loosely to the gage port of the suction line service valve, and open
the cylinder shutoff valve for a few seconds to purge air from the line. Tighten the connection. Leave the cylinder up-
right, or connect the line to the vapor valve.
(b) With the air conditioner compressor operating, open the suction line service valve and the cylinder shutoff
valve to charge refrigerant gas into the system, while observing the sight-glass liquid indicator.
(c) When the liquid in the sight-glass indicator runs clear and free of bubbles, close the suction line service valve
and the cylinder shutoff valve.
(d) Disconnect the refrigerant cylinders, and replace caps on both service valves.
h. Final Assembly. Position the front access panel, with its lower edge behind the step on the base plate, and
push into contact with the casing. Secure with four panel fastener screws.
5-25. Accumulator.
The accumulator consists of two cylindrical tanks (10, 11, Figure 4-7) , one mounted on each wall of the casing behind
the evaporator intake grille. Functionally, the accumulator serves to increase capacity for liquid refrigerant, and to sup-
port the discharge pressure during low-ambient operation.
a. Access. Obtain access to the two accumulator tanks and the service valves as directed in the following proce-
dure:
(1) Remove 12 screws and washers from each of the evaporator intake grilles, and remove the grilles.
(2) Unscrew four panel fastener screws from the front access panel, and remove the panel.
b. Discharging the System. Whenever a leak is detected or a refrigeration component must be replaced, discharge
all gas from the refrigeration system in accordance with paragraph 5-6.
c. Removal. Connect a cylinder of dry nitrogen to the gage port of the discharge service valve, and establish a flow
of 1-2 CFM (0.5-1 M3) through the system. Remove the accumulator tank(s) in accordance with the following proce-
dure: (See Figure 4-7.)
5-47
