TM 9-4120-357-14
(b) Remove two screws and washers from the hold-down clamp (16). Remove the clamp.
(c) Lift the cable core out of hole in actuator arm (15) and tie or tape the flexible cable to one side, out of
the way.
(4) Remove six screws (7) from the casing and mounting flange of the junction box, and remove two screws (8)
and washers (9) from the mounting bracket.
(5) Detach thermostat sensing bulb from loop clamp in
middle of
evaporator intake chamber. Carefully coil capil-
lary tube as you lead bulb toward control panel to avoid kinking tube.
(6) Remove the junction box and control panel assembly from the air conditioner.
b. Discharge the System. Whenever a leak is detected or a refrigerant component must be replaced, you must
discharge all gas from the refrigeration system in accordance with paragraph 5-6.
c. Removal. After refrigerant has been completely discharged from the system, remove the drier-strainer as fol-
lows:
(1) Unscrew tubing flare nuts (9, Figure 5-2) from top and bottom of
the drier-strainer (8).
(2) Remove a screw, nut and lock washer from the air conditioner casing and clamp (10), and remove the clamp
and drier-strainer.
(3) Open clamp (10) slightly, and slide it off of drier strainer.
d. Installation. Install a new drier-strainer as directed in the following steps:
CAUTION
Leave caps on the threaded connections f the drier-strainer until ready to connect
the tubing flare nuts. Make certain that the direction-of-flow arrow is pointing
down before making tubing connections.
(1) Slide clamp (10, Figure 5-2) over drier-strainer, and secure to
casing with a
screw, washer and nut.
(2) Remove caps from the drier-strainer connections, and connect tubing flare nuts (9). Use a back-up wrench on
the hex of the drier-strainer connections when tightening flare nuts.
e. Purging the System. With the refrigeration system discharged and a
hose attached to
the gage port of
the suc-
tion service valve, connect a cylinder of oil-pumped dry nitrogen to the gage port of the high-pressure service valve.
Open the high-pressure service valve, and crack open the cylinder shutoff valve to establish a flow of 1-2 CFM (0.5 - 1
M3) through the system. Purge for at least 30 minutes to expel all other gases, impurities and water vapor. Turn off both
service valves before disconnecting the nitrogen cylinder and the discharge hose.
f. Charging the System. Prepare the refrigeration system for charging by attaching a pressure gage to the high-
pressure service valve gage port, and a pressure hose and drier-strainer, loosely, to the suction service valve gage port.
Leave both valves closed. Proceed as follows:
WARNING
Avoid contact with liquid refrigerant or escaping refrigerant gas. Irreversible tis-
sue damage can result from sudden freezing. Be especially careful to protect the
eyes. Avoid inhaling high concentrations of refrigerant gas, and prevent gas
coming into direct contact with flame or hot metal surfaces; lethal phosgene gas
can be formed.
(1) Connect a cylinder of refrigerant, R22, to the pressure hose. Open the cylinder shutoff valve slightly to purge
the hose of air, then tighten the hose connection to the suction service valve gage port.
(2) Open both the service valve and the cylinder shutoff valves, and charge the system with refrigerant gas until
the gage on the discharge (high-pressure) service valve registers 70 PSI (5 KG/CM2). Close the suction service valve
and the cylinder shutoff valve.
(3) Transfer the charging line to a
cylinder of
dry nitrogen. Open the cylinder shutoff valve and the suction service
valve, and let nitrogen flow into the refrigeration system until the discharge pressure gage reads 350 PSI (21.44
KG/CM2). Turn off the suction and discharge service valves and the cylinder shutoff valve. Disconnect the charging line
from the suction service valve.
5-30