TM 9-4120-357-14
(3) Remove the flexible cable from the circuit breaker actuator arm (15, Figure 4-3) as
follows:
(a) Loosen the setscrew in the end of the cable core end fitting (14) and slide the end fitting off of the cable
core. Withdraw the cable core from the actuator arm, and replace core end fitting for safekeeping.
(b) Remove two screws and washers from the cable clamp (16), and move the cable aside. Replace the
clamp (16) two screws and washers on the junction box for safekeeping.
(4) Remove six screws (7) from side of casing, and remove two screws (8) and washers (9) from lower right
mounting bracket on junction box. Remove the junction box and control panel assembly from the air conditioner, and tie
the wiring harnesses out of the way.
(5) Cut insulating material away from compressor suction line and sensor bulb of expansion valve, V4. Remove
clamp, and coil the capillary tube out of the way.
b. Removal of Compressor. Remove the compressor from the air conditioner as directed in the following pro-
cedure:
(1) Discharge refrigerant gas from the system in
accordance with paragraph 5-6.
(2) After the refrigerant is
completely discharged, connect a
cylinder of
dry nitrogen to
the gauge port of
the dis-
charge service valve. Open the suction service valve completely to the backseat position, and open the discharge serv-
ice valve and cylinder shutoff valve slightly to establish a flow of nitrogen through the system for 3-5 minutes.
(3) Debraze refrigerant connections to the compressor.
NOTE
Connections may be debrazed at any convenient point that will
permit removal of the compressor. Tubing and fittings that remain
attached to the compressor may be transferred to the new unit on
the bench before it installed.
(4) Attach a hoist and sling to the lift eyes on each side of the air conditioner. Insert a spreader bar between the
sides of the sling. To prevent damage to the casing, and lift the entire air conditioner high enough to permit timbers or
blocks to be placed under the base, at least eight inches high. Keep bolt hole openings in the base plate free, and let the
air conditioner down to rest on blocks. Keep tension on hoist to prevent the unit from tipping.
(5) Remove four shoulder bolts from the compressor mounting feet by inserting a socket wrench through holes in
the base plate. Nuts are welded to the upper surfaces of the feet.
(6) Reposition the air conditioner on the floor, and slide a 2 x 4 about four feet long, or a similar board, under the
compressor to act as a skid. Place another short length of 2 x 4 under the first, even with the front of the base plate.
(7) With the help of an assistant, lever the compressor up and pull it out of the air conditioner.
c. Installation of Compressor. Install compressor in air conditioner in accordance with the following steps:
(1) Attach tubing and fittings removed with the previous compressor, and braze joints as required.
(2) Place a
steel washer (10, Figure 4-12) and rubber washer (11) on
each of
the four shoulder bolts (13).
(3) With the air conditioner hoisted onto blocks, insert the bolts, steel washers and rubber washers through the
compressor mounting bolt holds from the bottom of the base panel. Install another rubber washer and spacer (12) on the
bolt from above.
(4) With the air conditioner on the floor, place the compressor assembly on a 2 x 4 or similar skid, and work it into
position in the casing with the mounting feet over the shoulder bolts and the proper tubing connections made.
(5) Hoist the air conditioner onto blocks, and install the shoulder bolts (13) into the mounting feet of the compres-
sor.
(6) Connect a
cylinder of
dry nitrogen to
the suction service valve, open both service valves and the cylinder shut-
off valve to establish a 1-2 CFM (0.5 -1 M3). Braze tubing connections.
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