(5) Install the ferrule of the circuit breaker reset cable assembly through the hole in the lower left-hand
comer of the back panel. Secure with a lock-washer and panel mounting nut. Grip shaft in a copper strip held inpliers, and
screw on knob firmly.
(6) Align holes in back panel with holes in sides of casing, using at least two drift pins or the equivalent. Cut
temporary attaching wire or cord, and secure panel to casing with 23 blind rivets.
(7) Tighten screws in sight-glass liquid indicator bracket and pressure cutout switch housing to final torque.
(8) Install four screws and washers in top rail of condenser coil guard.
(9) Position the fresh air screen on uppright corner of back panel, and secure with five screws.
(10) Position the CBR cover on the upper left-hand corner of the back panel, and secure with five screws.
(11) Loosen four nuts attaching the fan motor flange to the partition if necessary to insert washer between
mounting feet of motor and motor mount assembly. Assemble mounting hardware as shown in figure 4-7. Select proper
thickness of resilient washer to fit. Tighten four nuts on motor flange when mounting is complete.
Do not hammer impeller onto motor shaft; motor bearings would be damaged. Dress out roughness
with a fine file, stone or abrasive cloth. Apply a coating of light machine oil to ease assembly.
a. Description. The air filter consists of a shredded aluminum foil maze held between screens an aluminum
channel frame. The filter can be cleaned and re-used repeatedly. Airflow markings (arrows) printed on the frame make it
easy to replace the filter in the correct position every time.
b. Removal. Remove the air filter for servicing and maintenance as direct in the following steps:
(1) Turn six cam-lock studs in the frame of the evaporator air intake grille counter -clockwise to unlock
them. Remove the grille.
(2) Remove two screws from the retaining strip at the right hand side of the air intake compartment. and
release the air filter. Pull filter forward and to the right to remove it from left-hand retaining channel.
Dry cleaning solvent (Fed. Spec PD-880) used to clean parts is potentially dangerous to personnel and
property. Do not use near open flame or excessive heat. Flash point of solvent is 100F to 138F (38C
c. Cleaning. Immerse the filter in detergent solution or dry cleaning solvent (Fed Spec P-D-680). Agitate until
dirt is removed, using a soft brush if necessary to loosen caked-on-dirt. Rinse in clearwater or clean dry cleaning solvent.
Drain, then hold filter horizontal and tap each edge on bench or floor to dislodge droplets.
d. Inspection. Inspect the filter for damage such as perforations or punctures in the screen and aluminum foil
maze that could permit passage of unfiltered air. Inspect for areas of packed or crushed maze material that would obstruct
airflow through the falter. Check for deformation of the frame. and straighten if possible without crushing maze material.
Replace filter if crushed punctured, badly deformed or broken.
e. Installation. Install the air filter in accordance with the following instructions:
Make sure that airflow arrows on frame point inward toward the fan intake when installing filter.
(1) Place the left-hand edge of the filter in the channel at the left side of the evaporator air intake chamber.
Install the retaining strip on the right-hand side of the filter, and secure with two screws.