TM 9-4120-357-14
f. Assembly. Assemble the fresh air damper control in
accordance with the following steps: (See figure 4-6.)
(1) Attach the bracket (8) to the step plate (7), and secure with four screws and self locking nuts.
(2) Place worm gear (11) in bracket (8), with a spring washer (14) and flat washer (13) at each end of worm gear.
Push operating shaft (16) through bracket, spring washers and worm gear until pin holes in worm gear and shaft are
aligned. Press spring pin (12) into holes.
(3) Attach actuator arm (A, 18) to worm wheel gear (17) with three screws (20) and lock washers (19).
(4) Place actuating arm assembly (A) in bracket assembly with a spring washer (24) on each side, and a spacer
(23) between each spring washer and the bracket. Insert bolt (15) through the aligned holes, and assemble the flat
washer and self-locking nut on threaded end of bolt. Tighten nut until a slight drag is felt when rotating the operating
shaft.
(5) Install ball joint through hole in end of the actuator arm.
(6) Install the operating shaft assembly into the air conditioner casing through the outside air intake opening. In-
sert the long end of the shaft into the grommet (10) and hole in the front of the casing. Fit the short end of the shaft into
the grommet and hole in rear of casing.
(7) Attach the step plate (7) to the floor of the compartment with four screws, washers and self-locking nuts.
(8) Attach hinges of damper plate (6) to flange of fresh air baffle (5) using six screws, washers and self-locking
nuts.
(9) Install ball joint in bracket on damper plate, and secure with self-locking nut. Insert connecting rod (26) into
hole in ball joint, and lock in place.
(10) Install baffle and damper plate assembly in casing. Position outside screen (4) on baffle, and secure with 12
screws and washers.
(11) Insert free end of connecting rod in hole of ball joint on actuator arm, but do not tighten locknut at this time.
(12) Plate knob (9) on both ends of the operating shaft, and tighten setscrews.
(13) Turn the operating shaft (16) as necessary to place the actuating arm (A, 18) in a vertical position. Press
the damper plate (6) closed, and tighten the locknut on the ball joint.
(14) Turn the operating shaft (16) through a full cycle of opening and closing the fresh air damper. Make final
adjustments if necessary.
(15) Position the condenser coil inlet screen (2) on
the unit, and secure with 12
screws.
(16) Position the evaporator air intake grilles on
front of
unit, and secure with 12
screws and washers through the
frame of each grille.
4-27. Mist Eliminator.
The mist eliminator is a fine-mesh screen (1, Figure 4-7) which is located between the evaporator coil (2) and the
evaporator air outlet grille. Its purpose is to trap droplets of condensate water formed on the evaporator coil to prevent
their being blown through the grille into the room. The mist eliminator must be inspected and serviced periodically to
prevent clogging. Proceed as follows:
a. Removal. Remove 16 screws and washers from the frame of the evaporator discharge grille, and remove the
grille. Remove 22 screws and washers from the top, and nine screws and washers from the rear flange of the top panel,
and lift the top panel off of casing. Slide the mist eliminator up, out of guides, to remove.
4-30