TM 9-4120-357-14
(9) Remove the motor mount assembly (rear panel) as
follows: (See Figure 4-5).
(a) Remove six screws from bottom flange of motor mount assembly, and place wood blocks under the fan
shroud for support during further disassembly.
(b Remove four screws from top and bottom of pressure cutout switch enclosure attachment to rectangular
panel.
(c) Disconnect grounding stud and cable by removing a screw, two nub and five washers from rectangular
panel.
(d) Pull circuit breaker control cable all the way out. Grip shaft with a brass or copper strip held in a pair of
pliers, and unscrew operating knob from shaft. Remove nut, jam nut and lock washer from ferrule of control cable, and
push cable assembly inside the panel.
(e) Disconnect wiring harness plug, P2, from receptacle on
condenser fan motor.
(f) Remove nine screws from each side flange of the rear panel, and carefully work the entire motor
mounting bracket (rear panel) assembly off the casing with the help of an assistant. Store on corner wood blocks, outer
face down.
(10) Remove evaporator blower assembly as
follows: (See Figure 4-15).
(a) Disconnect wiring harness plug, P9, from receptacle in wall of left-hand return air plenum.
(b) Remove fan inlet rings from the walls of both return air plenums by removing four screws, and four each
of two kinds of flat washers from the flange of each ring.
(c) Remove four capscrews and washers from the motor mount. Remove the blower assembly, including
motor, mounting bracket and both impellers.
(11) Remove heater assembly as
directed in
the following steps: (See Figure 4-14).
(a) Disconnect wiring harness plug, P7, from receptacle on wall of right-hand return air plenum.
(b) Remove two screws which secure the heater mounting bracket, from the inner front wall of each return
air plenum. Remove the heater assembly by pulling it straight up.
(12) Tag all wiring harness interconnections, disconnect and remove. Remove grommets from partitions, and
leave on wiring harnesses for use at assembly.
(13) Remove the junction box and control panel assembly as a unit. Being careful to avoid kinking the control
thermostat's capillary tube as you lead it from its mounting in the evaporator intake chamber. Remove six screws from
casing and mounting flange, and two screws and washers from the mounting bracket. Remove the loop clamps holding
the circuit breaker flexible cable. Leave loop clamps on cable for use at assembly.
(14) Unscrew flare nuts at the pressure cutout switch connections to refrigeration piping. (See 13 & 14, Figure
4-12). Cut or
remove supporting tape from capillary tubes, and remove pressure switch assembly as a
unit.
(15) Unscrew flare nuts (9, Figure 5-2) from top and bottom of
drier-strainer (dehydrator) (8). Remove a
screw,
nut and washer from band clamp (10) and remove drier-strainer and clamp from casing. Discard drier-strainer.
(16) Remove the mist eliminator (1, Figure 4-7) by
pulling straight up. Remove four screws from the mounting
(17) Remove two capscrews from the bracket of
the evaporator coil expansion valve (14, Figure 4-7). Remove
two capscrews securing the power assembly to the valve body.
(18) Unscrew the flare nut of the equalizer connection to the expansion valve bonnet.
(19) Carefully remove the expansion valve sensing bulb and capillary tube from their attachment to the suction
line, and remove the expansion valve power assembly.
CAUTION
Maintain a 1-2 CFM (0.5-1M3) flow of dry nitrogen through the refrigeration system to
prevent oxidation and scaling when brazing or debrazing components.
(20) Debraze the valve body from the liquid line.
6-4