TM 9-4120-357-14
accordance with the following table:
(a) Place the sensor bulb in a container of warm water (851 00 or 30400C). Check the continuity of the
-
F
-
red and yellow contacts throughout the decrease range. Continuity should be shown.
(b) Place the sensor bulb in a container of cold water (40-65 or 5-18 ). Check the continuity of red and
F
C
blue contacts throughout the increase range. Continuity should be shown.
(3) Check the continuity of
wires from terminal to
terminal in
the wiring harness.
e. Assembly. Assemble the control panel as follows:
(1) Place a lock washer (11) and flat washer (12) on screws (10), and install in a control panel. Install a flat
steel washer (12) nut (16), two aluminum flat washers (17), lock washer (11) and self-locking nut (18) on outer end of
screw.
(2) Install wiring harness (9) in box (15), with the two beveled spacers (8) oriented so that the thin edge of the
outer spacer is toward the front of the control panel, and the thin edge of the inner spacer is toward the rear of the box.
Secure with four screws and self-locking nuts.
Table 4-3. SWITCH POSITIONS
Contact
1
2
3
4
5
Unit
Number
Hi Heat
Lo Heat
Off
Ventilate
Cool
S/W 1
12 & 1A
Closed
Closed
Open
Open
Open
12 & 1B
Open
Open
Open
Open
Closed
11 & 1D
Open
Open
Open
Open
Closed
S/W 2
22 & 2B
Closed
Closed
Open
Closed
Closed
S/W 4
41 & 4C
Closed
Open
Open
Open
Open
(3) Make electrical connections to the selector switch (4) and attach the grounding wire to the grounding stud
assembly with terminal between the two aluminum washers (17).
(4) Make electrical connections to the temperature control thermostat (5), and attach thermostat to the rear
cover (2) with four screws and self-locking nuts.
(5) Install the mode selector switch (4) in the box (15), and secure with lock washer and mounting nut.
(6) Split a grommet (3) and place it over the capillary tube of the thermostat, then insert the grommet and tube
in the notch in the rear cover (2). If the control panel is to be used in a remote location, attach the sensor bulb to the rear
cover with a loop clamp, screw and flat washers.
(7) Install the rear cover (2) on the box (15), guiding the shaft of the temperature control thermostat through the
hold in the box. Secure the rear cover with four screws and self-locking nuts.
(8) Install knobs (14) on shafts, and tighten setscrews.
f. Installation.
CAUTION
Handle the capillary tube carefully during installation. To prevent kinking.
(1) Lead the sensor bulb of the temperature control thermostat carefully through the hole in the casing partition.
Attach it to the filter channel with a loop clamp, screw and self-locking nut. Split a grommet from the center out, and
place around the capillary tube in the hole.
(2) Attach the control panel assembly (figure 4-9) to
the mounting flanges on
top of
the junction box. Secure
with four screws (7).
(3) Connect plugs of wiring harness to the receptacle on control panel assembly.
(4) Install the front access panel on the air conditioner by placing the lower edge behind the step of the base
plate. Push panel into position, and secure with four captive panel fastener screws.
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