TM 9-4120-360-14
5.12. Installation
Install the junction box in the air conditioner as directed in the following steps:
a. Connect wiring harness plugs, P2 and P3, to their respective receptacles on the junction box.
b. Insert the end of the circuit breaker reset cable (8, figure 5-2) through the hole in the connector plate (7).
Install core end fitting on end of cable, then attach the sheath of the cable to the junction box with two loop clamps (9) and
screws, leaving at least 1/4-inch of cable sheath below the bottom loop clamp.
c. Attach the junction box to the support brackets, using four panel fastener screws.
d. Adjust the cable and fitting on the circuit breaker reset cable so that there is 0.12-0.25 inch (3-5mm) between
the end fitting and the connector plate when the circuit breaker handle is down and the flexible cable fully extended.
Tighten the setscrew in the end fitting, and bend 0.12-0.25 inch (3-5 mm) of the end of the cable 90 degrees.
Section III. RFI FILTER
5.13. Description
Essentially, suppression of radio frequency interference (RFI) is attained by providing a low-resistance path to ground
for stray currents. The methods used include shielding the ignition and high-frequency wires, grounding the frame with
bonding straps, and using capacitors and resistors. The air conditioner's RFI filter consists of a 73 uH choke coil in series
with each phase, and capacitors between phases and between each phase and ground. The RFI filter is housed in a metal
box mounted at the lower middle of the right side of the casing. It is connected into the power input circuit by means of two
wiring harness receptacles.
5.14. Removal
Remove the radio frequency interference (RFI) filter from the air conditioner as indicated in the following proecdure:
(see figure 5-3).
WARNING
Disconnect power from the air conditioner before performing maintenance on electrical components. The
voltage used can be lethal.
a. Remove eight screws from the four edges of the filter mounting plate.
b. Pull the filter housing and mounting plate outward as far as possible, and disconnect electrical plugs, P10 and
P11, from receptacles on the top of the filter housing.
c. Remove six screws near the top and bottom edges of the mounting plate to release the filter housing. Separate
the housing from the mounting plate.
5.15. Inspection/Test
Inspect the housing and mounting plate for physical damage such as dents. punctures or cuts. Look for evidence of
overheating or burning, melted potting compound, arcing at terminals, etc. Replace the filter if such evidence is fared.
Check point-to-point continuity between connector pins as shown in the following Table:
