COMPRESSOR RUN CAPACITOR C4 INSPECTION, TESTING, AND REPLACEMENT

TM 9-4120-428-14

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UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

COMPRESSOR RUN CAPACITOR C4 INSPECTION, TESTING, AND REPLACEMENT

INITIAL SETUP:

Tools

Materials/Parts

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Capacitor

Equipment Condition

Remove Top Rear Panel (WP 0019 00)

HOUSING

BOTTOM PANEL (REF)

WARNING

Ground ALL capacitors before touching

INSPECTION

Check all capacitors for general condition and loose, broken, or damaged terminals.

NOTE

The ohmmeter test does not show the behavior of a capacitor under load. Such testing

requires special equipment, which is not economically practical for testing small

capacitors. Replace the capacitor if breakdown under load is suspected.

TESTING

1. Use a screwdriver with an insulated handle to discharge the capacitor.

2. Tag and disconnect ALL wire leads.

3. Use a multimeter set to read high resistance. Place the meter leads on terminals of the capacitor.

4. If the capacitor is good, the multimeter needle should move rapidly toward the low end of the scale, then slowly

return to infinity. If the needle moves to zero and remains steady, the capacitor is internally short-circuited. If the

needle does not move, the capacitor has an open circuit If a capacitor indicates a short circuit, an open circuit, or

other damage, replace the capacitor.

5. See WP 0028 00, Wiring Diagram. Connect ALL wire leads and remove tags.

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