TM9-4120-400-14
4-36. CAPACITORS C2 AND C3, single phase units only. - continued
Ground all capacitors before touching.
INSPECTION
Check 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.
If breakdown under load is suspected, replace the capacitor.
TESTING
1. Tag and disconnect leads.
3. If capacitor is good, multimeter needle should move rapidly toward low end of scale then slowly return to
infinity. The capacitor is internally short circuited if needle moves to zero and stays there. The capacitor has
an open circuit if the needle does not move. Replace if capacitor indicates short circuit, open circuit, or has
other damage.
4. See the wiring diagram figure 4-4 and tags and connect the wire leads. Remove tags.
REPLACEMENT
1.
Using a screwdriver with an insulated handle, discharge capacitor.
2.
Loosen four screws (1) securing strap (2) holding evaporator run and condenser run capacitors (C2 and C3)
(3) to top rear panel. Do not remove strap.
Remove capacitors by sliding out from under strap. Retain insulator pad (4) from between capacitors.
3.
4. Tag and disconnect leads.
Place capacitors (3) and insulation pad (4) into strap (2).
5.
6. See the wiring diagram figure 4-4 and tags and connect the wire leads. Remove tags.
7.
Tighten four screws (1) scouring strap (2) holding capacitors (3).
NOTE
FOLLOW-ON MAINTENANCE:
4-90