TM9-4120-400-14
4-38. COMPRESSOR RUN CAPACITOR C4, single phase units only. - continued
TESTING
Using a screwdriver with an insulated handle, discharge capacitor.
1.
Tag and disconnect leads.
2.
Using a muitimeter set to read high resistance, place meter leads on terminals of capacitor.
3.
If capacitor is good, muitimeter needle should move rapidly toward low end of scale then slowly return to
4.
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.
5. 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.
Position unit on blocks. Loosen two screws (1) securing straps (2) holding compressor run capacitor (C4) (3)
to bottom housing panel. Do not remove straps.
Remove capacitor (3) by sliding out from under straps.
3.
4. Tag and disconnect leads.
Place capacitors (3) into strap (2).
5.
See the wiring diagram figure 4-4 and tags and connect the wire leads. Remove tags.
6.
Tighten two screws (1) securing straps (2) holding capacitor (3) to bottom housing panel.
7.
NOTE
FOLLOW-ON MAINTENANCE:
Install top rear panel (para 4-11).
4-94
