Compressor - Cornelius IAC322 Pocket Manual

the rating on the defective original capacitor being replaced. Voltage
should always try and be matched, if it cannot be it is acceptable to
increase up to 10% higher than the voltage listed on the capacitor be-
ing replaced. NEVER put a capacitor on a product with a voltage
rating lower than the original being replaced. If a capacitor analyzer
is not available, an ohm meter may be used to check a capacitor for
short or open circuits. Set the ohm meter to its highest scale and con-
nect its leads to the capacitor terminals.
1. With a capacitor, without plate defect, the indicator
should first move to zero (0) and then gradually in-
crease to infinity.
2. If there is no movement of the ohm meter indicator, an
open circuit is indicated.
3. If the ohm meter indicator moves to zero (0) and re-
mains there, or on a low resistance reading, a short
circuit is indicated.
4. Please note this check does not determine if the capac-
itor will deliver the proper rated MFD/UFD required, it
only shows if the capacitor has shorted or open cir-
cuits.
5. Capacitors that show any signs of leakage of electro-
lyte, or damage of the can, should be replaced. DO
NOT TEST!

Compressor

1. Using an ohm meter, check for continuity from com-
pressor terminal C to R and C to S. If the compressor
is hot, wait one (1) hour for compressor to cool and
recheck. An open internal overload protector can
cause a lack of continuity. If continuity cannot be mea-
sured through all windings, the compressor must be
replaced.
2. To check the compressor motor for accidental ground,
perform a continuity check between terminals C, R
and S to the compressor shell or a copper line of the
refrigeration system (do not use a painted surface).
Continuity present, the compressor windings are
grounded and the compressor must be replaced.
If the compressor starts, but trips repeatedly on the overload protec-
tor, remember that the overload is both temperature and current acti-
vated. Be sure to check; (Continued on page 49).
S
Low voltage
S
Undersized supply lines
S
High head pressure
S
High suction pressure
S
Defective capacitors
49 TD 204