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1 6
Section C - Electrical Components
6.
If ohm readings are out of range, replace capacitor.
7.
Reverse procedures to re-assemble.
Figure C3
Figure C4
Compressor Operating Characteristics
•
When the compressor electrical circuit is energized, the start winding current
causes the relay to heat and switch off the start winding circuit.
N OTE
The relay will switch off the start winding circuit even though the
compressor has not started (as when attempting to re-start after momentary
power interruption).
•
The overload protector is designed and calibrated to open the compressor
electrical circuit with locked rotor run winding current only.
Compressor Start Circuit
When the compressor circuit is first energized, the solid
state relay has low resistance (3-12 ohms), and both the
run and start windings are energized to start the
compressor. The run capacitor is being bypassed by the
relay, and it has a minor function during compressor
starting. (See Figure C3.)
Compressor Run Circuit
When the self-heating solid state relay has reached
sufficient temperature, it will abruptly change from low
resistance (3-12 ohms) to very high resistance (10-20K
ohms) and, in effect, switches off the start windings.
The relay no longer shunts the run capacitor. The run
capacitor is now in series with the start windings. The only
purpose of the run capacitor is to improve
compressor operating efficiency, which it does by correcting
the power factor of the compressor motor. (See Figure C4.)
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