Who has a Supco Hard Start on their A/C unit?
I recently purchased the Supco SPP6 hard start capacitor and I have a couple questions for those who have this unit and have also installed it themselves. First off, even though I've read on this f...
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Dave 17352 has the best setup. I would leave it alone if the caps check out good and the potential relay is working right. A potential relay senses the voltage as it comes up in the start winding and opens the start cap circuit at the right time. PTC (positive temperature coefficient) relays are a cheap inferior replacement for the bulletproof potential relay configuration.
Katoom, I wouldn't replace oem components, if they were working OK, with aftermarket parts with different values unless it was the last resort to aid a hard starting compressor or maybe help out generator starting.
These are PSC (permanent split capacitor) motors, meaning they are split phase, having a start and a run winding and the run capacitor is permanently connected between the run and start terminals. The run cap provides a controlled amount of power to the start winding to get the rotor turning, tell the rotor which way to turn and improve motor efficiency.
The start cap parallels the run cap via a potential or PTC relay and it's only in the circuit, momentarily on start up, to give the rotor extra kick.
Without hard start components, PSC motors have very low starting torque and low voltage, unequalized refrigerant pressures or a sticky, tight turning rotor will prevent them from starting. That's when the motor cycles on the overload until it can start or something burns up.
I hope PSC motors 101 helps! Craig
Katoom, I wouldn't replace oem components, if they were working OK, with aftermarket parts with different values unless it was the last resort to aid a hard starting compressor or maybe help out generator starting.
These are PSC (permanent split capacitor) motors, meaning they are split phase, having a start and a run winding and the run capacitor is permanently connected between the run and start terminals. The run cap provides a controlled amount of power to the start winding to get the rotor turning, tell the rotor which way to turn and improve motor efficiency.
The start cap parallels the run cap via a potential or PTC relay and it's only in the circuit, momentarily on start up, to give the rotor extra kick.
Without hard start components, PSC motors have very low starting torque and low voltage, unequalized refrigerant pressures or a sticky, tight turning rotor will prevent them from starting. That's when the motor cycles on the overload until it can start or something burns up.
I hope PSC motors 101 helps! Craig
