Q: DINGFENG CAPACITOR - My ceiling fan's capacitor is of 2.25 UF. I can connect a capacitor of 2.5 UF?
A: All motors including fan motors are designed for optimum performance for their applications, supply conditions and variations. Any deviations will cause it to degrade the performance, depending upon how much the deviation us. This factor includes any deviation from design phase angle difference between main and auxiliary windings.
2.25 UF capacitor , taken with tolerance limits of 5%, comes closer to 2.5 UF lower limits, but if 2.5 UF tolerance is on higher side of tolerance, it will cause a deterioration in performance. Of course, 2.5 UF capacitor gives a little higher fan speed, at least at the time it is connected.
Most capacitors in fans today use Metallized capacitors, which have a tendency to reduce in value over time - though it takes a few years for a good product. When this happens, fan speed goes down
Electricians, sometimes even engineers, have developed a habit of using 2.5 UF to replace 2.25 UF, the logic being its value will come within limits of 2.25 UF after reducing, and will last longer.
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