Dual start/run capacitor?


Old 08-27-15, 06:15 PM
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Dual start/run capacitor?

I've been boning up on HVAC capacitors and I thought I understood the basics. A start capacitor gives a motor a bit of a push to get it started, a run capacitor keeps the motor running without any up or down spikes, and a dual run capacitor is just two run capacitors in one housing - one for the fan and one for the compressor. But this site seems to be saying that a dual run capacitor is a start capacitor and a run capacitor in a single housing. What's going on?
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Old 08-27-15, 06:30 PM
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You had it right. Don't believe every site that you run across.

It almost seems like that was translated.

I run across many belt drive motors that have a start cap and a run cap. (CSR). Capacitor start and run.
I wonder if that is what the original message was trying to refer to?

Most belt drive motors that I use have a start cap but no run cap (CSiR). capacitor start / induction run

Most residential outdoor fan motors have a run cap but no start cap. (PSC) permanent split capacitor

A shaded pole motor doesn't use a cap at all. Bathroom exhaust fans are usually shaded pole.

That greasy looking Global run cap is a terrible product.
I backed my van up to a dumpster and tossed every one I had because they usually failed in less than 6 months.
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