motor capacitor

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  #1  
Old 08-31-09, 02:49 PM
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motor capacitor

What would be the implications of using a 5 UF/370 volts capacitor on a motor, when the motor calls for 6 UF/370 ?

The motor is the vent motor on a power vent water heater, so certainly if the motor speed or cfm was affected a lot, we would not want to do that.
 
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Old 08-31-09, 03:08 PM
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This is a run capacitor and there is generally no tolerance allowed like in a start capacitor. Run capacitors are energized at all times while the motor is running and are critical at keeping the motors magnetic field level or stable. An improperly sized run capacitor is risky business, The motor could overheat and burn up, it could become noisy/vibrate and generally will not last long if they do run for a while.
 
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Old 08-31-09, 03:34 PM
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Agreed. If a 5uf was called for and you temporarily substituted a 6uf it could work, but not the other way around.
 
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Old 08-31-09, 05:46 PM
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That one of my golden rules with single phase motor with either starting or running capaitor always replace the same size or next size up but nothing under the manufacter specs for the capaitor sizing.

ditto with voltage rating as well some case you will see diffrent voltage rating as well.

Merci,Marc
 
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