Capacitor Replacement On Central Air Unit - HVAC - DIY Chatroom Home Improvement Forum

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Old 08-17-2006, 06:54 PM   #1
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Capacitor Replacement on Central Air unit

I had a HVAC technician come out to fix my central air conditioner unit. He replaced the capacitor which fixed the problem but he used a higher voltage capacitor then the original capacitor. The original capacitor was a 40/5 MFD 370 volt and the tech put in a 40/5 MFD 440 volt capacitor. The air conditioner is working fine but I am wondering if that is going to cause any problems down the road. Will the higher voltage capacitor cause any problems?


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Old 08-18-2006, 07:20 PM   #2
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the new capacity can withstand higher voltage, when voltage reach 470volt come in it can withstand it,so no any problem wth your A/c


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Old 08-25-2006, 08:02 PM   #3
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I agree this is no problem since the new one is higher. viseversa would be a problem.
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Old 07-20-2012, 09:42 PM   #4
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Going with a higher voltage with the same mf rating is an acceptable practice. You may want to right a note of the original voltage rating and place it in the access panel in a plastic bag for the future. The capacitor will be fine for the next few years and cause no problems for the unit.
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Old 07-21-2012, 01:40 PM   #5
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You can replace a 370 VAC capacitor with a 440 VAC capacitor just not the other way around. Most techs only keep the 440 VAC's in stock on there trucks for this reason. It is not volts it is VAC and I don't rember exactly what the stands for but it is not just volts
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Old 07-21-2012, 01:55 PM   #6
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Is the case of the new one slightly larger than the old one?

This brings up an interesting question: depending on how much extra life the 440v gives and depending on how much the 440 costs, it may be routinely worth it to replace the lower voltage caps with higher voltage caps, maybe even above 440v.

Last edited by Yoyizit; 07-21-2012 at 01:58 PM.
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Old 07-21-2012, 02:29 PM   #7
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The voltage rating on run capacitors is just the internal electrical insulation rating. It has no effect on uf.


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