Run Capacitor Blew Up Caught Fire In AC Unit. - HVAC - DIY Chatroom Home Improvement Forum

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Old 07-01-2010, 08:18 PM   #1
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run capacitor blew up caught fire in AC unit.

I have a 10 year old rheem 4 ton unit. Came home and fan wasnt spinning outside in the ac unit. The motor was HOT.

Opened up the first panel to find a capacitor expanded and black with chared paper wiring sticker. The capacitor is a 2 connector 370-400V 7.5.

I tested the fan by hooking it up to the pool 220V and it works fine.

When the capacitor was blown the motor hummed without spinning.

I tested the fan by splicing the brown and (brown and white) wires that were on the capacitor and connecting white and black to the 220 current.

In short my question:

Is this just a bad 10 year old chinese capacitor? or did the capacitor blow due to some other reason.

will another one pop as soon as i put it on?

THe " large" 3 connector capacitor looks fine ( the one mounted into the connection box.

The remanants of the fire inside that scorched the stickers from the oil expodign in the capacitor is what makes me nervous.


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Old 07-01-2010, 09:06 PM   #2
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Cheap capacitors. I change lots of them.


"Cut it twice and it is still too short".
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Old 07-01-2010, 09:08 PM   #3
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Rheem used some real crappy capacitors from China and Mexico. My unit used an Aerovox plastic capacitor made in Mexico that failed after a mere 3 years!!

I suggest you replace your units capacitors with made in the USA Amrad caps.

If you simply replace the cap. with a generic equivalent then it could have the same problem.

I generally like Rheem but their choice of capacitors was terrible.
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