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HVAC question

 
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Bill58
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PostPosted: Thu Jul 18, 2013 1:08 pm    Post subject:  HVAC question Reply with quote

I have a 23 year old whole house a/c unit. The motor run capacitors for compressor and outside fan are original. As they degrade over time, any thoughts about replacing the caps before they go bad? Any brand preference?
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Pitch Black SS
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PostPosted: Thu Jul 18, 2013 2:31 pm    Post subject:   Reply with quote

Guessing you are talking about electronic capacitors.

I can name a bunch of brands, but nothing anyone here (mostly) would have heard of. There are also all types of capacitors.... multilayer ceramic, ceramic disc, multilayer polyester film, tubular ceramic, polystyrene, metalized polyester film, aluminum electrolytic. Plus they are available in SMD, Thru-Hole, Axial and Radial construction.

Just dont buy cheap parts and you'll be ok. Quality costs money.

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Pitch Black SS
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Joined: Mar 08, 2004
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2004 Chevrolet Impala
1982 Chevrolet Malibu
2007 Chrysler 300C
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PostPosted: Thu Jul 18, 2013 2:32 pm    Post subject:   Reply with quote

and make sure they are fully discharged before working on them. They can kill you if they arent.

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Bill58
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PostPosted: Thu Jul 18, 2013 2:58 pm    Post subject:   Reply with quote

They aren't pcb caps but motor run caps. 35 uf @ 370 vac for the compressor and 3 uf @ 370 vac for the fan, physically large. Round 2" dia x 5" tall with 1/4" spade lug connectors. Motors will burnout if the cap fails.
Roger that on discharging.
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IffyG
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PostPosted: Fri Jul 19, 2013 12:04 am    Post subject:   Reply with quote

I can't tell you whether they degrade over time or not, but it there is any sign of the capacitor swelling, I'd recommend replacing it before it fails catastrophically. I had some minor issues with the HVAC at my last house and my landlord didn't seem to think a swollen capacitor needed to be replaced when the HVAC tech said it did. It finally let go when it was 109 degrees outside and I was without A/C for three days...

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