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Need Help finding right capacitors for compressor

hx214

Active member
Joined
Feb 24, 2012
Messages
26
Hello,

About a week ago my old dayton compressor burnt up and I found another compressor to replace it.

Well today my dad brings me over another dayton that was at his work that hadn't run in a while. They told him the capacitors needed to be changed out (don't know why or how they know) so I figured I give it a shot.

It is a Dayton, 20 gallon. I believe it is a 5.5 hp (The horsepower rating says SPL on the plate on the motor, but on the take it says 5.5) The motor is a dayton model number 9TC52 (Which I can't find listed anywhere)

I check through grainger and I'm having trouble even finding the compressor on the lists they have. The compressor I have has a black tank with a dayton sticker on it. The model number is 4b228a. Grainger has nothing listed for it, but they do have a Speedaire by Dayton with a model number of 4b228d shown here. http://www.grainger.com/Grainger/rp...esc=5.5hp+Air+Compressor&supp=20002433&save=1

I believe they are the same model in a different skin, but I could be wrong. Both seem to have a 5.5 hp motor stamp on the tank and have the same specs on scfm.

Here is my problem. I opened the capacitor shields and they look to be replacement parts. The start capacitor says Philips on it with a big "For Motor Starting" It has 165 VAC listed and 60 HZ then there is a 3629617. This seems to mean nothing to google, and I can't get a hit anywhere else.

The run capacitor has even less on it. It is a gray canister with small print on it. It lists....

20UF
370V
50/60HZ
70c
AEROMES II
0615

This also seems to mean nothing to google or grainger.

I have never replaced capacitors on a compressors, and not really sure what to look for. I noticed some of them have the same ratings and am assuming they are interchangable and the only difference I am seeing are size dimensions.

Can anybody point me in the right direction before I just order one and give it a shot? Haha.
 
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pattenp

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Jun 4, 2008
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Virginia - USA
You can replace with a cap of the same size using the volts and capacitance. So you need a 370V 20UF for the run. The start will have a volt and MFD rating, so that should be 165V ??-?? MFD.

Edit: UF and MFD are the same thing, but you find both of the ratings being used differently between run and start caps.
 
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Socophreak

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Jun 18, 2010
Messages
231
You're really looking for mf and voltage ratings. mf stands for microfarads, and its the ability for a capacitor to store a charge.

Run cap is a 20 microfarad 370V. Quick google showed one up on ebay for $12.50

The Philips is quite possibly a motor start relay. It may very well be a capacitor, but the ratings should be written on the can. Is there a wiring schematic on it? Would you be able to take a picture of it?
 
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hx214

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Feb 24, 2012
Messages
26
the compressor is out in my shop, i'll try to get a pic of diagram tomorrow.

I saw the MFD ratings on the capacitors online, but I couldn't find a rating on the ones I had anywhere. Would it be listed on the motor plate?

Thanks guys!
 
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hx214

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Feb 24, 2012
Messages
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Thanks nehog!

How about the start capacitor? (I'd like to switch them both out)
 

Gary S

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Dec 27, 2008
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Bismarck, ND
Take both capacitors to an electric motor shop and they will put new ones in your hand in minutes.
 
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hx214

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Feb 24, 2012
Messages
26
The only local shop that I know that would have them closes at 4pm before I get off of work and isn't open on the weekends.... otherwise it would have been done already.
 

pattenp

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Jun 4, 2008
Messages
10,175
Location
Virginia - USA
I think a start cap that is a 250VAC 161-193 MFD will work. I don't think you'll find a 165VAC so it's okay to up the voltage, don't go down on the voltage.

http://www.galco.com/buy/NTE-Electronics/MSC250V161
nte-capa-msc_p.jpg


*
 
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