How to size Cap. when no information available

[texasgentleman2]

Monday morning, went to my bosses rental property, found bad cap, but couldn't read anything on it due to rust, and no information was legible on the compressor either. It looked like a small unit, 1-2 ton split system, 208v. Put 7.5mfd on fan and a 50mfd on comp, system pulled right at 10 amps.
I understand that if the cap is oversized, it'll cause the comp to overheat, but it hasn't yet..

My question is, is there a way to figure out what capacitor to use in situations such as this?

Thank you gentlemen

[whitextreme]

If there is no information available on the machine you can call your local dealer with tghe model number and serial number and they can tell you what capacitor should be on there.

[chuckcrj]

Could you read the model number on the unit?

What tonnage was it?

[Ron223]

If there is no information available on the machine you can call your local dealer with tghe model number and serial number and they can tell you what capacitor should be on there.

+1

[Kevin Weaver]

Monday morning, went to my bosses rental property, found bad cap, but couldn't read anything on it due to rust, and no information was legible on the compressor either. It looked like a small unit, 1-2 ton split system, 208v. Put 7.5mfd on fan and a 50mfd on comp, system pulled right at 10 amps.
I understand that if the cap is oversized, it'll cause the comp to overheat, but it hasn't yet..

My question is, is there a way to figure out what capacitor to use in situations such as this?

Thank you gentlemen

sounds like you were guessing on what size capacitor to install. If I was to guess i would of tried a 35+5 capacitor. Seems to be very common on small a/c's. Possibly look at fan motor and it just might say what size capacitor the motor would take.

[cboe]

or even smaller than a 35+5!!

[texasgentleman2]

Didn't see model, or even a Brand label on the unit. From the size of it, I'd guess 1 maybe 1.5 ton.

[texasgentleman2]

Yes Sir, it was pretty much a guess. I hate to do something like that, but it was a size I had available and I thought if it was too far out, the amps would tell me.

[small change]

what about the evaporator coil?

Sometimes you can get lucky there

Did it have a txv?.....leave no stone unturned...lol

[texasgentleman2]

what about the evaporator coil?

Sometimes you can get lucky there

Did it have a txv?.....leave no stone unturned...lol

Didn't think about looking there..

[Eddie1KRR]

Last time this happened to me it was after hours & I had no one to call. Could not read the cap or the name on the plate. I got lucky though. I could read the tag on the fan motor to know that side was a 5.
Then, it came to me after a bit and almost surrendering to taking my best guess. I googled model number on the stamped plate on the top of the compressor and was able to find the cap size that way. It took some digging, and was slow since it was from my phone, but eventually I found it and was able to verify it against a second source, so I felt ok about it.

[upant]

I'd say you went a little high on the compressor. But as long as it's running ok. I guess your safe. I believe if your under sized the compressor will overheat. If you dig around that compressor long enough you'll find numbers.

[catmanacman]

As long as its the bosses house who cares he can afford a new compressor