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Help with correct capacitor size for home HVAC -- Lenox and Carrier

Lenox 10HPB42-11P Carrier 38CKC048-371

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10 replies to this topic

#1 cninham

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Posted 26 June 2012 - 05:07 PM

Can someone please help me verify the correct capacity for the motor run capacitor for two HVAC units that I have, please? I believe the AC service technician replaced BOTH units with the WRONG capacitor size.

AC Unit # 1

Lenox 10HPB42-11P
Capacitor – I believe this should be a 40+5 MFD capacitor
Service technician installed a 50+7.5 MFD capacitor

AC Unit # 2

Carrier
Prod: 38CKC048-371
Model: 38CKC048370 / 38CKC48370 / 38CK048370 (???)
Capacitor – I believe this should be a 40+5 MFD capacitor
Service technician installed a 40+3 MFD capacitor

Thank you,

Cameron

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#2 RegUS_PatOff

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Posted 26 June 2012 - 09:16 PM

Fan Motor Capacitor rating is dependent on actual Fan Motor installed.
.

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#3 cninham

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Posted 27 June 2012 - 07:17 AM

Thank you for the reply -- in both cases the fan motor is the original motor and the AC unit is "standard" with nothing changed.

Any idea where I can get the capacitor information from, please?

Thanks -- Cameron

#4 jumptrout

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Posted 27 June 2012 - 12:55 PM

The fan motor will have the cap rating printed on it.

#5 cninham

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Posted 27 June 2012 - 01:02 PM

Thanks -- I got the fan motor capacity rating from the motor as suggested.

How do I get the compressor (HERM) capacitor rating?

Cameron

#6 RegUS_PatOff

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Posted 27 June 2012 - 03:12 PM

my research finds:

AC Unit # 1
Lennox 10HPB42-11P
80K48 40/5 440v


AC Unit # 2
Carrier
38CKC048370
P291-5054RS 50/5 440v
.

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#7 cninham

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Posted 27 June 2012 - 04:00 PM

Thank you! Very much appreciated!

On the 2nd unit, the Carrier, Prod: 38CKC048-371, Model: 38CKC048370, I have received conflicting information. Some other forums have stated the capacitor to be:

45+5 MFD, 440 VAC

Would the discrepancy/difference between the two matter? Is it safer to go with the 45+5 or 50+5 MFD...?

Thanks -- Cameron

#8 RegUS_PatOff

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Posted 27 June 2012 - 04:42 PM

+- 10% should be OK .

.38CKC048370 P291-5054RS
http://parts.sears.c...CKC048SERIES370
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#9 jumptrout

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Posted 27 June 2012 - 07:38 PM

The 10% mentioned by Reg is good info.
The real important part is the 370vac/440vac capacitor.
Any system can run fine with a 440vac.
If a system specifies 440vac it will not run correctly on a 370vac.

#10 cninham

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Posted 27 June 2012 - 08:02 PM

Again, THANK YOU to everyone for your information and help. It is very much appreciated.

Cameron

#11 beam current

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Posted 04 May 2013 - 02:57 AM

I know this is an old posting, but may help someone else reading it.  It's a pain to do, but to be absolutely sure of the capacitance for the compressor, you could remove fan from top of condenser unit and look at the sticker on the compressor. Most Copeland scrolls (very common) and other mfg's have the cap rating on this sticker.

 

Hope this helps.


I think this will work. I once saw it on a cartoon.

Or, on the other hand.....

Troubleshooting the appliance's complex electro-mechanical systems is the methodology in which one must, by using analyitical techniques and the process of elimination, determine the cause or causes of a specific failure. Rarely does this cause of a failure directly present itself for you to see.

So.....

To be better equipped to troubleshoot, you will need:

1.) To follow this: Safety first and foremost. Trust your instincts.
2.) Basic hand tools.
3.) A decent DVOM meter. Buy one. Borrow one. You need one.
4.) Last, but certainty not least, common sense. Most of us have it. Slow down and use it.

Now, let's have some fun!

ZIG:
Hope is the power that gives a person the confidence to step out and try.
Success is the maximum utilization of the ability you have.

N.M.:
It always seems impossible until it's done.




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