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Air Compressor Capacitor

rage03usa

Member
Joined
Aug 28, 2015
Messages
5
In the fall I had an issue with my old Craftsman air compressor. It tripped the breaker one day and would no longer start. When turning it on, it would just make a buzzing sound. I left it as is and just got around to taking a look at it. When i pulled the cover off the motor i found one of the capacitors had melted.

After some research I discovered they no longer make them. I bought a replacement dual run capacitor with the same specs. The issue i have is the original capacitor does not have the connections labelled. There are 2 red wires that go to terminals right next to each other. Then there is a gray wire that goes to a terminal on the other side of the capacitor. One of the red wires goes to a switch on the motor cap that is activated when the motor is spinning.

The new capacitor has Com, Fan, and Herm labelled but I am not sure how that translated to the old capacitor. Does anyone happen to be familiar enough to tell me which wires need to go on which terminals on the new capacitor? :dunno:
 

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dogdog

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Nov 15, 2011
Messages
12,711
Can't help you in your particular case, definitely not from the pictures or your description.

Dual run capacitors are just means there are two capacitors build into one, it shares a common power input side..

The new ones you got are the same dual capacitors but most likely used in the HVAC industry for the traditional Air Condition refrigerant compressor.

are you sure you got the right one? Capacitor is capacitor perse, but you still have to make sure the capacitance you get matches closer to within 10% of your current value and the voltage rating is same or above its rating.....

if you are sure then usually on the HVAC compressors type setup... the FAN have lower capacitance the actual compressor motor have the higher setup... in your AIR Compressor the RUN capacitor usually have the lower capacitance capacitor and the start capacitor are the higher capacitance....

Of cause you needed to verify this... I don't think any one can do that from your pics or descriptions.



https://content.interlinebrands.com/product/document/10176/308676299_Owners.pdf
HERM, connects to the Hermetically Sealed Compressor
FAN, connects to the Condenser Fan Motor
COM, connects to the Contactor and provides power to the Capacitor.
 
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rage03usa

Member
Joined
Aug 28, 2015
Messages
5
I made sure the specs on the new capacitor match the old one. I just am not sure which wires would go on which terminals, or how to figure that out. The new one is 45+10 370vac 50/60hz just like the original. If the physical dimensions are off then I will just attach it externally. I find it odd that there are 2 capacitors and one is also dual run.
 
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