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On top of the capacitor you will find the terminals marked. One will say C, or Com. The others will be marked fan and herm. There will be a hot wire going to C. Usually this comes of the top of the contactor and is red. Find the wire that runs to the compressor. It will likely be yellow. This will hook to the Herm. Next find the fan wire (probably brown) it will hook to the fan. Hope this helps.

Posted on Jul 14, 2010


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1 Answer

What start capacitor is used on the Trane XE1100 air conditioner

There is NO START capacitor on your unit. There is a RUN capacitor and one place said it is a 30 mfd / 5 mfd at 440 volt. These are an oil filled capacitor with both a 5 mfd section for the fan and a 30 mfd forthe compressor. Find a part number on it and search Ebay... that is where I got mine..

Aug 02, 2012 | Heating & Cooling

1 Answer

My goodman unit wants to start and the contactor is not engaged

Could be the run capacitor is bad. Usually they bulge at the top where the connections are, but sometimes they are bad but appear to be fine physically. You would need a multimeter that reads microfarads to see if yours if good.
Below is a link to the part in question. Yours should be rated at 50/5 mfd, 370 or 440 volts.
50/5 MFD 440 Volt Round Dual Run Capacitor

May 22, 2012 | Goodman CKL42AR42 Air Conditioner

1 Answer

Have a ck36-1b goodman ac unit need to replace dual run capacitor i have nothing to tell me volts or mfd. any place to find spec for unit?

you need a 5/45 x 370 volt mfd capacitor. I just installed one in the same type of AC today. 5 mfd is for the fan moter and 45 mfd is for the compressor, the 370 is the voltage.

Sep 14, 2011 | Heating & Cooling

1 Answer

Does a gemtech 40 + 5 mfd work with a comfortair

Hi, as long as the 40uf x 440 volts and 5uf x 440 volt capacitor are the same is what you are replacing, yes it will work. Don't replace this 40 uf x 440 volt with a 40 uf x 370 volt cap. Voltage and microfarads must be the same, brand name makes no difference or these numbers, only the uf and voltage. Must be a 40 uf x5 uf, 440 volt dual run cap. It will work if the unit you want to put it on calls for that cap. The comfortair is a 3 ton unit, just be sure it takes a 40x5x440 volt and it will be fine.

Jun 04, 2010 | Heating & Cooling

1 Answer

The unit is not getting cool

have you cleaned the evaporator and outside condenser coils lately,try this first, then check unit pressures with a manifold gauge, also if compressor doesnt run but outside fan runs,it could be your compressor start capacitor,normally its a dual stage cap marked F for FAN and HERM for compressor and will have two "MFD" ratings and be either rated @ 370 or 440 volts A.C.

Sep 23, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

I need a replacement capasitor for Nordyne

The capacitor should have a MFD rating and a VAC rating stamped on it. That is all you need. Example 35+5 mfd. 370 volts. A 440 volt will work on all of them. The other 2 numbers must be the same.

Sep 10, 2009 | Heating & Cooling

1 Answer

Need to replace capacitor for comfortmaker model nac036akc3. the question is about the microfarrods and voltage of that dual capacitor

the mfd and volts should be printed on the outside of the capacitor the higher rating mfd is for the compressor and the lower for the fan
if there is no number on it there should be a mfd rating on the motor and compressor if i had to guess i would say for a 3ton system maybe a 35/5mfd 440v
if you are having that much trouble finding those numbers i would call a wholesale house for that unit and ask make sure you have your serial number too
hope this will help

Jul 29, 2009 | Heating & Cooling

1 Answer


Sounds like someone has replaced the origional split cap (fan,herm,common..not compressor) with two seperate units. The voltage doesnt really matter its the MFD rating that will need to be the same. The larger #mfd capacitor will be the compressor's and the smaller the fan motors' capacitor. Since it does have two seperate caps than the liklihood that they are your problem is slim i would look elsewhere.

Jan 19, 2008 | Heating & Cooling

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