Question about Ruud UAKA042 Air Conditioner

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Dual Capacitor? I believe my dual capacitor for the outside condenser is not working properly, but I have no idea what the uF for the cap should be? I'm looking at the actual cap but there are no markings indicating what the capacity of the replacement I should buy. If anyone has the specs on the replacement cap to buy, I would surely appreciate it. eddie

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Pull the quick disconnect. Mark which way the capacitor went in and draw a diagram or mark the wires before removing them. It should say somewhere on it what the UF is on both sides. A A/C parts store can usually test them. Most of the time they are swelled up or leaking if they are bad. There is a little spot where they blow oil out of to keep them from exploding. The wireing diagram may tell you what size it is. It will probably be inside the pannel that covers the incoming wire. check here for a dealer near you if needed. Good luck and be careful.

Posted on Aug 01, 2007


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1 Answer

2 capacitors are in the condenser unit. 1 ceramic, 189-227 mfd. would that be for the compressor? the other is aluminum, 35+5 uf. would that be for the fan?

the 189-227 is a start capacitor for compressor. the dual capacitor is 5 uf for fan and 35 uf for compressor it serves as run capacitors.

Sep 14, 2015 | Heating & Cooling

1 Answer

I have an arcoaire condenser. dual cap.

Yes, Red to Com, Compressor to Herm, Brown to Fan. You should also have another wire from the condenser fan going to the Com terminal.

Jun 10, 2012 | Heating & Cooling

1 Answer

Uaka 024JAZ condensing unit comes on, fan and compressor start up, fan remains on, compressor shuts off in appx 1 min , pressures appear to be headed to normal op range. I did not see a run cap for this...

This unit uses a dual run capacitor. There is no start capacitor involved.

The dual run capacitor is possible weak, also check all the electrical connections for tight fitting connections with can cause motor/compressor overheating.
To test a capacitor properly you need the proper test meter capable of reading uf readings(within 6% of the stated rating on the capacitor) "C" common to "F" fan and "C" to "Herm" terminal, the higher rating for compressor and the lower for the outdoor fan. [(example= 25/3uf 370v) 25uf=compressor, 3uf=fan motor.]

Oct 01, 2011 | Ruud UBHC Air Conditioner

1 Answer

I installed a new fan motor condenser in my air unit outside and I bought a new capacitor but it looks different than my old one in that my old one has three points of connection and the new one just two....

Look at the microfarad rating on the old capacitor and the new capacitor. Many are dual capacitors in one housing. The lower rating on your old capacitor is for the outdoor fan motor and the higher is for your compressor. It sounds to me like you have been sold a single capacitor when your unit had a dual capacitor originally.

Aug 03, 2011 | Heating & Cooling

1 Answer

I have an 12QZ22TA model. It's blowing warm air. How do you put in freon?

Only an EPA certified Technician can add refrigerant. There are other possibilities why it is blowing cold air.
1. Thermostat is bad (disconnect the power, remove the thermostat, place a jumper wire on the two terminals) Unit starts to cool bad thermostat.

2. Capacitor is bad (look for oil or swelling) looks like a can with terminals.

You can test with a meter.
Instructions Things You'll Need
  • Standard multimeter
  • A/C compressor capacitor
    • 1 Turn the A/C unit off along, and unplug it from, the wall to prevent any power surge to the unit when handling the internal devices. Locate the capacitor inside the unit. Capacitors will come in varying shapes; some will look like either a round or oval cylinder with two or three power terminals on the top. Air conditioners can have two capacitors -- one for the condenser fan and one for the compressor -- and are called dual-run or dual-rated capacitors.
    • 2 Place the probes on the terminals for a run capacitor with two terminals. If the capacitor is a dual-run capacitor with three probes, connect one probe to the herm terminal and the other to the common terminal. You can check the capacitance of the fan for a dual-run capacitor by connecting the probes to the fan and common terminal.
    • 3 Turn on the multimeter and read the display screen. You will see two readings, one for the condenser fan and the other for the compressor. Readings will be in micro farads and seen as the letters "mfd" or "uf."
    • 4 Replace a capacitor if the reading is below manufacturer standards. You can find the required micro farad for the capacitor either marked on the device or in the air conditioner's installation manual. Refrain from testing any capacitor if it is leaking, has corroded terminals or the capacitor unit bulges. Replace it immediately.


Aug 01, 2011 | Amana Quiet Zone 12M12TA Air Conditioner

1 Answer

My carrier 38ckc036350 is 6 years old. Today the compressor stopped working. The fan outside comes on and every few min i hear an electrical buzz like the compressor is trying to be energized. Are there...


It sounds like the capacitor and/or compressor are quitting. Try getting a Start Capacitor of the same uF (I think 35 uF for Commpressor and 5 uF for fan motor) as the one you have, OR get a Start Kit from any AC parts shop for about $10 and hook it up in line with the old capacitor, if you have a two terminal capacitor plug the terminals one, on each end, if you have a 3 terminal called DUAL Capacitor, each terminal is stamped with the words FAN, HERM and the letter C for common, one lead goes in the C terminal and the other one goes on the HERM.

Install it and turn unit ON. Good Luck!! Don't forget to rate this post!!

Aug 20, 2010 | Carrier 38CKC036 Air Conditioner

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

2 Answers

How to wire motor to dual run capacitor

The easiest way to do it is to get a capacitor just for the fan motor (in the motor tag you can read what size cap. you need , maybe 5uf or 7.5 uf) and put the two brown wires on each side of the capacitor and the lines (probably white and black) to the contactor.

Sep 27, 2009 | Heating & Cooling

1 Answer

Air conditioner not working.Tries to come on but doesn't. Blower and heat unit works fine. Model E1EB-010HA Nordyne. You can hear humming at outside unit.

Most likely a failed run capacitor in the outdoor unit. The unit either has two separate run capacitors; one for the outdoor fan and one for the compressor. Or it may have one dual run capacitor which is the two capacitors built into one casing. Usually either a grey or silver cylinder with terminal connections on one end. If you intend to replace, make sure the power is off first by pulling the disconnect or turning off the breaker. Mark all wires and make sure they get back to the same terminal on the new capacitor. Capacitors are rated by their capacity (go figure) the new cap must match the old cap exactly on the uF or MFD (called micro-farads) rating. Voltage rating on the capacitor must be 370v or higher (most new caps are 440v rated). If you are not completely comfortable doing this yourself, a qualified HVAC service company can take care of the problem for you.

Jun 25, 2008 | Intertherm Heating & Cooling

2 Answers

Condenser fan rotation

However, if it is the ORIGINAL motor, check the dual run capacitor for proper microferrad value. It may be that it is swelled up on top and that is a direct indication it is a fouled capacitor. If the top is not pregnant or swelled, and it still looks like the top of a soda pop can, you will need a microferrad meter.
Disconnect ALL power to the condensing unit. If in doubt, kill the power to home. Remove 1 wire from the capacitor, the brown one or the one that is marked "FAN" and set your meter to Mfd, measure with your leads the value between the COMMON and FAN terminals. They should be within 6% of the rating on the capacitor. There is no rule of thumb here, you must know the correct value and see if it is equal or within the 6%. If it is under the 6%, you will need to replace the DUAL RUN CAPACITOR. No question, because it is a dual run cap, it controls the Compressor also. Best to change the whole capacitor with that of equal value.
God Bless.
ACMAN66 (Erik)

May 27, 2008 | Goodman CKL24AR24 Air Conditioner

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