Question about Ruud UAKA042 Air Conditioner

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No tag to find out the size of the condenser unit to know the rating for a dual capacitor

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  • Dennis Boxerman May 11, 2010

    If you want to replace the dual capacitor on the outside unit: 1.) Kill power to the unit.(Be sure to verify this with meter). 2.) Open the access panel to gain entry to the components. 3.) Take a screwdriver and short the terminals from "C" to "Herm" and "C" to "Fan" (This discharges the capacitor. It may or may not spark. Be careful!) 4.) Remove the wires.but be sure to mark them prior so they can go back to the right place. 5.) If the capacitor is held in with a strap, the information as to the microfarads and voltage may be under it. Or, possibly on the "Flip" side of the capacitor. 6.) Look on the inside of the access cover for any information as to the model of your unit. (It is sometimes printed on the wiring diagram.) Good luck and hope this is what you are looking for.

  • boss dad May 11, 2010

    you will need to count the number of coil tubes and the O.D. of the tubes, also will need to know the H.P. of the fan motor. do you have a model number and brand name of your furnace?

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Information is on the capacitor . mfd all so on the motor allso on the compressor has a model and serial # get that info call the local part supply house they might tell you what ya need are ya sure it is a bad capacitor. Tom

Posted on Jun 27, 2009

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Trying to determine what size capacitor my unit C1048BBD1VF uses for my AC unit. Is it larger then a 45 amp? Replace it with a 45 and you can hear it try to turn on but it won't.


capacitors are rated in microfarads or picofarads and not amps
capacitors are used to provide a boost voltage to start motors and then to keep them running
Amps is current flow so what ever you replaced was the wrong unit.
on the side of a capacitor will be voltage rating (110-115-220-240 etc and a number 45 -55 60 uf etc
it will have either 2 terminals or 4 terminals connected as pairs
from what you describe it is a capacitor problem

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What size capacitor in a Carrier Heat Pump 38yh036300


This is a three ton heatpump must likely it is a 35/5uf capacitor. But if you can read compressor tag it will tell you size it requires and also fan label will do some for it.you will need to ask for a dual capacitor from supply house make sure you pay close attention to hoe wires hook up so you can wire in new on before removing wires make sure you have high voltage turned off to unit.take pic with phone this will help when you rewire

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1 Answer

My condenser fan runs and blows cool air but isnt cooling down the house. Any help.


Check the outdoor unit (condensing unit). Keep in mind, because the condenser fan is running it's not an indication that the compressor is working. On a split system,there's a dual capacitor that serves the fan and the compressor. The capacitor has three terminals.
1. common
2. fan = fan
3. Herm = compressor
This is a common problem; The outdoor fan (condenser fan) runs, but not the compressor (you have to know the sound of a running compressor or you'll mistake it for the sound of the fan) doesn't, because the compressor side of the capacitor is too weak to give it that needed phase angle that it requires to start. If you're referring to the outdoor fan spinning, but no cooling, I can bet the compressor isn't working and needs a new capacitor. Very common problem, I see it all the time. Before you change the capacitor, make sure that you cut the power to the unit, and then use an insulated tool such as a screwdriver and short the terminals together first. A capacitor holds a charge even after being de -energized.Buy the new one with the same exact rating written on it as the old one. Do not mix up the wires when replacing. Write it down or take a picture with your phone

Aug 20, 2013 | Heating & Cooling

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.



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

1 Answer

I NEED TO KNOW WHAT SIZE CAPACITOR GOES IN MODEL NUMBER- CK49-1B


The old capacitor has it's rating on the side. If the old capacitor is missing the you will have to read the capacitor rating on the data plate for the compressor and the one for the condenser fan motor as well. Each of them will tell you what capacitor they require.The compressor will be something like 35µF.

Data plate for the compressor in located on the top of the compressor or on the side and will look similar to the one of the ones pictured below. The fan motor one will be on the side of the motor, you will have to remove the top of the condensing unit to see the fan label.

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Jun 19, 2011 | Goodman Heating & Cooling

1 Answer

The fan is working but neither heat nor AC is working. We can hear the condenser try to click on for a second or two every minute or so but does not start. Is there something we can check or clean before...


Sounds like you have a popped capacitor due to dirty condenser coil. A Dual capacitor through a company is going to run you at least $250 and the condenser coil needs to be chemically cleaned. If you get it yourself I think depending on the size around $30 - $40. Make sure to clean that condenser coil very good.
If this helps please rate me and do a testimonial.

May 23, 2011 | Samsung Heating & Cooling

1 Answer

I just bought a new compressor for my a/c but the store sold me the wrong capacitor. I need a dual capacitor but don't know how to read microferets to get the correct capacitor. Can you help me?


Do you still have the original capacitor for the unit. They probably gave you the size you need for the compressor. It should have the microfarads printed on the capacitor. The symbol resembles a strange looking u. Then look at the capacitor that came with the unit and get the microfarad rating for the fan. Now you will have the too readings you need to get a capacitor. The fan motor may also have the size capacitor you need printed on the data plate. Let me know if you need more help.

Jul 03, 2010 | Heating & Cooling

1 Answer

Ac unit fan does not turn unless i force it to turn. also not producing cold air


If the fan just hums and if you spin the fan and it runs, check out the capacitor, it is bad. Most condensing units have a split capacitor, for the hermedic unit and the fan. If the compressor runs the dual capacitor is bad on the fan side. Your choice buy the dual capacitor, or just buy a single capacitor for the fan part of it. Make sure the voltage rating and microfarad ratings are the same. They will be marked on the old capacitor, as will fan (for fan), and herm for compressor). THATS 220 VOLTAGE YOUR WORKING WITH, BE SURE THE POWER IS OFF!!

Jun 22, 2009 | Goodman Heating & Cooling

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