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Failed AC capacitor

I have a home ducted system, totally unbranded and one of the three AC capacitors connected to the starter input to the compressor failed - ie: much somke, case cracked and contents spewed out like a volcano.

Obviously the capacitor will require replacing, but is it likely that the capacitor failed due to some other problem, say in the compressor or the soft start circuit ?

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If the capacitor you are talking about is part of the start circuit, a failed current sensing relay could have caused the capacitor to remain in the circuit on start up. whenever i replace a start capacitor, I also replace the relay just in case.

Posted on Jan 27, 2009

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2 Answers

Where. Is the capacitors


the capacitors are connected to the electric motors and compressor
they will be small units in the room unit and large unit on the outside unit

Oct 14, 2015 | Air Conditioners

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How do I reconnect the capacitor?


Not easy to explain. The capacitor is split, it has two values, or like two capacitors connected internally with a center tap between them. Two capacitance values, maybe 5uf and 20uf, the lower value for the fan motor and the higher for the compressor, with terminals C-common, F-fan, M-compressor.
Capacitor terminal C is the center tap and that takes 3 connections, line (power) - fan line common to capacitor, and Compressor line common to capacitor. Notice the fan and compressor have a power line not common to capacitor, just power line.
Capacitor terminal F has one wire connecting to Fan terminal C, fan may have three or four terminal writes, two for power with one power being common to capacitor connection and the other power alone, two power connection wire leads. Fan motor third line is capacitor, connects to the capacitor alone. Four wire configuration fan motor is not likely your needs. Omit or ask again for further explanation.
Compressor is similar to fan, only with a capacitance value higher than for tha fan motor. Two power leads, one straight power, the other power lead connects to the capacitor power. The third compressor lead connects alone to the capacitor.
The with is to draw a diagram and level the colors of each lead and terminal lavels too. The motors nameplate may indicate wire color code, the a-c nameplate wiring diagram may be present in the control wron wiring compartment, the goal is to find clues or to trace each wire and verify what they connect or do, take notes on your drawing.
Basically the motor has three terminals, L1 - L2 - C, or C- S-R (Common, Start,Run)

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Air compressor on Heil air conditioner is humming but not kicking in


Capacitor Failure Symptoms are sometime harder to identify without the right tools and expertise. Capacitors can be found in several different sizes and shapes. There may be one or multiple capacitors included in your ac with regards to the design. While the most popular capacitors are the types found on circuit boards, the ones most associated with air conditioning will be the bigger capacitors that assist start and run your motors. There are several motors present in an conditioner and heater systems:
  1. Compressor Motor Run Capacitor: Here is the most popular capacitor that fails. Most of the time these are duel capacitors, which means that there are 2 capacitors built into one. A duel capacitor will have three terminals on the top where a single capacitor will simply have two terminals on top.
  2. Outside Fan Motor Run Capacitor: That is the smaller capacitor found with or part of the Compressor Motor Capacitor. It helps start and run the outside fan that blows air through the outside coils.
  3. Indoor Blower Motor Run Capacitor: Similar to the outdoor fan motor capacitor, it is a small, single (two terminals) capacitor that will help start and run the indoor blower motor.
  4. Start Capacitor: Some models include an auxiliary start capacitor that helps jump start the motors. Most are found on the compressor. These are less common.

You may need to get that checked out.
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1 Answer

Looking far data sheet or equivalent circuit/connection diagram for a 97F9834 capacitor


You can find a datasheet located here. Page 14 contains your capacitor's information. As for a connection diagram, it's fairly simple. The dual capacitor (three prong) has a connection for fan, compressor, and common. Common (typically white) goes in the middle, compressor goes to herm, fan goes to fan. You should see the labels etched into the metal either on the side, top, or bottom. As for the colors of the fan and compressor, the brown wire should be for the fan, and the compressor's wire should be yellow. Of course, your system should contain a wiring diagram, which is usually attached to the door. Consult this diagram before assuming any wire colors I tell you are correct. Also, you should have some form of cutoff switch. Ensure this switch is OFF before doing ANY electrical work on your system. 220v in AC units WILL KILL YOU, especially coming off the capacitor. Best of luck!

Tj

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1 Answer

Hello I have a 26 BTU LG split unit AC the capacitor in the compressor unit need to be replaced but I don't know how is the wiring connection the capacitor has three heads remarked as...


Hi, The Capactor that you are talking about is a dual capactor. It works the fan and the hermitic compressor in one. The leg common is power into the capictor, The fan leg goes to the outdoor fan, the herm leg goes to the compressor. Good advice is when you change the capacitor you should also change any other start componants that are also there. I hope this helps.

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Check to see if it has some wires for reversing the direction. Some have four wires you can switch around to change the direction. If not make sure the capacitor is connected to the start connection and not the run connection. The wires for reversing the direction should be orange and yellow or purple and yellow and will be shorter than the rest. Hope this helps. Let me know what you find.

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Electrolux split AC 1.5 ton inside fan working.But out side compressor fan stops after two or three rotations.


The 2 most common issues are a freon leak or the outside unit fan start capacitor goes out. It's more likely a capacitor issue. They fail regularly, especially when it's hot out. I had a fan capacitor go out on one of my 3 units last year and it cost close to $300 for an AC company to come out and fix it. I watched them fix it and it's something that you can do yourself if you know what you're doing and are careful to hook it up right. I have three AC units and another capacitor went out this year and I found a kit with detailed instructions with pictures and phone support at hvacrepairkits.com. It saved me over $200 on the capacitor replacement.

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Please help our ac compressor wont come on


Hi, did you change, capacitor for compressor too. check compressor overload switch,(relay) normally located on compressor terminals, (where you connect wires to compressor) that's the device that goes klix when compressor goes to start, could be faulty, or maybe low voltage from your mains(house panel) check line voltage, with digital volt meter, some compressor won't start if voltage drops to low, yes fan will work, could also be, your compressor has a lock rotor, (hard start), you can buy a compressor hard start kit, from appliance store, and try to start compressor, or maybe compressor internal winding, are damage, especially now in summer, when you got a lots of voltage drops, check compressor winding, check compressor winding for short circuit, remove cover on compressor, remove 3 wires from compressor terminal, use ohm meter, put one tester lead on copper tubing that's connected to compressor, and next lead to compressor terminal, one by one, if you get beep (continuity) from anyone of those compressor terminal, you got a short- circuit in compressor, you will have to replace compressor, but if there's no short, them try hard- start kit, replace overload relay, you will see it at compressor terminal location, after you remove cover. good luck.

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1 Answer

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1 Answer

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