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I have to replace the start/run capacitor (97F9971 - Duel Capacitor/ 50, 7.5 370 VAC). I have marked the terminals before removing and purchased the new capacitor. The new capacitor has minor difference with the old one. The hermatic has 3 terminals, The Fan has two terminals The Compressor (C) has 4 terminals. Now in the old unit, two wires were connected to two opposite terminals on C, one in Herm and one in Fan. My question is: How will I know which terminal to connect in the new one as all terminals (Ex 3 in case of herm) looks similar?

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All the terminals are connected together so it won't matter which terminal you use, just as long as you have the Herm, Com, and Fan wires correct. Hope this helps!

Posted on Sep 28, 2010

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I have a S24AWN-U56 condenser fan doesn't start once pushed with a screwdriver fan runs , is there s start capacitor for the fan?


There is no start capacitor, but there is a RUN capacitor. More than likely it will be a 'combination' run capacitor that shares the common terminal of a dual capacitor with a higher mfd side for the compressor. Typically a 35/5 or 40/5 rating is what you'll see on the side of the capacitor. It will be grey in color, possibly round or oval and near the size of a soda can.

What you are describing is a motor trying to start without the aid of its run capacitor, which momentarily allows a bit more amperage flow through the start winding than it does once the motor starts. This is what 'charges' the run capacitor, so turn off the power, note the position and terminals the wires are on, remove them with insulated pliers and short across ALL terminals to drain the potential charge before touching the spade clips with your bare fingers. Remove the capacitor and read the rating on the side for replacement. Contact just about any local HVAC company for a replacement or go to WWGrainger's website and see if you can buy one retail from them.

The three terminals will be marked 'C' for common, 'Herm' for compressor and 'F' or 'Fan' for the condensor fan. If you get any wire in the wrong place, you could potentially damage the compressor or the fan motor.

BE SURE TO DO THE WORK WITH THE POWER OFF !!!!!!!

Jan 03, 2015 | Heating & Cooling

Tip

How to replace a run capacitor


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A Run capacitor has 2 terminals, they go to the Run and Start winding terminals, in this case the Line 2 leg of power is wired to the Run terminal on the run capacitor, that is due to the fact this is a single speed motor and speeds are on the Run winding, had there been 2 speeds, the Line 2 leg of power could not be wired to the Run capacitor but would be going to the High or Low speed terminals, conversely the Run terminal on the compressor can accept only 1 lead.
All electric motors get 1 leg of power directly to the Common lead, the remaining leg of power Always goes to the Run winding or speeds on the run winding if a multispeed motor.
Some compressors have a shared capacitor with 3 terminals, they share the leg of power to their Run windings however to Hermetic it will be say 30 MFD and to Fan it will be say 5 MFD, but as to capacitor theory they get Run and Start Always
Power can be wired to Run on the capacitor as long as the motor is a single speed.
But power ALWAYS goes to Common directly while the remaining leg of power goes to the Run winding or Speeds on the Run winding as in High and Low speeds.

on Oct 14, 2013 | GE 1 Pcs. Of 50uf 370v Ac Motor Run...

Tip

Wiring up a compressor + start kit



Wiring up a compressor
If there is an identifying mark on one side of the capacitor such as a Dash, Red paint or arrow pointing one direction that will be the run side of the capacitor, if no marks you can use either side for start or run.
If you have three terminals on the capacitor you have a dual capacitor, (C = RUN compressor and fan) (HERM = compressor start) and (FAN is fan start wire).
The Start wire goes to one side of the run capacitor it will be the only wire on that side of the capacitor.
The Run wire goes to the terminal side (T2) of the contactor, it will have another
wire from that terminal to the run capacitor which is the opposite side of the start wire.
The Common wire will go to the other side of the contactor (T1).
Start Kit
Start from the capacitor to terminal #1 on start relay There should be another wire from
here to start on the compressor.
Common from contactor (T1) to terminal #5 on start relay. There should be a wire from this terminal to the Common terminal on the compressor.(there will not be a capacitor in this circuit)
Run from the other side of the contactor (T2) to the start capacitor and from the other
Side of the start capacitor to terminal #2 on the start relay. There should also be a wire from this
Terminal to Run on the compressor.

on Jan 24, 2010 | Heating & Cooling

1 Answer

Indoor fan barely turning


the three post capacitor has c for line voltage in, the f or fan is for the outdoor motor,and com or comp goes to start winding compressor.youll have to follow wires from indoor motor to find capacitor. to find wires to outdoor motor to capacitor you have line voltage and capacitor wires .look for schematic it would help or send colors of wires from both motors and compressor common,start .run.

Jun 07, 2013 | GE Zoneline AZ55H07D Air Conditioner

1 Answer

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.
Air Conditioning

Oct 16, 2012 | 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

2 Answers

Don't know how to connect capacitor


Locate the Run terminal on the compressor ( marked R ) that wire goes to one side of the run capacitor usually has a mark ... the other wire will go to the common bar on the selector switch. On the other side of the capacitor goes the Start Terminal of the compressor No other wire goes with that just one wire from ( S ) on compressor to capacitor. Hope this keeps you cool!


Jul 18, 2011 | Heating & Cooling

2 Answers

My condensor fan hums but it will run if i give it a little turn. The motor is free but seems hot after running for 5min. The compressor it warm but lines out are not hot or cold for evap side and coil,


Start by shutting the unit off, before any more damage is done. Locate the run capacitor for the fan. It is a silver colored can, typically with two wires coming off the terminals. (sometimes 3). Mark and record the wire locations. The capacitor will have a part number and will be marked either 370VAC or 440 VAC and will have a rating in microfarads.

Bring the capacitor to an electrical or HVAC supply house and get an exact replacement. Install the new capacitor, close the unit up and re-power. If you are lucky, the fan will run, as normal. If not, you'll have to replace the fan motor. Capacitors are cheap, so, in my opinion, it is worth a try.

Jul 20, 2010 | Goodman CKL30AR30 Air Conditioner

1 Answer

How do I wire a new condensor fan motor to the new capacitor? The old capacitor is longer and it has 3 terminals. the new capacitor is much smaller and oval. It has 2 terminals. the fan motor has 3 wires,...


Before attempting any of these recommendations, First disconnect all the power sources and check your wiring diagrams on the motor and condensing unit.
On the old capacitor if you look on the top near each of the three terminals. Are they marked, fan - C - herm? If they are that is a dual capacitor and that needs to stay because that is also your compressor capacitor.
The Red wire from the conductor is Run and it's connected to C on the old capacitor.
Follow the Yellow wire and see if it goes to the S or start terminal on the compressor, if it does then that is the Start wire for your compressor and it connects to herm on the capacitor.
For the fan motor a lot of times the wiring connections are printed on the motor label.
Check the label, Purple should be run and connect to C on the old capacitor.
Black should be Common and it connects to the opposite side of the contactor as the Red wire. If the Red wire connects to T1 then the Black wire connects to T2.
The Brown wire shoud be the start wire on the fan motor and it connects to the Fan terminal on the old capacitor.
Now if you want to use the new fan capacitor. Take the Purple wire from the motor and look for any marks (red paint or a dash) on or beside the terminals on the new capacitor. If there is an identifying mark then connect the Purple wire to that terminal, if no marks you can connect it to either terminal. Then you need a jumper wire from C on the old capacitor to the purple side of the new capacitor. Then take the brown wire and connect it to opposite terminal of the new capacitor.

Apr 05, 2010 | Heating & Cooling

3 Answers

Fan not turning, but motor is humming


might want to check the fan motor start capacitor

Jun 09, 2008 | Hampton Bay HBLG5004 Air Conditioner

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