Help. The Start Capacitor gives a fan motor the torque it needs to start spinning then stops; while the Run capacitor stays on giving the motor extra torque when needed. Plug the positive and negative gator probes in your multimeter and check the reading. The condensing fan motor should have the UF listed on its name plate. The capacitor and contactor work together in your air conditioner or heat pump to help power the fan and compressor. The owner of this website, hvachowto.com, is a participant in the Amazon Services LLC Associates Program, Amazon.com.ca, Inc, Amazon EU Associates Programme an affiliate advertising program designed to provide a means for sites to earn commission income (advertising fees) by advertising and linking hvachowto.com to Amazon properties including, but not limited to, Amazon.com, Amazon.ca, Amazon.co.uk, Amazon.de, Amazon.se, Amazon EU Associates Programme, Amazon.it, Amazon.es, Amazon.fr endless.com, myhabit.com, smallparts.com, or amazonwireless.com Amazon.ca, Amazon.co.uk and other sites worldwide. The fan motor will still not start on its own ( i have also replaced the fan with similar to original). Rust on the blades is bad and should be cleaned off gently with a brush. The Dual Round Capacitors are simply the way engineers are trying to save on space and cost. I have 3 of the exact same units. Should I connect that jumper wire to (F)an or (C)ommon on the dual capacitor? I wired it same as before. Electrical motor capacitors have two terminals, so make sure that you identify the positive and negative one before we begin. I can goto Google and get most ANY schematics for Air nits. 2 yellow wires, together on old and a red wire on another port. It delivers power to the motor driving the air conditioning system. I have a number from the inside panel where the wiring is located and I have some numbers off the motor below the fan (compressor)? Depending on the unit one or two wires should go to the fan motor. Capacitors are no joke and can kill anybody instantly if not properly discharged or handled. Air conditioner capacitors can be as large as refrigerator capacitors, or even bigger! Start studying Heat Pump Prep Test. Good luck. Killed the power and waited a few minutes. I had an AC guy fix my unit about 5 years ago and it turns out I needed the fan motor and capacitor replaced. I’ve found one with the exact same specs (30/7.5 MFD, 440V, size) on Amazon. Our AC stopped working yesterday and after a few calls we got someone to after 5. If I were you I would just purchase a new capacitor with the same ratings More than likely this will solve your problem. The service call was $110 for after hrs., I’m fine with that, but the tech told us we need a new unit that our compressor was shot. In my case unit is 13 years old and contactor switch points were charred. The heat pump technology has made advancements and aims to improve how to heat or cool the battery and the cabin in a cost-effective and battery-effective manner. Does it matter where you connect the brown and brown with white stripe wires on the smaller oval capacitor? I always hear people calling it a dual run capacitor, that is where the confusion comes in. If a unit is at least several years old replacing contactor switch is also recommended. A basic A/C unit should be wired as follows. Then purple wire from fan goes to other side of capacitor? What’s important is that the capacitor is fully discharged before you begin the test. Find the side panel where the electric is fed into the unit and remove the panel. I prefer using alligator probes to discharge this type of capacitor. I’m going to sound like an idiot here, I’m aware when you replace anything you go by the previous specs to replace it with, but I was kind of thrown a random “test” so to speak where I had to match the right capacitor to the right motor, how exactly would you go about doing that? he wanted to charge you for the parts and labor. He called into his office for something and came back to tell me that he would not be able to do a single thing more without my authorization because it turned out I only had a 5 year warranty and not a 10 year as I thought I had so I’d actually have to pay for the capacitor replacement… At $300 labor. Other option is to trace the wires. But — When the condenser unit was first turned on the fan ran clockwise – in the right direction. Is it alright for this replacement? The OG also said that the amps the compressor was pulling 12 something should be 7 something. Here is a Single Capacitor I’m thinking perhaps the cost difference is just due to supply/demand, and not some other factor. Also, each terminal serves a specific function, i.e. After replacing a bad Condensing Fan Motor a new Start Run Capacitor should always be installed. Before we begin, you should know that testing capacitors with a multimeter in a circuit can be dangerous and should be done by a professional. A dual capacitor will most often have one side to start the compressor (Herm) and the other side to start the condensing fan motor. If it’s not the capacitor, it’s likely a bad phase winding and the motor needs to be replaced. Old capacitors should be replaced with a new motor or at least tested but if the fan is working than there is another problem. The Difference Between a Heat Pump and Air Conditioner. As you do this, you should see an increase in the value that is displayed on your multimeter. I am replacing the existing 4 wire condenser fan ( purple, purple, black, orange) with a new 3 wire (purple, orange, and black) condenser fan. Energy is stored in capacitors in the form of electric charges. After all these settings and placements, you can now check the readings on your multimeter. Take your multimeter and set it to capacitance. I replaced and the 5 ton central ac is cooling great again, but the system is turning off and on every 2-3 minutes. Set your multimeter on the low impedance function and take the probes. Required fields are marked *. A Dual Capacitor has three connections HERM, FAN, and COM. Most of the capacitors I’ve looked at are $5 to $15 dollars, so a little less than Home Depot and Lowes. I thought I copied the way the old one was wired, but now I’m wondering if I did something wrong. 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