AC Dual Capacitor Wiring Diagram

AC Dual Capacitor Wiring Diagram

AC dual capacitor is a common component found in air conditioning units. It is responsible for starting and running the motor of the AC. The capacitor stores electrical energy which is used to start the motor and keep it running. In this article, we will discuss the wiring diagram for an AC dual capacitor in detail.

What is an AC Dual Capacitor?

An AC dual capacitor is a capacitor that has two capacitors built into one unit. One capacitor is used for the fan motor, while the other is used for the compressor motor. The dual capacitor is designed to provide both the start and run functions for both motors.

The dual capacitor is rated in microfarads (uf). The rating of each capacitor is stamped on the side of the unit. For example, a dual capacitor with a rating of 35/5 uf means that one capacitor is rated at 35 uf and the other is rated at 5 uf.

Wiring Diagram for AC Dual Capacitor

The wiring for an AC dual capacitor is fairly simple. There are three wires coming out of the capacitor – one common, and one for each capacitor. The common wire is always connected to the fan motor, while the other two wires are connected to the compressor motor and the fan motor.

The diagram below shows the wiring for a typical AC dual capacitor:

Terminal Color Function
C Blue Common
F Black Fan
Herm Red Compressor

The common wire (blue) is connected to the “C” terminal on the capacitor. The fan wire (black) is connected to the “F” terminal, and the compressor wire (red) is connected to the “Herm” terminal.

It is important to note that the wiring for an AC dual capacitor may vary depending on the manufacturer of the unit. Always refer to the wiring diagram provided by the manufacturer for your specific unit.

FAQ

What happens if an AC dual capacitor fails?

If an AC dual capacitor fails, the motor it serves will not start or run. The symptoms of a failed capacitor include the AC unit not turning on, the fan not spinning, or the unit making a humming noise but not starting up.

Can I replace an AC dual capacitor myself?

Replacing an AC dual capacitor is a job that can be done by a DIY enthusiast with some electrical knowledge. However, if you are not comfortable working with electricity or are unsure of what you are doing, it is best to hire a professional HVAC technician to replace the capacitor for you.

How often should I replace my AC dual capacitor?

An AC dual capacitor can last anywhere from 5 to 15 years, depending on usage and environmental factors. It is recommended to have your AC unit inspected by a professional HVAC technician every year to check for any signs of wear or damage to the capacitor. If the technician recommends replacing the capacitor, it is best to do so to avoid any potential problems in the future.

Can a faulty capacitor cause my AC unit to freeze up?

Yes, a faulty capacitor can cause an AC unit to freeze up. If the compressor motor is not functioning properly due to a faulty capacitor, it can cause the refrigerant in the unit to freeze, leading to a frozen AC unit. If you suspect that your capacitor is faulty, it is best to have it inspected by a professional HVAC technician.