How To Connect Capacitor To Ac Compressor

4 min read Jun 26, 2024
How To Connect Capacitor To Ac Compressor

How to Connect a Capacitor to an AC Compressor


An AC compressor is a crucial component in air conditioning and refrigeration systems. It works by compressing the refrigerant and pumping it throughout the system to cool the air. One essential component that helps the AC compressor work efficiently is the capacitor. In this article, we will guide you on how to connect a capacitor to an AC compressor safely and correctly.

What is a Capacitor?

A capacitor is an electrical component that stores energy in the form of an electric field. In the context of an AC compressor, the capacitor helps to:

  • Start the compressor motor: The capacitor provides the necessary boost to start the compressor motor.
  • Run the compressor motor efficiently: The capacitor helps to improve the power factor of the motor, reducing energy losses and increasing efficiency.

Step-by-Step Guide to Connecting a Capacitor to an AC Compressor


Before starting, make sure to:

  • Turn off the power: Ensure the AC compressor is turned off and the power supply is disconnected.
  • Wear protective gear: Wear insulated gloves, safety glasses, and a face mask to prevent electrical shock and injury.

Identify the Capacitor Terminals

  • Identify the capacitor terminals: Look for the terminals marked "+" (positive) and "-" (negative) on the capacitor.
  • Identify the compressor terminals: Check the compressor manual or the terminal block on the compressor for the corresponding terminals.

Connect the Capacitor

  • Connect the positive terminal: Connect the positive terminal of the capacitor to the "C" or "Compressor" terminal on the compressor.
  • Connect the negative terminal: Connect the negative terminal of the capacitor to the "F" or "Fan" terminal on the compressor.

Important: Ensure the capacitor is connected to the correct terminals to avoid damage to the compressor or capacitor.

Secure the Connections

  • Use the correct wire size: Use a wire size that matches the compressor's specifications.
  • Tighten the connections: Secure the connections by tightening the terminal screws or nuts.

Check the Connections

  • Double-check the connections: Verify that the capacitor is connected correctly and the connections are secure.
  • Check the capacitor voltage rating: Ensure the capacitor voltage rating matches the compressor's voltage requirement.


Connecting a capacitor to an AC compressor is a straightforward process if done correctly. Remember to turn off the power, wear protective gear, and follow the manufacturer's instructions. A properly connected capacitor ensures the AC compressor works efficiently and effectively, providing optimal cooling performance.