A Dual Run Capacitor is an essential component of an HVAC system and plays a critical role in ensuring that the system runs smoothly and efficiently. This capacitor has, in total two electric motors (fan and compressor) and three distinct connections (HERM, FAN, COM).

1. HERM (3 tines)
The connection is integral to the HVAC system as it connects directly to the compressor motor. The compressor is responsible for compressing and pressuring the refrigerant, allowing it to absorb heat from the indoor air. The HERM connection provides the electrical power to the compressor motor and is typically connected to the motor’s start winding.
2. FAN (2 tines)
The connection has been securely attached to the fan motor, ensuring that it’s working optimally. The fan is responsible for circulating the indoor air and is typically connected to the run winding of the motor. The FAN connection is extremely essential as it supplies the fan motor with electricity. It normally connects to the run winding of a motor, thus providing it with power.
3. COMMON (4 tines)
The connection is connected to a common point in the electrical circuit. This connection acts as a point of reference for the current running through the capacitor, making it possible to transfer electricity. It is important to ensure that the connections are made correctly, otherwise, the HVAC system may not function properly.

When selecting a Dual Run Capacitor for an HVAC system, there are a few key specifications that should be considered:

• Capacitance: The capacitance of a Dual Run Capacitor is measured in microfarads (µF) and is the amount of electrical energy the capacitor can store. Ensure that the Dual Run Capacitor is as specified for your HVAC system’s compressor and fan motors – essential for optimal performance.
• Voltage: A Dual Run Capacitor’s maximum amount of electrical energy is calculated in Volts, which needs to match the voltage of the HVAC system’s power supply.
• Frequency: The number of cycles per second frequency rating of the Dual Run Capacitor is measured in hertz (Hz) and must match the frequency rating of the HVAC system’s power supply frequency.
• Oval/Round Case Style: Dual Run Capacitor comes in two different shapes, oval and round. The case style of the Dual Run Capacitor should match the space available in the HVAC system and the mounting location.
• Terminal Type: Dual Run Capacitor terminals are incredibly versatile and suitable for various industrial and commercial applications, including screw, push-on and many more. The terminal type of the Dual Run Capacitor should match the type of terminals of the HVAC system’s motor and wiring.
  

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