A hard start kit, also known as a compressor start kit or a hard start capacitor, is an electrical device used in HVAC (Heating, Ventilation, and Air Conditioning) systems to assist the starting process of the compressor. The compressor is the heart of an HVAC system and is responsible for circulating refrigerant and maintaining the desired temperature.
When an HVAC system is powered on, the compressor requires a significant amount of electrical energy to start and overcome the initial resistance. This is especially true in situations where the system may have low voltage or voltage fluctuations, or when the compressor is older or experiencing difficulty starting.
A hard start kit helps the compressor overcome these challenges by providing an additional boost of power during startup. It typically consists of a start capacitor and a potential relay. The start capacitor temporarily stores and releases electrical energy, providing an extra burst of power to the compressor motor during startup. The potential relay assists in switching the start capacitor into the circuit and then removing it once the compressor reaches a certain speed.
By providing this extra power, the hard start kit reduces the strain on the electrical system and helps the compressor start more smoothly and efficiently. It can improve the system’s reliability, reduce the risk of damage to the compressor, and extend its lifespan.
Hard start kits are often recommended for HVAC systems in areas with frequent voltage fluctuations, in systems using generators or extension cords, or in situations where the compressor is experiencing difficulty starting. However, it’s important to consult with a qualified HVAC technician to determine if a hard start kit is suitable for your specific system and circumstances.