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5 - 2 - 1 Compressor Saver

The 5-2-1 Compressor Saver® is hard start kit that uses a powerful multi-layer starting capacitor and a smart switch to give your compressor the boost it needs to start up quickly, more reliably, draw less power and save you money, too.

The 5-2-1 Compressor Saver® is an electrical component that is attached to the condensing unit of your air conditioner. The 5-2-1 Compressor Saver® (also known in the industry as a hard start kit) consists of a potential relay and a start capacitor. A capacitor is an electrical component that can store energy. The potential relay is a switch that is turned on or off based on electrical current.

When the air conditioner starts up, the potential relay is "in circuit" or "on", meaning that the energy stored in the start capacitor is being used to help power the compressor (giving it a boost). The potential relay reads the electrical current coming from the compressor and when it reaches a certain level (when the compressor indicates that it is running), the potential relay is thrown out of circuit or turned off.

This means the start capacitor is no longer needed to assist the compressor.  The start capacitor is like an extra person on the back bumper to push a stalled truck, but that person only pushes until the truck has momentum. At which point the person stops pushing.

The primary difference between the 5-2-1 Compressor Saver® and other "hard start" or "soft start" kits is that the 5-2-1 Compressor Saver® knows exactly when the air conditioning compressor has "officially" started, so we know precisely when to get out of circuit. The 5-2-1 Compressor Saver® is not in circuit too long or not long enough, but precisely the exact amount of time. Our competitors use cheaper, alternative methods that are not as accurate and even potentially dangerous for the air conditioner.

The product gets its name from the terminals that are used when connecting the potential relay to the compressor. The "5", "2" and "1" terminals on the potential relay are used to connect the potential relay to the compressor in order to properly work. Hence the name "5-2-1".