Is the 5-2-1 Compressor Saver® approved by equipment manufacturers?

Yes. The 5-2-1 Method has been in existence for over 70 years and is used by all major equipment manufacturers.

Is there a warranty?

Yes. 5-2-1 Inc. provides a three years warranty on parts. Labor is not covered.

What’s difference between the 5-2-1 Compressor Saver® and other 2-wire hard start devices?

There are two main differences. With the third wire the potential relay on the 5-2-1 can read true back-emf. This means the device can accurately determine when it should go out of circuit. Other products with two wires are either operating on a timer and are not equipped to read true back-emf, which means that they be in circuit too long or not long enough. Secondly, the third wire isolates the start capacitor so that in the event of a potential relay failure you will only damage the start capacitor on the 5-2-1. With two wire devices, in the event of failure you have the potential to damage the actual

Is this new technology?

The 5-2-1 Compressor Saver® uses electrical principles that have been in practice for the past 70 years in the industry. 5-2-1 has made advances on the underlying components over time and has prepackaged the components in an easy to install package

Why are there three models?

The 5-2-1 Compressor Saver® comes in three different packages – CSR U1, CSR U2 and CSR U3. The difference is in the size of start capacitor. Smaller capacitors are needed with the smaller units and naturally larger capacitors are needed with the larger units.

Is the 5-2-1 Compressor Saver® UL listed?

Yes.