Home House A/C repair 3/ 3: WHY & HOW to Install AC Hard Start Capacitor or 5-2-1 Compressor Saver

This video is a part 3 of 3 for A/C repair...see the other videos below:

1) A/C unit blown capacitor replacement
   • Home House A/C repair 1 of 3 videos: ...  
2) Air handler unit blown capacitor replacement
   • Home House A/C repair 2 of 3 videos: ...  
3) Installing a 5-2-1 compressor saver -- This video
   • Home House A/C repair 3/ 3: WHY & HOW...  

Typically, these hard start capacitors get installed on units are having a hard time starting up, the compressor is getting weak, but to help prolong their lives because they are functioning fine, these capacitors are added.

They operate by increase the phase angle between the start and run winding. This provides an extra boost to the compressor to start up. Thus reducing the load on the compressor at startup.

Since these units get installed on compressor near the end of their lives, I assume that they would be beneficial earlier on as a preventative measure.

Make sure to get the correct hard start capacitor for you unit based on how many TONs the unit it...I would suggest the 5-2-1 brand only. There are other cheaper ones, and I wouldn't trust them.

This video shows how one of these units can be installed yourself.

I would stick with the 5-2-1 Brand....not sure about the reliability of the other brands:

‎CSR-U1 by Five Two One Inc
https://amzn.to/3jexUQb

CSR-U2 by Five Two One Inc
https://amzn.to/3C04DBk

Safety: ALWAYS safety is first. Pull the fuse to the A/C. Be careful around live wires. If you are still scared, then have a professional do it.

Reference: kwm380 has a great video in explaining how these things work. I found his video to be the most useful to me in learning how they work.    • Hvac hard start kits, how they work  

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