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Compressor Saver Hard Start Capacitor Model CSR U3

4.7 out of 5 stars 69 customer reviews
| 8 answered questions

Price: $39.94 & FREE Shipping
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Ships from and sold by HVACMEGASTORE.
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  • Air conditioners with the 5-2-1 Compressor Saver typically start in 30-50% less time than air conditioners without the product.
5 new from $34.96
$39.94 & FREE Shipping In Stock. Ships from and sold by HVACMEGASTORE.

Frequently Bought Together

  • Compressor Saver Hard Start Capacitor Model CSR U3
  • +
  • Compressor Saver CSR U1 Hard Start Capacitor
  • +
  • Compressor Saver Hard Start Capacitor Model CSR U2
Total price: $113.05
Buy the selected items together

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Product Description

Starting up is the hardest time in the life of any type of electrical equipment. Ever notice that light bulbs almost always burn out when you first turn them on and not while they are on? This is due to the huge current that rushes in when a switch is thrown and power is first applied. Your air conditioner uses anywhere from 5 to 10 times more power on start-up than it does while running. With this burst of power comes a surge of heat that accompanies the electrical current. This heat damages the compressor, the terminals, the windings and run capacitor - all vital components of your air conditioner. The 5-2-1 Compressor Saver® protects these components by significantly reducing the amount of time it takes for your compressor to start - in some cases up to 50%. This means your air conditioner and compressor will bear ½ the stress, strain and heat each and every time it starts. Considering that your air conditioner may start up more than 6,000 times in a single cooling season, the positive impact that the 5-2-1 Compressor Saver® has on your air conditioner is significant. Before you replace your air conditioner, try adding a 5-2-1 Compressor Saver®. The 5-2-1 Compressor Saver® might save you from having to outlay thousands of dollars to buy a new air conditioner or compressor. At a fraction of the cost, installing the 5-2-1 Compressor Saver® is a wise investment.

Product Information

Technical Details

Part Number CSR-U3
Item Weight 1 pounds
Product Dimensions 8 x 5 x 2 inches
Item model number CSR-U3
Color Multicolored
Material Capacitor
Item Package Quantity 1
Batteries Included? No
Batteries Required? No

Additional Information

ASIN B003FNJ37U
Customer Reviews
4.7 out of 5 stars 69 customer reviews

4.7 out of 5 stars
Best Sellers Rank #9,438 in Home Improvements (See top 100)
#19 in Home Improvement > Power & Hand Tools > Power Tool Parts & Accessories > Air Tool Parts & Accessories > Air-Compressor Accessories
Shipping Weight 1 pounds (View shipping rates and policies)
Date First Available April 6, 2010

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Reviews

Top Customer Reviews

Verified Purchase
I'm sure this isn't for everyone, but I have no problem working on 220V and I respect it and adhere to safety precautions. The HVAC company we have is great, however, since we replaced our system with a $12,000 new system, every time they visit for a checkup, they keep telling us to add a "start kit." They want to charge $291 for that. Why the hell was that $50 part not included by default during the $12,000 installation, HVAC company??? Not cool AT ALL.

It took me all of 5 minutes to install this on our unit outside and I put a meter on the power wires before and after and (look at the photos) I will tell you that the amp draw is CONSIDERABLE. As in, before the installation, the unit drew upwards of 138 amps. After, it only drew 13 amps. Amazing.
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Verified Purchase
The compressor on our A/C really draws the amps (power) on start up, always has, enough so that the house lights visibly dim for a couple of seconds. When the A/C was new, it would trip the circuit breaker on start up.

We had a licensed electrician come out to inspect the wiring in our home; he told us that everything was up to code. So, after doing some research, I decided to give the 5-2-1 a try since it could reportedly reduce start up amps on the compressor by as much as 50%. Less power required on start up, less light dimming, and longer life for the compressor, at least in theory.

The installation took me about an hour. I have an electronics background and am comfortable working around electricity and know the basics of A/Cs. But the package on the product recommends that you let a licensed tech do the installation. Not a bad idea because not everyone needs to be working around 240VAC. If you don't know what you're doing, it's not worth the risk. You can do some serious damage to the A/C and/or to yourself.

Now, the house lights barely dim, and it's only for a fraction of a second. I am VERY impressed and pleased. And it should help the compressor to live a longer life. A new A/C can cost thousands $$$, so the money we spent on the 5-2-1 was well worth it.

My only complaint was that the vendor shipped it without any padding or wrapping material in the shipping carton. It was placed in a box, taped up, and shipped. Fortunately, it survived the long journey, although it most certainly took a beating.
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See My YouTube Video - http://www.youtube.com/watch?v=vIZUvZaF694

Installing a 5-2-1 Hard Start Kit Capacitor on a Tempstar (which is made by Carrier) HVAC and also Connecting the HVAC Compressor To a Briggs & Stratton 20KW Transfer Switch. A Hard Start Capacitor Corrects House Light Dimming Problem on HVAC Compressor Startup and Makes it Easier for your Generator to Start the HVAC Compressor. It also Extends the Life of your Compressor by giving it the power that it needs and prevents compressor burnout from verheating on startup. 5-2-1 Kit is the only one that really works. Unlike two wire units, It has Three wires so that it can sense Voltage coming back from the Compressor spinning so that the Relay on the 5-2-1 can shut off the extra power immediately when your Compressor starts up, and not burn it out. I paid about $45 on ebay from seller "akumar108"

Instructions:
Turn off the electricity to the unit by turning off the unit's circuit breaker if the unit wires directly to the circuit breaker. Then Short Out the Herm and Common Terminals on the Run Capacitor so that you do not get a Shock. Then Read the Markings on the Start capacitor's wiring diagram as well as The Run Capacitor that is on the AC Unit.

Then push the wire terminal on the start capacitor relay's "Common" wire, usually the black wire, to the common terminal on the load side of the unit's contactor. The wires connected to the motor's common terminal, marked "C" or "COM" on the motor's wiring chart, also connect to this contactor terminal.

Push the wire terminal on the start-capacitor relay's "Run" wire onto the run capacitor's "HERM" terminal. The wire connected to the motor's start terminal, marked "S" on the motor's wiring chart, also connects to this run capacitor terminal.
Read more ›
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Verified Purchase
Preassembled unit, easy to follow instructions, if you are technically oriented. I would not recommend this for the non-handyman due to the 220 voltages involved.

Price of this part was less than 1/4 of what the Carrier dealer quoted me for a hard-start kit.

If you don't have a hard start kit on your condenser, this should prolong the compressor life at small cost.
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Verified Purchase
I have a 20kw 3 phase 480vac/14kw 1 phase 240vac 58amp generator. Heavy duty industrial diesel type that I inherited.

I hooked it up at my house as 14kw 1 phase 240. I have a 5 ton 10 seer Heil ac unit that the lra was 97 amps. The generator did not even come close to starting it. I installed the 521 u3 and it cut the lra from 97 to 42. Running amps is about 23.

Tried it on the generator and the engine did not even change pitch! No blinking lights or anything in the house. I am amazed and very pleased.

By the way I kept noticing a strange click when firing up the compressor....then it hit me....what I was hearing was the little relay cutting out. Cool.

Edit......quit working after 5 months. Contacted manufacturer and was told they DO NOT WARRENTY ANY ITEMS SOLD ONLINE. So if you buy it here just no it comes with no warrenty. Buyer beware.
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