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Old 07-13-2012, 01:41 PM   #1
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Hard start capacitor?


My outdoor unit compressor isn't coming on and the last thing I can think of to try is a hard start kit before calling a tech. I'm curious if it matters what type to get. I've heard of 5-2-1 kits, but don't know exactly what that means. Does my unit's specs matter in what I get? If anyone has a recommendation on a specific type or what I need to figure out first, please let me know. Any help is greatly appeciated. Thanks!

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Old 07-13-2012, 03:01 PM   #2
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Hard start capacitor?


does the fan come on? could be just the run capacitor has failed and needs replaced.

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Old 07-13-2012, 03:12 PM   #3
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Hard start capacitor?


Yes, the fan comes on. Already replaced the cap, wasn't it. Thanks for the idea though.
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Old 07-13-2012, 06:14 PM   #4
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Hard start capacitor?


get the one rated for your units tonnage.
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Old 07-17-2012, 07:01 PM   #5
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Hard start capacitor?


I'm on the Grainger site and most are not rated by tonnage. I have a 3 ton unit. Ideas?

http://www.grainger.com/Grainger/wwg...rue&sst=subset
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Old 07-17-2012, 10:07 PM   #6
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Hard start capacitor?


this is an upper end one, good up to 3 tons.
http://www.grainger.com/Grainger/SUP...art-Kit-12H940

but you can use this one, its a bit more economical price wise.
http://www.grainger.com/Grainger/SUP...tart-Kit-4E241
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Old 07-18-2012, 09:37 AM   #7
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Hard start capacitor?


I was all set to order a 5 2 1 kit rated for 3 tons and then read this:

" This kit is great for any type compressor (scroll or reciprocating). Easy to install & will not harm compressor windings because of the lower capacitor rating (88-108uf). (If you need a Hard Start kit to try to free a stuck compressor you will need a kit with a much higher uf rating."

Is this true? I don't see uf ratings on any that I've looked at.
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Old 07-18-2012, 01:22 PM   #8
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Hard start capacitor?


Quote:
Originally Posted by mikegp View Post
I was all set to order a 5 2 1 kit rated for 3 tons and then read this:

" This kit is great for any type compressor (scroll or reciprocating). Easy to install & will not harm compressor windings because of the lower capacitor rating (88-108uf). (If you need a Hard Start kit to try to free a stuck compressor you will need a kit with a much higher uf rating."

Is this true? I don't see uf ratings on any that I've looked at.
I'd do their middle one if you have a 3 ton unit.
If you have money burning a hole in your pocket, then go for their larger one.
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Old 07-18-2012, 01:53 PM   #9
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Hard start capacitor?


Can't overdoing it hurt the compressor?
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Old 07-18-2012, 03:08 PM   #10
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Hard start capacitor?


A start kit is generally used to help a compressor start against a load (like a TXV system, for example). Those should be rated to match the compressor and other factors (generally sized by the tonnage of the system). If you use the correct size kit, you won't do any more damage to the compressor than is necessary (a hard start kit always causes some form of damage - it's just a jolt of high current, after all).

If you're trying to free a stuck compressor, then you would really need two kits - a big one to try and free the compressor, and then another that's sized correctly to permanently install to try. However, if you're dealing with a stuck compressor, then you've got a lot more expense on the way (stuck = about to die)
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Old 07-18-2012, 08:03 PM   #11
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Hard start capacitor?


Quote:
Originally Posted by mikegp View Post
I was all set to order a 5 2 1 kit rated for 3 tons and then read this:

" This kit is great for any type compressor (scroll or reciprocating). Easy to install & will not harm compressor windings because of the lower capacitor rating (88-108uf). (If you need a Hard Start kit to try to free a stuck compressor you will need a kit with a much higher uf rating."

Is this true? I don't see uf ratings on any that I've looked at.
The kit for the 3 ton is one that is intended for normal use to boost starts. if you suspect that your compressor is on its last legs and will go out soon no matter what. then yes you want to use one that reaches 180 or 200 plus uf.


The average compressor that has trouble starting, will do fine on that 88-108 kit.
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Old 07-19-2012, 03:53 AM   #12
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Hard start capacitor?


Quote:
disagree
Explain.

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