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-   -   Hard start capacitor? (http://www.diychatroom.com/f17/hard-start-capacitor-150143/)

mikegp 07-13-2012 02:41 PM

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!

NitroNate 07-13-2012 04:01 PM

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

mikegp 07-13-2012 04:12 PM

Yes, the fan comes on. Already replaced the cap, wasn't it. Thanks for the idea though.

beenthere 07-13-2012 07:14 PM

get the one rated for your units tonnage.

mikegp 07-17-2012 08:01 PM

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

beenthere 07-17-2012 11:07 PM

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

mikegp 07-18-2012 10:37 AM

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.

AndrewF 07-18-2012 02:22 PM

Quote:

Originally Posted by mikegp (Post 968705)
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.

mikegp 07-18-2012 02:53 PM

Can't overdoing it hurt the compressor?

scottmcd9999 07-18-2012 04:08 PM

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)

beenthere 07-18-2012 09:03 PM

Quote:

Originally Posted by mikegp (Post 968705)
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.

scottmcd9999 07-19-2012 04:53 AM

Explain.


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