Hard Start Kits

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Old 07-25-13, 03:55 PM
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Hard Start Kits

I've got a 4 ton American Standard AC unit that I installed in 2006. Single compressor, variable speed air handler. It does a good job, but when it starts, the lights in the house dim.
I thought I'd put in a hard start kit since helping to fix dimming lights seems to be one of the problems they help with.
I started looking at them and I'm not sure what I need to be looking for in the better units.
What's do members of this forum think?
Thanks in advance
 
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Old 07-25-13, 08:06 PM
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I would definitely recommend you install a 3-wire hard start kit. I installed a Supco 3W1 on my Trane heat pump last week. It came with a bracket for easy installation and was easy to install. so far no complaints. Since you have a 4-ton unit you would need a Supco 3W2 or 3W3. As an alternative, i read that the 5-2-1, 3-wire hard start kits were also a good choice. A hard start kit is a capacitor and a potential relay. When the compressor tries to start it pulls current through the potential relay which connects the capacitor into the start winding in the motor to help BOOST the starting of the motor.
 
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Old 07-26-13, 08:24 AM
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fire... , Not sure you answered the question. Does this hard start kit eliminate the dimming lights ?? or it only help boost the starting the motor ?
 
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Old 07-26-13, 09:04 AM
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The way I understand they work is that one of the side effects of helping the compressor is that it also seems to help a dimmiming light problem.
What I'd like to know is what units this forum likes and what should I look for when trying to decide what to buy.
 
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Old 07-27-13, 04:33 AM
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A hard start kit can help to lessen the dimming of lights in the home. I have also heard that moving the A/C breaker closest to the main breaker will help with dimming lights while the a/c starts. you should also go through and make sure everything has good tight connections.
 
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Old 07-27-13, 04:36 AM
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You should buy a 3-wire hard start as suggested above but first you should see if your unit already has a hard start kit. If not the OEM kit is a BAYKSKT257 or KIT07905
 
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Old 07-27-13, 07:37 AM
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It doesn't have one, but thanks for asking.
I like the idea of an OEM unit. I hadn't thought of that as an option.
My research has me believing that a voltage sensing electronic relay is better than a current sensing/mechanical one.
If that's true, is the OEM unit that way?
 
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Old 07-27-13, 08:15 AM
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The OEM and also good 3 wire units use a potential relay. The relay is required to be installed a certain way UP as marked on the relay. The OEM kit also contains the mounting strap and screws as necessary.
 
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Old 07-27-13, 08:30 AM
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One more question. If I go with an aftermarket kit, I need to know horsepower to get the right kit. What's a 4 ton unit convert to?
 
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Old 07-27-13, 08:48 AM
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if aftermarket I recommend 521 csr u3 ..........................................
 
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Old 07-27-13, 09:02 AM
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I looked at the 521 website and it talks about saving run capacitors from degrading. If I'm installing a hard start kit in a 7 year old condenser, should I replace the run cap as well?
 
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Old 07-27-13, 12:17 PM
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You can, it wont hurt anything..... and they are cheap....
 
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Old 07-27-13, 01:21 PM
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Thanks for all of your help.
 
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