Nu Air window repair

A quick learner from Clearwater FL says:
November 10, 2015
It is 1/2" 2830 stamped on metal rail.
Window will not stay in any up position and is coming out when raised on metal channel side (left).
How do I repair and what parts are needed?
jamie
User submitted photo of their window hardware.
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Tom from SWISCO responded:
November 12, 2015
Thanks for posting, Jamie. I'm afraid I cannot identify what balance you have based on the information provided. I would need to see a clear picture of both ends.

That said, I don't think the balance is the problem. It appears to have shot up past the sash. Is that correct? If so, I believe your top sash guide has broken. Look at our video below for more information.
A quick learner from Clearwater FL says:
November 17, 2015
Help
I have attached a bunch of new pictures.
Some of the bad window and some of good window.
The balance or metal channel is only on one side.
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Tom from SWISCO responded:
November 17, 2015
Thanks! I have received your new pictures, however your hardware is still installed in the window. In order to identify either the top sash guide or balance, I will need you to remove them from the window entirely so that we can see the whole piece. I would also need your measurements.
A quick learner from Clearwater FL says:
November 18, 2015
OK how do I take it out?
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Tom from SWISCO responded:
November 18, 2015
I recommend that you watch the video I posted above, which shows you exactly how to remove both the top sash guide and balance.
A quick learner from Clearwater FL says:
November 18, 2015
Tom I did watch, but our balance is at the top and only on that side and have tried without tools to move down. It;s stuck in window stop?
WE did see a clip on the window sill, but cannot see where it's from, with window up or down.
There is a similar clip on the right side of the window?
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Tom from SWISCO responded:
November 18, 2015
It's not always easy pulling the balance down when it has shot up like that, but there is no other way. It will just take some patience and elbow grease. If you are unable to do so, you may want the help of a local handy person who is familiar with this kind of window.
A quick learner from Clearwater FL says:
November 19, 2015
New pictures.
Got window out and balance down.
This window is 51 inches wide, is it possible that it was missing a balance on the right side as well?
There are other windows in the house with only left balance.
Hope we can get to what to order now.
User submitted photo of their window hardware.
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Tom from SWISCO responded:
November 19, 2015

Great, thank you! The top sash guide looks like our 18-178, and the balance may be our Series 385. See the video below which details how to identify proper balance replacements. Check them out and let me know what you think!
A contractor from Oldsmar fl. says:
May 31, 2023
Checking to make sure I order correct balancers for a nuair window the stamp is 2820 and looks like a 70 series according to stamp. If you could let me know so I can order new ones from you. I am attaching pic of stamped balance. Thank you Randi Martin
Thumbnail of the uploaded file named 20230531_120134.jpg
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Tom from SWISCO responded:
June 2, 2023

I'm not sure what you have, unfortunately. We have dozens of different balances with that stamp. It's not a product code or anything, nor does it have any bearing on the Series. All it tells you is the strength of the spring.

In order to figure out what Series this is, I need you to remove an undamaged version of this balance from the window and show me clear pictures of the top and bottom nylon fittings. I will also need to know the dimensions of these fittings.
29" Series 385 Channel Balance
29" Series 385 Channel Balance
S385-29
$11.10
Channel Balance Guide Pair
Channel Balance Guide Pair
18-178
$2.57
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