Coil Balance Replacement

Home Owner from Winston Salem, NC

Apr 9, 2022 1:42 pm

Window is roughly 60x30. Bottom sash is half that. The coil balance is Bronze. But I'm not sure what length is required. Looking at the photos on your website, I think series 175 coil balance is required. Can you determine the length with the info that I gave?

Please let me know.

Thanks, Steve

4 user uploaded images

6 Replies

Emily from SWISCO

Apr 11, 2022 10:49 am

Hi, Steve.

This isn't the Series 175. You actually have the 15-180 shoe which uses the Series 190 coil springs. There should be a number stamped on the original coil that indicates the strength option. If not, you'll need to remove and weigh your window sash. Then, you'll divide the weight by the number of coils on both sides of the window to determine the correct strength option.

If you have any questions just let me know!

Home Owner from Winston Salem, NC

Apr 11, 2022 6:55 pm

Hi Emily.

I couldn't locate a number on the coil. So, I pulled the window. It weighs appx 18 lbs. I have 1 coil on each side. So what do I need to get? Of course I'll need two. Do you recommend replacing the other parts?

Steve

Emily from SWISCO

Apr 12, 2022 9:14 am

Were you able to get an exact sash weight? These are delicate systems and approximate weights will not suffice, I'm afraid. Choosing the wrong spring weight would make the window harder to close and may even raise up on its own. If you can give me the precise sash weight, I can work out what you need.

You also only need to replace what's broken so, for example, if your pivot shoe is in good shape you can re-use it.

Home Owner from Winston Salem, NC

Apr 12, 2022 10:48 am

Emily,

I weighed the sash. It was 18 pounds, according to my scale. And that's a new scale.

Steve

Emily from SWISCO

Apr 12, 2022 11:00 am

Great! In that case, you can use one S190-940 9 pound coil on each side of the window which will total 18 pounds of overall support.