Tilt window (15 pounds) is hard to open. Do the coil springs fail? Note - I have not tampered with or removed the coil springs / shoe. Any advice?
P.S. - I forgot to mention the following. The pivot shoes are still lively when I turn the blue disc while pushing into to position when reattaching the tilt window. Also, I lubricated the shoes and window frame using silicone spray. This window faces west and gets hit with extreme temperatures. Cold wind from the west in the winter and direct sun in the summer. I wonder if the window frame is whacked.
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Bob from SWISCO responded:
September 21, 2021
If the window is hard to open, I think it's safe to assume the coil balances should be replaced. See our 15-087 Shoe and 15-086 Tandem housing. This system uses our Series 180 Coil Balances. If the window weighs exactly 15 pounds, then you could use simply one of the 7 pound S180-7 springs on either side of the window, which would equal 14 pounds of support overall--being within 1 pound of the exact sash weight will work fine. In that case, you wouldn't need the Tandem housing for separate coils either. Let me know if the sash has a different exact weight, or if you have any other questions. |
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Bob from SWISCO responded:
September 22, 2021
Hi Randy. Thanks for the kind words! Always glad to help. If the window weighs exactly 18 pounds, then use two of the S180-9 9 pound coils, one for each side of the sash. That will equal 18 pounds of support. Your older coil springs likely had weaker spring weights, which is why you needed two of them per side. So you will not need the 15-086 tandem housing when re-installing these. The image below shows generally how this system fits into the jamb track. 
Detail of 15-086
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