Bedroom window trouble

Question

Had a window in bedroom fogging up and had glass company change out the glass. After the glass was changed the window would not stay up. The Techs said the balances looked good, but thought balance was getting weak or the new glass installed was heaver than the original. Could not find any marking on the window to identify the manufacture/model.

Info:
Weight of window is 26.5 lbs
throw (up/down) of window 25.5"
dual coils in balance each marked 540. coils are attached one on each side of the pivot shoe.
balance: 3"(H) x 1-1/4" (W) X 1/2" (D)
Pivot bar (U channel) same dia as your 26-089 or 26-040
Pivot shoe same diam as your 15-046 (1-1/4"(w) X 1/2" (D)

Let me know what you recommend to keep the window from closing.

Thank & waiting your response

Tom · Accepted Answer

You don't have a 15-046 pivot shoe, you have the 15-180. This is designed specifically to work with the Series 190 spring, so that's what you want to look into.

I can see the problem right away; your current springs are only rated for 5 pounds of support each. With two on each side, that's only 20 pounds of support. Like my gut on Christmas, your window appears to have gained 6.5 pounds. That's not a big deal, though, we can easily compensate for that with a new combination of springs.

I think a better combination now would be to use one 7 pound spring and one 6 pound spring per side. That will give you 13 pounds of support on each side, for a total of 26 pounds. That should be fine, you won't miss that last half a pound.

With that in mind, I recommend an S190-740 and S190-640 coil spring. You can reuse your old shoe and clips, they should be totally compatible.