About Coil Balances

Question

Hi,
I am in Japan, and one of a window in my house have been very hard to open for a while. I removed coils which were broken. They seem to be Double coil balance (Series 210 Roller-Tilt Balance). Please check some photos I attached.
I am thinking if they could exchange to1/2" Coil Double Support or 1/2" Coil Triple Support, because it seems to easier to install and heavy duty than broken one. The weight of the window is about 26lb7.3oz.,Size is W32 43/64"xH29 9/64".
Some parts i choose are following. S160-07x4?15-191x2?15-150Dx2?26-241x2
Would you give me some advices which Coil Balances I should choose. Thank you.

Bob · Accepted Answer

Thanks for posting. This looks like a 15-087 Coil Shoe and 15-086 Housing, along with a 16-024 Bracket. This assembly works with Series 180 Coil Balances. For a sash that weighs just over 26 pounds, go with (2) S180-07 7 pound springs and (2) S180-06 6 pound springs. Use one of each on both sides of the sash. This will equal 13 pounds of support on either side, for a total of 26 pounds of support overall. Let me know if you have further questions.

Series 180 coil balance diagram