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Tom from SWISCO responded:
May 3, 2023
Hello! Thanks for reaching out to us. Based on your description of the issue, it sounds like the springs might be too strong compared to the weight of the sash. When a sash drifts up like that, it means that the upward force provided by the balances is more than the downward force provided by the weight of the sash. I see that between the 8 balances you bought, 6 had the 3330 option and 2 had the 3340 option. The 3340 option is definitely too strong for the 20.8 pound sash, since it carries 23 through 28 pounds. That would account for why those sashes are drifting up. When you have that kind of tension pulling up on a 20 pound sash, the balances will win every time. Where I'm confused is with the 3330 option, which accounts for most of your order. These carry 18 through 23 pounds, which should have been perfect for your sash weight. At the risk of asking you to do something you've already done, can you triple check that weight? Can you also verify that this happened for both the 3330 balances and 3340? Reviewing your photos, I don't see anything else that would really explain why the sash is drifting up. The only explanation for that is having a spring that's too strong. |
