series 140 constant force balance

Landlord from Queenstown, Maryland

Feb 19, 2021 11:42 am

I have identified the part I need as a Series 140 single coil balance but not sure of weight needed. Mine has no lb. marking but the window sash measures 26" X 28" and is a double pane glass. What would you reccommend?

4 Replies

Bob from SWISCO

Feb 22, 2021 9:51 am

I am afraid we can't estimate weight from dimensions. The best thing to do would be to weigh the sash on a scale. Give us that exact weight, and we can work out what you need. To be safe, I'd also like to see the coil balance systems you're working with, preferably out of the window. Many thanks.

Landlord from Queenstown, Maryland

Feb 23, 2021 1:56 pm

Hello Bob,

I've uploaded a picture of the coil balance. The weight of window sash is 14.4 lbs. If you need more info., let me know and thanks for your help.

Dave

1 user uploaded image

Bob from SWISCO

Feb 23, 2021 2:07 pm

That's perfect Dave, thanks. This is the 15-175 Pivot Shoe, which uses our Series 152 Coil Balances sold separately. if the window weighs 14.4 pounds, you want to use a S152-7 7 pound spring on each side of the sash. This equals 14 pounds of overall support, which is certainly close enough to the reported sash weight. Let me know if you have further questions.