S770 Option - which one?

Home Owner from Monument, CO

Aug 16, 2010 9:43 pm

My channel balance has 27TGX stamped on it but is 28" long. Not sure which option to order (28d, 28c or 28b)? It is from a double pane double hung window 42" wide by 60" tall (sliding part of window is 42" wide by 29" tall).

7 Replies

Casey from SWISCO

Aug 17, 2010 8:37 am

Please remove the window sash and place it on a scale.
We need the weight of the window sash in pounds to determine the proper stamp option.

Home Owner from Monument, CO

Aug 17, 2010 10:12 am

Following up on my customer questions and comments. I have a balance that needs replaced. It has 27TGX stamped on the channel but is 28" long. I don't know which one to order. It is on a 42" wide by 29" tall window (these dimensions are of the window that moves). See pics.
Thanks,
Eric

Customer image of their S770 channel balance.

Quick Learner from Monument, CO

Aug 17, 2010 8:37 pm

The window sash is 25 lbs.

Casey from SWISCO

Aug 18, 2010 6:14 am

S770-28 balance with stamp option 28D will carry a window sash weight range of 23 through 28 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.

Casey from SWISCO

Aug 19, 2010 9:41 am

S770-28 with stamp option 28B will carry a window sash weight range of 12 through 18 pounds;
S770-28 with stamp option 28C will carry a window sash weight range of 18 through 23 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.

Quick Learner from Monument, CO

Aug 19, 2010 12:22 pm

What are the sash weight ranges for the 28B and 28C options? I have other windows that will need new balances in the near future.