SWISCO - The Replacement Hardware Authority

S770 Option - which one?

A home owner from Monument, CO says:
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).
A home owner from Monument, CO says:
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.
Profile picture of Donna
Donna from SWISCO responded:
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.
A quick learner from Monument, CO says:
The window sash is 25 lbs.
Profile picture of Donna
Donna from SWISCO responded:
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.
A quick learner from Monument, CO says:
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.
Profile picture of Donna
Donna from SWISCO responded:
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.
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