Need to replace S770-29 Balance and need to figure out weight of sash range

Question

The S770-29 looks like its the one I need. The existing unit is a 3050 single hung. Please see attached picture of stamp on existing balances. It says 2900 BSI LD. Also, I just want to make sure the terminal clip comes included attached with each balance.

Thanks,

Tommy

Paul · Accepted Answer

Hi Tommy, thanks for reaching out to SWISCO. It looks like you have an old spring stamp code that represents a sash weight range between 7-21 lbs. Since that's a really wide range, we feel you can use the 29C option for a sash weight range between 18-23 lbs. This covers most window sashes with insulated glass. Please weight your sash to confirm this will work for you.

Regarding the 15-043 terminal clip, it does come attached to the S770-29. Let us know if you have any more questions before you place your order.