how to determine sash weight

Question

One of our channel balances' sash cord broke. There is no ID on windows or sash balance. I'm trying to order the right balances. Window is Non-Tilting double hung vinyl 48" x 72". Please recommend sash weight? I think I need S385-26 with 15-004 shoe & 19-005 top attached. Thank you for your informative web site. Builder data said these are Viking vinyl windows but there is no info on them except "series 400, H-R35 - 48x72" "UM111" "AAMA/NWWDA 101/1.S.2-97"

Paul · Accepted Answer

Thanks for posting! With no stamp on the balance itself, you will need to weigh your sash to determine the proper strength option. There is a chart on the S385-26 store page that lets you know what what option can support what weight. As for what Series you need, I can't be sure. The best way to determine that is to confirm that the 19-005 and 15-004 are exactly the same as your current attachments.