Window channel balance slection

A home owner from Minneapolis says:
Hello,

I have several vinyl non tilt windows that open vertically with 2 channel balances that are not sliding smoothly (jerky/stiff especially when closing) and/or have one channel balance that appears broken. I have taken pictures of one of the windows to hopefully get some advice on how to select the right channel balances. For this window, the 2 channel balances do not match (one says BSI 2430 and one says BSI 2340), which may explain why one side does not close without applying a lot of force. The 2340 balance also seems to have a broken string. The glass on the window measures 23&5/16 in height. The sash weighs 17 pounds. The channel balances are 1/2" width.I think I need the S351 or the S390 series but am not sure which one. Based on the glass and weight I am thinking I should have the 2330 in one of these series.

My hope is if I can get advice on what to select for this window, I can choose the right ones for the other windows too.

Thank you,
Kevin
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Casey from SWISCO responded:

Hi Kevin,

I agree that  It looks like you need either our S351-24 , with a 15-002 bottom attachment, or S390-24 , with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to know a 2330 spring strength option like you mentioned for your replacement balances. I would recommend purchasing two replacement balances to make sure your window has equal support on both sides of the sash. Thank you! 



Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
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How to Replace a Non-Tilt Channel Balance
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How to Repair a Jammed Window
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