Series 600 spiral balance, are they pre-charged?

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Dave Sr. from SWISCO responded:
August 30, 2010
You will have to charge the balances, I usually give the spiral three to four turns to start. I then take precaution by trying the window sash to see if it will operate properly. Then I adjust it accordingly, adding more turns as needed.
A contractor from Chicago says:
August 30, 2010
I have recently placed an order. I am wondering at the time of installation will I need to charge these balances or are they pre-charged? If I need to charge them is there a recommended charge per balance.
25" Series 600 Spiral Tilt Window Balance
25" Series 600 Spiral Tilt Window Balance
S600-25
$8.95
26" Series 600 Spiral Tilt Window Balance
26" Series 600 Spiral Tilt Window Balance
S600-26
$9.05
24" Series 600 Spiral Tilt Window Balance
24" Series 600 Spiral Tilt Window Balance
S600-24
$8.92
Spiral Balance Charging Tool for Tilt Windows
Spiral Balance Charging Tool for Tilt Windows
75-006
$9.97
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
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How to choose the proper spiral balance tip color
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How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
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