coil balance parts

A quick learner from Sun City, Georgetoiwn, TX says:

I'm a handyman who has a customer with broken coil springs and carriers. I need 4 of the carrier 15-102 , and 10 springs. But I'm not sure which weight springs. The windows are single hung vinyl, double glazed, and the outside dimension of the operable vinyl sash is 29.5 x 32.5. I neglected to weigh the windows while I was at the customer's house. I see no marks on the spring I took home with me to indicate what it might be. The customer had information from the the builder's supplier saying they can be either 3050 or 3060, and 3060 will work for either. But that doesn't correlate with what I'm seeing of your numbering system. I'm guessing the window is about 20 lbs, which would mean I need S145-4 . Is that likely correct, or would you suggest a -3, -5, or -6? Thanks so much for any help you can provide.

Wayne 

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Emily from SWISCO responded:

Hi, Wayne. 

The best way to determine the coil weight you need is to weigh the window sash. Once you have the exact weight, you'll divide that by the number of coils on both sides of the window to determine the correct strength option. I'm afraid guesses or estimates won't suffice. 

A quick learner from Sun City, Georgetoiwn, TX says:
Thanks. Guess I'll get back over there and weigh them.
A quick learner from Sun City, Georgetoiwn, TX says:
Hi,
I weighed the windows, and each sash weighs 22.5 lbs. Would you recommend four 5lbs springs, or four 6lb springs, or two 5's and two 6's per sash?

Thanks,
Wayne
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Emily from SWISCO responded:

Thanks for getting back to us, Wayne. Since your sash weighs 22.5 pounds, I recommend using (1) S145-5 5 pound coil spring and (1) S145-6 6 pound coil spring on each side of the window. This would total 22 pounds of overall support which will be fine, so long as the spring weights are within a pound of your sash's actual weight. 

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