Supporting the Window | Pella 81470102 specification

3CABLE CLAMP INSTALLATION (CONTINUED)

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HEADER MOUNT OF CABLE CLAMPS

This method may only be used if the projection of the bay/bow is 18"or less. Use the Cross Bracing method if the projection of the bay/bow is more than 18".

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Note: Be sure that the cable clamps are secured to a solid structural member - header, sill plates or wall stud. If the structural member or cable clamps are not securely attached, they may loosen during or after installation causing the bay/bow unit to sag.

A. Install the cable clamps. Drive the #12 x 3-1/4"

square screws part way into the mounting surface

using a #3 square drive bit.

DASHED LINES INDICATE POSSIBLE CONSTRUCTION FOR GABLE ROOF

MINIMUM

10-1/2”

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B. Run the cable up through the bottom of the

cable clamp. Hold the cable up tight above the

clamp and drive the two center clamp screws all

the way in to lock the cable in place. Drive in the

remaining #12 x 3-1/4" square screws all the way.

Note: Make sure all 4 screws are driven in at

maximum torque. Additional tensioning may

be done with the nuts on the opposite end of the

cable at the bottom of the window.

HEAD BOARD

18" PROJECTION

MAXIMUM

SEAT BOARD

4SUPPORTING THE WINDOW

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A.Tighten the top hex nut on both cable ends. Using a 3/16" wrench or socket, hold the cable end in position while tightening the top hex nut with a 1/2" wrench or socket. This will keep the cable from twisting as the hex nuts are tightened.

B.Remove the temporary bracing. Check the window for level, plumb, sash reveal and operation. Readjust, if needed.

Note: Be sure to use the temporary support when readjusting the hex nuts.

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C. Remove blocking from under the seat board.

D.Tighten the locking (bottom) nut on both cable ends and remove the temporary support once the final position is found. DO NOT cut the threaded end off the cable as this will prevent future adjustment should it be needed.

E.Installation of knee braces is recommended to help support the weight of the bay/bow unit. Weight calculations must take into account the weight of the items that may be placed on the seat board of the bay/bow unit. If the upper roof/framing members are not capable of supporting 1,300 lbs. or if more than 500 lbs. will be put on the seat board, knee braces must be used in addition to the cables.