CM6SV65 and 83
Installation Instructions
6
Constructing and Assembling The
Counterweights
The counterweights are critical to the proper operation of the
system. The following procedure identifies how to build
counterweights that are of the proper size for the door being
used. 2 counterweights are required, one for each side.
Calculate Size of Counterweights
1.
Accurately weigh the door panel.
2.
Add 4 1/2 pounds to the weight determined in step 1.
3.
Divide total by 1.46. The result will will be the length of each
counterweight.
Example:
a. Door panel weighs 40 pounds.
b. 40 + 4 1/2 (for plates) = 44 1/2 pounds.
c. 44 1/2 divided by 1.46 = 30.48 or 30 1/2" for length of
counterweight.
4.
Cut 2 pieces of 12" wide x 3/4" thick flakeboard to the exact
length identified in step 3.
5.
Cut 1 piece of 12" wide x 3/4" thick flakeboard to 1 1 /2"
shorter than the length identified in step 3.
IMPORTANT ! :
The weight of the panel MUST equal the
combined weight of the counterweights.
Attaching and Testing The Counterweights
1.
Secure mounting plate to counterweight with screws of
adequate length.
2.
Remove thumbnut from stud on counterweight mounting
plate.
3.
Slide cable eye over stud on the counterweight plate and
securing with thumbnut.
4.
Remove red shipping screws from wheel plates.
5.
Test movement of panel.
6.
Repeat steps 1 through 5 for other counterweight.
NOTE:
If counterweights are sized correctly, the panel should
move up and down with equal effort and hold its
position when stopped. If panel drifts up or down and
will not hold its position, adjust weight of
counterweights accordingly.
7.
After testing is complete attach the panel to the drive chain
by slipping the chain attach angle over the studs on the left
plate and securing with the supplied nylon thumb nuts.
Figure 3
