LCN 4840 Installation Instructions Manual - Figure 4
6
Opening Speed Adjustment
L
NOTE: For air pressure regulation, see control box instructions.
6a The door opening speed must be adjusted to suit the width and weight of door. The wider and / or heavier the door,
the slower it should open. To determine opening speed, measure door width and weight and set speed to open door
from 0° to 80° for the time shown in
Table 3 below. The opening speed control adjusting screw is located in the end
of the door operator near the tubing connection
(see Figure 4). Using a 3/32” hex wrench (provided), turn the speed
control clockwise to slow the door, counterclockwise to increase door speed.
Opening
Speed Control
Adjusting Screw
(Socket Head Regulating Screw)
Operator
Model No.
Figure 4
Table 3
Door Weight
in Pounds
Fastest Opening Time in Seconds to 80°
Position
Door Width in inches
36”
42”
48”
100 lbs.
3.0 sec.
3.0 sec.
3.0 sec.
125 lbs.
3.5 sec.
3.5 sec.
3.5 sec.
150 lbs.
3.5 sec.
3.5 sec.
3.5 sec.
200 lbs.
4.0 sec.
4.0 sec.
4.0 sec.
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NOTE: if door width or weight is between the sizes and pounds listed, use the time shown for the next wider or heavier
door.
6b If door weight cannot be measured, the weight can be estimated by finding the area of the door (length x width) and
multiplying it by the weight per square foot for the door type that is being used, as shown in
Table 4 below.
Table 4
Door Type
Weight per Sq. Ft.
Solid Core Wood
20 Ga. Flush Hollow Metal
Aluminum x 1” Glass
5.5
Mineral Core Door
16 Ga. Flush Hollow Metal
Aluminum x 1” Glass
7.0