Chamberlain 3850 User Manual download pdf (Page 24)

Black Button

Purple Button

Push Purple button

twice to enter

unit into

Indicator Light

ADJUSTMENT STEP 2

Setting the Force

The force setting button is located on the left panel of

the motor unit. The force setting measures the amount

of force required to open and close the door.

1. Locate the purple button on the left panel of the motor

unit (Figure 1).

2. Push the purple button twice to enter the opener into

Force Adjustment Mode (Figure 2). The LED (Indicator

Light) will flash quickly.

3. Push the remote control or control console (Figure 3).

The door will travel to the DOWN (close) position. Push

the remote control or control console again, the door

will travel to the UP (open) position. Push the remote

control or control console a third time to send the door

to the DOWN (close) position.

The LED (Indicator Light) will stop flashing when the force

has been learned.

The opener has learned the forces required to open and

close your door.

The door must travel through a complete cycle, UP and

DOWN, in order for the force to be set properly. If the

opener cannot open and close your door fully, inspect your

door to insure that it is balanced properly and is not

sticking or binding. See page 3, “Preparing your garage

door.”

Without a properly installed safety reversal system, persons

(particularly small children) could be SERIOUSLY INJURED or

KILLED by a closing garage door.

• Too much force on garage door will interfere with proper

operation of safety reversal system.

• NEVER use force adjustments to compensate for a binding or

sticking garage door.

• After ANY adjustments are made, the safety reversal system

MUST be tested. Door MUST reverse on contact with 1-1/2"

(3.8 cm) high object (or 2x4 laid flat) on floor.

Indicator

Light

Black Button

Purple Button

Figure 2

Figure 1

Figure 3

WARNING

CAUTION

WARNING

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Chamberlain 3850 User Manual Page 24

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