Merlin MJ3800 Installation And Operating Instructions Manual page 15

ADJUSTMENT STEP 2
Setting the Force
The force setting button is located on the front panel.
The force setting measures the amount of force
required to open and close the door.
1. Locate the orange button on the unit (Figure 1).
2. Push the orange button twice to enter unit into
Force Adjustment Mode (Figure 2). The LED
(Indicator Light) will flash quickly.
3. Push the transmitter, wireless wall button or
multi-function door control (Figure 3). The door
will travel to the DOWN (close) position. Push
the transmitter, wireless wall button or multi-
function door control again, the door will travel
to the UP (open) position. Push the transmitter,
wireless wall button or multi-function door
control a third time to send the door to the
DOWN (close) position.
The LED (Indicator Light) will stop flashing when
the force has been learnt.
The unit has learnt 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 unit cannot open and close your
door fully, inspect your door to ensure that it is
balanced properly and is not sticking or binding.
See page 4, "Preparing your door."
Without a properly installed safety reversal
system, persons (particularly children) could be
SERIOUSLY INJURED or KILLED by a closing the
door.
• NEVER learn forces or limits when door is
binding or sticking. Repair door first
• Too much force on door will interfere with
proper operation of safety reversal system.
• After ANY adjustments are made, the safety
reversal system MUST be tested. Door MUST
reverse on contact with 40mm (1 1/2") high
obstacle on floor.
Figure 1
Indicator
Light
Orange
Button
Figure 3
ADJUSTMENT STEP 3
Test Cable Tension Monitor
If your cable tension monitor has been activated
the unit will not close (the LED will flash 9 times).
See (Figure 1) page 9.
ADJUSTMENT STEP 4
Test Powered Door Lock
TEST
• With the door fully closed, the powered door lock
bolt should be protruding through the track.
• Operate the door in the open direction. The
powered door lock should retract before the door
begins to move.
• Operate the door in the down direction. When
the door reaches the fully closed position, the
powered door lock should automatically activate
to secure the door.
NOTE: If the powered door lock does not function, the
lock can be manually released by sliding the manual
release handle to the open position.
15
Figure 2
Black
Button
Push Orange button
twice to enter
unit into Force
Adjustment Mode
or
BLACK
ORANGE