Adjustment - Chamberlain Merlin MJ3800 Installation And Operating Instructions Manual

Without a properly installed safety reversal
system, persons (particularly children) could be
SERIOUSLY INJURED or KILLED by a closing the
door.
• Safety reversal system MUST be tested every
month.
• If one control (force or travel limits) is
adjusted, the other control may also need

adjustment.

• 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 the floor.
Without a properly installed safety reversing
sensor, persons (particularly children) could be
SERIOUSLY INJURED or KILLED by a closing
door.
40mm (1 1/2") obstacle
ADJUSTMENT STEP 5
Test the Safety Reversal System
TEST
• With the door fully open, place a 40mm (1 1/2")
obstacle on the floor, centered under the the door.
• Operate the door in the down direction. The door must
reverse on contact with the obstruction. Upon
successful safety reversal test proceed to "Adjustment
Step 6 ".
ADJUST
• If the door stops on the obstruction, it is not traveling
far enough in the down direction. Complete
Adjustment Steps 1 and 2 Programming the Limits
and Forces.
• Repeat the test.
• When the door reverses on the 40mm (1 1/2")
obstacle, remove the obstruction and run the opener
through 3 or 4 complete travel cycles to test
adjustment.
• If the unit continues to fail the Safety Reverse Test,
call for a trained door systems technician.
IMPORTANT SAFETY CHECK:
Test the Safety Reverse System after:
• Each adjustment of limits, or force controls.
• Any repair to or adjustment of the door (including
springs and hardware).
• Any repair to or buckling of the floor.
• Any repair to or adjustment of the opener.
ADJUSTMENT STEP 6
Test The Protector System
• Press the transmitter push button to open the door.
• Place the opener carton in the path of the door.
• Press the transmitter push button to close the door.
The door will not move and the LED indicator light will
flash twice.
The door opener will not close from a transmitter if the
indicator light in either sensor is flashing or off (alerting
you to the fact that the sensor is misaligned or
obstructed).
If the opener closes the door when the safety
reversing sensor is obstructed, do not operate the
door. Call for a trained door systems technician.
16
Safety Reversing Sensor
®
Safety Reversing Sensor