Adjustment; Test The Safety Reversal System - Chamberlain Merlin MJ3800R Installation And Operating Instructions Manual

ADJUSTMENT STEP 3

TEST THE SAFETY REVERSAL SYSTEM

TEST
• With the door fully open, place a 40mm (1 1/2") obstacle on
the floor, centered under 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 4 ".
ADJUST
• If the door stops on the obstacle, 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 obstacle 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 4
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.
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.
TM
16
40mm Test obstacle