Chamberlain 248730 User Manual download pdf (Page 31)

Adjustments

STEP 3 Test the Safety Reversal System

Without a properly installed safetyreversal system,persons (particularly small children) could be

SERIOUSLY INJURED or KILLED by a closing garage door.

• Safety reversal system MUST be tested every month.

• After ANY adjustments are made, the safetyreversal system MUST be tested. Door MUSTreverse

on contact with 1-1/2" (3.8 cm) high object(or 2x4 laid flat) on the floor.

1. With the door fully open, place a 1-1/2 inch (3.8 cm) board (or a 2x4 laid flat) on the floor,

centered under the garage door.

2. Press the remote control push button to close the door. The door MUST reverse when it makes

contact with the board.

If the door stops and does not reverse on the obstruction, the down travel needs to be increased (refer to

Adjustment Step 1). Repeat the test.When the door reversesupon contact with the 1-1/2 inch board,

remove the board and open/close the door 3 or 4 times to test the adjustment.If the garage door opener

continues to fail the safety reversal test,call a trained door systemstechnician.

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STEP 4 Test the Protector System

Without a properly installed safety reversing sensor, persons (particularly small children) could be

SERIOUSLY INJURED or KILLED by a closing garage door.

1. Open the door. Place the garage door opener carton in the path of the door.

2. Press the remote control push button to close the door. The door will not move more than an

inch (2.5 cm),and the garage door opener lightswill flash 10 times.

The garage door opener will not close from a remote control if the LED in either safety reversing sensor

is off (alerting you to the fact that the sensor is misaligned or obstructed). Ifthe garage door opener

closesthe door when the safetyreversing sensor is obstructed (and the sensors are no more than 6

inches [15 cm] above the floor), call for a trained door systemstechnician.

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Chamberlain 248730 User Manual Page 31