Chamberlain manual 23

MOUNTING AND WIRING THE SAFETY		Figure 5
REVERSING SENSORS		Wing Nut
• Slide a 1/4"-20x1/2" carriage bolt head into the slot
		1/4"-20
	on each sensor. Use wing nuts to fasten sensors to
	brackets, with lenses pointing toward each other
	across the door. Be sure the lens is not obstructed	Carriage Bolt
	by a bracket extension (Figure 5).
		1/4"-20x1/2"
•	Finger tighten the wing nuts.	Lens
•	Run the wires from both sensors to the opener. Use	TROUBLESHOOTING THE SAFETY
	insulated staples to secure wire to wall and ceiling.
		REVERSING SENSORS
•	Strip 1/4" (6 mm) of insulation from each set of
		1. If the sending eye indicator light does not glow
	wires. Separate white and white/black wires
		steadily after installation, check for:
	sufficiently to connect to the opener terminal
		• Electric power to the opener.
	screws: white to 2 and white/black to 3 (Figure 6).
		• A short in the white or white/black wires. These
ALIGNING THE SAFETY REVERSING SENSORS
		can occur at staples, or at terminal connections.
•
	Plug in the opener. The indicator lights in both the	• Incorrect wiring between sensors and opener.
	sending and receiving eyes will glow steadily if
		• A broken wire.
	wiring connections and alignment are correct.
		2. If the sending eye indicator light glows steadily but
The sending eye amber indicator light will glow
		the receiving eye indicator light doesn't:
regardless of alignment or obstruction. If the green
		• Check alignment.
indicator light in the receiving eye is off, dim, or
flickering (and the invisible light beam path is not		• Check for an open wire to the receiving eye.
obstructed), alignment is required.		3. If the receiving eye indicator light is dim, realign
•	Loosen the sending eye wing nut and readjust,
		either sensor.
	aiming directly at the receiving eye. Lock in place.	NOTE: When the invisible beam path is obstructed
•	Loosen the receiving eye wing nut and adjust
		or misaligned while the door is closing, the door will
	sensor until it receives the sender’s beam. When	reverse. If the door is already open, it will not close.
	the green indicator light glows steadily, tighten the	The opener lights will blink 10 times. (If bulbs are not
	wing nut.	installed, 10 clicks can be heard.) See page 21.
		Connect Wire to
Figure 6		Opener Terminal Screws
	Finished Ceiling
	Bell Wire

Safety Reversing Sensor

Bell Wire		Sensor
Door Control		Connections
Connections
(dotted line)
1	2	3

OPENER TERMINAL SCREWS

Safety Reversing Sensor

Invisible Light Beam

Protection Area

23