Chamberlain 3900PLD Figure, Figure, Figure, Figure, INSTALLING THE BRACKETS, Floor installation (Figure 4):, Wall installation (Figure 2 and 3):

INSTALLING THE BRACKETS

Be sure power to the operator is disconnected. Install and align the brackets so the safety reversing sensors will face each other across the door, with the beam no higher than 6" (15 cm) above the floor. They may be installed in one of three ways, as follows.

Door track installation (preferred) (Figure 1):

•Slip the curved arms over the rounded edge of each door track, with the curved arms facing the door. Snap into place against the side of the track. It should lie flush, with the lip hugging the back edge of the track, as shown in Figure 1.

If your door track will not support the bracket securely, wall installation is recommended.

Wall installation (Figure 2 and 3):

Figure 1 DOOR TRACK MOUNT (RIGHT SIDE)

Door

Track

Lip

Indicator

Light

Sensor
Bracket	Lens

• Place the bracket against the wall with curved arms

facing the door. Be sure there is enough clearance for

the sensor beam to be unobstructed.

• If additional depth is needed, an extension bracket

(See Accessories) or wood blocks can be used.

• Use bracket mounting holes as a template to locate and

drill (2) 3/16" diameter pilot holes on the wall at each

side of the door, no higher than 6" (15 cm) above

the floor.

• Attach brackets to wall with lag screws (Not provided).

• If using extension brackets or wood blocks, adjust right

and left assemblies to the same distance out from the

Figure 2

Inside

Wall

WALL MOUNT (RIGHT SIDE)

Fasten Wood Block to Wall with Lag Screws (Not Provided)

Indicator

Light Sensor

Bracket

Lag Screws

(Not Provided)

Lens

mounting surface. Make sure all door hardware

Figure 3 WALL MOUNT (RIGHT SIDE)

obstructions are cleared.

Floor installation (Figure 4):

•Use wood blocks or extension brackets (See Accessories) to elevate sensor brackets so the lenses will be no higher than 6" (15 cm) above the floor.

•Carefully measure and place right and left assemblies at the same distance out from the wall. Be sure all door hardware obstructions are cleared.

•Fasten to the floor with concrete anchors as shown.

HARDWARE SHOWN ACTUAL SIZE

Inside

Wall

(Provided with Extension Bracket)

Figure 4

Extension

Bracket

(See Accessories)

(Provided with Extension Bracket)

Sensor

Bracket

Indicator

Lens Light

FLOOR MOUNT (RIGHT SIDE)

Carriage Bolt	Wing Nut	Staples
1/4"-20x1/2"	1/4"-20

Inside	Attach with
	Concrete Anchors
l
al	(Not Provided)
W
	Lens
	Indicator
	Light
	Sensor
	Bracket

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