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2
Light Curtain
Receiver
Light Curtain
Transmitter
12" (30.5 cm) minimum
above the photoelectric
sensors and away from
the door
Primary Monitored
Entrapment Protection Device
(Photoelectric Sensors)
Secondary entrapment protection ONLY
Primary entrapment protection
6" (15 cm) maximum
above the floor
and away from the door
Receiver
Transmitter
To prevent possible SERIOUS INJURY or DEATH from a closing door:
• Be sure to DISCONNECT POWER to the operator BEFORE installing
the Light Curtain.
• The door MUST be in the fully opened or closed position BEFORE
installing the Light Curtain.
• Correctly connect and align the Light Curtain transmitter and receiver.
• The Light Curtain is for use with LiftMaster
®
Commercial Doors. Use
with ANY other product voids the warranty.
• DO NOT use this product for the protection of dangerous machinery
or in explosive atmospheres or radioactive environments. Use ONLY
specifi c and approved types of devices for such applications.
• The Light Curtain MUST be installed ONLY by authorized and fully
trained personnel.
• LiftMaster Monitored Entrapment Protection devices are required in
addition to the Light Curtain. The Light Curtain may NOT be used as
the sole entrapment protection device for ANY entrapment zone.
IMPORTANT INFORMATION ABOUT THE LIGHT CURTAIN
LiftMaster
®
Light Curtain (Model LC-36A) is an ancillary entrapment protection device used with sectional and rolling doors that is designed with 8
optical sensors that form 22 total invisible light beams. These light beams create a cross-pattern or netting effect for maximum protection against
entrapment. When properly connected and aligned, the Light Curtain will detect an obstruction in the path of the light beams. If an obstruction breaks
any light beam while the door is closing, the operator will stop and reverse to the full open position. The invisible light beam must be unobstructed. No
part of the door (or door tracks, springs, hinges, rollers or other hardware) may interrupt the light beam while the door is closing.
The Light Curtain Transmitter must be installed facing the Light Curtain Receiver across the entrapment zone, 12" (30.5 cm) above the primary
monitored entrapment protection device. The minimum installation width is 3 feet (.91 m) and the maximum width is 33 feet (10 m).
INTRODUCTION
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