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SAFETY SENSORS
The Safety Sensors, model 916GA, are intended for
installation with the operators covered in this manual.
To order call: 1-866-826-4943 or visit
www.chamberlain-diy.com.
HARDWARE
• 5/16" mounting hardware for gate bracket.
• The following hardware is needed to mount the control box
depending on the mounting surface:
Wood: Four #8 1-1/4" zinc plated wood screws.
Metal: Four #10-32x6" zinc plated machine screws with
nut and lock washers.
Concrete, Brick, etc.: Four 1/4" x 1-3/4" masonry screws.
LOW VOLTAGE WIRE
The low voltage wire is needed to connect the transformer
to the control box. The specific length required depends on
the distance from the indoor outlet to the control box.
Measure carefully, it is not recommended to splice low
voltage wire.
UL approved Class 1 or Class 3 direct burial/underground,
sunlight/UV resistant 16 gauge 2-conductor/stranded low
voltage lighting wire.
The following products are available at most home center
hardware stores and meet these specifications:
• Chamberlain Models 917GA or 918GA
AUTOMATIC GATE LOCK AND HARD STOPS (OPTIONAL)
In windy areas to ensure the gate stops at the same place
each time we recommended the purchase of an automatic
gate lock for the closed position and hard stop(s) for the
open position.
GA420D Only:
JUNCTION BOX
The Junction Box is needed to connect the second arm to
the extension cable (GA420D Installation Only).
• UL Listed outdoor/all-weather junction box with a
minimum of two 3/4" NPT threaded port and appropriate
all-weather cover.
• Conduit fitting to connect 3/4" PVC Schedule 40 conduit
to junction box.
CONDUIT
The conduit is needed to hold the interconnecting cable
between the Junction and Control Box (GA420D
Installation Only).
• 3/4" diameter UL Listed outdoor electrical conduit
7 Introduction
Tools Needed
During assembly, installation and adjustment of the operator, instructions will call for tools as illustrated below.
Additional Items For Purchase
The following items are REQUIRED to complete the installation.
Screwdriver
Adjustable End Wrench
Tape Measure
2
1
Pencil
Carpenter's Level
Clamps
Phillips Head Screwdriver
Deep Well Sockets
and Wrench
1/2", 5/8", 7/16", 9/16"
and 1/4"
Hammer
Drill
Drill Bits
1/2", 3/16", 5/16"
and 5/32"
Wire Cutters (Optional)Wire Strippers (Optional)
Welder (Optional)