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2
Preparation
Safety Symbol and Signal
Word Review
This garage door opener has been designed
and tested to offer safe service provided it is
installed, operated, maintained and tested in
strict accordance with the instructions and
warnings contained in this manual.
When you see these Safety Symbols and
Signal Words on the following pages, they
will alert you to the possibility of serious
injury or death if you do not comply
with the warnings that accompany them.
The hazard may come from something
mechanical or from electric shock. Read the
warnings carefully.
1 Disable locks and remove any ropes
connected to the garage door.
2 Lift the door halfway up. Release the
door. If balanced, it should stay in place,
supported entirely by its springs.
3 Raise and lower the door to check for
binding or sticking. If your door binds,
sticks, or is out of balance, call a trained
door systems technician.
4 Check the seal on the bottom of the
door. Any gap between the fl oor and
the bottom of the door must not exceed
1/4 inch (6 mm). Otherwise, the safety
reversal system may not work properly.
5 The opener should be installed above the
center of the door. If there is a torsion
spring or center bearing plate in the way
of the header bracket, it may be installed
within 4 feet (1.2 m) to the left or right of
the door center. See Installing the Header
Bracket section.
Check the Door
To prevent damage to garage door and
opener:
• ALWAYS disable locks BEFORE
installing and operating the opener.
• ONLY operate garage door opener
at 120 V, 60 Hz to avoid malfunction
and damage.
To prevent possible SERIOUS INJURY
or DEATH:
• ALWAYS call a trained door systems
technician if garage door binds,
sticks, or is out of balance. An
unbalanced garage door may NOT
reverse when required.
• NEVER try to loosen, move or adjust
garage door, door springs, cables,
pulleys, brackets or their hardware,
ALL of which are under EXTREME
tension.
• Disable ALL locks and remove ALL
ropes connected to garage door
BEFORE installing and operating
garage door opener to avoid
entanglement.
Torsion Spring
Extension Spring
Mechanical
Electrical
When you see this Signal Word on the
following pages, it will alert you to the
possibility of damage to your garage door
and/or the garage door opener if you do not
comply with the cautionary statements that
accompany it. Read them carefully.
Additional items you may
need for installation:
Survey your garage area to see if you will
need any of the following items:
A. (2) 2X4 PIECES OF WOOD
May be used to fasten the header
bracket to the structural supports.
Also used to position the garage
door opener during installation
and for testing the safety reversing
sensors.
B. SUPPORT BRACKET AND
FASTENING HARDWARE
Must be used if you have a
fi nished ceiling in your garage.
C. EXTENSION BRACKETS (MODEL
41A5281) OR WOOD BLOCKS
Depending upon garage
construction, extension brackets
or wood blocks may be needed to
install the safety reversing sensor.
D. FASTENING HARDWARE
Alternate fl oor mounting of the
safety reversing sensor will require
hardware not provided.
E. EMERGENCY KEY RELEASE
(MODEL 7702CB)
Required if you do not have an
access door in addition to your
garage door.
F. DOOR REINFORCEMENT
Required if you have a lightweight
steel, aluminum, fi berglass or
glass panel door.
G. RAIL EXTENSION KIT
Required if your garage door is
more than 7 feet (2.13 m) high.