Preparation - Chamberlain HD920EV Manual

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.
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.
Check the Door
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 floor 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 page 13.
Torsion Spring
OR
Extension Spring
To prevent possible SERIOUS NJURY 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
installation and operating garage door
opener to avoid entanglement.
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.
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