Chamberlain HD920EV User Manual

1
Safety Symbol and Signal Word Review
This garage door opener has been designed and tested to offer safe service provided it isinstalled,
operated, maintained and tested in strictaccordance with the instructions and warningscontained in this
manual.
When you see these SafetySymbols and Signal Words on the following pages,they will alertyou to the
possibility of serious injury or death if you do notcomply with the warnings that accompanythem. 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 alertyou to the possibility of damage to
your garage door and/or the garage door opener ifyou do not comply with the cautionary statements that
accompany it. Read them carefully.
Check the Door
To preventpossible 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 mayNOT reverse when required.
• NEVER try to loosen, move or adjustgarage door,door springs,cables,pulleys, brackets or their
hardware, ALLofwhich 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 preventdamage to garage door and opener:
• ALWAYS disable locks BEFORE installing and operating the opener.
• ONLY operate garage door opener at120 V,60 Hzto avoid malfunction and damage.
1. Disable locks and remove anyropes connected to the garage door.
2. Liftthe door halfway up.Release the door. Ifbalanced, it should stay in
place, supported entirely by itssprings.
3. Raise and lower the door to check for binding or sticking. Ifyour 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 bottomof the door mustnotexceed 1/4 inch (6 mm).
Otherwise, the safetyreversal system may notwork properly.
5. The opener should be installed above the center of the door. Ifthere is
a torsion spring or center bearing plate in the way ofthe header
bracket, it may be installed within 4 feet (1.2 m) to the leftor rightof the
door center.See page 12.
Torsion
Spring
Extension
Spring
OR
Preparation

Chamberlain HD920EV Specifications

General

Brand	Chamberlain
Model	HD920EV
Category	Garage Door Opener
Language	English