Chamberlain 248730 User Manual download pdf (Page 2)

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 strictaccordance with the instructions and warnings contained in this

manual.

When you see these SafetySymbols and Signal Words on the following pages,they will alert you to the

possibilityof serious injury or death ifyou 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 thisSignal Word on the following pages,itwill alert you to the possibilityof damage to

your garage door and/or the garage door opener if you do not comply with the cautionary statementsthat

accompany it.Read them carefully.

Check the Door

To prevent possible SERIOUSINJURYor DEATH:

• ALWAYS call a trained door systemstechnician 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 adjustgarage door, door springs,cables, pulleys, bracketsor 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 Hzto avoid malfunction and damage.

1. Disable locks and remove any ropes connected to the garage door.

2. Liftthe door halfway up. Release the door. Ifbalanced, it should stay in

place, supported entirely by its springs.

3. Raise and lower the door to check for binding or sticking. Ifyour door

binds,sticks, or is out ofbalance, 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. Ifthere 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 leftor right of the

door center. See page 13.

Torsion

Spring

Extension

Spring

Preparation

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Chamberlain 248730 User Manual Page 2