Preparation - Chamberlain C2102 Installation Manual

Preparation

Check the Door
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
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unbalanced garage door may NOT reverse when required.
NEVER try to loosen, move or adjust garage door, door springs, cables, pulleys, brackets or their
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hardware, ALL of which are under EXTREME tension.
Disable ALL locks and remove ALL ropes connected to garage door BEFORE installation and operating
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garage door opener to avoid entanglement.
DO NOT install on a one-piece door if using devices or features providing unattended close.
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Unattended devices and features are to be used ONLY with sectional doors.
To prevent damage to garage door and opener:
ALWAYS disable locks BEFORE installing and operating the opener.
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ONLY operate garage door opener at 120V, 60 Hz to avoid malfunction and damage.
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Before you begin:
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" (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
Extension
Spring
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