Table Of Contents; Introduction; Safety Symbol And Signal Word Review - Chamberlain LiftMaster Professional Security+ 3850 Owner's Manual

Garage door opener for residential use only
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TABLE OF CONTENTS

Safety symbol and signal word review . . . . . . . . . . . . . .2
Preparing your garage door . . . . . . . . . . . . . . . . . . . . . . .3
Tools needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Carton inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Hardware inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Attach the rail to the motor unit . . . . . . . . . . . . . . . . . . . .6
Set the belt tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Attach the belt cap retainer . . . . . . . . . . . . . . . . . . . . . . .7
Installation safety instructions . . . . . . . . . . . . . . . . . . . . .7
Determine the header bracket location . . . . . . . . . . . . . .8
Install the header bracket . . . . . . . . . . . . . . . . . . . . . . . .9
Attach the rail to the header bracket . . . . . . . . . . . . . . .10
Position the opener . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Hang the opener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Install the control console . . . . . . . . . . . . . . . . . . . . . . .13
Install the battery backup (optional) . . . . . . . . . . . . . . . .14
Install the lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Electrical requirements . . . . . . . . . . . . . . . . . . . . . . . . .15
Fasten the door bracket . . . . . . . . . . . . . . . . . . . . . .19-20
Connect door arm to trolley . . . . . . . . . . . . . . . . . . .21-22

INTRODUCTION

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.
WARNING
CAUTION
WARNING
WARNING
WARNING
CAUTION
(Safety Sensors) . . . . .16-18
®
Mechanical
Electrical
2-5
Program the travel limits . . . . . . . . . . . . . . . . . . . . . . . . .23
Setting the force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Test the safety reversal system . . . . . . . . . . . . . . . . . . .25
Operation safety instructions . . . . . . . . . . . . . . . . . . . . .26
6-7
Using your garage door opener . . . . . . . . . . . . . . . . . . .26
Using the wall-mounted control console . . . . . . . . . . . . .27
To open the door manually . . . . . . . . . . . . . . . . . . . . . . .27
Battery Backup (optional) . . . . . . . . . . . . . . . . . . . . . . . .28
Care of your garage door opener . . . . . . . . . . . . . . . . . .29
7-22
Having a problem? (Troubleshooting) . . . . . . . . . . . . . . .30
Diagnostic chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
3-Button remotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Rail assembly parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Installation parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Motor unit assembly parts . . . . . . . . . . . . . . . . . . . . . . . .35
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.
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.
2
®
(Safety Sensors) . . . . . . . . .25
WARNING
WARNING
WARNING
WARNING
23-25
26-31
32-33
34-35
36
37-39
40
40

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