Chamberlain 3850 User Manual 2

The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196

www.liftmaster.com

GARAGE DOOR OPENER

Model 3850

For Residential Use Only

Owner’s Manual

■ Please read this manual and the enclosed safety materials carefully!

■ Fasten the manual near the garage door after installation.

■ The door WILL NOT CLOSE unless the Protector System

is connected and

properly aligned.

■ Periodic checks of the opener are required to ensure safe operation.

■ The model number label is located under the light lens on the left side

panel of your opener.

Introduction 2-5

Safety symbol and signal word review . . . . . . . . . . . . . .2

Preparing your garage door . . . . . . . . . . . . . . . . . . . . . . .3

Tools needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Carton inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Hardware inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Assembly 6-7

Attach the rail to the motor unit . . . . . . . . . . . . . . . . . . . .6

Set the belt tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Attach the belt cap retainer . . . . . . . . . . . . . . . . . . . . . . .7

Installation 7-22

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

Attach the emergency release rope and handle . . . . . .15

Electrical requirements . . . . . . . . . . . . . . . . . . . . . . . . .15

Install the Protector System

(Safety Sensors) . . . . .16-18

Fasten the door bracket . . . . . . . . . . . . . . . . . . . . . .19-20

Connect door arm to trolley . . . . . . . . . . . . . . . . . . .21-22

Adjustment 23-25

Program the travel limits . . . . . . . . . . . . . . . . . . . . . . . . .23

Setting the force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Test the safety reversal system . . . . . . . . . . . . . . . . . . .25

Test the Protector System

(Safety Sensors) . . . . . . . . .25

Operation 26-32

Operation safety instructions . . . . . . . . . . . . . . . . . . . . .26

Using your garage door opener . . . . . . . . . . . . . . . . . . .26

Using the wall-mounted control console . . . . . . . . . . . . .27

To open the door manually . . . . . . . . . . . . . . . . . . . . . . .28

Battery Backup (optional) . . . . . . . . . . . . . . . . . . . . . . . .29

Care of your garage door opener . . . . . . . . . . . . . . . . . .30

Having a problem? (Troubleshooting) . . . . . . . . . . . . . . .31

Diagnostic chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Programming 33-34

To add or reprogram a hand-held remote control . . . . . .33

To erase all codes from motor unit memory . . . . . . . . . .33

3-Button remotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

To add, reprogram or change a Keyless Entry PIN . . . .34

Repair Parts 35-36

Rail assembly parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Installation parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Motor unit assembly parts . . . . . . . . . . . . . . . . . . . . . . . .36

Accessories 37 Notes 38-39 Repair Parts and Service 40 Warranty 40

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.

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.

Mechanical

Electrical

WARNING

CAUTION

To prevent damage to garage door and opener:

• ALWAYS disable locks BEFORE installing and operating the opener.

• ONLY operate garage door opener at 120V, 60 Hz to avoid malfunction and damage.

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 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 installing and operating garage door opener to avoid entanglement.

Preparing your garage door

Before you begin:

• Disable locks.

• Remove any ropes connected to garage door.

• Complete the following test to make sure your garage door is balanced and is not sticking or binding:

1. Lift the door about halfway as shown. Release the

door. If balanced, it should stay in place, supported entirely by its springs.

2. Raise and lower the door to see if there is any

binding or sticking.

If your door binds, sticks, or is out of balance, call a trained door systems technician.

Tools needed

During assembly, installation and adjustment of the opener, instructions will call for hand tools as illustrated below.

WARNING

Sectional Door

One-Piece Door

WARNING

CAUTION

Carpenter's Level (optional)

Drill

Tape Measure

Drill Bits 3/16", 5/16" and 5/32"

Pencil

Hack Saw

Claw Hammer

Wire Cutters

Screwdriver

Stepladder

Sockets and Wrench 1/2", 5/8", 7/16", 9/16" and 1/4"

Pliers

Adjustable End Wrench

SECTIONAL DOOR INSTALLATION

Planning

Identify the type and height of your garage door. Survey your garage area to see if any of the conditions below apply to your installation. Additional materials may be required. You may find it helpful to refer back to this page and the accompanying illustrations as you proceed with the installation of your opener.

ONE-PIECE DOOR WITHOUT TRACK

ONE-PIECE DOOR WITH TRACK

Horizontal and vertical reinforcement is needed for lightweight garage doors (fiberglass, steel, aluminum, door with glass panels, etc.). See page 19 for details.

Header Wall

— — — — — — — —

Vertical Centerline of Door

Gap between floor and bottom

Safety Reversing Sensor

of door must not exceed 1/4" (6 mm)

Torsion Spring

Safety Reversing Sensor

Extension Spring

FINISHED CEILING

Support bracket & fastening hardware is required. See page 12.

Motor Unit

Access Door

Wallmounted Door Control

Header Wall

Gap between floor and bottom of Safety Reversing Sensor

door must not exceed 1/4" (6 mm)

Wallmounted Door Control

Safety Reversing Sensor

Access Door

FINISHED CEILI

Support

bracket & fastening hard

ware is re

See page 12.

quired.

Safety Reversing Sensor

Motor Unit

Access Door

Safety Reversing Sensor

Gap between floor and bottom of door must not exceed 1/4" (6 mm).

Your garage door opener is packaged in two cartons which contain the motor unit and all parts illustrated below. Accessories will depend on the model purchased.

If anything is missing, carefully check the packing material. Parts may be stuck in the foam. Hardware for installation is also listed below.

Carton Inventory

INSTALLATION HARDWARE

Hex Bolt 5/16"-18x7/8" (4) Hex Screw #8 x 3/8" (2) Lag Screw 5/16"-9x1-5/8" (2) Lag Screw 5/16"-18x1-7/8" (2) Clevis Pin 5/16"x2-3/4" (1) Clevis Pin 5/16"x1-1/4" (1) Clevis Pin 5/16"x1" (1) Nut 5/16"-18 (4) Lock Washer 5/16" (4) Screw 6ABx1-1/4" (2)

Self-Threading Screw 1/4"-14x5/8" (2) Screw 6-32x1" (2) Insulated Staples (30) Ring Fastener (3) Dry Wall Anchors (2) Rope Handle Rail Grease Carriage Bolt 1/4"-20x1/2" (2) Wing Nut 1/4"-20 (2)

IGH

LCD Motion Detecting Door Control Console

2-Conductor Bell Wire White & White/Red

SECURITY✚

3-Button Remote Control

Motor Unit w/Light Lenses

Remote Control Visor Clip

Styrofoam

Battery

(Optional)

Belt

Belt Cap Retainer

One-Piece Rail

Door Bracket

Belt Pulley Bracket

Safety Sensor Bracket (2)

T O

Trolley

Header Bracket

The Protector System

(2) Safety Reversing Sensors (1 Sending Eye and 1 Receiving Eye) with 2-Conductor White & White/Black Bell Wire attached

Curved Door Arm Section

Safety Labels and Literature

Straight Door Arm Section

ASSEMBLY STEP 1

Attach the Rail to the Motor Unit

To avoid installation difficulties, do not run the garage door opener until instructed to do so.

• Remove the two washered bolts mounted on top of motor unit.

• Align rail and styrofoam over belt pulley. Cut tape from rail, chain and styrofoam.

• REMOVE STYROFOAM.

• Insert both washered bolts through the rail into the motor unit. Tighten bolts securely.

Use only these bolts! Use of any other bolts will cause serious damage to door opener.

• Position belt over the motor unit belt pulley.

To avoid SERIOUS damage to opener, ONLY use bolts mounted in top of motor unit.

WARNING

ASSEMBLY STEP 2

Set the Belt Tension

• By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against the trolley (Figure 1). Do not use any tools.

• Insert a screwdriver tip into one of the nut ring slots and brace it firmly against the trolley (Figure 2).

• Place a 7/16" open end wrench on the square end. Rotate about 1/4 turn until the spring releases and snaps the nut ring against the trolley (Figure 3).

This extends the spring for optimum belt tension.

Figure 1

Figure 2

Figure 3

CAUTION

USE ONLY THIS TYPE AND SIZE

BOLT

Washered Bolt 5/16"-18x1/2"

Rail Hole

Motor U Belt Pulley

nit

Trolley

Nut Ring Trolley

Nut Ring

Trolley Threaded Shaft

Spring/Trolley Nut

Square End

Nut Ring

Trolley Threaded Shaft

Nut Ring Slots

BEFORE AFTER RELEASE

1" (2.5 cm) 1-1/4" (3.18 cm)

ASSEMBLY STEP 3

Attach the Belt Cap Retainer

• Position the belt cap retainer over the motor unit belt pulley so the three holes in cap align with the three holes in mounting plate. Attach with #8x3/8" hex screws provided.

You have now finished assembling your garage door opener. Please read the following warnings before proceeding to the installation section.

INSTALLATION

To avoid possible SERIOUS INJURY to fingers from moving garage door opener:

• ALWAYS keep hand clear of belt pulley while operating opener.

• Securely attach belt pulley cover BEFORE operating.

WARNING

HARDWARE SHOWN

ACTUAL SIZE

IMPORTANT INSTALLATION INSTRUCTIONS

To reduce the risk of SEVERE INJURY or DEATH:

WARNING

1. READ AND FOLLOW ALL INSTALLATION WARNINGS AND INSTRUCTIONS.

2. Install garage door opener ONLY on properly balanced and lubricated garage door. An improperly balanced door may not reverse when required and could result in SEVERE INJURY or DEATH.

3. ALL repairs to cables, spring assemblies and other hardware MUST be made by a trained door systems technician BEFORE installing opener.

4. Disable ALL locks and remove ALL ropes connected to garage door BEFORE installing opener to avoid entanglement.

5. Install garage door opener 7 feet (2.1 m) or more above floor.

6. Mount emergency release handle 6 feet (1.8 m) above floor.

7. NEVER connect garage door opener to power source until instructed to do so.

8. NEVER wear watches, rings or loose clothing while installing or servicing opener. They could be caught in garage door or opener mechanisms.

9. Install wall-mounted garage control console:

• within sight of the garage door.

• out of reach of children at minimum height of 5 feet (1.5 m).

• away from ALL moving parts of the door.

10. Place entrapment warning label on wall next to garage control console.

11. Place manual release/safety reverse test label in plain view on inside of garage door.

12. Upon completion of installation, test safety reversal system. Door MUST reverse on contact with a 1-1/2" (3.8 cm) high object (or a 2x4 laid flat) on the floor.

13. To avoid SERIOUS PERSONAL INJURY or DEATH from electrocution, disconnect ALL electric and battery power BEFORE performing ANY service or maintenance.

WARNING

8x3/8" Hex Screws

Hex Screw #8x3/8"

Belt Cap Retainer

Motor Unit Belt Pulley

Mounting Plate

WARNING

INSTALLATION STEP 1

Determine the Header Bracket Location

Installation procedures vary according to garage door types. Follow the instructions which apply to your door.

1. Close the door and mark the inside vertical centerline of the garage door.

2. Extend the line onto the header wall above the door.

You can fasten the header bracket within 4 feet (1.22 m) of the left or right of the door center only if a torsion spring or center bearing plate is in the way; or you can attach it to the ceiling (see page 9) when clearance is minimal. (It may be mounted on the wall upside down if necessary, to gain approximately 1/2" (1 cm).)

If you need to install the header bracket on a 2x4 (on wall or ceiling), use lag screws (not provided) to securely fasten the 2x4 to structural supports as shown here and on page 9.

3. Open your door to the highest point of travel as shown. Draw an intersecting horizontal line on the header wall above the high point:

• 2" (5 cm) above the high point for sectional door and one-piece door with track.

• 8" (20 cm) above the high point for one-piece door without track.

This height will provide travel clearance for the top edge of the door.

NOTE: If the total number of inches exceeds the height available in your garage, use the maximum height possible, or refer to page 9 for ceiling installation.

To prevent possible SERIOUS INJURY or DEATH:

• Header bracket MUST be RIGIDLY fastened to structural support on header wall or ceiling, otherwise garage door might not reverse when required. DO NOT install header bracket over drywall.

• Concrete anchors MUST be used if mounting header bracket or 2x4 into masonry.

• NEVER try to loosen, move or adjust garage door, springs, cables, pulleys, brackets, or their hardware, ALL of which are under EXTREME tension.

• ALWAYS call a trained door systems technician if garage door binds, sticks, or is out of balance. An unbalanced garage door might not reverse when required.

WARNING

Header Wall

2" (5 cm)

Highest Point of Travel

Door

Sectional door with curved track

Header Wall

Door

Jamb Hardware

8" (20 cm)

Highest Point of Travel

Track

Unfinished Ceiling

2x4

Vertical Centerline of Garage Door

2x4

Level (optional)

Header Wall

Door

One-piece door with horizontal track

Header Wall

8" (20 cm)

Door

OPTIONAL CEILING MOUNT FOR HEADER BRACKET

Structural Supports

2" (5 cm)

Highest Point of Travel

Track

One-piece door without track: jamb hardware

One-piece door without track: pivot hardware

Pivot

INSTALLATION STEP 2

Install the Header Bracket

You can attach the header bracket either to the wall above the garage door, or to the ceiling. Follow the instructions which will work best for your particular requirements. Do not install the header bracket over

drywall. If installing into masonry, use concrete anchors (not provided).

WALL HEADER BRACKET INSTALLATION

• Center the bracket on the vertical centerline with the bottom edge of the bracket on the horizontal line as shown (with the arrow pointing toward the ceiling).

• Mark the vertical set of bracket holes (do not use the holes designated for ceiling mount). Drill 3/16" pilot holes and fasten the bracket securely to a structural support with the hardware provided.

HARDWARE SHOWN ACTUAL SIZE

CEILING MOUNT ONLY

Ceiling Mounting Holes

The nail hole is for positioning only. You must use lag screws to mount the header bracket.

Lag Screws 5/16"-9x1-5/8"

Garage Door

Vertical Centerline of Garage Door

Header Wall

– Finished Ceiling –

Header Bracket

6" (15 cm) Maximum

Vertical Centerline of Garage Door

Door Spring

CEILING HEADER BRACKET INSTALLATION

• Extend the vertical centerline onto the ceiling as shown.

• Center the bracket on the vertical mark, no more than 6" (15 cm) from the wall. Make sure the arrow is pointing toward the wall. The bracket can be mounted flush against the ceiling when clearance is minimal.

• Mark the side holes. Drill 3/16" pilot holes and fasten bracket securely to a structural support with the hardware provided.

Wall Mounting Holes

Lag Screw 5/16"-9x1-5/8"

CEILING MOUNT ONLY

Optional Wall Mounting Holes

Header Wall

2x4 Structural Support

Horizontal Line

Highest Point of Garage Door Travel

Header

Bracket

The nail hole is for positioning only. You must use lag screws to mount the header bracket.

Vertical Centerline of Garage Door

T O

Door Spring

Garage Door

Vertical Centerline of Garage Door

Lag Screws 5/16"-9x1-5/8"

Header Wall

HARDWARE SHOWN ACTUAL SIZE

INSTALLATION STEP 3

Attach the Rail to the Header Bracket

• Position the opener on the garage floor below the header bracket. Use packing material as a protective base. NOTE: If the door spring is in the way you’ll

need help. Have someone hold the opener securely on a temporary support to allow the rail to clear the spring.

• Position the rail bracket against the header bracket.

• Align the bracket holes and join with a clevis pin as shown.

• Insert a ring fastener to secure.

Header Bracket

Belt Pulley Bracket

Ring

Header Bracket

Fastener

Garage Door

Clevis Pin 5/16"x2-3/4"

Belt Pulley Bracket

Rail

Temporary Support

Clevis Pin 5/16"x2-3/4"

Ring Fastener

ONE-PIECE DOOR WITHOUT TRACK

• With the door fully open and parallel to the floor, measure the distance from the floor to the top of the door.

• Using a stepladder as a support, raise the top of the opener to this height.

• The top of the door should be level with the top of the motor unit. Do not position the opener more than 4" (10 cm) above this point.

INSTALLATION STEP 4

Position the Opener

Follow instructions which apply to your door type as illustrated.

SECTIONAL DOOR OR ONE-PIECE DOOR WITH TRACK

A 2x4 laid flat is convenient for setting an ideal door-to-rail distance.

• Raise the opener onto a stepladder. You will need help at this point if the ladder is not tall enough.

• Open the door all the way and place a 2x4 laid flat on the top section beneath the rail.

• If the top section or panel hits the trolley when you raise the door, pull down on the trolley release arm to disconnect inner and outer sections. Slide the outer trolley toward the motor unit. The trolley can remain disconnected until Installation Step 12 is completed.

To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top section of door.

WARNING

CAUTION

Rail

Door

2x4 is used to determine the correct mounting height from ceiling.

Trolley Release Arm

ENGAGED

RELEASED

Header Bracket

Top of Door

Top of Motor Unit

2x4 is used to determine the correct mounting height from ceiling.

INSTALLATION STEP 5

Hang the Opener

Three representative installations are shown. Yours may be different. Hanging brackets should be angled (Figure 1) to provide rigid support. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural supports before installing the opener. This bracket and fastening hardware are not provided.

1. Remove foam packaging. Measure the distance from each side of the motor unit to the structural support.

2. Cut both pieces of the hanging bracket to required lengths.

3. Drill 3/16" pilot holes in the structural supports.

4. Attach one end of each bracket to a support with 5/16"-18x1-7/8" lag screws.

5. Fasten the opener to the hanging brackets with 5/16"-18x7/8" hex bolts, lock washers and nuts.

6. Check to make sure the rail is centered over the door (or in line with the header bracket if the bracket is not centered above the door).

7. Remove the 2x4. Operate the door manually. If the door hits the rail, raise the header bracket.

8. Grease the top and underside of the rail surface where the trolley slides with rail grease.

NOTE: DO NOT connect power to opener at this time.

To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to structural supports of the garage. Concrete anchors MUST be used if installing ANY brackets into masonry.

HARDWARE SHOWN ACTUAL SIZE

Figure 1

Figure 2

Figure 3

WARNING

Structural

Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

Bracket (Not Provided)

Measure Distance

Hidden Support

— FINISHED CEILING —

Lag Screws 5/16"-18x1-7/8"

Supports

Lag Screws 5/16"-18x1-7/8"

Lag Screw 5/16"-9x1-5/8"

Hex Bolt 5/16"-18x7/8"

Nut 5/16"-18

Lock Washer 5/16"

Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

Lag Screws 5/16"-18x1-7/8"

Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

(Not Provided) Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

FINISHED CEILING

(Not Provided) Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

+ 28 hidden pages

Chamberlain 3850 User Manual 2

Owner’s Manual

TABLE OF CONTENTS

INTRODUCTION

Safety Symbol and Signal Word Review

Preparing your garage door

Tools needed

Planning

Carton Inventory

INSTALLATION HARDWARE

INSTALLATION