Chamberlain 3885C User Manual

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

www.liftmaster.com

GARAGE DOOR OPENER

Model 3885C 3/4HP

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 light ...........................................................14

Attach the emergency release rope and handle .......14

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

Install the Protector System®................................16-18

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

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

Adjustment 23-25

Adjust the travel limits ...............................................23

Adjust the force .........................................................24

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

Test the Protector System®........................................25

Operation 26-31

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

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

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

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

Care of your opener ..................................................29

Having a problem? ....................................................30

Diagnostic chart.........................................................31

Programming 32-33

To add or reprogram a hand-held remote control .....32

To erase all codes from motor unit memory..............32

3-Button remotes.......................................................32

To add, reprogram or change

a Keyless Entry PIN ..................................................33

Repair Parts 34-35

Rail assembly parts...................................................34

Installation parts ........................................................34

Motor unit assembly parts .........................................35

Accessories 36 Notes 37-39 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

ONE-PIECE DOOR WITHOUT TRACK

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 WITH TRACK

SECTIONAL DOOR INSTALLATION

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 Garage Door

Gap between floor and bottom of door must not

Safety Reversing Sensor

exceed 1/4" (6 mm)

Extension

Torsion Spring

Safety Reversing Sensor

Spring

One-Piece Door-Extension Spring

Door

FINISHED CEILING

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

Header Wall

Track

Access Door

Motor Unit

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.

Motor Unit

Gap between floor

Safety Reversing Sensor

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

Access Door

Safety Reversing Sensor

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) Drywall Anchors (2) Rope Handle Rail Grease Carriage Bolt 1/4"-20x1/2" (2) Wing Nut 1/4”-20 (2)

LOCK

LIGHT

Motion Detecting Door Control Console (LCD)

2-Conductor Bell Wire White & White/Red

Belt Pulley Bracket

SECURITY✚

3-Button Remote Control

Motor Unit w/Light Lenses

Trolley

Belt Cap Retainer

Remote Control Transmitter Visor Clip

Styrofoam

Belt

One-Piece Rail

T O

Header Bracket

Door Bracket

Curved Door Arm Section

Safety Sensor Bracket (2)

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

Safety Labels and Literature

Straight Door Arm Section

To avoid SERIOUS damage to opener, ONLY use bolts/fasteners 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

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 bolt and lock nut from the top of the motor unit.

• Place rail onto the bolt mounted on the motor unit and align the back hole with the hole in the top of the unit.

• Fasten rail with the washered bolt and lock nut previously removed. Tighten securely. Remember

to use only these bolts/fasteners! Any other bolts/fasteners will cause serious damage to the opener.

• Cut tape from rail, belt and styrofoam.

• REMOVE STYROFOAM.

• Position belt over the motor unit sprocket.

USE ONLY THIS TYPE AND SIZE

BOLT

CAUTION

Washered Bolt

Lock Nut

Rail Hole

Motor unit Sprocket

5/16"-18x1/2"

Styrofoam

Trolley

Nut Ring Trolley

BEFORE AFTER RELEASE

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

Nut Ring

Spring/Trolley Nut

Trolley Threaded Shaft

Square End

Nut Ring

Trolley Threaded Shaft

Nut Ring Slots

INSTALLATION

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 (2.13 m) or more above floor.

6. Mount emergency release handle 6 feet (1.83 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 door control:

• 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 door control.

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.

ASSEMBLY STEP 3

Attach the Belt Cap Retainer

• Position the belt cap retainer over the motor unit sprocket so the two holes in cap align with the two 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.

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

• ALWAYS keep hand clear of sprocket while operating opener.

• Securely attach sprocket cover BEFORE operating.

WARNING

HARDWARE SHOWN

ACTUAL SIZE

Hex Screw #8x3/8"

WARNING

Hex Screws 8x3/8"

Belt Cap Retainer

Motor Unit Sprocket

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

Unfinished Ceiling

Header Wall

Vertical Centerline of Garage Door

Level (optional)

Header Wall

2" (5 cm)

Door

One-piece door with horizontal track

Header Wall

8" (20 cm)

Door

Jamb Hardware

Track

Highest Point of Travel

OPTIONAL CEILING MOUNT FOR HEADER

2x4

Sectional door with curved track

Door

BRACKET

2x4

Header Wall

2" (5 cm)

Highest Point of Travel

Door

Header Wall

8" (20 cm)

Structural Supports

Highest Point of Travel

Pivot

Track

One-piece door without track: jamb hardware

One-piece door without track: pivot hardware

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

CEILING MOUNT ONLY

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

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

Optional Wall Mounting Holes

Header Wall

2x4 Structural Support

Horizontal Line

Highest Point of Garage Door Travel

Header Bracket

IN L I

E C

T O

Vertical Centerline of Garage Door

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

Door Spring

Garage Door

Header Wall

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.

HARDWARE SHOWN ACTUAL SIZE

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

A 2x4 on its side is convenient for setting an ideal door-to-rail distance.

• Remove foam packaging.

• 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 on its side on the top section of the door beneath the rail.

• 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.

• Remove foam packaging.

• 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. 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

WARNING

Figure 3

WARNING

Structural Supports

Measure Distance

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

Bracket (Not Provided)

Hidden Support

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

FINISHED CEILING

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

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

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

INSTALLATION STEP 6

Install the Control Console

Locate control console within sight of door, at a minimum height of 5' (1.5 m) where small children cannot reach, away from moving parts of door and door hardware. If installing into drywall, drill 5/32" holes and use the anchors provided. For pre-wired installations (as in new home construction), it may be mounted to a single gang box (Figure 1).

CAUTION: Continuous exposure of the control console to temperatures below -22° F (-30° C) may damage the LCD screen.

NOTE: The functional temperature range of the control console is between -20° C (-4° F) and 50° C (122° F). Scroll speed of display is slower at lower temperatures although the control console remains fully functional.

SPECIAL NOTE: Only one 398LM can be connected to each garage door opener. If additional wall controls are desired to operate the same garage door opener, it is recommended to use model 378LM wireless wall control as the secondary control console.

1. Strip 7/16" (11 mm) of insulation from one end of bell wire and connect to the two screw terminals on back of control console by color: white wire to the white (2) and white/red wire to the red (1) (Figure 2).

2. Remove push bar cover by gently prying at the lower/middle portion of the cover with a small flat-head screwdriver. Fasten with 6AB x 1-1/4" self-tapping screws (drywall installation) or 6-32 x 1" machine screws (into gang box) as follows:

• Install bottom screw, allowing 1/8" (3 mm) to

protrude above wall surface.

• Position bottom of control console on screw head

and slide down to secure. Adjust screw for snug fit.

• Drill and install top screw with care to avoid

cracking plastic housing. Do NOT overtighten.

• Replace cover by inserting top tabs first and then

snap cover in place.

3. (For standard installations ONLY) Run bell wire up wall and across ceiling to motor unit. Use insulated staples to secure wire in several places. Do NOT pierce wire with a staple, creating a short or open circuit.

4. Strip 7/16" (11 mm) of insulation from end of bell wire. Connect bell wire to the quick-connect terminals on the motor unit: white to white and white/red to red (Figure 3).

NOTE: If you have any trouble with the operation of the buttons, loosen the top mounting screw.

NOTE: DO NOT connect the power and operate the opener at this time. The trolley will travel to the full open position but will not return to the close position until the sensor beam is connected and properly aligned. See Safety Reversing Sensor Instructions beginning on page 16.

HARDWARE SHOWN ACTUAL SIZE

To prevent possible SERIOUS INJURY or DEATH from electrocution:

• Be sure power is not connected BEFORE installing door control.

• Connect ONLY to 24 VOLT low voltage wires.

To prevent possible SERIOUS INJURY or DEATH from a closing garage door:

• Install door control within sight of garage door, out of reach of children at a minimum height of 5 feet (1.5 m) and away from ALL moving parts of door.

• NEVER permit children to operate or play with door control push buttons or remote control transmitters.

• Activate door ONLY when it can be seen clearly, is properly adjusted and there are no obstructions to door travel.

• ALWAYS keep garage door in sight until completely closed. NEVER permit anyone to cross path of closing garage door.

WARNING

Figure 1

Figure 3

Figure 2

WARNING

Screw 6ABx1-1/4" (std installation)

Screw 6-32x1" (pre-wired)

STANDARD WALL MOUNT

To Replace Insert Top Ta bs First

Push Bar Cover

LOCK

2-Conductor Bell Wire

R 1

(BACK VIEW)

GHT

ON OFF

Detector Switch

Top Mounting Hole

Door Control Terminal Screws

Bottom Mounting Hole

To Replace Insert Top Ta bs First

Push Bar Cover

Door Control Connections

Strip wire 7/16" (11 mm)

Drywall Anchors

PRE-WIRED INSTALLATION

24 Volt Bell Wire

To release wire, push in tab with screwdriver tip

White

Red

Grey

7/16" (11 mm)

Insulated Staples

Detector

Switch

ON OFF

INSTALLATION STEP 7

Install the Light

• Press the release tabs on both sides of lens. Gently rotate lens back and downward until the lens hinge is in the fully open position. Do not remove the lens.

• Install a 100 watt maximum light bulb in each socket. Light bulb size should be A19, standard neck only. The lights will turn ON and remain lit for approximately 4-1/2 minutes when power is connected. Then the lights will turn OFF.

• Reverse the procedure to close the lens.

• Use A19, standard neck garage door opener bulbs for replacement.

NOTE: Use only standard light bulbs. The use of short neck or speciality light bulbs may overheat the endpanel or light socket.

INSTALLATION STEP 8

Attach the Emergency Release Rope and Handle

• Thread one end of the rope through the hole in the top of the red handle so “NOTICE” reads right side up as shown. Secure with an overhand knot at least 1" (2.5 cm) from the end of the rope to prevent slipping.

• Thread the other end of the rope through the hole in the release arm of the outer trolley.

• Adjust rope length so the handle is 6 feet (1.83 m) above the floor. Ensure that the rope and handle clear the tops of all vehicles to avoid entanglement. Secure with an overhand knot.

NOTE: If it is necessary to cut the rope, heat seal the cut end with a match or lighter to prevent unraveling.

To prevent possible OVERHEATING of the endpanel or light socket:

• DO NOT use short neck or specialty light bulbs.

• DO NOT use halogen bulbs. Use ONLY incandescent. To prevent damage to the opener:

• DO NOT use bulbs larger than 100W.

• ONLY use A19 size bulbs.

WARNING

To prevent possible SERIOUS INJURY or DEATH from a falling garage door:

• If possible, use emergency release handle to disengage trolley ONLY when garage door is CLOSED. Weak or broken springs or unbalanced door could result in an open door falling rapidly and/or unexpectedly.

• NEVER use emergency release handle unless garage doorway is clear of persons and obstructions.

• NEVER use handle to pull door open or closed. If rope knot becomes untied, you could fall.

WARNING

CAUTION

100 Watt (Max) Standard Light Bulb

Release Tab

Lens

100 Watt (Max) Standard Light Bulb

Hinge

WARNING

Overhand Knot

Trolley

Emergency Release Handle

Overhand Knot

NOTICE

Rope

Release Arm

INSTALLATION STEP 9

Electrical Requirements

To avoid installation difficulties, do not run the opener at this time.

To reduce the risk of electric shock, your garage door opener has a grounding type plug with a third grounding pin. This plug will only fit into a grounding type outlet. If the plug doesn’t fit into the outlet you have, contact a qualified electrician to install the proper outlet.

If permanent wiring is required by your local code, refer to the following procedure.

To make a permanent connection through the 7/8" hole in the top of the motor unit:

• Remove the motor unit cover screws and set the cover aside.

• Remove the attached 3-prong cord.

• Connect the black (line) wire to the screw on the brass terminal; the white (neutral) wire to the screw on the silver terminal; and the ground wire to the green ground screw. The opener must be

grounded.

• Reinstall the cover.

To avoid installation difficulties, do not run the opener at this time.

To prevent possible SERIOUS INJURY or DEATH from electrocution or fire:

• Be sure power is not connected to the opener and disconnect power to circuit BEFORE removing cover to establish permanent wiring connection.

• Garage door installation and wiring MUST be in compliance with ALL local electrical and building codes.

• NEVER use an extension cord, 2-wire adapter or change plug in ANY way to make it fit outlet. Be sure the opener is grounded.

RIGHT

WRONG

WARNING

PERMANENT WIRING CONNECTION

Green Ground Screw

Ground Wire

Ground Tab

White Wire

Black Wire

Facing the door from inside the garage

INSTALLATION STEP 10

Install The Protector System

The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction.

IMPORTANT INFORMATION ABOUT THE SAFETY REVERSING SENSOR

When properly connected and aligned, the sensor will detect an obstacle in the path of its electronic beam. The sending eye (with an amber indicator light) transmits an invisible light beam to the receiving eye (with a green indicator light). If an obstruction breaks the light beam while the door is closing, the door will stop and reverse to full open position, and the opener lights will flash 10 times.

The units must be installed inside the garage so that the sending and receiving eyes face each other across the door, no more than 6" (15 cm) above the floor. Either can be installed on the left or right of the door as long as the sun never shines directly into the receiving eye lens.

The mounting brackets are designed to clip onto the track of sectional garage doors without additional hardware.

If it is necessary to mount the units on the wall, the brackets must be securely fastened to a solid surface such as the wall framing. Extension brackets (see accessories) are available if needed. If installing in masonry construction, add a piece of wood at each location to avoid drilling extra holes in masonry if repositioning is necessary.

The invisible light beam path must be unobstructed. No part of the garage door (or door tracks, springs, hinges, rollers or other hardware) may interrupt the beam while the door is closing.

Be sure power is not connected to the garage door opener BEFORE installing the safety reversing sensor.

To prevent SERIOUS INJURY or DEATH from a closing garage door:

• Correctly connect and align the safety reversing sensor. This required safety device MUST NOT be disabled.

• Install the safety reversing sensor so beam is NO HIGHER than 6" (15 cm) above garage floor.

WARNING

Safety Reversing Sensor 6" (15 cm) max. above floor

Invisible Light Beam Protection Area

Safety Reversing Sensor 6" (15 cm) max. above floor

INSTALLING THE BRACKETS Be sure power to the opener is disconnected.

Install and align the brackets so the sensors will face each other across the garage door, with the beam no higher than 6" (15 cm) above the floor. They may be installed in one of three ways, as follows.

Garage door track installation (preferred):

• Slip the curved arms over the rounded edge of each door track, with the curved arms facing the door. Snap into place against the side of the track. It should lie flush, with the lip hugging the back edge of the track, as shown in Figure 1.

If your door track will not support the bracket securely, wall installation is recommended.

Wall installation (Figure 2 & 3):

• Place the bracket against the wall with curved arms facing the door. Be sure there is enough clearance for the sensor beam to be unobstructed.

• If additional depth is needed, an extension bracket (see accessories) or wood blocks can be used.

• Use bracket mounting holes as a template to locate and drill (2) 3/16" diameter pilot holes on the wall at each side of the door, no higher than 6" (15 cm) above the floor.

• Attach brackets to wall with lag screws (Not provided).

• If using extension brackets or wood blocks, adjust right and left assemblies to the same distance out from the mounting surface. Make sure all door hardware obstructions are cleared.

Floor installation (Figure 4):

• Use wood blocks or extension brackets (see Accessories) to elevate sensor brackets so the lenses will be no higher than 6" (15 cm) above the floor.

• Carefully measure and place right and left assemblies at the same distance out from the wall. Be sure all door hardware obstructions are cleared.

• Fasten to the floor with concrete anchors as shown.

HARDWARE SHOWN ACTUAL SIZE

Figure 1

Figure 2

Figure 3

(Provided with Extension Bracket)

DOOR TRACK MOUNT (RIGHT SIDE)

Door Track

Lip

Sensor Bracket

WALL MOUNT (RIGHT SIDE)

Fasten Wood Block to Wall with Lag Screws (Not Provided)

WALL MOUNT (RIGHT SIDE)

Extension Bracket (See Accessories)

Lens

Inside

arage

Inside

arage

Indicator Light

Lens

Indicator Light

Lens

(Provided with Extension Bracket)

Indicator Light

Sensor Bracket

Lag Screws (Not Provided)

Sensor Bracket

Carriage Bolt

1/4"-20x1/2"

Wing Nut 1/4"-20

Staples

Figure 4

Inside

arage

FLOOR MOUNT (RIGHT SIDE)

Attach with Concrete Anchors (Not Provided)

Lens

Indicator Light

Sensor Bracket

Figure 5MOUNTING AND WIRING THE SAFETY

REVERSING SENSORS

• Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. Use wing nuts to fasten sensors to brackets, with lenses pointing toward each other across the door. Be sure the lens is not obstructed by a bracket extension (Figure 5).

• Finger tighten the wing nuts.

• Run the wires from both sensors to the opener. Use insulated staples to secure wire to wall and ceiling.

• Strip 7/16" (11 mm) of insulation from each set of wires. Separate white and white/black wires sufficiently to connect to the opener quick-connect terminals. Twist like colored wires together. Insert wires into quick-connect holes: white to white and white/black to grey (Figure 6).

ALIGNING THE SAFETY REVERSING SENSORS

• Plug in the opener. The indicator lights in both the

sending and receiving eyes will glow steadily if wiring connections and alignment are correct.

The sending eye amber indicator light will glow regardless of alignment or obstruction. If the green indicator light in the receiving eye is off, dim, or flickering (and the invisible light beam path is not obstructed), alignment is required.

• Loosen the sending eye wing nut and readjust, aiming directly at the receiving eye. Lock in place.

• Loosen the receiving eye wing nut and adjust sensor until it receives the sender’s beam. When the green indicator light glows steadily, tighten the wing nut.

TROUBLESHOOTING THE SAFETY REVERSING SENSORS

1. If the sending eye indicator light does not glow steadily after installation, check for:

• Electric power to the opener.

• A short in the white or white/black wires. These can occur at staples, or at opener connections.

• Incorrect wiring between sensors and opener.

• A broken wire.

2. If the sending eye indicator light glows steadily but the receiving eye indicator light doesn’t:

• Check alignment.

• Check for an open wire to the receiving eye.

3. If the receiving eye indicator light is dim, realign either sensor.

NOTE: When the invisible beam path is obstructed or misaligned while the door is closing, the door will reverse. If the door is already open, it will not close. The opener lights will blink 10 times. See page 16.

Figure 6

Wing Nut 1/4"-20

Carriage Bolt 1/4"-20x1/2"

Lens

Connect Wire to Opener Quick-Connect Terminals

Bell Wire

Safety Reversing Sensor

Finished Ceiling

Invisible Light Beam Protection Area

Bell Wire

Safety Reversing Sensor

1. Strip wire 7/16" (11 mm)

2. Twist like colored wires together

3. Insert into appropriate terminals

Red

Quick-Connect Terminals

White

7/16" (11 mm)

Grey

Fiberglass, aluminum or lightweight steel garage doors will require reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit.

WARNING

INSTALLATION STEP 11

Fasten the Door Bracket

Follow instructions which apply to your door type as illustrated below or on the following page.

A horizontal reinforcement brace should be long enough to be secured to two or three vertical supports. A vertical reinforcement brace should cover the height of the top panel.

Figure 1 shows one piece of angle iron as the horizontal brace. For the vertical brace, 2 pieces of angle iron are used to create a U-shaped support. The best solution is to check with your garage door manufacturer for an opener installation door reinforcement kit.

NOTE: Many door reinforcement kits provide for direct attachment of the clevis pin and door arm. In this case you will not need the door bracket; proceed to Step 12.

SECTIONAL DOORS

1. Center the door bracket on the previously marked vertical centerline used for the header bracket installation. Note correct UP placement, as stamped inside the bracket.

2. Position the top edge of the bracket 2"-4" (5-10 cm) below the top edge of the door, OR directly below any structural support across the top of the door.

3. Mark, drill holes and install as follows, depending on your door’s construction:

Metal or light weight doors using a vertical angle iron brace between the door panel support and the door bracket:

• Drill 3/16" fastening holes. Secure the door bracket using the two 1/4"-14x5/8" self-threading screws (Figure 2A).

• Alternately, use two 5/16" bolts, lock washers and nuts (not provided) (Figure 2B).

Metal, insulated or light weight factory reinforced doors:

• Drill 3/16" fastening holes. Secure the door bracket using the self-threading screws (Figure 3).

Wood Doors:

• Use top and bottom or side to side door bracket holes. Drill 5/16" holes through the door and secure bracket with 5/16"x2" carriage bolts, lock washers and nuts (not provided) (Figure 4).

NOTE: The 1/4"-14x5/8" self-threading screws are not intended for use on wood doors.

Figure 1

Figure 2A

Figure 3

Figure 4

Figure 2B

HARDWARE SHOWN ACTUAL SIZE

Self-Threading Screw 1/4"-14x5/8"

CAUTION

Header Bracket

Door Bracket Location

HORIZONTAL AND VERTICAL REINFORCEMENT IS NEEDED FOR LIGHTWEIGHT GARAGE DOORS (FIBERGLASS, ALUMINUM, STEEL, DOORS WITH GLASS PANEL, ETC.). (NOT PROVIDED)

Vertical Reinforcement

Vertical Centerline of Garage Door

Bolt 5/16"-18x2"

Door Bracket

Lock Washer 5/16"

(Not Provided)

Bolt 5/16"x2"

Vertical Centerline of Garage Door

Nut 5/16"-18

Inside Edge of Door or Reinforcement Board

Vertical Reinforcement

Vertical Centerline of Garage Door

Door Bracket

Self-Threading Screw 1/4"-14x5/8"

Vertical Centerline of Garage Door

(Not Provided)

Vertical Centerline of Garage Door

Self-Threading Screw 1/4"-14x5/8"

ONE-PIECE DOORS

Please read and comply with the warnings and reinforcement instructions on the previous page. They apply to one-piece doors also.

• Center the door bracket on the top of the door, in line with the header bracket as shown. Mark either the left and right, or the top and bottom holes.

• Metal Doors: Drill 3/16" pilot holes and fasten the bracket with the 1/4"-14x5/8" self-threading screws provided.

• Wood Doors: Drill 5/16" holes and use 5/16"x2" carriage bolts, lock washers and nuts (not provided) or 5/16"x1-1/2" lag screws (not provided) depending on your installation needs.

NOTE: The door bracket may be installed on the top edge of the door if required for your installation. (Refer to the dotted line optional placement drawing.)

HARDWARE SHOWN

ACTUAL SIZE

Header Wall

2x4 Support

Header Bracket

Door Bracket

Optional Placement of Door Bracket

Vertical Centerline of Garage Door

Finished Ceiling

HORIZONTAL AND VERTICAL REINFORCEMENT IS NEEDED FOR LIGHTWEIGHT GARAGE DOORS (FIBERGLASS, ALUMINUM, STEEL, DOORS WITH GLASS PANEL, ETC.). (NOT PROVIDED)

Self-Threading Screw 1/4"-14x5/8"

Door Bracket

Nut 5/16"-18

Door Bracket

Self-Threading Screw 1/4"-14x5/8"

Top of Door (Inside Garage)

Top Edge of Door

Optional Placement

METAL DOOR

Lock Washer 5/16"

Top of Door (Inside Garage)

Top Edge of Door

For a door with no exposed framing, or for the optional installation, use lag screws 5/16"x1-1/2" (Not Provided) to fasten door bracket.

Optional Placement

Carriage Bolt 5/16"x2" (Not Provided)

WOOD DOOR

INSTALLATION STEP 12

Connect the Door Arm to the Trolley

Follow instructions which apply to your door type as illustrated below and on the following page.

SECTIONAL DOORS ONLY

• Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley back (away from the door) about 2" (5 cm) as shown in Figures 1, 2 and 3.

• Figure 1:

– Fasten straight door arm section to outer trolley

with the 5/16"x1" clevis pin. Secure the connection with a ring fastener.

– Fasten curved section to the door bracket in the

same way, using the 5/16"x1-1/4" clevis pin.

• Figure 2:

– Bring arm sections together. Find two pairs of

holes that line up and join sections. Select holes as far apart as possible to increase door arm rigidity.

• Figure 3, Hole alignment alternative:

– If holes in curved arm are above holes in straight

arm, disconnect straight arm. Cut about 6" (15 cm) from the solid end. Reconnect to trolley

with cut end down as shown. – Bring arm sections together. – Find two pairs of holes that line up and join with

bolts, lock washers and nuts.

• Pull the emergency release handle toward the opener at a 45° angle so that the trolley release arm is horizontal. Proceed to Adjustment Step 1, page 23. Trolley will re-engage automatically when opener is operated.

Figure 1

Figure 2

Figure 3

HARDWARE SHOWN ACTUAL SIZE

Inner Trolley

Nuts 5/16"-18

Door Bracket

Outer Trolley

Ring Fastener

Door Bracket

Clevis Pin 5/16"x1-1/4"

Lock Washers 5/16"

Clevis Pin 5/16"x1"

Straight Door Arm

Curved Door Arm

Emergency Release Handle

Bolts 5/16"-18x7/8"

Nut 5/16"-18

Clevis Pin 5/16"x1" (Trolley)

Lock Washer 5/16"

Clevis Pin 5/16"x1-1/4" (Door Bracket)

Ring Fastener

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

Lock Washers 5/16"

Nuts 5/16"-18

Bolts 5/16"-18x7/8"

Cut This End

ALL ONE-PIECE DOORS

1. Assemble the door arm, Figure 4:

• Fasten the straight and curved door arm sections together to the longest possible length (with a 2 or 3 hole overlap).

• With the door closed, connect the straight door arm section to the door bracket with the 5/16"x1-1/4" clevis pin.

• Secure with a ring fastener.

2. Adjustment procedures, Figure 5:

• On one-piece doors, before connecting the door arm to the trolley, the travel limits must be adjusted. Limit adjustment screws are located on the left side panel as shown on page 23. Follow adjustment procedures below.

• Open door adjustment: decrease UP travel limit

- Turn the UP limit adjustment screw

counter-clockwise 4 turns.

- Press the Door Control push button. The trolley

will travel to the fully open position.

- Manually raise the door to the open position

(parallel to the floor), and lift the door arm to the trolley. The arm should touch the trolley just in back of the door arm connector hole. Refer to the fully open trolley/door arm positions in the illustration. If the arm does not extend far enough, adjust the limit further. One full turn equals 3" (7.5 cm) of trolley travel.

• Closed door adjustment: decrease DOWN travel limit

- Turn the DOWN limit adjustment screw

clockwise 4 complete turns.

- Press the Door Control push button. The trolley will travel to the fully closed position.

- Manually close the door and lift the door arm to the trolley. The arm should touch the trolley just ahead of the door arm connector hole. Refer to the fully closed trolley/door arm positions in the illustration. If the arm is behind the connector hole, adjust the limit further. One full turn equals 3" (7.5 cm) of trolley travel.

3. Connect the door arm to the trolley:

• Close the door and join the curved arm to the connector hole in the trolley with the remaining clevis pin. It may be necessary to lift the door slightly to make the connection.

• Secure with a ring fastener.

• Run the opener through a complete travel cycle. If the door has a slight “backward” slant in full open position as shown in the illustration, decrease the UP limit until the door is parallel to the floor.

NOTE: When setting the up limit on the following page, the door should not have a “backward” slant when fully open as illustrated below. A slight backward slant will cause unnecessary bucking and/or jerking operation as the door is being opened or closed from the fully open position.

Figure 4

Figure 5

Door Bracket

Clevis Pin 5/16"x1-1/4"

Straight Arm

Bolts 5/16"-18x7/8

Ring Fastener

Lock Washers 5/16"

Nuts 5/16"-18

Curved Door Arm

Door Arm

Closed Door

Inner Trolley

Door Arm Connector Hole

Inner Trolley

Open Door

Outer Trolley

Correct Angle

Emergency Release Handle

Outer Trolley

Door Arm

Door with Backward Slant (Incorrect)

ADJUSTMENT STEP 1

Adjust the Travel Limits

Limit adjustment settings regulate the points at which the door will stop when moving up or down.

To operate the opener, press the Door Control push bar. Run the opener through a complete travel cycle.

• Does the door open and close completely?

• Does the door stay closed and not reverse unintentionally when fully closed?

If your door passes both of these tests, no limit adjustments are necessary unless the reversing test fails (Adjustment Step 3, page 25).

Adjustment procedures are outlined below. Read the procedures carefully before proceeding to Adjustment Step 2. Use a screwdriver to make limit adjustments. Run the opener through a complete

travel cycle after each adjustment.

NOTE: Repeated operation of the opener during adjustment procedures may cause the motor to overheat and shut off. Simply wait 15 minutes and try again.

NOTE: If anything interferes with the door’s upward travel, it will stop. If anything interferes with the door’s downward travel (including binding or unbalanced doors), it will reverse.

HOW AND WHEN TO ADJUST THE LIMITS

• If the door does not open completely but opens at least 5 feet (1.5 m):

Increase up travel. Turn the UP limit adjustment screw clockwise. One turn equals 3" (7.5 cm) of travel.

NOTE: To prevent the trolley from hitting the cover protection bolt, keep a minimum distance of 2-4" (5 cm - 10 cm) between the trolley and the bolt.

• If door does not open at least 5 feet (1.5 m):

Adjust the UP (open) force as explained in Adjustment Step 2.

• If the door does not close completely:

Increase down travel. Turn the down limit adjustment screw counterclockwise. One turn equals 3" (7.5 cm) of travel.

If door still won't close completely and the trolley bumps into the pulley bracket (page 4), try lengthening the door arm (page 21) and decreasing the down limit.

• If the opener reverses in fully closed position:

Decrease down travel. Turn the down limit adjustment screw clockwise. One turn equals 3" (7.5 cm) of travel.

Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door.

• Incorrect adjustment of garage door travel limits will interfere with proper operation of safety reversal system.

• If one control (force or travel limits) is adjusted, the other control may also need adjustment.

• After ANY adjustments are made, the safety reversal system MUST be tested. Door MUST reverse on contact with 1-1/2" high (3.8 cm) object (or 2x4 laid flat) on floor.

• If the door reverses when closing and there is no visible interference to travel cycle:

If the opener lights are flashing, the Safety Reversing Sensors are either not installed, misaligned, or obstructed. See Troubleshooting, page 18.

Test the door for binding: Pull the emergency release handle. Manually open and close the door. If the door is binding or unbalanced, call for a trained door systems technician. If the door is balanced and not binding, adjust the DOWN (close) force. See Adjustment Step 2.

WARNING

To prevent damage to vehicles, be sure fully open door provides adequate clearance.

WARNING

CAUTION

Cover Protection Bolt

2-4"

(5-10 cm)

Left Side Panel

Limit Adjustment Screws

ADJUSTMENT LABEL

ADJUSTMENT STEP 2

Adjust the Force

Force adjustment controls are located on the back panel of the motor unit. Force adjustment settings regulate the amount of power required to open and close the door.

If the forces are set too light, door travel may be interrupted by nuisance reversals in the down direction and stops in the up direction. Weather conditions can affect the door movement, so occasional adjustment may be needed.

The maximum force adjustment range is about 3/4 of a complete turn. Do not force controls beyond that point. Turn force adjustment controls

with a screwdriver.

NOTE: If anything interferes with the door’s upward travel, it will stop. If anything interferes with the door’s downward travel (including binding or unbalanced doors), it will reverse.

HOW AND WHEN TO ADJUST THE FORCES

1. Test the DOWN (close) force

• Grasp the door bottom when the door is about halfway through DOWN (close) travel. The door should reverse. Reversal halfway through down

travel does not guarantee reversal on a 1-1/2" (3.8 cm) obstruction. See Adjustment Step 3, page 25. If the door is hard to hold or doesn’t

reverse, DECREASE the DOWN (close) force by turning the control counterclockwise. Make small adjustments until the door reverses normally. After each adjustment, run the opener through a complete cycle.

• If the door reverses during the down (close) cycle and the opener lights aren’t flashing,

INCREASE DOWN (close) force by turning the control clockwise. Make small adjustments until the door completes a close cycle. After each adjustment, run the opener through a complete travel cycle. Do not increase the force beyond the

minimum amount required to close the door.

2. Test the UP (open) force

• Grasp the door bottom when the door is about halfway through UP (open) travel. The door should stop. If the door is hard to hold or doesn’t stop, DECREASE UP (open) force by turning the control counterclockwise. Make small adjustments until the door stops easily and opens fully. After each adjustment, run the opener through a complete travel cycle.

• If the door doesn’t open at least 5 feet (1.5 m),

INCREASE UP (open) force by turning the control clockwise. Make small adjustments until door opens completely. Readjust the UP limit if necessary. After each adjustment, run the opener through a complete travel cycle.

Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door.

• Too much force on garage door will interfere with proper operation of safety reversal system.

• NEVER increase force beyond minimum amount required to close garage door.

• NEVER use force adjustments to compensate for a binding or sticking garage door.

• If one control (force or travel limits) is adjusted, the other control may also need adjustment.

• After ANY adjustments are made, the safety reversal system MUST be tested. Door MUST reverse on contact with 1-1/2" high (3.8 cm) object (or 2x4 laid flat) on floor.

WARNING

Right Panel

Force Adjustment Controls

Antenna

FORCE ADJUSTMENT LABEL

Open Force

Close Force

+ 56 hidden pages

Chamberlain 3885C User Manual

TABLE OF CONTENTS

INTRODUCTION

Preparing your garage door

Tools needed

Planning

Carton Inventory

INSTALLATION