Chamberlain 3850PC User Manual

GARAGE DOOR OPENER

Model 3850PC

For Residential Use Only

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

www.liftmaster.com

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

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.

is connected and properly

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 door control . . . . . . . . . . . . . . . . . . . . . . . . . .13

Install the StandBy Power (optional) . . . . . . . . . . . . . . . 14

Install the lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

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

Install the Protector System

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

Operation 26-33

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

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

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

Using the remote control . . . . . . . . . . . . . . . . . . . . . . . . 28

StandBy Power (optional). . . . . . . . . . . . . . . . . . . . . . . . 29

To open the door manually. . . . . . . . . . . . . . . . . . . . . . . 30

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

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

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

Smart Control Panel™ Messages . . . . . . . . . . . . . . . . . 33

Programming 34-35

To add or reprogram a hand-held remote control . . . . . 34

To erase all codes from motor unit memory. . . . . . . . . . 34

3-Button remotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

To add, reprogram or change a Keyless Entry PIN . . . . 35

Repair Parts 36-37

Rail assembly parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Installation parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Motor unit assembly parts . . . . . . . . . . . . . . . . . . . . . . . 37

Accessories 38 Notes 39 Repair Parts and Service 40 Warranty 40

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.

When you see these Safety Symbols and Signal Words on the following pages, they will alert you to the possibility of

Mechanical

Electrical

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.

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.

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.

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.

Sectional Door

One-Piece Door

Carpenter's Level (optional)

Drill

Tape Measure

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

Tools needed

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

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

Safety Reversing Sensor

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

— — — — — — — —

Header Wall

FINISHED CEILING

Torsion Spring

Extension Spring

Safety Reversing Sensor

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

Access Door

Wallmounted Door Control

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

Motor Unit

Vertical Centerline of Door

Planning

FINISHED CEILING

Support bracket & fasten

ing

hardw

are is required.

See page 12.

Safety Reversing Sensor

Header Wall

Access Door

Safety

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

Wall-

mounted

Door

Control

Motor Unit

Access Door

Safety Reversing Sensor

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

Safety Reversing Sensor

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.

SECTIONAL DOOR INSTALLATION

ONE-PIECE DOOR WITHOUT TRACK

ONE-PIECE DOOR WITH TRACK

Carton Inventory

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

LOCK

LIGHT

Smart Control Panel™

2-Conductor Bell Wire White & White/Red

SECURITY

3-Button Remote Control

Motor Unit w/Light Lenses

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

Remote Control Visor Clip

Styrofoam

Battery

(Optional)

Belt

Belt Cap Retainer

One-Piece Rail

Door Bracket

Belt Pulley Bracket

Safety Sensor Bracket (2)

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)

ONLY

CEILING MOUNT

Trolley

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

Header Bracket

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)

Curved Door Arm Section

Safety Labels and Literature

Straight Door Arm Section

ASSEMBLY STEP 1

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

Rail Hole

Motor Unit Belt Pulley

Rail Hole

USE ONLY THIS TYPE AND SIZE

BOLT

Trolley Threaded Shaft

Spring/Trolley Nut

Nut Ring

Trolley Threaded Shaft

Nut Ring Slots

Square End

Nut Ring Trolley

Nut Ring

Trolley

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

BEFORE AFTER RELEASE

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, belt 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.

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 3

Figure 1

Figure 2

ASSEMBLY STEP 3

Hex Screw #8x3/8"

WARNING

WARNINGWARNING

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.

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.

8x3/8" Hex Screws

HARDWARE SHOWN

INSTALLATION

IMPORTANT INSTALLATION INSTRUCTIONS

Belt Cap Retainer

ACTUAL SIZE

Motor Unit Belt Pulley

Mounting Plate

To reduce the risk of SEVERE INJURY or DEATH:

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 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.

13. To avoid SERIOUS PERSONAL INJURY or DEATH from

electrocution, disconnect ALL electric and battery power BEFORE performing ANY service or maintenance.

INSTALLATION STEP 1

Header Wall

Sectional door with curved track

Highest Point of Travel

Door

Track

2" (5 cm)

One-piece door with horizontal track

Door

Track

Header Wall

Highest Point of Travel

2" (5 cm)

Unfinished Ceiling

OPTIONAL CEILING MOUNT FOR HEADER BRACKET

Header Wall

2x4

Structural Supports

Vertical Centerline of Garage Door

Level (optional)

2x4

Door

Jamb Hardware

One-piece door without track: jamb hardware

8" (20 cm)

Highest Point of Travel

Door

Pivot

8" (20 cm)

One-piece door without track: pivot hardware

Highest Point of Travel

Header Wall

Determine the Header Bracket Location

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.

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 inter secting 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.

INSTALLATION STEP 2

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

Highest Point of Garage Door Travel

Vertical Centerline of Garage Door

Header Wall

Garage Door

CEILING MOUNT ONLY

Wall Mounting Holes

Optional Wall Mounting Holes

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

T O

Door Spring

Header Bracket

2x4 Structural Support

Vertical Centerline of Garage Door

Horizontal Line

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

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 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.

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

Header Wall

Header Bracket

Belt Pulley Bracket

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.

Ring

Header Bracket

Fastener

Garage Door

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

HARDWARE SHOWN ACTUAL SIZE

Belt Pulley Bracket

Rail

Temporary Support

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

Ring Fastener

INSTALLATION STEP 4

Rail

Door

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

Top of Motor Unit

Header Bracket

Top of Door

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

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.

Trolley Release Arm

ENGAGED

RELEASED

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 5

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

Nut 5/16"-18

Lock Washer 5/16"

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

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.

Structural

Figure 1

Measure Distance

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

Supports

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

Figure 2

Hidden Support

Bracket (Not Provided)

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

— FINISHED CEILING —

HARDWARE SHOWN ACTUAL SIZE

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

Figure 3

(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

Drywall Anchors

Insulated Staples

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

Screw 6-32x1" (pre-wired)

Quick-Connect Terminals

Antenna

Push Bar

Light Button

Lock Button

Door Control Terminal Screws

(BACK VIEW)

R 1

2-Conductor Bell Wire

LOC

Strip wire 7/16"

7/16" (11 mm)

Red GreyWhite

To insert or release wire, push in tab with screwdriver tip

Door Control Connections

Strip wire 7/16"

7/16" (11 mm)

Red GreyWhite

To insert or release wire, push in tab with screwdriver tip

Door Control Connections

Install the Door Control

Locate door control 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).

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

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

SPECIAL NOTE: Only one 398LMC 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 378LMC wireless wall control as the secondary door control.

1. Strip 7/16" (11 mm) of insulation from one end of bell

2. Remove push bar cover by gently prying at the lower/

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

• Position bottom of door control on screw head and

• Drill and install top screw with care to avoid cracking

• Replace cover by inserting top tabs first and then snap

3. (For standard installations ONLY) Run bell wire up

4. Strip 7/16" (11 mm) of insulation from end of bell wire.

NOTE: If you have any trouble with the operation of the buttons, loosen the top mounting screw. DO NOT connect 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.

wire and connect to the two screw terminals on back of door control by color: white wire to the W (2) and white/ red wire to the R (1) (Figure 2).

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:

above wall surface.

slide down to secure. Adjust screw for snug fit.

plastic housing. Do NOT overtighten.

cover in place.

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.

Connect bell wire to the quick-connect terminals on the motor unit: white to white and white/red to red. To insert or release wires, push in tab with screwdriver tip (Figure 3).

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.

HARDWARE SHOWN ACTUAL SIZE

Figure 1

REMOVE & REPLACE COVER

To Replace Insert Top Tabs First

Push Bar Cover

LOCK

IGHT

LOCK

PRE-WIRED INSTALLATION

24 Volt Bell Wire

IGHT

Figure 2

Figure 3

Lens Hinge

100 Watt (Max) Standard Light Bulb

Release Tab

100 Watt (Max) Standard Light Bulb

INSTALLATION STEP 7

Battery

Battery Cover

Install the Standby Power (Optional)

• Make sure motor unit is unplugged.

• Using a Phillips head screwdriver, remove the battery cover on the motor unit.

• Partially insert battery into motor unit with terminals facing out.

• Connect red (+) and black (-) wires from motor unit to corresponding terminals on battery.

• Replace battery cover.

INSTALLATION STEP 8

Install the Lights

• 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.

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.

RIGHT

WRONG

Ground Tab

Green Ground Screw

Ground Wire

Black Wire

PERMANENT WIRING CONNECTION

White Wire

Black Wire

INSTALLATION STEP 9

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 (1.8 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 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.

Overhand Knot

Trolley

Emergency Release Handle

Overhand Knot

NOTICE

Rope

Release Arm

INSTALLATION STEP 10

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" (2 cm) 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:

• Disconnect ALL electric and battery power BEFORE performing ANY service or maintenance.

• 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.

INSTALLATION STEP 11

Install The Protector System (Safety Reversing Sensors)

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.

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.

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.

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

Facing the door from inside the garage

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 (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.

Figure 1

Figure 2

Figure 3

(Provided with Extension Bracket)

DOOR TRACK MOUNT (RIGHT SIDE)

Door Track

Lip

Sensor Bracket

WALL MOUNT (RIGHT SIDE)

Inside Garage Wall

WALL MOUNT (RIGHT SIDE)

Inside Garage Wall

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

Extension Bracket (See Accessories)

(Provided with Extension Bracket)

Lens

Indicator Light

Lens

Indicator Light

Sensor Bracket

Lag Screws (Not Provided)

Sensor Bracket

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

HARDWARE SHOWN ACTUAL SIZE

Wing Nut 1/4"-20

Staples

Figure 4

FLOOR MOUNT (RIGHT SIDE)

Inside Garage

Wall

Lens

Attach with Concrete Anchors (Not Provided)

Indicator Light

Sensor Bracket

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

Lens

Wing Nut 1/4"-20

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. To insert or release wires, push in tab with screwdriver tip (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.

Figure 5MOUNTING AND WIRING THE SAFETY

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

Bell Wire

Safety Reversing Sensor

Finished Ceiling

Invisible Light Beam Protection Area

Bell Wire

Safety Reversing Sensor

Connect Wire to Quick-Connect Terminals

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

2. Twist like colored wires together

3. To insert or release wire, push in tab with screwdriver tip

Red

Quick-Connect Terminals

White

7/16" (11 mm)

Grey

INSTALLATION STEP 12

Vertical Centerline of Garage Door

Door Bracket Location

Header Bracket

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

Door Bracket

Vertical Centerline of Garage Door

Vertical Reinforcement

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

Door Bracket

Nut 5/16"-18

Bolt 5/16"-18x2"

Lock Washer 5/16"

Vertical Reinforcement

(Not Provided)

Vertical Centerline of Garage Door

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

Vertical Centerline of Garage Door

Inside Edge of Door or Reinforcement Board

Bolt 5/16"x2"

(Not Provided)

Vertical Centerline of Garage Door

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 13.

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.

Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket.

Contact your door manufacturer for reinforcement kit.

Figure 1

Figure 2B

Figure 2A

HARDWARE SHOWN ACTUAL SIZE

Figure 4

Figure 3

ONE-PIECE DOORS

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

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.)

Header Wall

Header

Bracket

Door Bracket

Optional Placement of Door Bracket

Vertical Centerline of Garage Door

2x4 Support

Finished Ceiling

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

HARDWARE SHOWN

Door Bracket

Nut 5/16"-18

Door Bracket

ACTUAL SIZE

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 13

Connect Door Arm to Trolley

Inner 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) (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

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"

HARDWARE SHOWN ACTUAL SIZE

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

Figure 2

Lock Washers 5/16"

Nuts 5/16"-18

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

Bolts 5/16"-18x7/8"

Cut This End

Figure 3

Door Arm

Door Arm Connector Hole

Closed Door

Outer Trolley

Emergency Release Handle

Inner Trolley

Outer Trolley

Open Door

Door Arm

Correct Angle

Door with Backward Slant (Incorrect)

Inner Trolley

ALL ONE-PIECE DOORS

Nuts 5/16"-18

Lock Washers 5/16"

Ring Fastener

Straight Arm

Bolts 5/16"-18x7/8

Door Bracket

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

Curved Door Arm

1. Assemble the Door Arm:

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

• Make sure the garage door is fully 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.

• Pull the emergency release handle, disconnecting the outer trolley from the inner trolley by pulling straight down on the emergency release handle and sliding the outer trolley back toward the motor unit.

• Connect the curved door arm section to the trolley using the 5/16"x1-1/4" clevis pin and ring fastener.

NOTE: Adjusting the limits on the following page:

• The trolley will automatically connect. If not, review the

trolley lockout feature on page 30.

• 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

ADJUSTMENT STEP 1

BLACK

PURPLE

Push and hold until the door is at desired UP position

Indicator Light

Push either button to stop door at desired DOWN position

BLACK

PURPLE

Indicator Light

Black Button

Purple Button

LOCK

LIGHT

Program the Travel Limits

Travel limits regulate the points at which the door will stop when moving up or down. Follow the steps below to set the limits.

Figure 1

To program the travel limits:

Adjust the position of the door by using the black and purple buttons. Black moves the door UP (open) and purple moves the door DOWN (close).

1. Setting the UP position: Press and hold the black

button until the yellow indicator light starts flashing slowly then release.

2. Push and hold the black button until the door reaches

the desired UP (open) position (Figure 2).

NOTE: Check to be sure the door opens high enough for your vehicle.

3. Push the remote control or door control (Figure 3). This

sets the UP (open) limit and begins closing the door.

4. Immediately when the door begins to move down, press

and release either the black or purple button. This will stop the door.

5. Setting the DOWN position: Push and hold the purple

button until the door reaches the desired DOWN (closed) position (Figure 4).

6. Once the door is closed, if there appears to have too

much pressure on the door, you may toggle the door back and forth using the black and purple buttons to reach the desired closed position.

7. Push the remote control or the door control (Figure 3).

This sets the DOWN (close) limit and should bring the door to the open position.

• If the opener is not stopping exactly where you would like it, repeat steps 1 through 7 and program the limits again.

• When the unit stops in both the desired up (open) and down (close) positions, proceed to Adjustment Steps

2, Setting the Force.

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.

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

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

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

Figure 2

Figure 3

Figure 4

ADJUSTMENT STEP 2

Black Button

Purple Button

Push Purple button twice to enter unit into Force

Adjustment Mode

Indicator Light

LOCK

LIGHT

Setting the Force

The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door.

1. Locate the purple button on the left panel of the motor unit (Figure 1).

2. Push the purple button twice to enter the opener into Force Adjustment Mode (Figure 1). The LED (Indicator Light) will flash quickly.

3. Push the remote control or door control (Figure 2). The door will travel to the DOWN (close) position. Push the remote control or door control again, the door will travel to the UP (open) position. Push the remote control or door control a third time to send the door to the DOWN (close) position.

The LED (Indicator Light) will stop flashing when the force has been learned.

The opener has learned the forces required to open and close your door.

The door must travel through a complete cycle, UP and DOWN, in order for the force to be set properly. If the opener cannot open and close your door fully, inspect your door to insure that it is balanced properly and is not sticking or binding. See page 3, “Preparing your garage

door.”

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 use force adjustments to compensate for a binding or sticking garage door.

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

Figure 1

Figure 2

+ 56 hidden pages

Chamberlain 3850PC User Manual

TABLE OF CONTENTS

Preparing your garage door

Tools needed

Planning

Carton Inventory

INSTALLATION

IMPORTANT INFORMATION ABOUT THE SAFETY REVERSING SENSOR

ALIGNING THE SAFETY REVERSING SENSORS

TROUBLESHOOTING THE SAFETY REVERSING SENSORS