Chamberlain 248735S 3-4 HP User Manual
GARAGE DOOR OPENER
®
Model 248735S 3/4 HP
For Residential Use Only
The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.chamberlain.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
■ Periodic checks of the opener are required to ensure safe operation.
■ The model number label is located on the left side panel of your opener.
®
is connected and properly aligned.
TABLE OF CONTENTS
Introduction 2-7
Safety symbol and signal word review . . . . . . . . . . . . . . .2
Preparing your garage door . . . . . . . . . . . . . . . . . . . . . . .3
Tools needed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Carton inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Hardware inventory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Assembly 8-11
Assemble the rail and install the trolley. . . . . . . . . . . . . . .8
Fasten the rail to the motor unit . . . . . . . . . . . . . . . . . . . .9
Install the idler pulley . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Install the chain/cable . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Tighten the chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Installation 11-26
Installation safety instructions . . . . . . . . . . . . . . . . . . . .11
Determine the header bracket location . . . . . . . . . . . . . .12
Install the header bracket . . . . . . . . . . . . . . . . . . . . . . . .13
Attach the rail to the header bracket . . . . . . . . . . . . . . . .14
Position the opener. . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Hang the opener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Install the door control . . . . . . . . . . . . . . . . . . . . . . . . . .16
Install the lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Attach the emergency release rope and handle. . . . . . . .17
Electrical requirements . . . . . . . . . . . . . . . . . . . . . . . . . .18
Install The Protector System
Fasten the door bracket. . . . . . . . . . . . . . . . . . . . . . . 23-24
Connect the door arm to the trolley . . . . . . . . . . . . . 25-26
®
. . . . . . . . . . . . . . . . . . 19-22
Adjustment 27-29
Adjust the travel limits . . . . . . . . . . . . . . . . . . . . . . . . . .27
Adjust the force. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Test the safety reversal system. . . . . . . . . . . . . . . . . . . .29
Test The Protector System
®
. . . . . . . . . . . . . . . . . . . . . .29
Operation 30-34
Operation safety instructions . . . . . . . . . . . . . . . . . . . . .30
Using your garage door opener . . . . . . . . . . . . . . . . 30 31
Using the wall-mounted door control . . . . . . . . . . . . . . .31
To open the door manually . . . . . . . . . . . . . . . . . . . . . . .31
Care of your garage door opener . . . . . . . . . . . . . . . . . .32
Having a problem? . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Diagnostic chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Programming 35-36
To add or reprogram a hand-held remote control. . . . . .35
To erase all codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
3-Button remotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
To add, reprogram or change a Keyless Entry PIN . . . . .36
Repair Parts 37-38
Rail assembly parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Installation parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Motor unit assembly parts . . . . . . . . . . . . . . . . . . . . . . .38
Accessories 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
Mechanical
Electrical
of serious injury or death if you do not comply with the
warnings that accompany them. The hazard may come
from something mechanical or from electric shock. Read
the warnings carefully.
When you see this Signal Word on the following pages, it
will alert you to the possibility of damage to your garage
door and/or the garage door opener if you do not comply
with the cautionary statements that accompany it. Read
them carefully.
2
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.
Sectional Door
To prevent possible SERIOUS INJURY or DEATH:
• ALWAYS call a trained door systems technician if
garage door binds, sticks, or is out of balance. An
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.
Stepladder
One-Piece Door
Carpenter’s
Level (optional)
Drill
Sockets and Wrench
1/2", 5/8", 7/16", 9/16"
and 1/4"
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
Wire Cutters
Pliers
3
Hack Saw
Claw Hammer
Screwdriver
Adjustable End Wrench
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 fi nd it helpful to refer back to this page
and the accompanying illustrations as you proceed with
the installation of your opener.
Depending on your requirements, there are several
installation steps which may call for materials or hardware
not included in the carton.
• Installation Step 1 – Look at the wall or ceiling above
the garage door. The header bracket must be securely
fastened to structural supports.
• Installation Step 5 – Do you have a fi nished ceiling in
your garage? If so, a support bracket and additional
fastening hardware may be required.
• Installation Step 10 – Depending upon garage
construction, extension brackets or wood blocks may
be needed to install sensors.
• Installation Step 10 – Alternate fl oor mounting of
the safety reversing sensor will require hardware not
provided.
• Do you have an access door in addition to the garage
door? If not, Model 7702CB Emergency Key Release is
required. See Accessories page.
• Look at the garage door where it meets the fl oor. Any
gap between the fl oor and the bottom of the door must
not exceed 1/4" (6 mm). Otherwise, the safety reversal
system may not work properly. See Adjustment Step 3.
Floor or door should be repaired.
SECTIONAL DOOR INSTALLATIONS
• Do you have a steel, aluminum, fi berglass or glass
panel door? If so, horizontal and vertical reinforce ment
is required (Installation Step 11).
• The opener should be installed above the center of the
door. If there is a torsion spring or center bearing plate
in the way of the header bracket, it may be installed
within 4 feet (1.22 m) to the left or right of the door
center. See Installation Steps 1 and 11.
• If your door is more than 7 feet (2.13 m) high, see rail
extension kits listed on Accessories page.
SECTIONAL DOOR INSTALLATION
Horizontal and vertical reinforcement
is needed for lightweight garage
doors (fi berglass, steel, aluminum,
door with glass panels, etc.).
See page 23 for details.
Safety Reversing Sensor
Header
Wall
Vertical
Centerline of
Garage Door
Gap between fl oor and
bottom of door must not
exceed 1/4" (6 mm).
Slack in chain
tension is
normal when
garage door is
closed.
Torsion Spring
Wall-Mounted
Door Control
Safety
Reversing Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 15.
Extension Spring
OR
4
Header
Wall
Garage
Door
Header
Bracket
Garage
Door
Spring
Motor Unit
Trolley Stop
Bolt
Straight
Door
Arm
Curved Door Arm
Door Bracket
Trolley
Chain
Emergency
Release
Rope &
Handle
Planning (Continued)
ONE-PIECE DOOR INSTALLATIONS
• Generally, a one-piece door does not require
reinforcement. If your door is lightweight, refer to the
information relating to sectional doors in Installation
Step 11.
• Depending on your door’s construction, you may need
additional mounting hardware for the door bracket
(Step 11).
Without a properly working safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
• The gap between the bottom of the garage door
and the fl oor MUST NOT exceed 1/4" (6 mm).
Otherwise, the safety reversal system may NOT
work properly.
• The fl oor or the garage door MUST be repaired to
eliminate the gap.
ONE-PIECE DOOR WITHOUT TRACK
Header Wall
Gap between fl oor and
Safety
Reversing Sensor
bottom of door must not exceed 1/4" (6 mm).
ONE-PIECE DOOR WITH TRACK
FINISHED CEILING
Support bracket & fastening
hardware is required.
See page 15.
Rail
Slack in chain tension
is normal when garage
door is closed.
Wall-mounted
Door Control
Access
Door
Safety
Reversing Sensor
Header
Wall
Motor Unit
Trolley
Stop Bolt
Header
Bracket
Door Bracket
Straight Door
Arm
Garage Door
CLOSED POSITION
Cable
Rail
Curved
Door
Arm
Trolley
Emergency
Release
Rope &
Handle
Safety Reversing
Sensor
Gap between fl oor and
bottom of door must
not exceed 1/4" (6 mm).
Header
Wall
Safety
Reversing Sensor
Door
Bracket
Garage
Door
CLOSED POSITION
Cable
Curved
Door Arm
Straight Door
Arm
Chain
Rail
Emergency
Release
Rope &
Handle
Trolley
Stop Bolt
Header
Bracket
5
Carton Inventory
Your garage door opener is packaged in one carton which
contains the motor unit and all parts illustrated below.
Accessories will depend on the model purchased. If
anything is missing, carefully check the packing material.
®
3-Button
Motor Unit with 2 Light Lenses
Multi-Function
Door Control
Trolley
SECURITY✚
Remote Control with Visor Clip (2)
Chain and Cable
PARTS MAY BE STUCK IN THE FOAM. Hardware for
assembly and installation is shown on the next page.
Save the carton and packing material until installation and
adjustment is complete.
Idler Pulley
Chain Spreader
Rail
Center/Back
Sections
Door Bracket
2-Conductor Bell Wire
White & White/Red
Rail
Front (header)
Section
Safety Reversing
Sensor Bracket (2)
“U” Bracket
Hanging Brackets
Curved Door
Arm Section
The Protector System
(2) Safety Reversing Sensors
(1 Sending Eye and 1 Receiving Eye)
with 2-Conductor White & White/Black
Bell Wire attached
®
6
Header Bracket
Straight Door
Arm Section
Safety Labels
and Literature
ASSEMBLY STEP 1
Assemble the Rail & Install the Trolley
To avoid installation diffi culties, do not run the garage
door opener until instructed to do so.
The front rail has a cut out “window” at the door end
(see illustration). The hole above this window is larger
on the top of the rail than on the bottom. A smaller hole
3-1/2" (8.9 cm) away is close to the rail edge. Rotate the
back rail so it has a similar hole close to the opposite
edge, about 4-3/4" (12 cm) from the far end.
1. Remove the straight door arm and hanging bracket
packaged inside the front rail and set aside for
Installation Step 5 and 12. NOTE: To prevent INJURY
while unpacking the rail carefully remove the straight
door arm stored within the rail section.
2. Align the rail sections on a fl at surface as shown and
slide the tapered ends into the larger ones. Tabs along
the side will lock into place.
To prevent INJURY from pinching, keep hands and
fi ngers away from the joints while assembling the rail.
3. Place the motor unit on packing material to protect
the cover, and rest the back end of the rail on top.
For convenience, put a support under the front end of
the rail.
4. As a temporary trolley stop, insert a screwdriver into
the hole 10" (25 cm) away from the front of the rail,
as shown.
5. Check to be sure there are 4 plastic wear pads inside
the inner trolley. If they became loose during shipping,
check all packing material. Snap them back into
position as shown.
6. Slide the trolley assembly along the rail from the back
end to the screwdriver.
Trolley
Window
Cut-Out
Screwdriver
Idler
Pulley
Hole
Tabs
Front Rail
(TO DOOR)
KEEP LARGER
HOLE ON TOP
FRONT RAIL
(TOP)
Tapered
End
Tapered
End
Tapered
End
Back Rails
(TO MOTOR UNIT)
Tapered
End
Outer Trolley
Inner Trolley
Wear Pads
8
ASSEMBLY STEP 2
Fasten the Rail to the Motor Unit
• Insert a 1/4"-20x2" bolt, washer and spacer into the
cover protection bolt hole on the back end of the rail
as shown. Tighten securely with a 1/4"-20 lock nut.
DO NOT overtighten.
• Remove the bolt and lock nut from the top of the
motor unit.
• Attach spreader to the motor unit with two screws.
• Place the “U” bracket, fl at side down onto the bolt
mounted on the motor unit and align the bracket hole
with the bolt holes. Fasten with the previously removed
bolt and lock nut.
• Align the rail assembly with the top of the motor unit.
Slide the rail end onto the “U” bracket, all the way to the
stops that protrude on the top and sides of the bracket.
HARDWARE SHOWN ACTUAL SIZE
To avoid SERIOUS damage to garage door opener,
use ONLY those bolts/fasteners mounted in the top of
the opener.
Hex Screws
Bolt
Washer
Spacer
Cover
Protection
Bolt Hole
8-32x7/16"
Bolt
Lock Nut
“U” Bracket
Chain Spreader
Motor Unit
Sprocket
Washer 5/8"
Spacer
Bolt 1/4"-20x2"
Lock Nut
1/4"-20
ASSEMBLY STEP 3
Install the Idler Pulley
• Lay the chain/cable beside the rail, as shown. Grasp
the end with the cable loop and pass approximately 12"
(30 cm) of cable through the window. Allow it to hang
until Assembly Step 5.
• Remove the tape from the idler pulley. The inside center
should be pre-greased. If dry, regrease to ensure proper
operation.
• Place the idler pulley into the window as shown.
• Insert the idler bolt from the top through the rail
and pulley. Tighten with a 3/8" lock washer and nut
underneath the rail until the lock washer is compressed.
• Rotate the pulley to be sure it spins freely.
• Insert a 1/4"-20x1-3/4" bolt into the trolley stop hole in
the front of the rail as shown. Tighten securely with a
1/4"-20 lock nut.
HARDWARE SHOWN ACTUAL SIZE
Chain and Cable
Idler
Bolt
Lock
Washer
3/8"
Lock Nut
Screwdriver
Nut
3/8"
Bolt 1/4"-20x1-3/4"
SLIDE RAIL TO
STOPS ON TOP AND
SIDES OF BRACKET
Bolt
Pulley
Washer
Trolley
Grease
Inside Pulley
Idler
Pulley
Cable Link
Rail
Nut
Trolley
Stop Hole
Idler
Pulley
Bolt
Lock
Nut
Lock Nut 1/4"-20Lock Washer 3/8"
Nut 3/8"
Idler Bolt
9
INSTALLATION STEP 1
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 13) 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 13.
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 13 for ceiling installation.
Unfi nished
Ceiling
Header Wall
Header Wall
Highest Point
of Travel
Door
Sectional door with
curved track
Header Wall
Door
Jamb
Hardware
Vertical Centerline
of Garage Door
Level
(optional)
2" (5 cm)
Track
8" (20 cm)
Highest
Point of
Travel
2x4
2x4
Header Wall
Door
One-piece door with
horizontal track
Header Wall
8" (20 cm)
Door
OPTIONAL
CEILING
MOUNT
FOR
HEADER
BRACKET
Structural
Supports
2" (5 cm)
Track
Highest
Point of
Travel
Highest
Point of
Travel
Pivot
One-piece door without track:
jamb hardware
12
One-piece door without track:
pivot hardware
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