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Chamberlain 248754 - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.chamberlain.com GARAGE DOOR OPENER Model 248754 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 Protec ...
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Chamberlain 248754 - page 2
2 TABLE OF CONTENTS 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 ...
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Chamberlain 248754 - page 3
3 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 ...
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Chamberlain 248754 - page 4
4 Safety Re v ersing Sensor Header W all Access Door — — — — — — — — Safety Rev ersing Sensor Gap between floor and bottom of door must not e xceed 1/4" (6 mm). Extension Spring Horizontal and vertical reinforcement is needed for lightw eight garage doors (fiberglass, steel, aluminum, door with glass panels, etc.). See page 24 ...
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Chamberlain 248754 - page 5
5 Access Door Safety Reversing Sensor Safety Reversing Sensor Gap between floor and bottom of door must not exceed 1/4" (6 mm). Garage Door Header W all Header Bracket Door Bracket Straight Door Arm Curved Door Arm T rolley Emergency Release Rope & Handle Rail Belt T rolley Stop Bolt CLOSED POSITION Planning (Continued) ONE-PIECE DOOR INST ...
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Chamberlain 248754 - page 6
6 SECURITY ✚ ® 3-Button Remote Control (2) Belt Curved Door Arm Section Safety Labels and Literature Straight Door Arm Section Hanging Brack ets Motion Detecting Control Console Door Brack et The Protector System ® (2) Safety Re v ersing Sensors (1 Sending Eye and 1 Receiving Ey e) with 2-Conductor White & White/Blac k Bell Wire attached Sa ...
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Chamberlain 248754 - page 7
7 Master Link (2) Idler Bolt (1) Nut 3/8" (1) T rolley Threaded Shaft (1) Bolt 1/4"-20x1-3/4" (2) Lock W asher 3/8" (1) Lock Nut 1/4"-20 (2) Spacer (2) Wing Nut 1/4"-20 (2) Carriage Bolt 1/4"-20x1/2" (2) Handle Nut 5/16"-18 (8) Ring Fastener (3) Insulated Staples (30) Drywall Anchors (2) Clevis Pin 5/16& ...
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Chamberlain 248754 - page 8
FRONT RAIL (T OP) KEEP LARGER HOLE ON TOP 8 ASSEMBLY STEP 1 Assemble the Rail and Install the Trolley To avoid installation difficulties, do not run the garage door opener until instructed to do so. Front Rail (T O DOOR) Window Cut-Out Screwdriver Idler Pulley Hole T abs Back Rails (T O MOT OR UNIT) T rolley T apered End T apered End Inner T rolley ...
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Chamberlain 248754 - page 9
9 To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener. ASSEMBLY STEP 2 Fasten the Rail to the Motor Unit • Insert a 1/4"-20x1-3/4 bolt 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. • Remo ...
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Chamberlain 248754 - page 10
10 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. T rolle y Connector Idler Pulley Retaining Slot Hole Master Link Clip-On Spring Master Link Cap T rolle y Threaded Shaft Master Link Bar Pin Notch He ...
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Chamberlain 248754 - page 11
11 INSTALLATION ASSEMBLY STEP 5 Set the Tension • Insert a screwdriver tip into one of the nut ring slots and brace it firmly against the trolley. • Place a 7/16" open end wrench on the square end. Rotate the nut about 1/4 turn until the spring releases and snaps the nut ring against the trolley. This sets the spring to optimum belt tensio ...
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Chamberlain 248754 - page 12
12 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 f ...
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Chamberlain 248754 - page 13
13 Lag Screws 5/16"x9x1-5/8" – Finished Ceiling – Door Spring Header Wall UP Ceiling Mounting Holes 6" (15 cm) Maximum Header Bracket Vertical Centerline of Garage Door Garage Door Vertical Centerline of Garage Door INSTALLATION STEP 2 Install the Header Bracket You can attach the header bracket either to the wall above the garag ...
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Chamberlain 248754 - page 14
14 INSTALLATION STEP 3 Attach the Rail to the Header Bracket NOTE: (Optional) With some existing installations, you may re-use the old header bracket with the two plastic spacers included in the hardware bag. Place the spacers inside the bracket on each side of the rail, as illustrated. • Position the opener on the garage floor below the header b ...
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Chamberlain 248754 - page 15
15 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. ? ...
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Chamberlain 248754 - page 16
16 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 (Figures 2 and 3), attach a sturdy metal bracket to structural supports before installing the opener. This bracket and fastening hardware are not pro ...
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Chamberlain 248754 - page 17
17 To prevent possible SERIOUS INJURY or DEATH from electrocution: • Disconnect ALL electric and battery power BEFORE performing ANY service or maintenance. • 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 ch ...
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Chamberlain 248754 - page 18
18 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 l ...
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Chamberlain 248754 - page 19
19 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 cle ...
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Chamberlain 248754 - page 20
20 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 ...
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Chamberlain 248754 - page 21
21 Facing the door from inside the garage. INSTALLATION STEP 11 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 obst ...
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Chamberlain 248754 - page 22
22 DOOR TRACK MOUNT (RIGHT SIDE) Indicator Light Lens Lip Sensor Brack et Door T rack FLOOR MOUNT (RIGHT SIDE) W ALL MOUNT (RIGHT SIDE) Indicator Light Sensor Brack et Lens Extension Brack et (See Accessories) Inside Garage W all (Provided with Extension Brack et) (Provided with Extension Brack et) Figure 1 Figure 2 Figure 3 Figure 4 W ALL MOUNT (R ...
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Chamberlain 248754 - page 23
23 Carriage Bolt 1/4 " -20x1/2 " Lens Wing Nut Figure 5 MOUNTING 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 ex ...
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Chamberlain 248754 - page 24
24 Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit. INSTALLATION STEP 12 Fasten the Door Bracket Follow instructions which apply to your door type as illustrated below or on the following page. A horizontal reinforcement brace ...
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Chamberlain 248754 - page 25
25 Header W all V ertical Centerline of Garage Door Finished Ceiling Optional Placement of Door Bracket Header Bracket Door Bracket 2x4 Support 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. MET AL DOOR T op of Door (Inside Garage) Door Bracket Optio ...
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Chamberlain 248754 - page 26
26 INSTALLATION STEP 13 Connect Door Arm to 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 pulley ...
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Chamberlain 248754 - page 27
27 Door Arm Closed Door Outer Trolley Emergency Release Handle Open Door Door with Backward Slant (Incorrect) Correct Angle Inner Trolley Inner Trolley Outer Trolley Figure 5 ALL ONE-PIECE DOORS 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) (Figure ...
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Chamberlain 248754 - page 28
ADJUSTMENT STEP 1 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. 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. Set ...
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Chamberlain 248754 - page 29
29 ADJUSTMENT STEP 2 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 ...
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Chamberlain 248754 - page 30
30 Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. • Safety reversal system MUST be tested every month. • 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) ...
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Chamberlain 248754 - page 31
31 OPERATION Using Your Garage Door Opener Your Security ✚ ® opener and hand-held remote control have been factory-set to a matching code which changes with each use, randomly accessing over 100 billion new codes. Your opener will operate with up to eight Security ✚ ® remote controls and one Security ✚ ® Keyless Entry System. If you purcha ...
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Chamberlain 248754 - page 32
32 Additional feature when used with the 3-button hand-held remote To control the opener lights: 1. With the door closed, press and hold a small remote button that you want to control the light. 2. Press and hold the Light button on the control console. 3. While holding the Light button, press and hold the Lock button on the control console. 4. Aft ...
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Chamberlain 248754 - page 33
33 Care of Your Opener MAINTENANCE SCHEDULE Once a Month • Manually operate door. If it is unbalanced or binding, call a trained door systems technician. • Check to be sure door opens and closes fully. Adjust limits and/or force if necessary (see pages 28 and 29). • Repeat the safety reverse test. Make any necessary adjustments (see Adjustmen ...
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Chamberlain 248754 - page 34
34 NOTE: LED is most visible with worklight off. GREEN LED: All systems are normal. • A solid LED light indicates the battery is fully charged. • A flashing LED indicates the battery is being charged. NOTE: Battery does not have to be fully charged to operate the motor unit. ORANGE LED: The motor unit has lost power and is operating off of the ...
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Chamberlain 248754 - page 35
35 Having a Problem? (Troubleshooting) 1. My door will not close and the light bulbs blink on my motor unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction. • Verify the safety reversing sensors are properly installed, aligned and free of any obstructions. Refer to ...
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Chamberlain 248754 - page 36
36 Your garage door opener is programmed with self-diagnostic capabilities. The “Learn” button/diagnostic LED will flash a number of times then pause signifying it has found a potential issue. Consult Diagnostic Chart below. Diagnostic Chart Symptom: One or both of the Indicator lights on the safety reversing sensors do not glow steady. • Ins ...
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Chamberlain 248754 - page 37
37 PROGRAMMING *3-Button Remotes (315 MHz) If provided with your garage door opener, the large button is factory programmed to operate it. Additional buttons on any Security ✚ ® 3-button remote or mini-remote can be programmed to operate other Security ✚ ® garage door openers. To Erase All Codes From Motor Unit Memory To deactivate any unwant ...
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Chamberlain 248754 - page 38
38 1. Enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold ENTER. 2. While holding the ENTER button, press and hold the LIGHT button on the Motion Detecting Door Control Console. 3. Continue holding the ENTER and LIGHT buttons while you press the push bar on the Motion Detecting Door Control Cons ...
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Chamberlain 248754 - page 39
39 8 11 12 6 N OT IC E UP CEILING MOUNT ONL Y 9 7 1 5 3 2 10 13 14 3 4 LOCK LI GH T 1 2 3 5 4 6 7 Installation Parts REPAIR PARTS Rail Assembly Parts KEY P ART NO . NO . DESCRIPTION 1 4A1008 Master link kit 2 41C5141-2 Complete trolley assemb ly 3 41A5665-2 Complete rail 4 41B4103 Spring trolley nut 5 144C54 Idler pulley 6 41A5250 Full belt assembl ...
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Chamberlain 248754 - page 40
40 Motor Unit Assembly Parts 2 1 11 7 3 8 6 4 5 9 10 10 KEY PART NO. NO. DESCRIPTION 1 41C76 Belt cap and sprocket 2 41B4245 Line cord 3 41B4375-3 Terminal block with screws 4 41A6281 Wire harness kit Complete with: 41A6282 Battery wires and plug 41A6327 Light socket wires and plug 41A6328 RPM/passpoint wires with plug 5 41D794 Motor with travel mo ...
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Chamberlain 248754 - page 41
41 CLOSED OPEN 3-Button SECURITY ✚ ® Remote Control : Includes visor clip. SECURITY ✚ ® Keyless Entry : Enables homeowner to operate garage door opener from outside by entering a password on a specially designed keyboard. Also can add a temporary password for visitors or service persons. This temporary password can be limited to a programmabl ...
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Chamberlain 248754 - page 42
42 NOTES ...
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43 NOTES ...
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Chamberlain 248754 - page 44
© 2009, The Chamberlain Group, Inc. 114A3352C All Rights Reserved HOW TO ORDER REPAIR PARTS Selling prices will be furnished on request, or parts will be shipped at prevailing prices and you will be billed accordingly. WHEN ORDERING REPAIR PARTS, ALWAYS GIVE THE FOLLOWING INFORMATION: • PART NUMBER • PART NAME • MODEL NUMBER ADDRESS ORDERS T ...
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