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Chamberlain 248735S 3/4 HP - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.chamberlain.com GARAGE DOOR OPENER Model 248735S 3/4 HP 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 Th ...
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Chamberlain 248735S 3/4 HP - 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 248735S 3/4 HP - 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 248735S 3/4 HP - page 4
4 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 re ...
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Chamberlain 248735S 3/4 HP - page 5
5 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). ONE-PIEC ...
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Chamberlain 248735S 3/4 HP - page 6
6 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. PARTS MAY BE STUCK IN THE FOAM. Hardware for assembly and installation is shown on the next page. Save the carton and packing ...
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Chamberlain 248735S 3/4 HP - page 7
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Chamberlain 248735S 3/4 HP - page 8
8 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 ...
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Chamberlain 248735S 3/4 HP - 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"-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 ...
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Chamberlain 248735S 3/4 HP - page 10
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Chamberlain 248735S 3/4 HP - page 11
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Chamberlain 248735S 3/4 HP - page 12
12 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 ...
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Chamberlain 248735S 3/4 HP - page 13
13 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 B ...
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Chamberlain 248735S 3/4 HP - 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 fl oor below the header ...
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Chamberlain 248735S 3/4 HP - page 15
15 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 fi nished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural supports before installing the opener. This bracket and fastening hardware are ...
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Chamberlain 248735S 3/4 HP - page 16
16 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 heigh ...
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Chamberlain 248735S 3/4 HP - page 17
17 INSTALLATION STEP 7 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 248735S 3/4 HP - page 18
18 INSTALLATION STEP 9 Electrical Requirements To avoid installation diffi culties, 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 fi t into a grounding type outlet. If the plug doesn't fi t into the outlet you have, ...
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Chamberlain 248735S 3/4 HP - page 19
19 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 obst ...
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Chamberlain 248735S 3/4 HP - page 20
20 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 fl oor. They may be installed in one of three ways, as follows. Garage door track installation (preferred) (Figure 1): • Slip the ...
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Chamberlain 248735S 3/4 HP - page 21
21 Figure 5 Figure 7 Figure 6 Figure 8 Figure 9 Carriage Bolt 1/4"-20x1/2" Wing Nut 1/4"-20 Lens Safety Reversing Sensor Wires 7/16" (11 mm) 7/16" (11 mm) Pre-Installed Wires Not Provided Pre-Installed Wires Safety Reversing Sensor Wires White White/Black MOUNTING AND WIRING THE SAFETY REVERSING SENSORS Mounting • Slide a ...
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Chamberlain 248735S 3/4 HP - page 22
22 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 orange indicator light will glow regardless of alignment or obstruction. If the green indicator light in the receiving eye is off, dim, or ? ...
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Chamberlain 248735S 3/4 HP - page 23
23 Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit. 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 ...
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Chamberlain 248735S 3/4 HP - page 24
24 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 ...
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Chamberlain 248735S 3/4 HP - page 25
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Chamberlain 248735S 3/4 HP - page 26
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Chamberlain 248735S 3/4 HP - page 27
27 ADJUSTMENT STEP 1 Adjust the UP and DOWN 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 ...
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Chamberlain 248735S 3/4 HP - page 28
28 ADJUSTMENT STEP 2 Adjust the Force Force adjustment controls are located on the right 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. Weath ...
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Chamberlain 248735S 3/4 HP - page 29
29 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. • If one control (force or travel limits) is adjusted, the other control may also need adjustment. • After ANY adjustments are made, t ...
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Chamberlain 248735S 3/4 HP - page 30
30 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 248735S 3/4 HP - page 31
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Chamberlain 248735S 3/4 HP - page 32
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Chamberlain 248735S 3/4 HP - page 33
33 Having a Problem? 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 Installation Step ...
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Chamberlain 248735S 3/4 HP - page 34
34 Your garage door opener is programmed with self- diagnostic capabilities. The “Learn” button/diagnostic LED will fl ash a number of times then pause signifying it has found a potential issue. Consult Diagnostic Chart below. Installed Safety Reversing Sensor Bell Wire Diagnostics Located On Motor Unit “Learn” Button LED or Diagnostic LED ...
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Chamberlain 248735S 3/4 HP - page 35
35 1. Press and release the “learn” button on the motor unit. The learn indicator light will glow steadily for 30 seconds. 2. Within 30 seconds, press and hold the button on the hand-held remote* that you wish to operate your garage door. 3. Release the button when the motor unit lights blink. It has learned the code. If light bulbs are not ins ...
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Chamberlain 248735S 3/4 HP - page 36
36 To Add, Reprogram or Change a Keyless Entry PIN NOTE: Your new Keyless Entry must be programmed to operate your garage door opener. USING THE “LEARN” BUTTON USING THE DOOR CONTROL NOTE: This method requires two people if the Keyless Entry is already mounted outside the garage. 1. Press and release the “learn” button on motor unit. The le ...
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Chamberlain 248735S 3/4 HP - page 37
37 KEY NO. PART NO. DESCRIPTION 1 41A5273-14 Multi-Function door control 2 953D 3-Button remote control 3 10A20 3V2032 Lithium battery 4 29B137 Remote control visor clip 5 41A2828 Emergency release rope and handle assembly 6 41B4494-1 2-Conductor bell wire, white and white/red 7 41A5047-1 Door bracket w/clevis pin & fastener 8 41A5047-2 Header ...
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Chamberlain 248735S 3/4 HP - page 38
38 Motor Unit Assembly Parts LIMIT SWITCH ASSY. Brown Wire (Down) Contact Grey Wire Yellow Wire (Up) Contact Center Limit Contact Drive Gear 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 KEY NO. PART NO. DESCRIPTION 1 41A5615 Chain Spreader 2 41A5585 Gear and sprocket assembly. Complete with: Spring washer, thrust washer, retaining ring, bearing pla ...
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Chamberlain 248735S 3/4 HP - page 39
39 ACCESSORIES 953D 3-Button SECURITY ✚ ® Remote Control : Includes visor clip. 956D 3-Button Mini-Remote Control with SECURITY ✚ ® : With key ring and fastening strip. 940D 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 tempo ...
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Chamberlain 248735S 3/4 HP - page 40
© 2011, The Chamberlain Group, Inc. 114A4256 All Rights Reserved CHAMBERLAIN ® ONE YEAR LIMITED WARRANTY 10 YEAR MOTOR LIMITED WARRANTY The Chamberlain Group, Inc. (“Seller”) warrants to the fi rst retail purchaser of this product, for the residence in which this product is originally installed, that it is free from defect in materials and/o ...
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