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Chamberlain 248735 3/4 HP - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1 196 www .chamberlain.com GARAGE DOOR OPENER Model 248735 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 T ...
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Chamberlain 248735 3/4 HP - page 2
2 T ABLE 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 Wor ...
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Chamberlain 248735 3/4 HP - page 3
3 T o prevent damage to garage door and opener: • AL W A YS disable locks BEFORE installing and operating the opener . • ONL Y operate garage door opener at 120V , 60 Hz to avoid malfunction and damage. T o prevent possible SERIOUS INJUR Y or DEA TH: • AL W A YS call a trained door systems technician if garage door binds, sticks, or is out of ...
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Chamberlain 248735 3/4 HP - page 4
4 Safety Re v ersing Sensor Horizontal and v ertical reinforcement is needed for light w eight garage doors (fi b erglass, steel, al u min u m, door w ith glass panels, etc.). See page 23 for details . Header W all Safety Re v ersing Sensor Gap b et w een floor and b ottom of door m u st not e xceed 1/4" (6 mm). Extension Spring T orsion Spr i ...
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Chamberlain 248735 3/4 HP - 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). Door Bracket Straight Door Arm Garage Door CLOSED POSITION Header Bracket Curved Door Arm Chain Emergency Release Rope & Handle Cable Rail T rolley Stop Bolt Header Wa ll Planning (Continued) ONE-PIECE DOOR INST A ...
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Chamberlain 248735 3/4 HP - page 6
6 Straight Door Arm Section C u r v ed Door Arm Section Safety La b els and Literat u re 2-Cond u ctor Bell W ire W hite & W hite/Red Chain and Ca b le Chain Spreader Hanging Brack ets (2) Safety Re v ersing Sensors (1 Sending Eye and 1 Recei v ing Ey e) w ith 2-Cond u ctor W hite & W hite/Black Bell W ire attached Door Bracket SECURITY ✚ ...
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Chamberlain 248735 3/4 HP - page 7
7 Master Link (2) Idler Bolt (1) Nut 3/8" (1) T rolley Threaded Shaft (1) Lock W asher 3/8" (1) Lock Nut 1/4"-20 (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"x1" (1) Rope Lock W asher 5/16" ...
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Chamberlain 248735 3/4 HP - page 8
FRONT RAIL (TOP) KEEP LARGER HOLE ON TOP 8 ASSEMBL Y STEP 1 Assemble the Rail & Install the T rolley T o avoid installation difficulties, do not run the garage door opener until instructed to do so. T o prevent INJUR Y from pinching, keep hands and fingers away from the joints while assembling the rail. Front Rail (T O DOOR) Window Cut-Out Scre ...
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Chamberlain 248735 3/4 HP - page 9
9 T o avoid SERIOUS damage to garage door opener , use ONL Y those bolts/fasteners mounted in the top of the opener . ASSEMBL Y STEP 2 Fasten the Rail to the Motor Unit • Insert a 1/4"-20x2-1/2 bolt, washer and spacer into the cover protection bolt hole on the back end of the rail as shown. Install lower spacer and washer then tighten secure ...
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Chamberlain 248735 3/4 HP - page 10
10 T o avoid possible SERIOUS INJURY to fingers from moving garage door opener: • AL WA YS keep hand clear of sprocket while operating opener . • Securely attach chain spreader BEFORE operating. Leave Chain and Cable Inside Dispensing Carton to Prevent Kinking. Dispensing Carton Keep Chain and Cable Taut When Dispensing "U" Bracket Mo ...
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Chamberlain 248735 3/4 HP - page 11
11 INST ALLA TION ASSEMBL Y STEP 5 Tighten the Chain • Spin the inner nut and lock washer down the trolley threaded shaft, away from the trolley . • T o tighten the chain, turn outer nut in the direction shown (Figure 1). • When the chain is approximately 1/4" (6 mm) above the base of the rail at its midpoint, re-tighten the inner nut to ...
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Chamberlain 248735 3/4 HP - page 12
12 INST ALLA TION 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 . Y ou can fasten the header bracket with ...
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Chamberlain 248735 3/4 HP - page 13
13 Lag Screws 5/16"x9x1-5/8" – Finished Ceilin g – 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 INST ALLA TION STEP 2 Install the Header Bracket Y ou can attach the header bracket either to the wall above the g ...
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Chamberlain 248735 3/4 HP - page 14
14 INST ALLA TION 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 ...
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Chamberlain 248735 3/4 HP - 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 . Y ou 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 248735 3/4 HP - page 16
16 INST ALLA TION STEP 5 Hang the Opener Three representative installations are shown. Y ours 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 a ...
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Chamberlain 248735 3/4 HP - page 17
T o prevent possible SERIOUS INJURY or DEA TH from electrocution: • Be sure power is not connected BEFORE installing door control. • Connect ONL Y to 24 VOL T low voltage wires. T o prevent possible SERIOUS INJURY or DEA TH from a closing garage door: • Install door control within sight of garage door , out of reach of children at a minimum h ...
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Chamberlain 248735 3/4 HP - page 18
18 INST ALLA TION 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 remai ...
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Chamberlain 248735 3/4 HP - page 19
19 INST ALLA TION STEP 9 Electrical Requirements T o avoid installation difficulties, do not run the opener at this time. T o 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, co ...
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Chamberlain 248735 3/4 HP - page 20
20 Invisible Light Beam Protection Area Safety Reversing Sensor 6" (15 cm) max. above floor Safety Reversing Sensor 6" (15 cm) max. above floor Facing the door from inside the garage INST ALLA TION STEP 10 Install The Protector System ® The safety reversing sensor must be connected and aligned correctly before the garage door opener will ...
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Chamberlain 248735 3/4 HP - page 21
21 DOOR TRA CK MOUNT (RIGHT SIDE) Indicator Light Lens Lip Sensor Bracket Door T rack FLOOR MOUNT (RIGHT SIDE) W ALL MOUNT (RIGHT SIDE) Indicator Light Sensor Bracket Lens Extension Bracket (See Accessories) Inside Garage W al l (Provided with Extension Bracket) (Provided with Extension Bracket) Fi g ure 1 Fi g ure 2 Fi g ure 3 Fi g ure 4 W ALL MOU ...
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Chamberlain 248735 3/4 HP - page 22
22 Carriage Bolt 1/4"-20x1/2" Lens Wing Nut 1/4"-20 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 ...
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Chamberlain 248735 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. INST ALLA TION 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 bra ...
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Chamberlain 248735 3/4 HP - page 24
24 Header W all V ertical Centerline of Garage Door Finished Ceilin g 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 Opti ...
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Chamberlain 248735 3/4 HP - page 25
25 INST ALLA TION STEP 12 Connect Door Arm to T rolley Follow instructions which apply to your door type as illustrated below and on the following page. SECTIONAL DOORS ONL Y • 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 t ...
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Chamberlain 248735 3/4 HP - page 26
26 ALL ONE-PIECE DOORS 1. Assemble the door arm, Figure 4: • Fasten the straight and curved door arm sections together to the longest possible length (with a 2 or 3 hole overlap). • With the door closed, connect the straight door arm section to the door bracket with the5/16"x1-1/4" clevis pin. • Secure with a ring fastener . 2. Adju ...
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Chamberlain 248735 3/4 HP - page 27
27 ADJUSTMENT STEP 1 Adjust the UP and DOWN T ravel Limits Limit adjustment settings regulate the points at which the door will stop when moving up or down. T o 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 rev ...
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Chamberlain 248735 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. Weat ...
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Chamberlain 248735 3/4 HP - page 29
29 Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSL Y INJURED or KILLED by a closing garage door . • Safety reversal system MUST be tested ever y month. • If one control (force or travel limits) is adjusted, the other control may also need adjustment. • After ANY adjustments are made ...
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Chamberlain 248735 3/4 HP - page 30
30 OPERA TION Using Y our Garage Door Opener Y our 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. Y our opener will operate with up to eight Security ✚ ® remote controls and one Security ✚ ® Keyless Entry System. If you pu ...
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Chamberlain 248735 3/4 HP - page 31
31 Additional feature when used with the 3-Button hand-held remote T o control the opener lights: In addition to operating the door , you may program the remote to operate the 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 door control. 3. While hol ...
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Chamberlain 248735 3/4 HP - page 32
32 CARE OF YOUR OPENER LIMIT AND FORCE ADJUSTMENTS: Weather conditions may cause some minor changes in door operation requiring some re- adjustments, particularly during the first year of operation. Pages 27 and 28 refer to the limit and force adjustments. Only a screwdriver is required. Follow the instructions carefully . Repeat the safety reverse ...
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Chamberlain 248735 3/4 HP - page 33
33 HA VING 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. • V erify the safety sensors are properly installed, aligned and free of any obstructions. Refer to Installation Step 10: Ins ...
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Chamberlain 248735 3/4 HP - page 34
34 Installed Safety Reversing Sensor Safety Reversing Sensor Bell Wire LED or Diagnostic LED "Learn" Button KG 1 3 9 7 5 KG 1 3 9 7 5 Diagnostics Located On Motor Unit Y our 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 fo ...
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Chamberlain 248735 3/4 HP - page 35
*3-Button Remotes 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 compact remote can be programmed to operate other Security ✚ ® garage door openers. T o Erase All Codes From Motor Unit Memory T o deactivate any unwanted remote, first er ...
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Chamberlain 248735 3/4 HP - page 36
1. Press and release the “learn” button on motor unit. The learn indicator light will glow steadily for 30 seconds. 2. Within 30 seconds, enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold the ENTER button. 3. Release the button when the motor unit lights blink. It has learned the code. If ...
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Chamberlain 248735 3/4 HP - page 37
3 1 5 4 2 6 37 REP AIR P AR TS Rail Assembly Parts KEY P ART NO. NO. DESCRIPTION 1 4A1008 Master link kit 2 41C5141-1 Complete trolley assembly 3 41A5665-2 Complete rail 4 144C56 Idler pulley 5 41A5807-3 Chain and cable 6 12D598-1 “U” bracket NOT SHOWN 183A163 Wear pads 7 10 12 5 NO TIC E 6 4 3 2 9 13 8 11 1 LOCK LI GHT Installation Parts KEY P ...
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Chamberlain 248735 3/4 HP - page 38
Motor Unit Assembly Parts 38 DN UP Brown Wire (Down) Contact LIMIT SWITCH ASSEMBL Y Grey Wire Y ellow Wire (Up) Contact Center Limit Contact Drive Gear 2 4 3 1 14 18 8A 16 5 17 9 10 15 13 12 6 6 11 8B 8C 7 7 KEY P ART NO. NO. DESCRIPTION 1 41A5615 Chain Spreader 2 41A5585 Gear and sprocket assembly . Complete with: Spring washer , thrust washer , r ...
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Chamberlain 248735 3/4 HP - page 39
C LO SED O PE N LO CK LIGHT 39 ACCESSORIES 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 b ...
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Chamberlain 248735 3/4 HP - page 40
© 2008, The Chamberlain Group, Inc. 1 14A3350C All Rights Reserved CHAMBERLAIN ® SER VICE IS ON CALL OUR LARGE SERVICE ORGANIZA TION SP ANS AMERICA INST ALLA TION AND SER VICE INFORMA TION IS AS NEAR AS YOUR TELEPHONE. SIMPL Y DIAL OUR TOLL FREE NUMBER: 1-800-528-9131 www .chamberlain-diy .com For professional installation, parts and service, con ...
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