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Manual Chamberlain 1255R - 1/2HP

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  • Chamberlain 1255R - 1/2HP - page 1

    The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1 196 www .liftmaster .com GARAGE DOOR OPENER Model Series 1200 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 ...

  • Chamberlain 1255R - 1/2HP - page 2

    2 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 on the following ...

  • Chamberlain 1255R - 1/2HP - page 3

    3 T o prevent damage to garage door and opener: • AL WA 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 INJURY OR DEA TH: • AL WA YS call a trained door systems technician if garage door binds, sticks, or is out of ba ...

  • Chamberlain 1255R - 1/2HP - page 4

    Safety Reversing Sensor Support bracket & fastening hardware is required. See page 17. — — — — — — — — Header Wall FINISHED CEILING Torsion Spring Extension Spring OR Safety Reversing Sensor Gap between floor and bottom of door must not exceed 1/4" (6 mm) Access Door Wall- mounted Door Control Horizontal and vertical reinfo ...

  • Chamberlain 1255R - 1/2HP - page 5

    5 Without a properly working safety reversal system, persons (particularly small children) could be SERIOUSL Y INJURED or KILLED by a closing garage door . • The gap between the bottom of the garage door and the floor MUST NOT exceed 1/4" (6 mm). Otherwise, the safety reversal system may not work properly . • The floor or the garage door M ...

  • Chamberlain 1255R - 1/2HP - page 6

    6 Straight Door Arm Section Curved Door Arm Section Safety Labels and Literature Header Bracket U P C E IL IN G M OU N T ON L Y Sprocket Cover 2-Conductor Bell Wire White & White/Red Lighted Door Control Button w/6ABx1-1/2" screws Light Lens (1) Remote Control Transmitter Visor Clip One-Piece Rail Styrofoam Chain Pulley Bracket Models 1256 ...

  • Chamberlain 1255R - 1/2HP - page 7

    7 Hardwar e Inventor y Separate all hardware and group as shown below for the assembly and installation procedures. Nut 5/16"-18 (4) Clevis Pin 5/16"x2-3/4" (1) NOTICE Handle Dry Wall Anchors (2) Clevis Pin 5/16"x1" (1) Clevis Pin 5/16"x1-1/4" (1) Hex Bolt 5/16"-18x7/8" (4) Rope Ring Fastener (3) Lock Wa ...

  • Chamberlain 1255R - 1/2HP - page 8

    8 T o avoid SERIOUS damage to garage door opener , use ONL Y those bolts/fasteners mounted in the top of the opener . WARN ING CAUTION WARN ING WARN ING ASSEMBL Y STEP 1 Fasten the Rail to the Motor Unit MODELS 1255R 1245R, and 1240R (For Models 1256R and 1246R see page 9) • Remove the two washered bolts mounted in top of motor unit. • Position ...

  • Chamberlain 1255R - 1/2HP - page 9

    9 ASSEMBL Y STEP 1 Fasten the Rail to the Motor Unit MODELS 1256R and 1246R ONL Y • Remove the two washered bolts mounted in top of motor unit. • Align rail and styrofoam over sprocket. • Cut tape from rail, chain and styrofoam. Remove styrofoam and pull the chain back (away from the mounting plate). • Fasten the rail with the two washered ...

  • Chamberlain 1255R - 1/2HP - page 10

    10 ASSEMBL Y STEP 2 Attach the Chain Spreader and Re-install the Chain MODELS 1256R AND 1246R ONL Y • Line up the holes in the chain spreader with the holes in the motor unit as shown. The slot in the chain spreader must fit over the Rail flange (Figure 1). • Securely fasten the chain spreader with the hardware provided. • Remove the trolley ...

  • Chamberlain 1255R - 1/2HP - page 11

    11 ASSEMBL Y STEP 5 Tighten the Chain ALL MODELS • 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. AS YOU TURN THE NUT , KEEP THE CHAIN FROM TWISTING. • When the chain is approximately 1/2" (13 mm) above the base of the rail at its ...

  • Chamberlain 1255R - 1/2HP - 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 . SECTIONAL DOOR AND ONE-PIECE DOOR WITH TRACK 1. Close the door and mark the inside vertical centerline of the garage door . 2. Extend the line onto the header wall above the d ...

  • Chamberlain 1255R - 1/2HP - page 13

    13 Header Wall V ertical Centerline of G arage Door 2 x4 U nfinished Ceiling 2 x4 OPTIONAL CEILING MOUNT FOR HEADER BRACKET Structural Supports ONE-PIECE DOOR WITHOUT TRACK 1. Close the door and mark the inside vertical centerline of your garage door . Extend the line onto the header wall above door , as shown. If headroom clearance is minimal, you ...

  • Chamberlain 1255R - 1/2HP - page 14

    14 INST ALLA TION STEP 2 Install the Header Bracket Y ou 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). W ALL HE ...

  • Chamberlain 1255R - 1/2HP - page 15

    Clevis Pin 5/1 6 " x 2-3/ 4 " Ring Fastener 15 INST ALLA TION 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 ...

  • Chamberlain 1255R - 1/2HP - page 16

    16 ONE-PIECE DOOR WITHOUT TRACK • With the door fully open and parallel to the floor , measure the distance from the floor to the top of the door . • Using a stepladder as a support, raise the top of the opener to this height. • The top of the door should be level with the top of the motor unit. Do not position the opener more than 2" (5 ...

  • Chamberlain 1255R - 1/2HP - page 17

    17 INST ALLA TION STEP 5 Hang the Opener T wo 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), attach a sturdy metal bracket to structural supports before installing the opener . This bracket and fastening hardware are not provide ...

  • Chamberlain 1255R - 1/2HP - page 18

    18 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 minimu ...

  • Chamberlain 1255R - 1/2HP - page 19

    19 INST ALLA TION STEP 7 Install the Light and Lens INST ALL THE LIGHT • Install a 75 watt maximum light bulb in the socket. The light will turn ON and remain lit for approximately 4-1/2 minutes when power is connected. Then the light will turn OFF . • Use standard neck Garage Door Opener bulbs for replacement INST ALL THE LENS (All models exce ...

  • Chamberlain 1255R - 1/2HP - page 20

    20 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 ...

  • Chamberlain 1255R - 1/2HP - page 21

    21 Invisible Light Beam Protection Area Sensor Beam 6" (15 cm) max. above floor Sensor Beam 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 move in the down direct ...

  • Chamberlain 1255R - 1/2HP - page 22

    22 DOOR TRACK MOUNT (RIGHT SIDE) In d icator Light Lens Li p Sensor Brac k et D oor T rac k FLOOR MOUNT (RIGHT SIDE) WALL MOUNT (RIGHT SIDE) In d icator Light Sensor Brac k et Lens E xtension Brac k et (See Accessories) Insi d e G arage W all (Provi d e d w ith E xtension Brac k et) (Provi d e d w ith E xtension Brac k et) Figure 1 Figure 2 Figure ...

  • Chamberlain 1255R - 1/2HP - page 23

    23 C arriage Bolt 1 /4 " -20 x1 /2 " Lens W ing Nu t Figure 5 MOUNTING AND WIRING THE SAFETY 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 exte ...

  • Chamberlain 1255R - 1/2HP - page 24

    24 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 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 o ...

  • Chamberlain 1255R - 1/2HP - page 25

    25 Header Wall Vertical 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 Top of Door (Inside Garage) Door Bracket Optional ...

  • Chamberlain 1255R - 1/2HP - page 26

    26 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 ...

  • Chamberlain 1255R - 1/2HP - page 27

    27 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 the 5/16"x1-1/4" clevis pin. • Secure with a ring fastener . 2. Adj ...

  • Chamberlain 1255R - 1/2HP - page 28

    28 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 ...

  • Chamberlain 1255R - 1/2HP - page 29

    29 ADJUSTMENT STEP 2 Adjust the Force Force adjustment controls are located on the back 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 ...

  • Chamberlain 1255R - 1/2HP - page 30

    30 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 every month. • If one control (for ce or travel limits) is adjusted, the other control may also need adjustment. • After ANY adjustments are made ...

  • Chamberlain 1255R - 1/2HP - page 31

    OPERA TION 31 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 ...

  • Chamberlain 1255R - 1/2HP - page 32

    T o Open the Door Manually The door should be fully closed if possible. Pull down on the emergency release handle and lift the door manually . T o reconnect the door to the opener , press the door control push button. The lockout feature prevents the trolley from reconnecting automatically , Pull the emergency release handle down and back (toward t ...

  • Chamberlain 1255R - 1/2HP - page 33

    33 Care of Y our Opener LIMIT AND FORCE ADJUSTMENTS: Weather conditions may cause some minor changes in door operation requiring some readjustments, particularly during the first year of operation. Pages 28 and 29 refer to the limit and force adjustments. Only a screwdriver is required. Follow the instructions carefully . Repeat the safety reverse ...

  • Chamberlain 1255R - 1/2HP - page 34

    34 Having a Problem? (Continued) 6. The garage door opens and closes by itself: • Be sure that all remote control push buttons are off. • Remove the bell wire from the door control terminals and operate from the remote only . If this solves the problem, the door control is faulty (replace), or there is an intermittent short on the wire between ...

  • Chamberlain 1255R - 1/2HP - page 35

    LO C K L I G H T *3-Button Remotes If supplied 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. T o Erase All Codes From Motor Unit Memory T o deactivate any unwanted re ...

  • Chamberlain 1255R - 1/2HP - page 36

    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 Multi-Function Door Control. 3. Continue holding the ENTER and LIGHT buttons while you press the push bar on the Multi-Function Door Control (all three buttons ...

  • Chamberlain 1255R - 1/2HP - page 37

    7 U P C E I L I N G M O U N T O N L Y 11 10 NOTICE 5 6 8 1 4 9 12 3 2 Installation Parts 37 REP AIR P ARTS KEY P ART NO. NO. DESCRIPTION 1 41A4166 Door control button 2 971LM Single-button remote control 3 10A20 3V2032 Lithium battery 4 29B137 T ransmitter visor clip 5 41A2828 Emergency release rope & handle assembly 6 41B4494-1 2-conductor bel ...

  • Chamberlain 1255R - 1/2HP - page 38

    Motor Unit Assembly Parts 38 2 1 2A 10 8 13 14 15 16 19 4 3 DN UP Bro w n Wire (Do w n) Contact LIMIT SWITCH ASSY. Grey Wire Yello w Wire (Up) Contact Center Limit Contact Drive Gear 9 20 16 12 18 11 17 3 1A 5 6 7 KEY P ART NO. NO. DESCRIPTION 1 41A4208 Chain spreader w/screws (1256R, 1246R) 1A 31D380 Sprocket cover (all other models) 2 41C4206A Ge ...

  • Chamberlain 1255R - 1/2HP - page 39

    39 LOCK LIGHT L O C K L IG H T C LO S E D O P E N ACCESSORIES 973LM 974LM 995LM 1708LM 41A5281 1702LM Outside Quick Release: Required for a garage with NO access door . Enables homeowner to open garage door manually from outside by disengaging trolley . 8 Foot (2.4 m) Complete Rail: T o allow an 8 foot (2.4 m) door to open fully . Remote Light Cont ...

  • Chamberlain 1255R - 1/2HP - page 40

    © 2004, The Chamberlain Group, Inc. 1 14A2217K All Rights Reserved Printed in Mexico LIFTMASTER SER VICE IS ON CALL OUR LARGE SERVICE ORGANIZA TION SP ANS AMERICA INST ALLA TION AND SERVICE INFORMA TION IS AS NEAR AS YOUR TELEPHONE SEVEN DA YS A WEEK. SIMPL Y DIAL OUR TOLL FREE NUMBER: 1-800-528-2817 HOURS: (Central Standard Time) 6:00 A.M. TO 7:0 ...

Manufacturer Chamberlain Category Garage Door Opener

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All of them are important, but the most important information from the point of view of use of the device are in the user manual Chamberlain 1255R - 1/2HP.

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