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Chamberlain 1255-2R - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1 196 www .liftmaster .com GARAGE DOOR OPENER Models 1255-2R 1/2HP 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 unle ...
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Chamberlain 1255-2R - page 2
2 Introduction 2-5 Safety symbol and signal word review ........................2 Preparing your garage door ........................................3 T ools needed ...............................................................3 Planning .....................................................................4 Carton inventory ....................... ...
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Chamberlain 1255-2R - 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 ...
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Chamberlain 1255-2R - page 4
FI N ISHED CEILI N G S u pport b racket & fastening hard w are is re qu ired. See page 12. Slack in chain tension is normal w hen garage door is closed. Header W all Safety Re v ersing Sensor Safety Re v ersing Sensor Gap b et w een floor and b ottom of door m u st not exceed 1/4" (6 mm) Access Door W all-mo u nted Door Control Motor Unit ...
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Chamberlain 1255-2R - page 5
5 Y our garage door opener is packaged in two cartons which contain 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 installation is also listed below . Carton Inventor y SECURITY ✚ ® Single B ...
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Chamberlain 1255-2R - page 6
6 ASSEMBL Y STEP 1 Attach the Rail to the Motor Unit T o avoid installation difficulties, do not run the garage door opener until instructed to do so. • Remove the two washered bolts mounted in top of motor unit. • Position rail at a 45˚ angle to opener so one hole in rail and motor unit line up. • Thread one of the washered bolts part way i ...
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Chamberlain 1255-2R - page 7
7 Lock W asher T o Tighten Outer Nut Inner Nut T rolley Chain Base of Rail 1/2" (13 mm) T o Tighten Inner Nut Outer Nut Mid Length of Rail INST ALLA TION ASSEMBL Y STEP 3 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 s ...
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Chamberlain 1255-2R - page 8
8 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 withi ...
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Chamberlain 1255-2R - page 9
9 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 HEA ...
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Chamberlain 1255-2R - page 10
Header Bracket Chain Pulley Bracket T emporary Support Header W all Garage Door Clevis Pin 5/16"x2-3/4" Ring Fastener Header Bracket Chain Pulley Bracket Rail 10 Clevis Pin 5/16"x2-3/4" Ring Fastener INST ALLA TION STEP 3 Attach the T -Rail to the Header Bracket • Position the opener on the garage floor below the header bracke ...
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Chamberlain 1255-2R - page 11
Rail Door 2x4 is used to determine the correct mounting height from ceiling. Header Bracket T op of Door 2x4 is used to determine the correct mounting height from ceiling. 11 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 ...
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Chamberlain 1255-2R - page 12
Measure Distance Lag Screws 5/16"-18x1-7/8" Bolt 5/16"-18x7/8" Lock Washer 5/16" N ut 5/16"-18 Structural Supports Bracket ( N ot Provided) Lag Screws 5/16"-18x1-7/8" ( N ot Provided) Bolt 5/16"-18x7/8" Lock Washer 5/16" N ut 5/16"-18 FINISHED CEILING Hidden Support Bolt 5/16"-18x7/8& ...
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Chamberlain 1255-2R - page 13
13 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 ...
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Chamberlain 1255-2R - page 14
14 INST ALLA TION STEP 8 Attach the Emergency Release Rope and Handle • Thread one end of the rope through the hole in the top of the red handle so “ N OTICE” reads right side up as shown. Secure with an overhand knot at least 1" (2.5 cm) from the end of the rope to prevent slipping. • Thread the other end of the rope through the hole ...
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Chamberlain 1255-2R - page 15
15 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, conta ...
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Chamberlain 1255-2R - page 16
16 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 ...
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Chamberlain 1255-2R - page 17
17 DOOR TRACK MOUNT (RIGHT SIDE) Indicator Light Lens Lip Sensor Bracket Door Track FLOOR MOUNT (RIGHT SIDE) WALL MOUNT (RIGHT SIDE) Indicator Light Sensor Bracket Lens Extension Bracket (See Accessories) Inside G arage W all (Provided with Extension Bracket) (Provided with Extension Bracket) Figure 1 Figure 2 Figure 3 Figure 4 WALL MOUNT (RIGHT SI ...
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Chamberlain 1255-2R - page 18
18 Carriage Bolt 1/4"-20x1/2" Lens Wing N ut Figure 5 Figure 6 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 ext ...
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Chamberlain 1255-2R - page 19
19 Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit. WARN ING CAUTION WARN ING WARN ING INST ALLA TION STEP 11 Fasten the Door Bracket Follow instructions which apply to your door type as illustrated below or on the following p ...
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Chamberlain 1255-2R - page 20
20 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" ( N ot Provided) to fasten door bracket. MET AL DOOR Top of Door (Inside Garage) Door Bracket Option ...
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Chamberlain 1255-2R - page 21
21 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 1255-2R - page 22
22 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 ...
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Chamberlain 1255-2R - page 23
23 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 1255-2R - page 24
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. Weather ...
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Chamberlain 1255-2R - page 25
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, t ...
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Chamberlain 1255-2R - page 26
OPERA TION 26 IMPORT ANT SAFETY INSTRUCTIONS T o reduce the risk of SEVERE INJUR Y or DEA TH: 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 Securit ...
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Chamberlain 1255-2R - page 27
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 bar . The lockout feature prevents the trolley from reconnecting automatically . Pull the emergency release handle down and back (toward the ...
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Chamberlain 1255-2R - page 28
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 23 and 24 refer to the limit and force adjustments. Only a screwdriver is required. Follow the instructions carefully . Repeat the safety reverse tes ...
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Chamberlain 1255-2R - page 29
29 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 1255-2R - page 30
Bell W ire Safety Sensor KG KG 1 3 9 7 5 1 3 9 7 5 1 2 3 1 LED or Diagnostic LED "Learn" B u tton Diagnostics Located On Motor Unit 30 Installed Safety Sensor 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 found a pot ...
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Chamberlain 1255-2R - page 31
*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 1255-2R - page 32
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 1255-2R - page 33
1 3 4 5 6 2 33 REP AIR P ARTS Rail Assembly Parts KEY P ART NO. NO. DESCRIPTION 1 4A1008 Master link kit 2 41A4813 Chain pulley bracket 3 41A3489 Complete trolley assembly 4 1707LM One-piece rail 5 41D3484 Full chain assembly 6 83A1 1-2 Rail grease 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 KEY P ART NO. NO. DESCRIPTION 1 ...
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Chamberlain 1255-2R - page 34
34 2 10 8 13 14 15 16 19 4 3 DN UP Brown Wire (Down) Contact LIMIT SWITCH ASSY . Grey Wire Y ellow Wire (Up) Contact Center Limit Contact Drive Gear 9 20 16 12 18 11 17 3 1 5 6 7 KEY P ART NO. NO. DESCRIPTION 1 31D380 Sprocket cover 2 41C4220A Gear and sprocket assy . Complete with: Spring washer , thrust washer , retaining ring, bearing plate, rol ...
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Chamberlain 1255-2R - page 35
35 L O C K L IG H T C LO S E D OP E N ACCESSORIES 974LM 970LM 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 Complete Rail: T o allow an 8 foot door to open fully . Remote Light Control: Enables homeowner to tu ...
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Chamberlain 1255-2R - page 36
© 2004, The Chamberlain Group, Inc. 1 14A2648D 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 ...
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