Table of Contents
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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 Protector System
properly aligned
Periodic checks and adjustment of the opener are required to ensure safe
operation.
The model number label is located under the light lens on the front panel of
your opener.
Garage Door Opener
Owner's Manual
FOR RESIDENTIAL USE ONLY
MODEL 1255GM – 1/2HP
MODEL 1245GM – 1/3HP
The Chamberlain Group, Inc.
A DUCHOSSOIS ENTERPRISE
845 Larch Avenue
Elmhurst, Illinois 60126
Complies with UL 325
Regulations effective
January 1, 1993.
®
is connected and
®
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Table of Contents
Related Manuals for Chamberlain 1255GM
Summary of Contents for Chamberlain 1255GM
- Page 1 ® Garage Door Opener Owner's Manual FOR RESIDENTIAL USE ONLY MODEL 1255GM – 1/2HP MODEL 1245GM – 1/3HP 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 Protector System ®...
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Page 2: Table Of Contents
Contents Page Contents Page A review of safety alert symbols ....2 Electrical requirements ....16 You'll need tools . -
Page 3: You'll Need Tools
You'll Need Tools During assembly, installation and adjustment of the opener, instructions will call for hand tools shown below. Pencil Carpenter's Level Hack Saw Tape Measure Wire Cutters Drill Claw Hammer 3/16", 5/16" and 5/32" Drill Bits Pliers 1/2" and 7/16" Sockets Stepladder Screwdriver Adjustable End Wrench... -
Page 4: Illustration Of Sectional Door Installation
Before you begin, survey your garage area to see whether any of the conditions below apply to your installation. Sectional Door Installation FINISHED CEILING Support bracket & fastening hardware Horizontal and vertical reinforcement is required. is needed for lightweight garage doors See page 13. -
Page 5: Carton Inventory
Your garage door opener is packaged in two cartons which contain all parts illustrated below. If anything is missing, carefully check the packing material. Parts may be "stuck" in the foam. Hardware for assembly and installation is also listed below. Models 1255GM & 1245GM Remote Control Sprocket Cover... -
Page 6: Assembly Section: Pages
Assembly Section: Pages 6 – 7 Assembly Step 1 CAUTION Attach the T-rail to the Opener To fasten rail, use only those screws mounted in top of the opener. Failure to do so will cause serious damage to the opener. •... -
Page 7: Tighten The Chain And Cable
Assembly Step 2 Tighten the Chain Lock Outer Nut Washer • Spin the inner nut and lock washer down the Inner Nut threaded shaft, away from the trolley. To Tighten Outer Nut • To tighten the chain, turn outer nut in the direction To Tighten shown. -
Page 8: Installation Section: Pages
Installation Section: Pages 8 – 23 Installation Step 1 WARNING Determine Header Bracket Location If the header bracket is not rigidly fastened to Installation procedures vary according to garage a structural support on the header wall or door types. Follow the instructions which apply to ceiling, the safety reverse system may not your door. -
Page 9: One-Piece Door
ONE-PIECE Door Without Track Read the Safety Instructions on page 8. They also apply to doors without tracks. Unfinished Header Wall Ceiling Vertical Centerline • Close the door and mark the Structural inside vertical centerline of Supports your garage door. Extend the line onto the header wall above door. -
Page 10: Install The Header Bracket
You can attach the header bracket either to the Installation Step 2 wall above the garage door, or to the ceiling. Follow the instructions which will work best for Install the Header Bracket your particular requirements. Fasten the Header Bracket to the Wall •... -
Page 11: Attach T-Rail To Header Bracket
Installation Step 3 Attach the T-rail to the Header Bracket • Position the opener on the garage floor below the header bracket. Use packing material as a protective base. Header Wall If the door spring is in the way you'll need help. Header Have someone hold the opener securely on a Bracket... -
Page 12: Position The Opener
Installation Step 4 CAUTION Position the Opener To prevent damage to steel, aluminum, Follow instructions which apply to your door type fiberglass or glass panel doors, do not rest the as illustrated. opener on the door without using a 2x4. SECTIONAL Door &... -
Page 13: Hang The Opener
Installation Step 5 WARNING Hang the Opener The opener could fall and injure someone if it is not properly secured. Fasten the opener securely to structural supports of the garage. Two representative installations are shown. Yours may be different. Hanging brackets should be angled, Figure 1, to provide rigid support. -
Page 14: Install The Door Control
Installation Step 6 WARNING Install the Door Control Children operating or playing with a garage door opener can injure themselves or others. • Strip 1/4" of insulation from one end of the bell The garage door could close and cause wire;... -
Page 15: Install The Light And Lens
Installation Step 7 Install the Light and the Lens Install 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. •... -
Page 16: Electrical Requirements
Installation Step 9 WARNING Electrical Requirements To prevent electrocution or fire, installation and wiring must be in compliance with local To reduce the risk of electric shock, your garage electrical and building codes. door opener has a grounding type plug with a third grounding pin. -
Page 17: The Protector System
The Protector System ® Information you'll need before you begin the installation of the safety reversing sensor. The safety reversing sensor must be connected WARNING and aligned correctly before the garage door opener will move in the down direction. This is a required safety device and cannot be disabled. -
Page 18: Install The Safety Reversing Sensor
Figure 2 Installation Step 10 Garage WALL or DOOR TRACK Installation Install the Safety Reversing Sensor Mounting Bracket (Receiving and Sending Eyes) With Square Holes "C" Wrap Figures 2 , 3 and 4 show recommended assembly #10-32x3/8" of bracket(s) and "C" wrap based on the wall Screws #10-32 installation of the sensors on each side of the... - Page 19 • Insert the wire connector into each Figure 7 Safety Sensor sensor and push until you hear a Tab should be click, Figure 7. The white tab on the flush with back sensor should be flush with the back of connector of the connector.
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Page 20: Fasten Door Bracket (Sectional Door)
Installation Step 11 CAUTION Fasten Door Bracket To prevent damage to steel, aluminum, Follow instructions which apply to your door type fiberglass or glass panel doors, always as illustrated below or on page 21. reinforce the inside of the door both vertically and horizontally with angle iron. -
Page 21: Fasten Door Bracket (One-Piece Door)
All ONE-PIECE Door Installation Procedure Please read and comply with the warnings and reinforcement instructions on page 20. They apply to one-piece doors also. Header Wall — Finished Ceiling — 2x4 Support Header Bracket Horizontal and vertical Optional Door reinforcement is needed for Placement Bracket lightweight garage doors... -
Page 22: Connect Door Arm To Trolley (Sectional Door)
Installation Step 12 Connect Door Arm to Trolley Follow instructions which apply to your door type as illustrated below and on page 23. SECTIONAL Doors Only Make sure garage door is fully closed. Pull the manual release handle to disconnect the outer trolley from the inner trolley. - Page 23 All ONE-PIECE Doors Door Bracket Ring Assemble the Door Arm: Fastener Nuts Lock • Fasten the straight and curved door arm sections 5/16"-18 Washers together to the longest possible length (with a 2 or 5/16" 3 hole overlap). Clevis Pin Straight •...
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Page 24: Adjustment Section: Pages
Adjustment Section: Pages 24 – 26 Adjustment Step 1 WARNING Adjust the UP and DOWN Limits Do not make any limit adjustments until the Improper adjustment of the travel limits will Safety Reversing Sensors are completely interfere with the proper operation of the installed. -
Page 25: Force Adjustments
Adjustment Step 2 WARNING Adjust the Force Too much force on the door will interfere with the proper operation of the safety reverse system. The door might not reverse properly Force adjustment controls are located on the back when required and could seriously injure or panel of the opener. -
Page 26: Test The Protector System
Adjustment Step 3 WARNING ® Test The Protector System Without a properly working safety reversing sensor, persons (particularly children) could • Press the remote control push button to open be seriously injured or killed if trapped by a the door. closing garage door. -
Page 27: Operation Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS WARNING WARNING To reduce the risk of severe injury or death to persons: 1. READ AND FOLLOW ALL INSTRUCTIONS. 2. Do not permit children either to operate or to play with the opener. Keep remote control in a location inaccessible to children. -
Page 28: Operation Of Your Opener
Operation of Your Opener Activate the opener with any of the following WARNING devices: • The Remote Control Transmitter. Hold push button down until the door starts to move. Weak or broken springs could allow an open • The Door Control. Hold button down until the door to fall (either rapidly or unexpectedly), resulting in serious injury, death or property door starts to move. -
Page 29: Receiver And Remote Control Programming
Receiver and Remote Control Programming NOTICE: To comply with FCC rules, adjustment or modification of this WARNING receiver and/or transmitter are prohibited, except for changing the code setting or replacing the transmitter battery. THERE ARE NO OTHER USER SERVICEABLE PARTS. Children operating or playing with a garage door opener can injure themselves or others. -
Page 30: Having A Problem
Having a Problem? Situation Probable Cause & Solution 1. Does the opener have electric power? Plug a lamp into the outlet. If it doesn't light, The opener doesn't check the fuse box or the circuit breaker. (Some outlets are controlled by a wall switch.) operate from either the door control or 2. - Page 31 Having a Problem? (continued) Situation Probable Cause & Solution The door opens but 1. If the opener lights blink, check the safety reversing sensor. See page 19. won't close: 2. If the opener lights do not blink and it is a new installation, check the down force. See Adjustment Step 2, page 25.
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Page 32: Repair Parts, Rail Assembly
Repair Parts Rail Assembly Parts PART DESCRIPTION 1A995 Master link kit 41B2616 Cable pulley bracket 41A3489 Complete trolley assembly 183B99 One-piece T-rail 41A3473 Chain and cable assembly 83A4 Rail grease Installation Parts PART DESCRIPTION 41A4166 Lighted door control button 10A14 12V battery 29C128 Remote control visor clip... -
Page 33: Repair Parts, Opener Assembly
Repair Parts Opener Assembly Parts LIMIT SWITCH ASSY. (Down) Contact Brown Wire Grey Wire Drive Gear Center Limit (Up) Yellow Contact Contact Wire 0KEY PART PART DESCRIPTION DESCRIPTION 41D3058 Universal replacement motor 31D380 Sprocket cover & bracket assembly 41C4220A Gear and sprocket assembly (All other Complete with: Motor, worm, models) bracket, bearing assembly, RPM... -
Page 34: Accessories
Accessories Available For Your Opener Outside Quick Release: Model 1702 Model 81LM "Smart" Remote Control: Required for a garage with NO Includes visor clip. access door. Model 60 Outside Keylock: Model 61LM Single-Function Standard Size Opens the garage door Remote Control: automatically from outside when Includes visor clip. -
Page 35: Index
Index Access Door/Outside Key Release Accessory ...................31, 34 Chain Tension ..............................4, 7, 31 Electrical Safety Warnings........................2, 7, 16, 27 Garage Door Testing for balance, binding and sticking....................3, 25, 27 Determining high point of travel: Sectional door..............................8 One-piece door ...............................8, 9 Disabling existing locks............................3, 7 Force controls Adjustment procedures.............................25... -
Page 36: How To Order Repair Parts
Garage Master's instructions for installation, operation and care. LIMITED WARRANTY ON MOTOR Model 1255GM: The motor is warranteed to be free from any defect in materials and/or workmanship for a period of 48 full months (4 years) from the date of purchase.