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GARAGE DOOR OPENER
Model 1255GMR – 1/2HP
Model 1245GMR – 1/3HP
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 the Protector System
properly aligned.
Periodic checks of the opener are required to ensure safe operation.
The model number label is located on the front panel of your opener.
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 1255GMR – 1/2HP
Summary of Contents for Chamberlain 1255GMR – 1/2HP
- Page 1 The Chamberlain Group, Inc. A DUCHOSSOIS ENTERPRISE 845 Larch Avenue Elmhurst, Illinois 60126 Complies with UL 325 regulations effective January 1, 1993 ® GARAGE DOOR OPENER Model 1255GMR – 1/2HP Model 1245GMR – 1/3HP 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.
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Page 2: Table Of Contents
TABLE OF CONTENTS Introduction Pages 2-5 Adjustment Pages 24-26 Safety symbol and signal word review......2 Adjust the travel limits ..........24 Preparing your garage door ........3 Adjust the force ............25 Tools needed ...............3 Test the safety reversal system.........26 Planning ..............4 Test the Protector System ®... -
Page 3: Preparing Your Garage Door
Preparing your garage door WARNING Before you begin: To prevent possible SERIOUS INJURY OR DEATH: • Disable locks. • ALWAYS call a trained door systems technician if • Remove any ropes connected to garage door. garage door binds, sticks, or is out of balance. An unbalanced garage door may not reverse when •... -
Page 4: Planning
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 find it helpful to refer back to this page and the accompanying illustrations as you proceed with the installation of your opener. -
Page 5: Carton Inventory
Carton Inventory Your garage door opener is packaged in two cartons purchased. If anything is missing, carefully check the which contain the motor unit and all parts illustrated packing material. Parts may be stuck in the foam. below. Accessories will depend on the model Hardware for installation is also listed below. -
Page 6: Assembly Pages
CAUTION ASSEMBLY STEP 1 Attach the T-Rail to the Motor Unit To avoid serious damage to opener, ONLY use screws mounted in top of motor unit. To avoid installation difficulties, do not run the garage door opener until instructed to do so. •... -
Page 7: Tighten The Chain
ASSEMBLY STEP 3 Lock Washer Outer Nut Inner Nut Tighten the Chain To Tighten Outer Nut • Spin the inner nut and lock washer down the To Tighten threaded shaft, away from the trolley. Inner Nut • To tighten the chain, turn outer nut in the direction shown. -
Page 8: Determine The Header Bracket Location
INSTALLATION STEP 1 Determine the Header Bracket Finished Vertical Ceiling Location Centerline Header Structural Wall Supports WARNING To prevent possible SERIOUS INJURY or DEATH: • Header bracket MUST be RIGIDLY fastened to structural support on header wall or ceiling, otherwise garage door might not reverse when required. - Page 9 ONE-PIECE DOOR WITHOUT TRACK Unfinished 1. Close the door and mark the inside vertical Ceiling centerline of your garage door. Extend the line Structural onto the header wall above door, as shown. Supports Header Wall Vertical If headroom clearance is minimal, you can install Centerline the header bracket on the ceiling.
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Page 10: Install The Header Bracket
INSTALLATION STEP 2 Install the Header Bracket Wall Mounting Holes You can attach the header bracket either to the wall above the garage door, or to the ceiling. Follow the CEILING MOUNT ONLY The nail hole is for instructions which will work best for your particular positioning only. -
Page 11: Attach The T-Rail To The 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 Header Wall protective base. NOTE: If the door spring is in the way you’ll need help. Have someone hold the Header opener securely on a temporary support to allow Bracket... -
Page 12: Position The Opener
CAUTION INSTALLATION STEP 4 Position the Opener To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top section of door. Follow instructions which apply to your door type as illustrated. SECTIONAL DOOR OR ONE-PIECE DOOR WITH TRACK A 2x4 laid flat is convenient for setting an ideal door- to-rail distance. -
Page 13: Hang The Opener
WARNING INSTALLATION STEP 5 Hang the Opener To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to structural Two representative installations are shown. Yours supports of the garage. Concrete anchors MUST be used may be different. Hanging brackets should be angled if installing any brackets into masonry. -
Page 14: Install The Door Control
WARNING INSTALLATION STEP 6 Install the Door Control To prevent possible serious injury or death from electrocution: Locate door control within sight of the door at a • Be sure power is not connected before installing door minimum height of 5 feet where small children control. -
Page 15: Install The Light And Lens
INSTALLATION STEP 7 Install the Light and Lens INSTALL THE LIGHT • Install a 75 watt maximum light bulb in the socket. The light will turn ON and remain lit for Panel Screw approximately 4-1/2 minutes when power is Light Lens connected. -
Page 16: Electrical Requirements
WARNING INSTALLATION STEP 9 Electrical Requirements To prevent possible SERIOUS INJURY or DEATH from electrocution or fire: To avoid installation difficulties, do not run the • Be sure power is not connected to the opener, and opener at this time. disconnect power to circuit BEFORE removing cover to To reduce the risk of electric shock, your garage door establish permanent wiring connection. -
Page 17: Install The Protector System
WARNING INSTALLATION STEP 10 Install The Protector System ® • Be sure power is not connected to the garage door opener BEFORE installing the safety reversing sensor. The safety reversing sensor must be connected • To prevent SERIOUS INJURY or DEATH from a closing and aligned correctly before the garage door garage door: opener will move in the down direction. - Page 18 INSTALLING THE BRACKETS Figure 1 Be sure power to the opener is disconnected. DOOR TRACK MOUNT (RIGHT SIDE) Install and align the brackets so the sensors will face each other across the garage door, with the beam no Door higher than 6" above the floor. They may be installed Track in one of three ways, as follows.
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Page 19: Mounting And Wiring The Safety Sensors
MOUNTING AND WIRING THE SAFETY SENSORS Figure 4 • Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. Use wing nuts to fasten sensors to Wing nut brackets, with lenses pointing toward each other across the door. Be sure the lens is not obstructed by a bracket extension. -
Page 20: Fasten The Door Bracket
CAUTION INSTALLATION STEP 11 Fasten the Door Bracket To prevent damage to garage door, reinforce inside of door with angle iron both vertically and horizontally. Follow instructions which apply to your door type as illustrated below or on the following page. A horizontal reinforcement brace should be long Header enough to be secured to two or three vertical... - Page 21 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.
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Page 22: Connect Door Arm To Trolley
INSTALLATION STEP 12 Inner Trolley Connect Door Arm to Trolley Outer Trolley Follow instructions which apply to your door type as illustrated below and on the following page. Clevis Pin SECTIONAL DOORS ONLY 5/16"x1" Ring • Make sure garage door is fully closed. Pull the Fastener emergency release handle to disconnect the outer trolley from the inner trolley. -
Page 23: Connect The Door Arm To The Trolley
ALL ONE-PIECE DOORS 1. Assemble the door arm: • Fasten the straight and curved door arm sections Door together to the longest possible length (with a 2 Ring Bracket Fastener or 3 hole overlap). Nuts • With the door closed, connect the straight door Lock 5/16"-18 Washers... -
Page 24: Adjustment Pages
WARNING ADJUSTMENT STEP 1 Adjust the UP and DOWN Travel Without a properly installed safety reversal system, Limits persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage Limit adjustment settings regulate the points at which door. -
Page 25: Adjust The Force
WARNING ADJUSTMENT STEP 2 Adjust the Force Without a properly installed safety reversal system, persons (particularly small children) could be Force adjustment controls are located on the back SERIOUSLY INJURED or KILLED by a closing garage panel of the motor unit. Force adjustment settings door. -
Page 26: Test The Safety Reversal System
WARNING ADJUSTMENT STEP 3 Test the Safety Reversal System Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage TEST door. • With the door fully open, place a one-inch board •... -
Page 27: Operation Pages
OPERATION IMPORTANT SAFETY INSTRUCTIONS WARNING To reduce the risk of severe injury or death: 1. READ AND FOLLOW ALL WARNINGS AND 8. If one control (force or travel limits) is adjusted, the INSTRUCTIONS. other control may also need adjustment. 2. ALWAYS keep remote controls out of reach of children. 9. -
Page 28: Using The Wall-Mounted Door Control
Using the Wall-Mounted Door Control Press the button to open or close the door. Press again to reverse the door during the closing cycle or to stop the door while it's opening. PUSH BUTTON To Open the Door Manually WARNING •... -
Page 29: Care Of Your Garage Door Opener
Having a Problem? Care of Your Opener 1. The opener doesn't operate from either the LIMIT AND FORCE ADJUSTMENTS: Door Control or the remote control: Weather conditions may cause • Does the opener have electric power? Plug a lamp some minor changes in door into the outlet. - Page 30 Having a Problem? (Continued) 11. The door reverses for no apparent reason and opener lights blink for 5 seconds after 6. The garage door opens and closes by itself: reversing: • Be sure that all remote control push buttons are •...
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Page 31: Programming Pages
PROGRAMMING Your garage door opener has already been programmed at the factory to operate with your hand-held remote control. The door will open and close when you press the large push button. Below are instructions for programming your opener to operate with additional Security remote controls. -
Page 32: To Add Or Change A Keyless Entry Pin
To Add 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 MULTI-FUNCTION DOOR CONTROL NOTE: This method requires two people if the Keyless 1. -
Page 33: Repair Parts Pages
REPAIR PARTS Rail Assembly Parts PART DESCRIPTION 1A995 Master link kit 41A4813 Chain pulley bracket 41A3489 Complete trolley assembly 183B99 One-piece T-rail 41A3484 Chain and cable assembly 83A4 Rail grease Installation Parts KEY PART DESCRIPTION 41A4166 Door Control Button 41A5056-1GM Single-function remote control case (no circuit board) 10A20... -
Page 34: Motor Unit Assembly Parts
Motor Unit Assembly Parts LIMIT SWITCH ASSY. (Down) Contact Brown Wire Grey Wire Drive Gear Center Limit (Up) Yellow Contact Contact Wire PART PART DESCRIPTION DESCRIPTION 41A3666-8 Cover (Model 1255) 31D380 Sprocket cover 41A3666-9 Cover (Model 1245) 41C4220A Gear and sprocket assembly 41A2818 Limit switch drive &... -
Page 35: Accessories
ACCESSORIES SECURITY Single-Function Model 971GM Model 1702 Outside Quick Release: Remote Control: Required for a garage with NO Includes visor clip. access door. Model 972LM SECURITY 2-Channel Model 59 Outside Keylock: Remote Control: Opens the garage door Includes visor clip. automatically from outside when remote control is not handy. -
Page 36: Repair Parts And Service
GARAGE MASTER GARAGE DOOR OPENER ONE-YEAR LIMITED WARRANTY Chamberlain/Garage Master (“Seller”) warrants to the first retail purchaser of this product, for the residence in which this product is originally installed, that it will be free from any defect in materials and/or workmanship for a period of one year from the date of purchase.