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Start by reviewing these important safety alert symbols:

2

Contents

Page

A review of safety alert symbols  . . . . . . . . . . . . . .2
You'll need tools  . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety information (door locks and ropes) . . . . . . .3
Testing your garage door for sticking, 

binding and balance  . . . . . . . . . . . . . . . . . . . . . .3

Illustration of sectional door installation   . . . . . . . .4
Illustration of one-piece door installation  . . . . . . . .4
Carton inventory  . . . . . . . . . . . . . . . . . . . . . . . . . .5
Hardware inventory  . . . . . . . . . . . . . . . . . . . . . . . .5

Assembly Section - Pages 6 – 7

Fasten T-rail to opener  . . . . . . . . . . . . . . . . . . . .6
Attach chain to sprocket

and install sprocket cover  . . . . . . . . . . . . . . . . .6

Tighten the chain and cable  . . . . . . . . . . . . . . . .7

Installation Section - Pages 8– 23

Installation instruction warnings . . . . . . . . . . . . . .7
Determine header bracket location 

Sectional door . . . . . . . . . . . . . . . . . . . . . . . . . .8
One-piece door . . . . . . . . . . . . . . . . . . . . . . . . .9

Install header bracket  . . . . . . . . . . . . . . . . . . . .10
Attach T-rail to header bracket  . . . . . . . . . . . . .11
Position the opener  . . . . . . . . . . . . . . . . . . . . . .12
Hang the opener  . . . . . . . . . . . . . . . . . . . . . . . .13
Install the door control  . . . . . . . . . . . . . . . . . . . .14
Install the light and lens  . . . . . . . . . . . . . . . . . . .15
Attach manual release rope and handle  . . . . . .15

Contents

Page

Electrical requirements  . . . . . . . . . . . . . . . . . . .16
The Protector System

®

Safety reversing sensor information  . . . . . . . . .17
Install the safety reversing sensor  . . . . . . . . . . .18
Fasten door bracket (sectional door) . . . . . . . . .20
Fasten door bracket (one-piece door)  . . . . . . . .21
Connect door arm to trolley (sectional door)  . . .22
Connect door arm to trolley (one-piece door)  . .23

Adjustment Section - Pages 24 – 26

Travel limit adjustments . . . . . . . . . . . . . . . . . . .24
Force adjustments  . . . . . . . . . . . . . . . . . . . . . . .25
Test the Protector System

®

 . . . . . . . . . . . . . . . .26

Test the safety reverse system  . . . . . . . . . . . . .26

Operation safety instructions  . . . . . . . . . . . . . . . .27
Care of your opener . . . . . . . . . . . . . . . . . . . . . . .27
Maintenance schedule . . . . . . . . . . . . . . . . . . . . .27
Operation of your opener . . . . . . . . . . . . . . . . . . .28
Receiver & remote control programming . . . . . . .29
Having a problem?  . . . . . . . . . . . . . . . . . . . . . . .30
Repair parts, rail assembly  . . . . . . . . . . . . . . . . .32
Repair parts, installation  . . . . . . . . . . . . . . . . . . .32
Repair parts, opener assembly  . . . . . . . . . . . . . .33
Accessories  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
How to order repair parts . . . . . . . . . . . . . . . . . . .36
Warranty  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

When you see these safety symbols on the following pages, they will alert you to the possibility of
serious injuries or death if you do not comply with the corresponding instructions. The hazard may
come from something mechanical or from electric shock. 

Read the instructions carefully.

When you see this safety symbol on the following pages, it will alert you to the possibility of damage
to your garage door and/or the garage door opener if you do not comply with the corresponding
instructions. 

Read the instructions carefully.

This garage door opener is designed and tested to offer safe service provided it is installed, operated,
maintained and tested in strict accordance with the safety instructions contained in this manual.

Mechanical

Electrical

WARNING

WARNING

CAUTION

Summary of Contents for 1245GM

Page 1: ...tions effective January 1 1993 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 Protecto...

Page 2: ...door 22 Connect door arm to trolley one piece door 23 Adjustment Section Pages 24 26 Travel limit adjustments 24 Force adjustments 25 Test the Protector System 26 Test the safety reverse system 26 Ope...

Page 3: ...usly injured or killed If your garage door binds sticks or is out of balance call for professional garage door service Garage doors door springs cables pulleys brackets and their hardware are under ex...

Page 4: ...y Reversing Sensor Horizontal and vertical reinforcement is needed for lightweight garage doors fiberglass steel aluminum door with glass panels etc See page 20 for details FINISHED CEILING Support br...

Page 5: ...Styrofoam Trolley Chain Cable Cable Pulley Bracket Models 1255GM 1245GM Safety Reversing Sensor Installation Hardware Lag Screw 1 4x1 1 2 4 Hex Screw 1 4 20x1 1 2 2 Carriage Bolts 1 4 20x1 2 4 Screw 1...

Page 6: ...slot Squeeze the cover slightly and insert the front tab in the slot on the mounting plate Remove the two washered screws mounted in top of opener Position T rail at a 45 angle to opener so one hole...

Page 7: ...th Repairs to cables spring assemblies and other hardware must be made by a professional service person before installing opener 3 Disable all locks and remove all ropes connected to the garage door b...

Page 8: ...hen clearance is minimal It may be mounted on the wall upside down if necessary to gain approximately 1 2 If you need to install the header bracket on a 2x4 on wall or ceiling use lag screws not suppl...

Page 9: ...racket height on header wall 12 Measure UP from top of CLOSED door Proceed to Step 2 page 10 9 Header Wall Highest Point of Travel Door Distance Jamb Hardware Door Highest Point of Travel Header Wall...

Page 10: ...edge of the bracket on the horizontal line as shown with the arrow pointing toward the ceiling Mark either set of bracket holes do not use the holes designated for ceiling mount Drill 3 16 pilot hole...

Page 11: ...e packing material as a protective base If the door spring is in the way you ll need help Have someone hold the opener securely on a temporary support to allow the T rail to clear the spring Position...

Page 12: ...the floor it will be at a slight angle as shown The top of the door should be level with the top of the opener Do not position the opener more than 2 above this point Top of Opener Header Bracket Ste...

Page 13: ...e sure the T rail is centered over the door or in line with the header bracket if the bracket is not centered above the door Remove the 2x4 Operate the door manually If the door hits the rail raise th...

Page 14: ...es selon les proc dures d crites dans la notice 1 3 9 7 5 2 3 TO PROGRAM RECEIVER CODE FOR EACH REMOTE CONTROL 1 Press and HOLD remote control transmitter push button 2 Press receiver code button The...

Page 15: ...he release arm of the outer trolley Adjust rope length so the handle is 6 feet above the floor Secure with an overhand knot If it is necessary to cut the rope heat seal the cut end with a match or lig...

Page 16: ...ord Connect the black line wire to the screw on the brass terminal the white neutral wire to the screw on the silver terminal and the ground wire to the green ground screw The opener must be grounded...

Page 17: ...f wood at each location if installing in masonry construction The invisible light beam path must be unobstructed No part of the garage door or door tracks springs hinges rollers or other hardware can...

Page 18: ...nment of brackets for left and right sides of the door Finger tighten the lock nuts Use bracket mounting holes as a template to locate and drill 2 3 16 diameter pilot holes on both sides of the garage...

Page 19: ...n both units tighten the wing nut in the receiving eye unit 19 Push connector in until you hear a click Tab should be flush with back of connector Insert the wire connector into each sensor and push u...

Page 20: ...ng limits A The top edge of the bracket 2 4 below the top edge of the door B The top edge of the bracket directly below any structural support across the top of the door Mark and drill 5 16 left and r...

Page 21: ...enter the bracket on the top of the door in line with the header bracket as shown Mark holes Drill 5 16 pilot holes and fasten the door bracket with hardware supplied If the door has no exposed framin...

Page 22: ...crews 5 16 18x7 8 Manual Release Handle Rope Figure 3 If holes in curved arm are above holes in straight arm disconnect straight arm Cut about 6 from the solid end Reconnect to trolley with cut end do...

Page 23: ...to the floor and lift the door arm to the trolley The arm should touch the trolley just in back of the door arm connector hole Refer to the fully open trolley door arm positions in the illustration If...

Page 24: ...pen completely but opens at least five feet Increase up travel Turn the UP limit adjustment screw clockwise One turn equals 2 of travel If door does not open at least 5 feet Adjust the UP open force a...

Page 25: ...nt apr s tout r glage de la force de d clenchement ou des seuils de fin de course s assurer que le sens de la course s inverse lorsque la porte entre en contact avec un object de 13 mm 1 po de hauteur...

Page 26: ...d adjust as needed 26 Adjustment Step 3 Test The Protector System Press the remote control push button to open the door Place the opener carton in the path of the door Press the remote control push bu...

Page 27: ...force Care of Your Opener 27 IMPORTANT SAFETY INSTRUCTIONS 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...

Page 28: ...ntrol the Outside Keylock or Keyless Entry however if you activate them until down travel is complete If you release them too soon the door will reverse The opener lights will blink for 5 seconds when...

Page 29: ...ld the remote push button See Figure 1 2 Then press and release the green Smart button on the back panel of the opener in Figure 2 The opener light on the panel will flash once Now the opener will ope...

Page 30: ...e 5 Repeat the receiver programming procedure with all remote controls The remote control has short range The garage door opens and closes by itself 1 Be sure that all remote control push buttons and...

Page 31: ...l release to disconnect the trolley Open and close the door manually A properly balanced door will stay in any point of travel while being supported entirely by its springs If it does not disconnect t...

Page 32: ...984 10 Single function remote control housing screw no circuit board 5 41A2828 Manual rope handle assy 6 217A238 2 Conductor bell wire white white red 7 41A4353 Header bracket w clevis pin fastener 8...

Page 33: ...socket 7 108D36 Lens 8 30B363 Capacitor 1 2HP 30B387 Capacitor 1 3HP 9 12A373 Capacitor bracket 10 41A3150 Terminal block w screws KEY PART NO NO DESCRIPTION 11 41D3058 Universal replacement motor bra...

Page 34: ...te Rail To allow a 10 foot door to open fully Security Remote Control Enables homeowner to operate garage door opener by entering 2 3 4 or 5 digit code from backlit keyboard Includes visor clip 8 foot...

Page 35: ...0 31 Limit control safety warnings 24 27 Manual Emergency Release Rope Handle Lockout feature 28 Manual disconnect 28 31 Safety warnings 7 15 27 28 Opener Terminals Wall control connections 14 Safety...

Page 36: ...uild parts at Chamberlain s option THE DURATION OF IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS LIMITED TO THE DURATION OF THIS WRITTEN WARRANTY SOME STATES MAY NOT AL...

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