Liftmaster Chamberlain Garage Door Opener Transmitter 300MC

TM

The Chamberlain Group, Inc. A DUCHOSSOIS ENTERPRISE 845 Larch Avenue Elmhurst, Illinois 60126-1196 Complies with UL 325 regulations effective January 1, 1993

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Garage Door Opener Model 1000SDR 1/3 HP

Model 2000SDR 1/2 HP

For Residential Use Only

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Please read this manual and the enclosed safety materials carefully!

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Fasten the manual near the garage door after installation.

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The door WILL NOT CLOSE unless the Protector System® is connected and properly aligned.

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Periodic checks of the opener are required to ensure safe operation.

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The model number label is located on the back of your opener.

Contents Safety alert symbol review............................................2 Safety information and precautions ..............................3 Testing your garage door for binding & balance ..........3 Hardware supplied ........................................................3 Carton inventory ...........................................................4 Illustration of sectional door installation .....................5 Illustration of one-piece door installation .....................5 Assembly section - pages 6 – 7 Fasten rail to power unit..............................................6 Install the trolley .........................................................6 Attach the rail brackets ...............................................7 Installation safety instructions ....................................7 Installation section - pages 8 – 23 Determine the header bracket location Sectional door ...........................................................8 One-piece door..........................................................9 Install the header bracket ..........................................10 Attach the rail to the header bracket .........................11 The Protector System ® .............................................12 Install the safety reversing sensor .............................13 Position the opener....................................................15 Hang the opener ........................................................16 Install the door control and connect all wires ...........17 Electrical requirements .............................................18 Complete the safety reversing sensor installation.....18

Install the lights and lens ..........................................19 Attach the manual release rope and handle...............19 Fasten the door bracket (sectional door) ...................20 Fasten the 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, power unit ..............................................33 Accessories .................................................................34 Index ...........................................................................35 How to order repair parts ............................................36 Warranty......................................................................36

Start by reviewing these important safety alert symbols: When you see these Safety Symbols on the following pages, they will alert you to the possibility