Chamberlain 3255-2M 1/2 HP Install the Header Bracket, Wall Header Bracket Installation

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INSTALLATION STEP 2

Install the Header Bracket

You 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).

WALL HEADER BRACKET INSTALLATION

•Center the bracket on the vertical centerline with the bottom edge of the bracket on the horizontal line as shown (with the arrow pointing toward the ceiling).

•Mark the vertical set of bracket holes (do not use the holes designated for ceiling mount). Drill 3/16" pilot holes and fasten the bracket securely to a structural support with the hardware provided.

HARDWARE SHOWN ACTUAL SIZE

Lag Screw 5/16"-9x1-5/8"

Wall Mounting Holes

CEILING MOUNT ONLY

UP

Optional

Wall Mounting Holes

Header Wall

2x4Header

StructuralBracket

Support

Horizontal

Line

Highest Point of

Garage Door Travel

The nail hole is for positioning only. You must use lag screws to mount the header bracket.

Vertical

Centerline of

Garage Door

Lag Screws 5/16"-9x1-5/8"

Door Spring

Garage Door

Vertical

Centerline of

Garage Door

CEILING HEADER BRACKET INSTALLATION

•Extend the vertical centerline onto the ceiling as shown.

•Center the bracket on the vertical mark, no more than 6" (15 cm) from the wall. Make sure the arrow is pointing toward the wall. The bracket can be mounted flush against the ceiling when clearance is minimal.

•Mark the side holes. Drill 3/16" pilot holes and fasten bracket securely to a structural support with the hardware provided.

– Finished Ceiling –

			Vertical
	Header		Centerline of
	Header		Garage Door
	Bracket		Garage Door

6" (15 cm) Maximum

Door

Spring

Lag Screws 5/16"-9x1-5/8"

The nail hole is for positioning only. You must use lag screws to mount the header bracket.

Ceiling Mounting Holes

CEILING MOUNT ONLY

UP

Garage Door

– Header Wall –

Vertical

Centerline of

Garage Door

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Contents For Residential Use Only Garage Door OpenerIntroduction Table of ContentsTools needed Preparing your garage doorSectional Door One-Piece DoorPlanning Sectional Door InstallationONE-PIECE Door Without Track ONE-PIECE Door with TrackCarton Inventory Installation Hardware Assembly Step Attach the Rail to the Motor Unit Bolt previously removed from motor unit Tighten the Chain InstallationDetermine the Header Bracket Location Installation StepInstall the Header Bracket Wall Header Bracket InstallationCeiling Header Bracket Installation Attach the Rail to the Header Bracket Sectional Door or ONE-PIECE Door with Track Position the OpenerHang the Opener Standard installation only Run bell wire up wall Install the Door ControlAttach the Emergency Release Rope and Handle Install the LightElectrical Requirements Install The Protector System Important Information about Safety Reversing SensorFacing the door from inside the garage Garage door track installation preferred Installing the BracketsWall installation Floor installation FigureMounting and Wiring the Safety Reversing Sensors Troubleshooting the Safety ReversingAligning the Safety Reversing Sensors Fasten the Door Bracket Metal, insulated or light weight factory reinforced doorsSectional Doors Wood DoorsONE-PIECE Doors Sectional Doors only Connect Door Arm to TrolleyALL ONE-PIECE Doors Adjustment procedures, FigureAssemble the door arm, Figure Connect the door arm to the trolleyAdjust the UP and Down Travel Limits Adjustment StepIf door does not open at least 5 feet 1.5 m If the door does not close completelyHOW and When to Adjust the Forces Adjust the ForceTest the Down close force Test the UP open forceAdjust Test the Safety Reversal SystemImportant Safety Check Test The Protector SystemUsing Your Garage Door Opener OperationActivate your opener with any of the following Light feature Lock featureMULTI-FUNCTION Door Control Once a Month Care of Your OpenerTwice a Year Once a YearHaving a PROBLEM? Door control or wire shorted Safety reversing sensors wire open broken or disconnectedSymptom LED is not lit on door control Symptom Motor unit doesn’t operateUsing the Learn Button Using the Door Control To Add or Reprogram a Hand-held Remote ControlProgramming To Erase All Codes From Motor Unit MemoryTo Add, Reprogram or Change a Keyless Entry PIN To change an existing, known PINTo set a temporary PIN Repair Parts Rail Assembly PartsInstallation Parts Motor Unit Assembly Parts Complete with Spring washerComplete with Logic board Accessories Liftmaster Service is On Call