Chamberlain 3255-2M 1/2 HP, 3245M 1/3 HP Connect Door Arm to Trolley, Sectional Doors only

Page 21

INSTALLATION STEP 12

Connect Door Arm to Trolley

Follow instructions which apply to your door type as illustrated below and on the following page.

SECTIONAL DOORS ONLY

Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley back (away from the door) about 2" (5 cm) as shown in Figures 1, 2 and 3.

Figure 1:

•Fasten straight door arm section to outer trolley with the 5/16"x1" clevis pin. Secure the connection with a ring fastener.

•Fasten curved section to the door bracket in the same way, using the 5/16"x1-1/4" clevis pin.

IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm (Figure 4).

Figure 2:

•Bring arm sections together. Find two pairs of holes that line up and join sections. Select holes as far apart as possible to increase door arm rigidity.

Figure 3, Hole alignment alternative:

•If holes in curved arm are above holes in straight arm, disconnect straight arm. Cut about 6" (15 cm) from the solid end. Reconnect to trolley with cut end down as shown.

•Bring arm sections together.

•Find two pairs of holes that line up and join with bolts, lock washers and nuts.

Pull the emergency release handle toward the opener at a 45° angle so that the trolley release arm is horizontal. Proceed to Adjustment Step 1, page 23. Trolley will re-engage automatically when opener is operated.

HARDWARE SHOWN ACTUAL SIZE

 

Nut 5/16"-18

Lock Washer 5/16"

Ring Fastener

 

Clevis Pin

Clevis Pin

 

Hex Bolt

5/16"x1" (Trolley)

5/16"x1-1/4" (Door Bracket)

5/16"-18x7/8"

Figure 1

Inner Trolley

 

 

Outer Trolley

Clevis Pin

Ring5/16"x1"

Fastener

 

Emergency

 

Release

Door

Handle

Bracket

Straight

 

 

Door Arm

 

Curved

Clevis Pin

Door Arm

 

5/16"x1-1/4"

 

Figure 2

Lock Washers 5/16"

Nuts 5/16"-18

Bolts 5/16"-18x7/8"

Door Bracket

Figure 3

 

 

Lock

 

 

Washers

 

 

5/16"

 

Nuts

 

 

5/16"-18

 

 

 

Bolts

 

 

5/16"-18x7/8"

 

 

Cut This End

Figure 4

CORRECT

INCORRECT

 

 

 

Straight

Straight

 

Door Arm

Door Arm

 

Curved

Curved

 

Door

(Groove

Door

Arm

Arm

facing out)

 

 

 

21

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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 HardwareAssembly Step Attach the Rail to the Motor UnitBolt 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

3255M 1/2 HP, 3245M 1/3 HP, 3255-2M 1/2 HP specifications

The Chamberlain 3255-2M, 3245M, and 3255M garage door openers stand out in the market for their reliability and superior performance. Each model offers a unique combination of power and features, catering to different needs and preferences.

The Chamberlain 3255-2M is a robust 1/2 HP opener designed for heavy residential garage doors. Its powerful motor ensures smooth and efficient operation, making it ideal for doors weighing up to 7 feet high. This model incorporates the latest in opening technology, including a durable chain drive mechanism that provides strength and longevity. One of its significant features is the incorporated MyQ technology, enabling users to control their garage door remotely through a smartphone app. This innovative feature brings convenience and peace of mind, as homeowners can check the status of the door from anywhere.

Another excellent choice is the Chamberlain 3245M, a 1/3 HP model that offers a balance of performance and affordability. It is suitable for lighter doors, providing consistent and reliable opening and closing. The 3245M model also boasts a protective cover that enhances its durability against the elements. It operates quietly thanks to its direct drive system, making it an excellent option for garages attached to living spaces. Like the 3255-2M, this model is also equipped with MyQ technology, allowing users to monitor and control their garage door from their smartphones seamlessly.

Finally, the Chamberlain 3255M, another 1/2 HP opener, offers similar features to the 3255-2M but with a focus on belt drive technology. This model is built for quieter performance, making it ideal for homes where noise is a concern. The belt drive reduces vibrations and sound, ensuring a smoother user experience. This model also comes with a battery backup system, which provides added security during power outages.

All these models emphasize safety and security, featuring auto-reverse functionality that senses obstacles and prevents the door from closing on them. The Chamberlain garage door openers are also equipped with a rolling code technology that changes the access code each time the remote is used, enhancing security against unauthorized access.

In summary, the Chamberlain 3255-2M, 3245M, and 3255M garage door openers cater to a variety of needs with their powerful motors, innovative technologies, and user-friendly features. Their reliability and performance make them an excellent investment for any homeowner.
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