Chamberlain 3255M 1/2 HP, 3255-2M 1/2 HP, 3245M 1/3 HP owner manual ONE-PIECE Doors

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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.

Metal Doors: Drill 3/16" pilot holes and fasten the bracket with the 1/4"-14x5/8" self-threading screws provided.

Wood Doors: Drill 5/16" holes and use 5/16"x2" carriage bolts, lock washers and nuts (not provided) or 5/16"x1-1/2" lag screws (not provided) depending on your installation needs.

NOTE: The door bracket may be installed on the top edge of the door if required for your installation. (Refer to the dotted line optional placement drawing.)

HARDWARE SHOWN

ACTUAL SIZE

Self-Threading Screw 1/4"-14x5/8"

Header Wall

2x4 Support

Header

Bracket

Door

Bracket

Optional

Placement

of Door

Bracket

Vertical

Centerline of

Garage Door

Finished Ceiling

HORIZONTAL AND VERTICAL REINFORCEMENT IS NEEDED FOR LIGHTWEIGHT GARAGE DOORS (FIBERGLASS, ALUMINUM, STEEL, DOORS WITH GLASS PANEL, ETC.). (NOT PROVIDED)

For a door with no exposed framing, or for the optional installation, use lag screws 5/16"x1-1/2" (Not Provided) to fasten door bracket.

 

Self-Threading

 

Screw

Door

1/4"-14x5/8"

Top of Door

Bracket

(Inside

 

 

Garage)

 

Top Edge

 

of Door

 

Optional

 

Placement

 

METAL DOOR

Nut

Lock

5/16"-18

Washer

 

 

5/16"

Door

Top of Door

Bracket

(Inside

 

Garage)

 

Top Edge

 

of Door

 

Optional

 

Placement

 

Carriage Bolt

 

5/16"x2"

 

(Not Provided)

 

WOOD DOOR

20

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Contents Garage Door Opener For Residential Use OnlyTable of Contents IntroductionPreparing your garage door Tools neededSectional Door One-Piece DoorSectional Door Installation PlanningONE-PIECE Door Without Track ONE-PIECE Door with TrackInstallation Hardware Carton InventoryBolt previously removed from motor unit Assembly StepAttach the Rail to the Motor Unit Installation Tighten the ChainInstallation Step Determine the Header Bracket LocationCeiling Header Bracket Installation Install the Header BracketWall Header Bracket Installation Attach the Rail to the Header Bracket Position the Opener Sectional Door or ONE-PIECE Door with TrackHang the Opener Install the Door Control Standard installation only Run bell wire up wallInstall the Light Attach the Emergency Release Rope and HandleElectrical Requirements Facing the door from inside the garage Install The Protector SystemImportant Information about Safety Reversing Sensor Installing the Brackets Garage door track installation preferredWall installation Floor installation FigureAligning the Safety Reversing Sensors Mounting and Wiring the Safety Reversing SensorsTroubleshooting the Safety Reversing Metal, insulated or light weight factory reinforced doors Fasten the Door BracketSectional Doors Wood DoorsONE-PIECE Doors Connect Door Arm to Trolley Sectional Doors onlyAdjustment procedures, Figure ALL ONE-PIECE DoorsAssemble the door arm, Figure Connect the door arm to the trolleyAdjustment Step Adjust the UP and Down Travel LimitsIf door does not open at least 5 feet 1.5 m If the door does not close completelyAdjust the Force HOW and When to Adjust the ForcesTest the Down close force Test the UP open forceTest the Safety Reversal System AdjustImportant Safety Check Test The Protector SystemActivate your opener with any of the following Using Your Garage Door OpenerOperation MULTI-FUNCTION Door Control Light featureLock feature Care of Your Opener Once a MonthTwice a Year Once a YearHaving a PROBLEM? Safety reversing sensors wire open broken or disconnected Door control or wire shortedSymptom LED is not lit on door control Symptom Motor unit doesn’t operateTo Add or Reprogram a Hand-held Remote Control Using the Learn Button Using the Door ControlProgramming To Erase All Codes From Motor Unit MemoryTo set a temporary PIN To Add, Reprogram or Change a Keyless Entry PINTo change an existing, known PIN Installation Parts Repair PartsRail Assembly Parts Complete with Logic board Motor Unit Assembly PartsComplete with Spring washer 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.