Chamberlain 3255M 1/2 HP - Manuals

5 Your garage door opener is packaged in two cartons which contain the motor unit and all parts illustrated below. Accessories will depend on the model purchased. If anything is missing, carefully check the packing material. Parts may be stuck in the foam. Hardware for installation is also listed be...

6 ASSEMBLY STEP 1 Attach the Rail to the Motor Unit To avoid installation difficulties, do not run the garage door opener until instructed to do so. • Remove the two washered bolts mounted in top of motor unit. • Position rail at a 45 ˚ angle to opener so one hole in rail and motor unit line up. • T...

7 Lock Washer Inner Nut Trolley Chain Base of Rail 1/2" (13 mm) Outer Nut Mid Length of Rail To Tighten Outer Nut To Tighten Inner Nut INSTALLATION ASSEMBLY STEP 3 Tighten the Chain • Spin the inner nut and lock washer down the trolley threaded shaft, away from the trolley. • To tighten the chai...

8 INSTALLATION STEP 1 Determine the Header Bracket Location Installation procedures vary according to garage door types. Follow the instructions which apply to your door.1. Close the door and mark the inside vertical centerline of the garage door. 2. Extend the line onto the header wall above the do...

9 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, u...

10 Clevis Pin5/16"x2-3/4" Ring Fastener INSTALLATION STEP 3 Attach the Rail to the Header Bracket • Position the opener on the garage floor below the header bracket. Use packing material as a protective base. NOTE: If the door spring is in the way you’ll need help. Have someone hold the open...

11 ONE-PIECE DOOR WITHOUT TRACK A 2x4 on its side is convenient for setting an ideal door-to-rail distance. • Remove foam packaging.• Raise the opener onto a stepladder. You will need help at this point if the ladder is not tall enough. • Open the door all the way and place a 2x4 on its side on the ...

12 INSTALLATION STEP 5 Hang the Opener Three representative installations are shown. Yours may be different. Hanging brackets should be angled (Figure 1) to provide rigid support. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural supports before installing the...

13 LOCK LIGHT KG 1 3 9 7 5 KG 1 3 9 7 5 To prevent possible SERIOUS INJURY or DEATH from electrocution:• Be sure power is NOT connected BEFORE installing door control. • Connect ONLY to 24 VOLT low voltage wires.To prevent possible SERIOUS INJURY or DEATH from a closing garage door:• Install door co...

14 INSTALLATION STEP 7 Install the Light • Press the release tabs on both sides of lens. Gently rotate lens back and downward until the lens hinge is in the fully open position. Do not remove the lens. • Install a 100 watt maximum light bulb in each socket. Light bulb size should be A19, standard ne...

15 INSTALLATION STEP 9 Electrical Requirements To avoid installation difficulties, do not run the opener at this time. To reduce the risk of electric shock, your garage door opener has a grounding type plug with a third grounding pin. This plug will only fit into a grounding type outlet. If the plug...

16 Invisible Light BeamProtection Area Safety Reversing Sensor6" (15 cm) max. above floor Safety Reversing Sensor6" (15 cm) max. above floor Facing the door from inside the garage INSTALLATION STEP 10 Install The Protector System ® The safety reversing sensor must be connected and aligned co...

19 Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit. INSTALLATION STEP 11 Fasten the Door Bracket Follow instructions which apply to your door type as illustrated below or on th...

20 Header Wall VerticalCenterline ofGarage Door Finished Ceiling OptionalPlacementof DoorBracket Header Bracket DoorBracket 2x4 Support 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. METAL DOOR Top of Doo...

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. ...

23 ADJUSTMENT STEP 1 Adjust the UP and DOWN Travel Limits Limit adjustment settings regulate the points at which the door will stop when moving up or down.To operate the opener, press the Door Control push bar. Run the opener through a complete travel cycle.• Does the door open and close completely?...

24 ADJUSTMENT STEP 2 Adjust the Force Force adjustment controls are located on the back panel of the motor unit. Force adjustment settings regulate the amount of power required to open and close the door.If the forces are set too light, door travel may be interrupted by nuisance reversals in the dow...

25 Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. • Safety reversal system MUST be tested every month.• If one control (force or travel limits) is adjusted, the other control may also need adju...

26 OPERATION IMPORTANT SAFETY INSTRUCTIONS To reduce the risk of SEVERE INJURY or DEATH: Using Your Garage Door Opener Your Security ✚ ® opener and hand-held remote control have been factory-set to a matching code which changes with each use, randomly accessing over 100 billion new codes. Your opene...

27 To Open the Door Manually The door should be fully closed if possible. Pull down on the emergency release handle and lift the door manually. To reconnect the door to the opener, press the door control push bar. The lockout feature prevents the trolley from reconnecting automatically. Pull the eme...

28 CARE OF YOUR OPENER LIMIT AND FORCE ADJUSTMENTS: Weather conditions may cause some minor changes in door operation requiring some re-adjustments, particularly during the first year of operation.Pages 23 and 24 refer to the limit and force adjustments. Only a screwdriver is required. Follow the in...

30 Bell Wire Safety Reversing Sensor DiagnosticsLocated On Motor Unit LED or Diagnostic LED "Learn" Button Installed Safety Reversing Sensor Your garage door opener is programmed with self-diagnostic capabilities. The “Learn” button/diagnostic LED will flash a number of times then pause sign...

31 *3-Button Remotes If provided with your garage door opener, the large button is factory programmed to operate it. Additional buttons on any Security ✚ ® 3-Button remote or compact remote can be programmed to operate other Security ✚ ® garage door openers. To Erase All Codes From Motor Unit Memory...

32 1. Enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold ENTER. 2. While holding the ENTER button, press and hold the LIGHT button on the door control. 3. Continue holding the ENTER and LIGHT buttons while you press the push bar on the door cont...

33 1 3 4 5 6 2 REPAIR PARTS Rail Assembly Parts KEY PART NO. NO. DESCRIPTION 1 4A1008 Master link kit 2 41A4813 Chain pulley bracket 3 41A3489 Complete trolley assembly 4 1707LM One-piece rail 1708LM 8 ft. (2.4 m) complete rail 1710LM 10 ft. (3 m) complete rail 5 41D3484 Full chain assembly 6 83A11-...

34 Motor Unit Assembly Parts 2 10 8 13 14 15 19 4 5 3 9 16 12 18 11 17 1 6 7 DN UP BrownWire (Down)Contact LIMIT SWITCH ASSY. GreyWire YellowWire (Up)Contact Center LimitContact DriveGear KEY PART NO. NO. DESCRIPTION 1 31D380 Sprocket cover 2 41C4220A Gear and sprocket assembly Complete with: Spring...

35 ACCESSORIES CLOSED OPEN 374LM 370LM 395LM 41A5281 1702LM Outside Quick Release: Required for a garage with NO access door. Enables homeowner to open garage door manually from outside by disengaging trolley. Remote Light Control: Enables homeowner to turn on a lamp, television or other appliance f...

© 2010, The Chamberlain Group, Inc. 114A3588B All Rights Reserved LIFTMASTER ® ONE-YEAR LIMITED WARRANTY FOUR YEAR MOTOR LIMITED WARRANTY The Chamberlain Group, Inc. (“Seller”) warrants to the first retail purchaser of this product, for the residence in which this product is originally installed, th...