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Chamberlain 3245M 1/3 HP - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.liftmaster.com GARAGE DOOR OPENER Models 3245M 1/3 HP 3255M 1/2 HP 3255-2M 1/2 HP For Residential Use Only Owner’s Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■ The doo ...
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Chamberlain 3245M 1/3 HP - page 2
2 Introduction 2-5 Safety symbol and signal word review . . . . . . . . . . . . . . 2 Preparing your garage door . . . . . . . . . . . . . . . . . . . . . . . 3 Tools needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Carton inventory . ...
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Chamberlain 3245M 1/3 HP - page 3
3 To prevent damage to garage door and opener: • ALWAYS disable locks BEFORE installing and operating the opener. • ONLY operate garage door opener at 120V, 60 Hz to avoid malfunction and damage. To prevent possible SERIOUS INJURY or DEATH: • ALWAYS call a trained door systems technician if garage door binds, sticks or is out of balance. An u ...
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Chamberlain 3245M 1/3 HP - page 4
4 Planning Identify the type and height of your garage door. Survey your garage area to see if any of the conditions below apply to your installation. Additional materials may be required. You may find it helpful to refer back to this page and the accompanying illustrations as you proceed with the installation of your opener. Safety Reversing Senso ...
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Chamberlain 3245M 1/3 HP - page 5
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 below. Carton Inventory Straight Door Arm Section Cu ...
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Chamberlain 3245M 1/3 HP - page 6
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. • Thread one of the washered bolts part way in ...
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Chamberlain 3245M 1/3 HP - page 7
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 chain, turn outer nut in the direction shown (Fig ...
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Chamberlain 3245M 1/3 HP - page 8
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 door. You can fasten the header bracket within 4 fe ...
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Chamberlain 3245M 1/3 HP - page 9
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, use concrete anchors (not provided). WALL HEADER BR ...
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Chamberlain 3245M 1/3 HP - page 10
10 Clevis Pin 5/16"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 opener securely on a temporary support to allow ...
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Chamberlain 3245M 1/3 HP - page 11
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 top section of the door beneath the rail. ? ...
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Chamberlain 3245M 1/3 HP - page 12
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 opener. This bracket and fastening hardware are n ...
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Chamberlain 3245M 1/3 HP - page 13
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 control within sight of garage door, out of ...
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Chamberlain 3245M 1/3 HP - page 14
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 neck only. The lights will turn ON and remain li ...
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Chamberlain 3245M 1/3 HP - page 15
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 doesn’t fit into the outlet you have, contact a ...
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Chamberlain 3245M 1/3 HP - page 16
16 Invisible Light Beam Protection Area Safety Reversing Sensor 6" (15 cm) max. above floor Safety Reversing Sensor 6" (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 correctly before the garage door opener will m ...
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Chamberlain 3245M 1/3 HP - page 17
17 DOOR TRACK MOUNT (RIGHT SIDE) Indicator Light Lens Lip Door Track FLOOR MOUNT (RIGHT SIDE) WALL MOUNT (RIGHT SIDE) Indicator Light Lens Extension Bracket (See Accessories) Inside Garage Wall (Provided with Extension Bracket) (Provided with Extension Bracket) WALL MOUNT (RIGHT SIDE) Attach with Concrete Anchors (not provided) Inside Garage Wall L ...
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Chamberlain 3245M 1/3 HP - page 18
18 Invisible Light Beam Protection Area Safety Reversing Sensor Safety Reversing Sensor Connect Wire to Opener Quick-Connect Terminals Bell Wire Bell Wire Finished Ceiling 1. Strip wire 7/16" (11 mm) 2. Twist like colored wires together 7/16" (11 mm) Quick-Connect Terminals 3. To release or insert wire, push in tab with screwdriver tip Re ...
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Chamberlain 3245M 1/3 HP - page 19
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 the following page. A horizontal reinforcement brace ...
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Chamberlain 3245M 1/3 HP - page 20
20 Header Wall Vertical Centerline of Garage Door Finished Ceiling Optional Placement of Door Bracket Header Bracket Door Bracket 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 Door (Inside Garage) Door Bracket Optional ...
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Chamberlain 3245M 1/3 HP - page 21
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) ...
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Chamberlain 3245M 1/3 HP - page 22
22 ALL ONE-PIECE DOORS 1. Assemble the door arm, Figure 5: IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm (Figure 5). • Fasten the straight and curved door arm sections together to the longest possible length (with a 2 or 3 hole overlap). • With the door closed, connect the straight door arm section to th ...
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Chamberlain 3245M 1/3 HP - page 23
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? • Does the door stay closed and not reverse ...
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Chamberlain 3245M 1/3 HP - page 24
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 down direction and stops in the up direction. Weathe ...
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Chamberlain 3245M 1/3 HP - page 25
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 adjustment. • After ANY adjustments are made, t ...
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Chamberlain 3245M 1/3 HP - page 26
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 opener will operate with up to eight Security ✚ ® ...
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Chamberlain 3245M 1/3 HP - page 27
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 emergency release handle down and back (toward the op ...
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Chamberlain 3245M 1/3 HP - page 28
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 instructions carefully. Repeat the safety reverse t ...
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Chamberlain 3245M 1/3 HP - page 29
29 HAVING A PROBLEM? 1. My door will not close and the light bulbs blink on my motor unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction. • Verify the safety sensors are properly installed, aligned and free of any obstructions. Refer to Installation Step 10: Insta ...
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Chamberlain 3245M 1/3 HP - page 30
30 Bell Wire Safety Reversing Sensor Diagnostics Located 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 signifying it has found a potential issue. Cons ...
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Chamberlain 3245M 1/3 HP - page 31
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 To deactivate any unwanted remote, first er ...
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Chamberlain 3245M 1/3 HP - page 32
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 control (all three buttons are held). 4. Release butto ...
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Chamberlain 3245M 1/3 HP - page 33
33 1 3 4 5 6 2 REPAIR PARTS Rail Assembly Parts KEY P ART 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 83A11-2 Rail grease 7 UP CEILING M O UN T O N L Y 9 10 ...
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Chamberlain 3245M 1/3 HP - page 34
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 Brown Wire (Down) Contact LIMIT SWITCH ASSY. Grey Wire Yellow Wire (Up) Contact Center Limit Contact Drive Gear KEY PART NO. NO. DESCRIPTION 1 31D380 Sprocket cover 2 41C4220A Gear and sprocket assembly Complete with: Spring washer, thrust washer, retaining ring, bea ...
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Chamberlain 3245M 1/3 HP - page 35
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 from their car with their garage door opener remote ...
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Chamberlain 3245M 1/3 HP - page 36
© 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, that it is free from defect in materials and/o ...
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