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Chamberlain WD912K - page 1
Owner’s Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■ The door WILL NOT CLOSE unless The Protector System ® is connected and properly aligned. ■ Periodic checks of the opener are required to ensure safe operation. ■ The model number label is ...
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Chamberlain WD912K - page 2
2 Introduction 2-7 Safety symbol and signal word review ........................2 Preparing your garage door ........................................3 T ools needed ...............................................................3 Planning ..................................................................4-5 Carton inventory ........................ ...
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Chamberlain WD912K - page 3
3 To prevent damage to garage door and opener: •A LW AY S disable locks BEFORE installing and operating the opener . • ONL Y operate garage door opener at 120V , 60 Hz to avoid malfunction and damage. To prevent possible SERIOUS INJURY OR DEA TH: •A LW AY S call a trained door systems technician if garage door binds, sticks, or is out of bala ...
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Chamberlain WD912K - page 4
Safety Reversing Sensor Support bracket & fastening hardware is required. See page 17. — — — — — — — — Header Wall FINISHED CEILING Torsion Spring Extension Spring OR Safety Reversing Sensor Gap between floor and bottom of door must not exceed 1/4" Access Door Wall- mounted Door Control Horizontal and vertical reinforcement ...
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Chamberlain WD912K - page 5
Access Door Gap between floor and bottom of door must not exceed 1/4" Safety Reversing Sensor Safety Reversing Sensor CLOSED POSITION Header Bracket Belt Pulley Bracket Door Bracket Straight Door Arm Curved Door Arm Trolley Emergency Release Rope & Handle Rail Garage Door Belt Header Wall 5 Planning (Continued) ONE-PIECE DOOR INST ALLA TIO ...
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Chamberlain WD912K - page 6
6 SECURITY ✚ Multi-Function Remote Control Transmitter (2) 2-Conductor Bell Wire White & White/Red Trolley Header Bracket Belt Curved Door Arm Section Safety Labels and Literature Rail Brace (3) Rail Center Section (2) Rail End Section (2) Straight Door Arm Section Hanging Brackets U P C E I L I N G M O U N T O N L Y Multi-Function Door Contr ...
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Chamberlain WD912K - page 7
Hardwar e Inventor y Separate all hardware and group as shown below for the assembly and installation procedures. 7 Lock Washer 5/16" (4) Trolley Clip (1) Lock Nut 1/4"-20x7/16" (12) Nut 5/16"-18 (4) Washered Bolt 5/16"-18x1/2" (2) (mounted in motor unit) Carriage Bolt 1/4"-20x1/2" (12) Master Link (2) Trolle ...
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Chamberlain WD912K - page 8
8 ASSEMBL Y STEP 1 Assemble the Rail and Attach the Belt Pulley Bracket To avoid installation difficulties, do not run the garage door opener until instructed to do so. 1. Align the four rail sections on a flat surface exactly as shown . Center sections are interchangeable. Front and back sections are also interchangeable for ease of assembly . 2. ...
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Chamberlain WD912K - page 9
9 ASSEMBL Y STEP 2 Install the T rolley • As a temporary stop, insert a screwdriver into the hole in the front end of the rail. • Slide the trolley assembly along the rail to the screwdriver stop. NOTE: If trolley hits against any nuts on the rail, the bolts and nuts were attached from the wrong side and must be repositioned. Review Assembly St ...
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Chamberlain WD912K - page 10
10 ASSEMBL Y STEP 4 Install the Belt and Set the T ension INST ALLING THE BEL T 1. Drop the notched side of the trolley clip into the retaining slot on top of the trolley (Figure 1). 2. Grasp the clip connector at the end of the belt and slip it through the belt pulley bracket from behind, around the pulley and toward the trolley . 3. Fasten the be ...
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Chamberlain WD912K - page 11
ASSEMBL Y STEP 5 Attach the Belt Cap Retainer • Position the belt cap retainer over the motor unit sprocket so the two holes in cap align with the two holes in mounting plate. Attach with 8x3/8" hex screws provided. Y ou have now finished assembling your garage door opener . Please read the following warnings before proceeding to the install ...
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Chamberlain WD912K - page 12
12 INST ALLA TION STEP 1 Determine the Header Bracket Location Installation procedures vary according to garage door types. Follow the instructions which apply to your door . SECTIONAL DOOR AND ONE-PIECE DOOR WITH TRACK 1. Close the door and mark the inside vertical centerline of the garage door . 2. Extend the line onto the header wall above the d ...
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Chamberlain WD912K - page 13
13 Header Wall Vertical Centerline Vertical Centerline of Garage Door 2x4 Unfinished Ceiling 2x4 OPTIONAL CEILING MOUNT FOR HEADER BRACKET Structural Supports ONE-PIECE DOOR WITHOUT TRACK 1. Close the door and mark the inside vertical centerline of your garage door . Extend the line onto the header wall above door , as shown. If headroom clearance ...
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Chamberlain WD912K - page 14
14 INST ALLA TION STEP 2 Install the Header Bracket Y ou 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). W ALL HE ...
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Chamberlain WD912K - page 15
15 INST ALLA TION 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 the rail to clear the spring. • Position th ...
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Chamberlain WD912K - page 16
16 ONE-PIECE DOOR WITHOUT TRACK A 2x4 on its side is convenient for setting an ideal door-to-rail distance. • Raise the opener onto a stepladder . Y ou 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 beneath the rail. • The top of the door should be leve ...
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Chamberlain WD912K - page 17
17 INST ALLA TION STEP 5 Hang the Opener T wo representative installations are shown. Y ours may be different. Hanging brackets should be angled (Figure 1) to provide rigid support. On finished ceilings (Figure 2), attach a sturdy metal bracket to structural supports before installing the opener . This bracket and fastening hardware are not provide ...
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Chamberlain WD912K - page 18
18 L O C K L IG H T Figure 4 REMOVE COVER INST ALLA TION STEP 6 Install the Door Control Locate door control within sight of the door at a minimum height of 5 feet where small children cannot reach, and away from moving parts of the door and door hardware. The installation surface must be smooth and flat. If installing into drywall (Figure 1), dril ...
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Chamberlain WD912K - page 19
19 INST ALLA TION STEP 7 Install the Lights • 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 up to a 100 watt maximum light bulb in each socket. The lights will turn ON and remain lit for approximately 4-1/2 minutes when pow ...
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Chamberlain WD912K - page 20
20 INST ALLA TION 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, cont ...
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Chamberlain WD912K - page 21
21 Invisible Light Beam Protection Area Sensor Beam 6" max. above floor Sensor Beam 6" max. above floor Facing the door from inside the garage INST ALLA TION STEP 10 Install The Protector System ® The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction. IMPORT ANT ...
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Chamberlain WD912K - page 22
22 FLOOR MOUNT (RIGHT SIDE) WALL MOUNT (RIGHT SIDE) DOOR TRACK MOUNT (RIGHT SIDE) Indicator light Lens Lip Sensor Bracket Door Track Sensor Bracket Extension Bracket (See Accessories) Lens Indicator light Attach with concrete anchors (not provided) Inside G arage W all Indicator light Sensor Bracket Lens Extension Bracket (See Accessories) Inside G ...
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Chamberlain WD912K - page 23
23 Carriage bolt 1/4"-20x1/2" Lens Wing nut Figure 4 TROUBLESHOOTING THE SAFETY SENSORS 1. If the sending eye indicator light does not glow steadily after installation, check for: • Electric power to the opener . •A short in the white or white/black wires. These can occur at staples, or at opener connections. • Incorrect wiring betw ...
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Chamberlain WD912K - page 24
24 INST ALLA TION 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 should be long enough to be secured to two or three vertical supports. A vertical reinforcement brace should cover the height of the top panel. Figure 1 shows one piece o ...
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Chamberlain WD912K - page 25
25 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. MET AL DOOR Top of Door (Inside Garage) Door Bracket Optional ...
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Chamberlain WD912K - page 26
26 INST ALLA TION STEP 12 Connect Door Arm to T rolley Follow instructions which apply to your door type as illustrated below and on the following page. SECTIONAL DOORS ONL Y • 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 t ...
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Chamberlain WD912K - page 27
27 ALL ONE-PIECE DOORS 1. Assemble the door arm, Figure 4: • 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 the door bracket with the 5/16"x1-1/4" clevis pin. • Secure with a ring fastener . 2. Adj ...
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Chamberlain WD912K - page 28
28 ADJUSTMENT STEP 1 Adjust the UP and DOWN T ravel 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 reve ...
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Chamberlain WD912K - page 29
29 ADJUSTMENT STEP 2 Adjust the Force Force adjustment controls are located on the right 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. Weat ...
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Chamberlain WD912K - page 30
Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSL Y 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, th ...
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Chamberlain WD912K - page 31
OPERA TION 31 IMPORT ANT SAFETY INSTRUCTIONS To reduce the risk of severe injury or death: Using Y our Garage Door Opener Y our 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. Y our opener will operate with up to eight Security ✚ ...
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Chamberlain WD912K - page 32
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 . T o 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 ...
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Chamberlain WD912K - page 33
33 Care of Y our Opener LIMIT AND FORCE ADJUSTMENTS: W eather conditions may cause some minor changes in door operation requiring some readjustments, particularly during the first year of operation. Pages 28 and 29 refer to the limit and force adjustments. Only a screwdriver is required. Follow the instructions carefully . Repeat the safety reverse ...
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Chamberlain WD912K - page 34
34 Having a Problem? (Continued) 6. The garage door opens and closes by itself: • Be sure that all remote control push buttons are off. • Remove the bell wire from the door control terminals and operate from the remote only . If this solves the problem, the door control is faulty (replace), or there is an intermittent short on the wire between ...
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Chamberlain WD912K - page 35
35 LO C K L I G H T *Multi-Function Remotes If provided with your garage door opener , the large button is factory programmed to operate it. Additional buttons on any Security ✚ multi-function remote or mini-remote can be programmed to operate other Security ✚ garage door openers. To Erase All Codes From Motor Unit Memory To deactivate any unwa ...
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Chamberlain WD912K - page 36
36 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 Multi-Function Door Control. 3. Continue holding the ENTER and LIGHT buttons while you press the push bar on the Multi-Function Door Control (all three butto ...
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Chamberlain WD912K - page 37
37 13 9 NOTICE 5 6 10 8 U P C E I L I N G M O U N T O N L Y 7 1 4 3 2 L O C K L IG H T 11 12 2 1 3 3 5 4 5 8 9 10 6 7 Installation Parts REP AIR P ARTS Rail Assembly Parts KEY P ART NO. NO. DESCRIPTION 1 4A1008 Master link kit 2 41B3869-1 Complete trolley assembly 3 183B1 12 Rail braces (each) 4 183B1 1 1 Rail – center sections (each) 5 183B1 13 ...
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Chamberlain WD912K - page 38
Motor Unit Assembly Parts 38 DN UP Brown Wire (Down) Contact LIMIT SWITCH ASSY. Grey Wire Yellow Wire (Up) Contact Center Limit Contact Drive Gear 2 4 3 7 1 12 15 7 5 8 9 17 19 18 6 10 11 16 13 14 KEY P ART NO. NO. DESCRIPTION 1 41A4371 Belt cap retainer 2 41A4885-5 Gear and sprocket assy ., Complete with: Spring washer; thrust washer; retaining ri ...
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Chamberlain WD912K - page 39
39 ACCESSORIES L O C K L IG H T C L O S E D O P E N 3-Button SECURITY ✚ Remote Control: Includes visor clip. SECURITY ✚ Keyless Entry: Enables homeowner to operate garage door opener from outside by entering a password on a specially designed keyboard. Also can add a temporary password for visitors or service persons. This temporary password ca ...
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Chamberlain WD912K - page 40
©2003, The Chamberlain Group, Inc. 1 14A2781 All Rights Reserved Printed in Mexico CHAMBERLAIN SER VICE IS ON CALL OUR LARGE SERVICE ORGANIZA TION SP ANS AMERICA INST ALLA TION AND SERVICE INFORMA TION IS AS NEAR AS YOUR TELEPHONE SEVEN DA YS A WEEK. SIMPL Y DIAL OUR TOLL FREE NUMBER: 1-800-528-9131 HOURS: (Central Std. Time) 5:00 A.M. TO 7:00 P . ...
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