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Chamberlain CG40DM - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.chamberlain.com GARAGE DOOR OPENER Model CG40DM 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 door WILL NOT CLOSE unless The ...
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Chamberlain CG40DM - page 2
2 TABLE OF CONTENTS When you see these Safety Symbols and Signal Words on the following pages, they will alert you to the possibility of serious injury or death if you do not comply with the warnings that accompany them. The hazard may come from something mechanical or from electric shock. Read the warnings carefully. When you see this Signal Word ...
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Chamberlain CG40DM - 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 ...
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Chamberlain CG40DM - 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 fi nd it helpful to refer back to this page and the accompanying illustrations as you proceed with the installation of y ...
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Chamberlain CG40DM - page 5
5 Planning (Continued) ONE-PIECE DOOR INSTALLATIONS • Generally, a one-piece door does not require reinforcement. If your door is lightweight, refer to the information relating to sectional doors in Installation Step 11. • Depending on your door’s construction, you may need additional mounting hardware for the door bracket (Step 11). ONE-PIEC ...
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Chamberlain CG40DM - page 6
6 Your garage door opener is packaged in one carton which contains 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 assembly and installation is shown on the next page. Save the carton and packing ...
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Chamberlain CG40DM - page 7
7 Hardware Inventory Separate all hardware and group as shown below for the assembly and installation procedures. INST ALLA TION HARDW ARE ASSEMBLY HARDWARE INSTALLATION HARDWARE Bolt 1/4"-20x1-3/4" (2) Lock Washer 3/8" (1) Nut 3/8" (1) Lock Nut 1/4"-20 (2) Master Link (2) Carriage Bolt 1/4"-20x1/2" (2) Wing Nut 1 ...
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Chamberlain CG40DM - page 8
8 ASSEMBLY STEP 1 Assemble the Rail & Install the Trolley To avoid installation diffi culties, do not run the garage door opener until instructed to do so. To prevent INJURY from pinching, keep hands and fi ngers away from the joints while assembling the rail. The front rail has a cut out “window” at the door end (see illustration) . The ...
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Chamberlain CG40DM - page 9
9 To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener. ASSEMBLY STEP 2 Fasten the Rail to the Motor Unit • Insert a 1/4"-20x1-3/4" bolt into the cover protection bolt hole on the back end of the rail as shown. Tighten securely with a 1/4"-20 lock nut. DO NOT overtighten . ? ...
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Chamberlain CG40DM - page 10
10 Trolley Threaded Shaft Round Hole Figure 4 Trolley Threaded Shaft Lock 5/16" Washer Inner Nut 5/16" To avoid possible SERIOUS INJURY to fi ngers from moving garage door opener: • ALWAYS keep hand clear of sprocket while operating opener. • Securely attach chain spreader BEFORE operating. Figure 2 Figure 3 ASSEMBLY STEP 4 Install t ...
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Chamberlain CG40DM - page 11
11 INSTALLATION ASSEMBLY STEP 5 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 (Figure 1). • When the chain is approximately 1/4" (6 mm) above the base of the rail at its midpoint, re-tighten the inner nut to secu ...
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Chamberlain CG40DM - page 12
12 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 f ...
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Chamberlain CG40DM - page 13
13 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 B ...
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Chamberlain CG40DM - page 14
14 INSTALLATION STEP 3 Attach the Rail to the Header Bracket • Position the opener on the garage fl oor 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 CG40DM - page 15
15 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 fi nished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural supports before installing the opener. This bracket and fastening hardware are ...
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Chamberlain CG40DM - page 16
16 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 reach of children at a minimum heigh ...
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Chamberlain CG40DM - page 17
17 INSTALLATION STEP 7 Install the Light and Lens INSTALL THE LIGHT • Install an A19 standard neck, 75 watt maximum light bulb in the socket. The light will turn ON and remain lit for approximately 4-1/2 minutes when power is connected. Then the light will turn OFF. • Use standard neck Garage Door Opener bulbs for replacement NOTE: Use only sta ...
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Chamberlain CG40DM - page 18
18 INSTALLATION STEP 9 Electrical Requirements To avoid installation diffi culties, 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 fi t into a grounding type outlet. If the plug doesn't fi t into the outlet you have, ...
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Chamberlain CG40DM - page 19
19 INSTALLATION 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. IMPORTANT INFORMATION ABOUT THE SAFETY REVERSING SENSOR When properly connected and aligned, the sensor will detect an obstacle in the path of its electronic beam. ...
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Chamberlain CG40DM - page 20
20 INSTALLING THE BRACKETS Be sure power to the opener is disconnected. Install and align the brackets so the sensors will face each other across the garage door, with the beam no higher than 6" (15 cm) above the fl oor. They may be installed in one of three ways, as follows. Garage door track installation (preferred): • Slip the curved arm ...
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Chamberlain CG40DM - page 21
21 MOUNTING AND WIRING THE SAFETY REVERSING SENSORS Mounting: • Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. Use wing nuts to fasten sensors to brackets, with lenses pointing toward each other across the door. Be sure the lens is not obstructed by a bracket extension (Figure 5). • Finger tighten the wing nuts. ...
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Chamberlain CG40DM - page 22
22 1 2 3 Figure 10 — Finished Ceiling — Bell Wire Bell Wire Connect Wire to Screw Terminals Safety Reversing Sensor Safety Reversing Sensor Invisible Light Beam Protection Area 1. Strip wire 7/16" (11 mm) 7/16" (11 mm) 2. Twist like colored wires together Connect to garage door opener • Strip 1/4" (6 mm) of insulation from each ...
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Chamberlain CG40DM - page 23
23 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 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 of ...
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Chamberlain CG40DM - page 24
24 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 ...
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Chamberlain CG40DM - page 25
25 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 pulley ...
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Chamberlain CG40DM - page 26
26 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. • 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 brac ...
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Chamberlain CG40DM - page 27
27 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 CG40DM - page 28
28 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 CG40DM - page 29
29 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 CG40DM - page 30
30 OPERATION 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 ✚ ® remote controls and one Security ✚ ® Keyless Entry System. If you purcha ...
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Chamberlain CG40DM - page 31
31 To Open the Door Manually DISCONNECT THE TROLLEY: The door should be fully closed if possible. Pull down on the emergency release handle (so that the trolley release arm snaps into a vertical position) and lift the door manually. The lockout feature prevents the trolley from reconnecting automatically, and the door can be raised and lowered manu ...
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Chamberlain CG40DM - page 32
32 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 fi rst year of operation. Pages 27 and 28 refer to the limit and force adjustments. Only a screwdriver is required. Follow the instructions carefully. Repeat the safety revers ...
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Chamberlain CG40DM - page 33
33 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 CG40DM - page 34
34 KG KG 1 3 9 7 5 1 3 9 7 5 1 2 3 1 Your garage door opener is programmed with self-diagnostic capabilities. The “Learn” button/diagnostic LED will fl ash a number of times then pause signifying it has found a potential issue. Consult Diagnostic Chart below. Diagnostic Chart Symptom: One or both of the Indicator lights on the safety reversing ...
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Chamberlain CG40DM - page 35
35 *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 mini-remote can be programmed to operate other Security ✚ ® garage door openers. To Erase All Codes From Motor Unit Memory To deactivate any unwanted remote, fi rst era ...
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Chamberlain CG40DM - page 36
36 1. Press and release the “learn” button on motor unit. The learn indicator light will glow steadily for 30 seconds. 2. Within 30 seconds, enter a four digit personal identifi cation number (PIN) of your choice on the keypad. Then press and hold the enter button. 3. Release the button when the motor unit lights blink. It has learned the code ...
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Chamberlain CG40DM - page 37
37 7 10 12 5 6 4 9 13 8 1 11 3 2 REPAIR PARTS Rail Assembly Parts 2 1 4 3 5 6 KEY PART NO. NO. DESCRIPTION 1 4A1008 Master link kit 2 41C5141-1 Complete trolley assembly 3 41A5665-2 Complete rail 4 144C56 Idler pulley 5 41A5807 Chain and cable 6 12D598-1 “U” bracket NOT SHOWN 183A163 Wear pads Installation Parts KEY PART NO. NO. DESCRIPTION 1 4 ...
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Chamberlain CG40DM - page 38
38 Motor Unit Assembly Parts DN UP 2 1 3 5 4 7 8 9 6 19 11 13 16 15 14 12 10 15 17 18 LIMIT SWITCH ASSEMBLY Brown Wire (Down) Contact Grey Wire Yellow Wire (Up) Contact Center Limit Contact Drive Gear KEY PART NO. NO. DESCRIPTION 1 41A5615 Chain Spreader 2 41C4220A Gear and sprocket assembly. Complete with: Spring washer, thrust washer, retaining r ...
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Chamberlain CG40DM - page 39
39 ACCESSORIES 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 can be limited to a programmable ...
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Chamberlain CG40DM - page 40
CHAMBERLAIN ® GARAGE DOOR OPENER ONE-YEAR LIMITED WARRANTY FOUR-YEAR MOTOR LIMITED WARRANTY The Chamberlain Group, Inc. (“Seller”) warrants to the fi rst retail purchaser of this product, for the residence in which this product is originally installed, that it is free from defect in materials and/or workmanship for a period of one year from t ...
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