The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.liftmaster.com ® DOOR OPERATOR Model 3950 Co m For Light Duty Commercial Use pa tib le with Owner’s Manual ■ Please read this manual and the enclosed safety materials carefully! ■ The door WILL NOT CLOSE unless The Protector System® is connected and properly aligned. ■ Periodic checks of the operator are required to ensure safe operation. ■ The model number label is located behind the hinged door of your operator.
TABLE OF CONTENTS Introduction 2-4 Operation 16-18 Safety symbol review and signal word review . . . . . . . . . . . . . . . Preparing your door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carton inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hardware inventory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing Your Door Before you begin: • Remove any ropes connected to door. • Raise and lower the door to ensure the door does not bind or stick and is properly balanced. If your door binds, sticks or is out of balance refer to the door manufacturer for more information. For live shaft type doors the drive shaft needs to extend 1-1/2" beyond the door mount bracket. • If the operator is mounted below 8 feet (2.5 m), a chain guard must be installed to protect against possible injury. See accessories page.
Carton Inventory Note that accessories will depend on the model purchased. If anything is missing, carefully check the packing material. Your door operator is packaged in one carton which contains the motor unit and the parts illustrated below.
ASSEMBLY STEP 1 Figure 1 Attach the Drive Sprocket Output Shaft Drive Sprocket The drive sprocket can be installed on the right or left side of the operator depending on your installation. The drive sprocket has three holes to aid in the alignment of the drive sprocket with the door sprocket. 1. Insert the drive sprocket into the output shaft. 2. Align the center holes in the drive sprocket with the hole in the output shaft. 3. Insert bolts into the output shaft and the drive sprocket. 4.
WARNING INSTALLATION IMPORTANT INSTALLATION INSTRUCTIONS WARNING To reduce the risk of SEVERE INJURY or DEATH: 1. READ AND FOLLOW ALL INSTALLATION WARNINGS AND INSTRUCTIONS. 2. Install door operator ONLY on properly balanced and lubricated door. An improperly balanced door may not reverse when required and could result in SEVERE INJURY or DEATH. 3. ALL repairs to cables, spring assemblies and other hardware MUST be made by a trained door systems technician BEFORE installing operator. 4.
INSTALLATION STEP 2 Mount the Operator To prevent possible SERIOUS INJURY or DEATH: • Concrete anchors MUST be used if mounting bracket into masonry. • NEVER try to loosen, move or adjust door, springs, cables, pulleys, brackets or their hardware, ALL of which are under EXTREME tension. • ALWAYS call a trained door systems technician if door binds, sticks or is out of balance. An unbalanced door might not reverse when required. • Operator MUST be mounted at a right angle to the door shaft.
INSTALLATION STEP 3 Attach the Emergency Release Rope and Handle To prevent possible SERIOUS INJURY or DEATH from a falling door: • If possible, use emergency release handle to disengage door ONLY when door is CLOSED. Weak or broken springs or unbalanced door could result in an open door falling rapidly and/or unexpectedly. • NEVER use emergency release handle unless doorway is clear of persons and obstructions. 1.
INSTALLATION STEP 5 Electrical Requirements To prevent possible SERIOUS INJURY or DEATH from electrocution or fire: • Be sure power is not connected to the operator, and disconnect power to circuit BEFORE removing cover to establish permanent wiring connection. • Door installation and wiring MUST be in compliance with ALL local electrical and building codes. • NEVER use an extension cord, 2-wire adapter or change plug in ANY way to make it fit outlet. Be sure the operator is grounded.
INSTALLATION STEP 6 Install The Protector System® Be sure power is not connected to the door operator BEFORE installing the safety reversing sensor. To prevent SERIOUS INJURY or DEATH from a closing door: • Correctly connect and align the safety reversing sensor. This required safety device MUST NOT be disabled. • Install the safety reversing sensor so beam is NO HIGHER than 6" (15 cm) above floor.
INSTALLING THE BRACKETS Be sure power to the operator is disconnected. Install and align the brackets so the safety reversing sensors will face each other across the door, with the beam no higher than 6" (15 cm) above the floor. They may be installed in one of three ways, as follows. Wall installation (Figures 1 and 2): • Place the bracket against the wall with curved arms facing the door. Be sure there is enough clearance for the sensor beam to be unobstructed.
MOUNTING AND WIRING THE SAFETY REVERSING SENSORS • Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. Use wing nuts to fasten safety reversing sensors to brackets, with lenses pointing toward each other across the door. Be sure the lens is not obstructed by a bracket extension (Figure 4). • Finger tighten the wing nuts. • Run the wires from both safety reversing sensors to the operator. Use insulated staples to secure wire to wall and ceiling.
ADJUSTMENT STEP 1 Program the Travel Limits Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing door. • NEVER learn forces or limits when door is binding or sticking. Repair door first. • Incorrect adjustment of door travel limits will interfere with proper operation of safety reversal system. • After ANY adjustments are made, the safety reversal system MUST be tested.
ADJUSTMENT STEP 2 Set the Force Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing door. • NEVER learn forces or limits when door is binding or sticking. Repair door first. • Too much force on door will interfere with proper operation of safety reversal system. • After ANY adjustments are made, the safety reversal system MUST be tested.
ADJUSTMENT STEP 3 Test The Protector System® Without a properly installed safety reversing sensor, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing door. • Press the single button control station to open the door. • Place the operator carton in the path of the door. • Press the single button control station to close the door. The door will not move more than an inch, and the operator lights will flash.
WARNING OPERATION IMPORTANT SAFETY INSTRUCTIONS WARNING To reduce the risk of SEVERE INJURY or DEATH: 1. READ AND FOLLOW ALL WARNINGS AND INSTRUCTIONS. 2. ALWAYS keep remote controls out of reach of children. NEVER permit children to operate or play with door control push buttons or remote controls. 3. ONLY activate door when it can be seen clearly, it is properly adjusted and there are no obstructions to door travel. 4. ALWAYS keep door in sight until completely closed.
HAVING A PROBLEM? (TROUBLESHOOTING) 1. The operator doesn’t operate from either the door control or the remote control: • Does the operator have electric power? Plug a lamp into the outlet. If it doesn’t light, check the fuse box or the circuit breaker. (Some outlets are controlled by a wall switch.) • Is there a build-up of ice or snow under the door? The door may be frozen to the ground. Remove any restriction. • The door spring may be broken. Have it replaced (see page 3 for reference). 2.
Motor unit Installed Safety Reversing Sensor “Learn” Button LED or Diagnostic LED “Learn” Button Your door operator 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. Consult Diagnostic Chart below. Diagnostic Chart 1 FLASH Safety reversing sensors wire open (broken or disconnected). OR 2 FLASHES Safety reversing sensors wire shorted or black/white wire reversed.
PROGRAMMING NOTICE: If this Security✚® door operator is operated with a non-rolling code transmitter, the technical measure in the receiver of the door operator, which provides security against code-theft devices, will be circumvented. The owner of the copyright in the door operator does not authorize the purchaser or supplier of the non-rolling code transmitter to circumvent that technical measure.
To Add, Program or Change a Keyless Entry PIN (Not Provided) NOTE: The optional Keyless Entry must be programmed to operate your door operator. USING THE “LEARN” BUTTON Optional To change an existing, known PIN If the existing PIN is known, it may be changed by one person without using a ladder. 1. Press the four buttons for the present PIN, then press and hold the # button. The operator light will blink twice. Release the # button. 2. Press the new 4-digit PIN you have chosen, then press Enter.
REPAIR PARTS Installation Parts 6 4 3 10 1 2 9 5 NOT ICE KEY NO. 1 2 PART NO. APBS 1 41A6298-5 3 4 5 41B4494-1 41C0902 41A5034 7 KEY NO. 6 7 8 9 10 DESCRIPTION Single button control station Emergency release rope, handle assembly and installation hardware bag (includes hardware listed on page 4) 2-conductor bell wire white & white/red Mounting bracket (1) Safety reversing sensor kit (receiving and sending eyes) with 3 feet (.9 m) 2-conductor bell wire attached PART NO.
ACCESSORIES 41A5281 Extension Brackets: (Optional) For safety reversing sensor installation onto the wall or floor. 377LM Keyless Entry with Security✚® : Enables end user to operate door operator 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 number of hours or entries.
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LIFTMASTER® SERVICE IS ON CALL HOW TO ORDER REPAIR PARTS OUR LARGE SERVICE ORGANIZATION SPANS AMERICA Selling prices will be furnished on request or parts will be shipped at prevailing prices and you will be billed accordingly. INSTALLATION AND SERVICE INFORMATION IS AS NEAR AS YOUR TELEPHONE. WHEN ORDERING REPAIR PARTS, ALWAYS GIVE THE FOLLOWING INFORMATION: SIMPLY DIAL OUR TOLL FREE NUMBER: • PART NAME • MODEL NUMBER 1-800-528-2806 ADDRESS ORDERS TO: THE CHAMBERLAIN GROUP, INC.
