User manual LIFT-MASTER 3950

[. . . ] 845 Larch Avenue Elmhurst, Illinois 60126-1196 www. liftmaster. com ® DOOR OPERATOR Model 3950 For Light Duty Commercial Use 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. [. . . ] If the sending eye indicator light glows steadily but the receiving eye indicator light doesn't: · Check alignment. NOTE: When the invisible beam path is obstructed or misaligned while the door is closing, the door will reverse. If the door is already open, it will not close. Bell Wire Motor unit Figure 5 Bell Wire Sensor Connections WHT/BLK WHT Quick-Connect Terminals To insert or release wires, push in tab with screwdriver tip. Safety Reversing Sensor Invisible Light Beam Protection Area Safety Reversing Sensor 12 ADJUSTMENT STEP 1 Program the Travel Limits Travel limits regulate the points at which the door will stop when moving up or down. Adjust the position of the door by using the black and purple buttons. Black moves the door UP (open) and purple moves the door DOWN (close). NOTE: The safety reversing sensors MUST be installed to program the limits. Figure 1 LED Black Button 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. · 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. To prevent damage to vehicles, be sure fully open door provides adequate clearance. Purple Button Figure 1 Figure 2 SETTING THE UP POSITION: 1. Press and hold the black button until the LED starts flashing slowly, then release. Push and hold the black button until the door reaches the desired UP (open) position. Immediately when the door begins to close, press and release either the black or purple button. Push and hold the purple button until the door reaches the desired DOWN (closed) position. Once the door is closed, if there appears to be too much pressure on the door, you may toggle the door back and forth using the black and purple buttons to reach the desired closed position. Proceed to Set the Force. BLACK BLACK PURPLE PURPLE Figure 3 Figure 4 BLACK PURPLE Figure 5 Figure 6 BLACK BLACK PURPLE PURPLE Figure 7 13 ADJUSTMENT STEP 2 Setting the Force The force setting measures the amount of force required to open and close the door. Push the remote control or door control a third time to close the door (DOWN). The door must travel through a complete cycle, up and down, in order for the force to be set properly. If the garage door opener cannot open and close the door fully, inspect the door to ensure that it is balanced properly and is not sticking or binding. If the door is not stopping exactly where you would like it, repeat 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. [. . . ] If this occurs, the door can be closed by pressing and holding the push button on the single button control station until the door has closed. Releasing the push button prior to the door closing will cause the door to reverse. To Erase All Codes From Motor Unit Memory To deactivate any unwanted remote, first erase all codes: Press and hold the "learn" button on motor unit until the learn indicator light goes out (approximately 6-9 seconds). Reprogram each remote or keyless entry you wish to use. 19 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. [. . . ]