User manual CHAMBERLAIN 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. [. . . ] 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. NOTE: Make sure the door opens high enough for your vehicle. This sets the UP (open) limit and begins closing the door. 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. This sets the DOWN (close) limit and the door should open. 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 purple button twice to enter into the Force Adjustment Mode. Push the remote control or door control. Push the remote control or door control again. Push the remote control or door control a third time to close the door (DOWN). The LED will stop flashing when the force has been programmed. The door must travel through a complete cycle, up and down, in order for the force to be set properly. [. . . ] After a programmed number of hours or number of accesses, this temporary PIN expires and will no longer open the door. It can be used to close the door even after it has expired. Press the four buttons for your personal entry PIN (not the last temporary PIN), then press and hold the button. The operator light will blink three times. [. . . ]