LiftMaster 3950 3950 Manual - Page 6

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. Disable ALL locks and remove ALL ropes connected to door BEFORE installing operator to avoid entanglement. 5 Mount emergency release handle no higher than 6 feet (1.83 m) above floor. 6. NEVER connect door operator to power source until instructed to do so. 7. NEVER wear watches, rings or loose clothing while installing or servicing operator. They could be caught in door or operator mechanisms. 8. Install wall-mounted door control: • within sight of the door. • out of reach of children at minimum height of 5 feet (1.5 m). • away from ALL moving parts of the door. 9. Install the Entrapment Warning Placard next to the control station in a prominent location. 10. Place manual release/safety reverse test label in plain view on inside of door. 11. Upon completion of installation, test safety reversal system. 12. Install the operator at least 8 feet (2.5 m) or more above the floor if the operator has exposed moving parts. INSTALLATION STEP 1 Install the Door Sprocket The instructions below are general and we recommend you refer to the door manufacturer for specific instructions for your door. Live shaft type (Figure 1): 1. Slide the door sprocket onto the end of the door shaft. 2. Mark and drill a hole through the door shaft. 3. Attach the door sprocket to the door shaft with the through bolt and nylock nut. NOTE: Drive shaft must extend 1-1/2" beyond the door support bracket. Figure 1 Door Door Shaft Through Bolt Door Sprocket Nylock Nut Drum Door Bracket Door Sprocket Dead shaft type (Figure 2): 1. Slide the door sprocket onto the end of the door shaft. 2. Slide the through bolts with flat washers into the door sprocket with tubular spacers and attach to the door drum. 3. Secure the sprocket to the drum as shown. Figure 2 Drum Door Sprocket Flange Nut Door Drum Tubular Spacer Door Sprocket Flat Washer 6