LiftMaster 8500 8500 Manual - Page 10

Installation 4 Attach the Cable Tension Monitor (Required) NOTE: The cable tension monitor is shipped for left side installation. It is recommended that the cable tension monitor be installed on the same side of the door as the garage door opener. For right side installation, remove the snap-ring holding the roller in place and reassemble it on the opposite side of the cable tension monitor. 1. Position the cable tension monitor as close to the drum as possible. Make sure cable tension monitor is located over a wood support member and the roller is free from any obstructions. NOTE: There must be no obstructions in the installation area that prevent the cable tension monitor or the cable itself from closing completely when slack is detected. The cable tension monitor MUST be connected and properly installed before the garage door opener will move in the down direction. The cable tension monitor detects ANY slack that may occur in the cables and will reverse the door, eliminating service calls. HARDWARE 2. Mark and drill 3/16 inch pilot holes for screws (pilot holes are not required for anchors). NOTE: If the cable tension monitor cannot be mounted into wood with the lag screws provided, it can be mounted into 1/2 inch or greater drywall using the wall anchors (2) and the #8 hex screws (2) provided in the hardware bag. 3. Attach the cable tension monitor to the wall using the hardware provided. Make sure that the roller is on top of the cable. ##88HHex HHeeaaddSScrcerwew(2)(2) Screw #6 (2) Insulated Staples (Not shown) 4. Run bell wire to garage door opener. Use insulated staples to secure wire. 5. Connect bell wire to the green quick-connect terminals on the garage door opener (polarity is not important). NOTE: Cable must have tension through entire door travel. Make sure there is no slack in cable on opposite side of garage door during normal operation. If slack occurs during door travel, adjust cables as required. Wall Anchor (2) (to garage door opener) Drum SIDE VIEW To insert or release wire, push in tab with screwdriver tip WHT/GRN Cable Wall 1/8"-1/4" (3-6 cm) Cable Tension Monitor Roller Cable Tension Monitor Drum 2"-6" (5-15 cm) Cable Tension Monitor Roller 3/4" Min.(18 cm Min.) (to cable tension monitor) 10