LiftMaster 3255 3255 Manual - Page 13

INSTALLATION STEP 6 Install the Door Control Locate door control within sight of the door at a minimum height of 5 feet (1.5 m) where small children cannot reach, and away from moving parts of the door and door hardware. The installation surface must be smooth and flat. If installing into drywall (Figure 1), drill 5/32" holes and use anchors provided. For pre-wired installations (as in new home construction), it may be mounted to a single gang box (Figure 2). NOTE: After installation, a green indicator light behind the cover will indicate proper connection. If not lit, the Lock and Light features will not function (reverse wires to correct). 1. Strip 7/16" (11 mm) of insulation from one end of bell wire and connect to the two screw terminals on back of door control by color: white wire to 2 and white/red wire to the 1 (Figure 3). 2. Remove cover by gently prying at slot in top of the cover with a small flat head screwdriver (Figure 4). Fasten with 6ABx1-1/4" self-tapping screws (drywall installation) or 6-32x1" machine screws (into gang box) as follows: • Drill and install bottom screw, allowing 1/8" (3 mm) to protrude above wall surface. • Position bottom of door control on screw head and slide down to secure. Adjust screw for snug fit. • Install top screw with care to avoid cracking plastic housing. Do not overtighten. • Insert bottom tabs and snap on cover. NOTE: The push bar may stick if the door control is not mounted on a smooth surface. If a click is not heard when pressing the push bar, loosen the two mounting screws or relocate the door control to a smoother surface. 3. (Standard installation only) Run bell wire up wall and across ceiling to motor unit. Use insulated staples to secure wire in several places. Do not pierce wire with a staple, creating a short or open circuit. 4. Strip 7/16" (11 mm) of insulation from end of bell wire. Connect bell wire to the quick-connect terminals as follows: white to white and white/red to red (Figure 5). NOTE: When connecting multiple door controls to the opener, twist same color wires together. Insert wires into quick-connect holes: white to white and red/white to red. 5. Use tacks or staples to permanently attach entrapment warning label to wall near door control, and manual release/safety reverse test label in a prominent location on inside of garage door. NOTE: DO NOT connect the power and operate the opener at this time. The trolley will travel to the full open position but will not return to the close position until the sensor beam is connected and properly aligned. See Safety Reversing Sensor Instructions beginning on page 16. To prevent possible SERIOUS INJURY or DEATH from electrocution: • Be sure power is NOT connected BEFORE installing door control. • Connect ONLY to 24 VOLT low voltage wires. To prevent possible SERIOUS INJURY or DEATH from a closing garage door: • Install door control within sight of garage door, out of reach of children at a minimum height of 5 feet (1.5 m), and away from ALL moving parts of door. • NEVER permit children to operate or play with door control push buttons or remote control transmitters. • Activate door ONLY when it can be seen clearly, is properly adjusted, and there are no obstructions to door travel. • ALWAYS keep garage door in sight until completely closed. NEVER permit anyone to cross path of closing garage door. HARDWARE SHOWN ACTUAL SIZE Screw 6ABx1-1/4" (std installation) Insulated Staples Screw 6-32x1" (pre-wired) Figure 1 STANDARD INSTALLATION Drywall Anchors PRE-WIRED Figure 2 INSTALLATION LOCK LIGHT To Replace Insert Bottom Tabs First LOCK LIGHT To Replace Insert Bottom Tabs First 24 Volt Bell Wire Figure 3 MULTI-FUNCTION Figure 4 REMOVE COVER DOOR CONTROL (BACK) Top Mounting Hole Slot Terminal Screws Bell Wire Bottom Mounting Hole LOCK LIGHT Figure 5 Door Control Connections To release or insert wire, push in tab with screwdriver tip 9 1 7 3 5 KG 9 1 7 3 5 KG Red White Grey 7/16" (11 mm) Strip wire 7/16" (11 mm) 13