LiftMaster 8557 8557 Manual - Page 21

Power 1 Connect Power To avoid installation difficulties, do not activate the garage door opener at this time. To reduce the risk of electric shock, your garage door opener has a grounding type plug with a third grounding pin. This plug will only fit into a grounding type outlet. If the plug doesn't fit into your outlet, contact a qualified electrician to install the proper outlet. To prevent possible SERIOUS INJURY or DEATH from electrocution or fire: • Be sure power is NOT connected to the opener, and disconnect power to circuit BEFORE removing cover to establish permanent wiring connection. • Garage door installation and wiring MUST be in compliance with ALL local electrical and building codes. • NEVER use an extension cord, 2-wire adapter, or change plug in any way to make it fit outlet. Be sure the opener is grounded. THERE ARE TWO OPTIONS FOR CONNECTING POWER: OPTION A TYPICAL WIRING 1.1A Plug in the garage door opener into a grounded outlet. 1.2A DO NOT run garage door opener at this time. OPTION B PERMANENT WIRING If permanent wiring is required by your local code, refer to the following procedure. To make a permanent connection through the 7/8 inch hole in the top of the motor unit (according to local code): Wiring through a filter board (8550 models manufactured before April 12, 2013): 1.1B Be sure power is NOT connected to the opener, and disconnect power to circuit. 1.2B Remove the garage door opener cover and set aside. 1.3B Remove the attached green ground terminal. 1.4B Cut black and white wires. Strip away 1/2 inch (1 cm) of insulation, 3 inches (7.5 cm) before spade terminals. 1.5B Remove the power cord from opener. 1.6B Install a conduit or flex cable adapter to the 7/8 inch hole. 1.7B Run wires through conduit, cut to proper length and strip insulation. 1.8B Attach with wire nuts provided. Attach the ground wire to the green ground screw. The opener must be grounded. 1.9B Properly secure wire under plastic ties so that wire does not come in contact with moving parts. 1.10B Reinstall the cover. DO NOT run garage door opener at this time. Wiring through a terminal block (8550 models manufactured after April 12, 2013 and all 8557 models): 1.1B Remove the motor unit cover screws and set the cover aside. 1.2B Remove the attached 3-prong cord. 1.3B Connect the black (line) wire to the screw on the brass terminal; the white (neutral) wire to the screw on the silver terminal; and the ground wire to the green ground screw. The opener must be grounded. 1.4B Reinstall the cover. TYPICAL WIRING PERMANENT WIRING (Filter Board) Black Wire Ground Wire Ground Tab Green Ground Screw White Wire Wire Nuts PERMANENT WIRING (Terminal Block) Ground Tab Green Ground Screw Ground Wire White Wire Black Wire Black Wire 21