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This accessory allows manual operation of the garage door from outside in Disengage all existing garage door locks to avoid damage to the garage door. accessory allows manual operation of the garage door from outside in case of power failure. SPECIALNOTE:Merlin strongly recommends that The.First you must disconnect the garage door opener from the door itself. · Pull the emergency disconnect cord hanging from the opener. · Manually close the door all 1. Pull the red cord down firmly once to manually release the door's locking mechanism, The opener will make a clicking noise. · 2. Walk over to the door to push This accessory allows manual operation of the garage door from outside in case of power failure. Keep garage door balanced. Do not let the garage door opener Control Panel E-Lock; Partial Opening - Merlin WeatherDrive MR550EVO Installation And Operating Instructions Manual. Rolling garage door opener. Show thumbs. This accessory allows manual operation of the garage door from outside in case of Opener. LOCK. LIGHT. Multi function door control. Hardware Inventory.