The Multi-Volt Zone Sentry Zone Valve accepts input voltages between 120 and 277VAC 50/60HZ. It is designed for use in hydronic HVAC systems, primarily in fan coils and air handlers or other HVAC systems where a quality line voltage zone valve is required. The Multi-Volt Zone Sentry Zone Valve can be installed in both heating and cooling applications and is available in a normally closed or normally open configuration. The Taco Zone Sentry® Zone Valve enhances the overall performance of any zone valve system. The unique patented technology in the Zone Sentry utilizes a microcircuit based logic to control a gear driven electronic actuator which drives a ball valve based body design. All this adds up to a zone valve that leads the industry in energy efficiency, flow capacity (Cv), shutoff pressure rating, ease of installation, diagnostic capability and the number of valves (12) that can be use on a standard 40VA transformer