The Siemens Building Technology RDB160BNU Room Thermostat is a programmable HVAC controller designed to regulate temperature in compatible fan coil units. Operating on 24 VAC, it uses a built-in temperature sensor to monitor room conditions and control fan speeds, valve actuators, and compatible electric heaters to maintain the desired temperature. It supports 2-pipe, 2-pipe with elec... https://www.partshnc.com/rdb160bnu-siemens-building-technology-fan-coil-stat-wbacnet-mstp