Eurapo UCS 621, a cassette fan coil from the EST inverter range: 4-way air discharge, flush false-ceiling installation. As ordered it carries an EC brushless motor with built-in inverter; an ON/OFF 3-way regulating valve with bypass (_3xx / J3xx, 230 V thermoelectric actuator); DT full-bore ball shut-off valves with T handle, so the unit can be isolated from the pipework for service; the AS air sensor (NTC 10 kΩ at 25 °C) on the air intake; an OPower BMS card (Modbus RTU over RS-485) for integration into a building management system; water connections on the right-hand side (DX, the factory standard; SX is the left-hand alternative). Rated performance for this configuration: cooling capacity 2.85 kW, sensible cooling capacity 2.54 kW, heating capacity 2.99 kW, sound power level 22–45 dB(A), water connections 3/4". No remote control is included with this configuration; Eurapo’s Omnibus 360 consoles are ordered separately. Maximum operating pressure is 10 bar with valves fitted. Full type designation ESTUCS 621+AS+ORBU.10+DT_3B2+DX. Supplied under manufacturer part number ESTUCS621+OPT V2 3W, HS code 8415.90, country of origin Italy.