The Schneider Electric TC903-3A4DLMSA is a four-pipe, three-speed fan coil unit controller with multi-function logic and network connectivity, designed for large-scale commercial HVAC systems demanding independent heating and cooling control.

• Part Number: TC903-3A4DLMSA
• Pipe Configuration: 4-pipe (independent heating + cooling coils)
• Fan Speeds: 3-speed (Low / Medium / High)
• Communication: Network-enabled (Modbus RTU / BACnet MS/TP)
• Control Logic: Multi-function (scheduling, override, PID control)
• Setpoint Range: 5°C to 35°C
• Power Supply: 24 VAC
• Display: LCD

Designed for large commercial buildings, airports, hospitals, and convention centres with four-pipe FCU systems where both heating and cooling are simultaneously available. Network connectivity enables zone-by-zone control and BMS integration. Multi-function logic supports occupancy scheduling, setback modes, and emergency override — reducing energy waste without compromising comfort.