The Schneider Electric MTN645094 is a SpaceLogic KNX fan coil actuator REG-K in light grey for DIN-rail mounting. It integrates a bus coupler and provides HVAC control for one fan-coil unit with up to three fan speeds, heating and cooling valves, and an auxiliary relay for electric heater or cooler bank.

The actuator supports 2-pipe and 4-pipe systems with internal PI control (PWM or continuous valve drive) or can operate as a remote actuator receiving setpoints from a MTN6212 room controller or MTN6215-0410S touch panel. Two floating binary inputs suit window contacts and condensate monitoring (additional points are available with MTN644592). Commissioning uses ETS application Fan Coil Actuator 4253/1.0.

Key Features — Fan Coil HVAC Actuator

Outputs and Control

• Fan outputs: Three potential-free contacts — up to 8 A per fan stage (1- to 3-speed fans).
• Valve outputs: Two semiconductor switches for heating/cooling valves — 0.5 A, AC 24–230 V.
• Auxiliary relay: 16 A for electrical heating or cooler bank.
• System types: 2-pipe (common valve) or 4-pipe (separate heating/cooling valves).
• Controller modes: Internal room PI controller or external actuating value from MTN6212 / MTN6215-0410S room interfaces.

Inputs, Operation, and Bus

• Binary inputs: Two floating inputs (e.g. window contact, drip-tray / condensate); max cable length 5 m.
• Front panel: Keys for fan stages and heating/cooling mode; 9 status LEDs.
• KNX bus: Integrated coupler; 12 mA bus current — size the line with MTN684064, MTN6513-1202, or MTN6513-1203.
• Mains: AC 230 V ±10 %, 50/60 Hz — max 3 VA consumption.

At a Glance

Specification	Detail
Order code	MTN645094
ETS application	Fan Coil Actuator 4253/1.0
Outputs (total)	5 (3 fan + 2 valve + auxiliary relay)
Device width	4 modules (approx. 72 mm)
Mounting	35 mm DIN rail (TH35 / EN 60715)
Colour	Light grey

Full electrical and mechanical data are under Technical Specifications. Official Schneider documents are under Downloads (datasheet, user guide, CAD, environmental disclosure).

Applications and KNX Integration

• Hotel and office zones: Per-room fan-coil control with window-contact energy saving; segment floors with MTN6500-0101 line couplers or MTN6500-0103 IP routing.
• Residential VRF/fan-coil: Coordinate fan stages and valves with MTN6212 or MTN6215-0410S room interfaces.
• Condensate safety: Stop HVAC on drip-tray alarm via the on-board binary input or MTN644592 expansion.
• Line monitoring: Track HVAC circuit consumption with MTN6600-0603 energy meters.
• Mixed loads on the same line: Pair with MTN6700-0104 / MTN6700-0108 hybrid actuators for lighting and blinds, or MTN6700-0304 for high-current valve circuits.

Choosing Schneider SpaceLogic Actuators and HVAC

Choose MTN645094 when you need a single fan-coil actuator with integrated bus coupling, three fan speeds, and valve plus auxiliary relay outputs. For general switching and dimming on the same installation, add MTN6700-0116 or MTN6710-0102S; for secure switch extensions use MTN6705-0008S with MTN6805-0008 blind extensions where needed.