Brand New Smart Fan Coil Thermostat

Smart Scheduling & Precise Climate Control, Redefines FCU Efficiency

WT303/WT304

Compatible with 2-Pipe/4-Pipe FCU
Supports 8 Custom Schedules
2.7-Inch E-Ink Screen
Ergonomically Designed Buttons

Window Opening Detection/Tamper Protection/Freeze Protection
3 Temperature Control Modes, 4 Fan Modes
Easy-to-Install Design
Support DI Interface-Key Card Integration

FEATURES
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Efficiency Driven. Comfort Assured - WT30x Delivers It All

The Milesight LoRaWAN® smart fan coil thermostat is compatible with both 4-pipe and 2-pipe fan coil systems, supporting 3-speed fans and EC fan control. It seamlessly integrates into intelligent control systems to enable centralized management and efficient energy consumption optimization, aiming to revolutionize HVAC management in modern buildings, hotels, shopping malls, etc..

Typical Application

Creates an Energy-Efficient "Breathing" Building

Multi-system seamless compatibility: Fully integrated with various FCU, with zero-obstacle retrofitting of new/old systems;
Intelligent floor zoning scheduling: Occupied/Unoccupied modes by workweek/weekend, achieving 25%+ energy savings;
Real-time anomaly alerts: Sustained high/low temps will trigger LoRaWAN® alarms, protect indoor asset safety.

Hotel Room Control Experience Upgrade

Room Card Linkage with Auto-Adaptation: Instant switching to Comfort Mode upon card insertion; triggering ECO Mode when card is removed to enhance check-in convenience.
Window Open Detection: Auto-pauses temperature control when a window is opened, minimizing energy waste and help hotels in meeting ESG energy-saving goals.

Help Shopping Malls Achieve Low-Cost Operations

Intelligent Peak Traffic Response: Integrating with VS133 the customer flow counting sensor to adjust fan speed in real time, enabling rapid cooling to prevent stuffiness and enhance the shopping experience;
Delayed Fan Shutdown: Fans run for 10 minutes post-closure to discharge residual energy, cutting energy waste and equipment maintenance costs;
Multi-zone Independent Control: 4-pipe system allows precise switching of chilled/hot water valves, ensuring zero temperature conflicts across complex business areas.

One-Click Access to
“WT30x Commercial
Scenario Reports”

Experience the next-generation FCU climate control solution immediately

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WT303

WT303 supports switch-type electric
valve for general application

WT304

WT304 supports 0-10V proportional
valves and 3-speed EC/AC fans for
wider applications

Total Compatibility for 2-Pipe/4-Pipe FCU

Unmatched Flexibility. Total Control

The thermostat provides 8 custom schedules, each allowing up to 16 execution times. It tailors to all your control needs!

Smart Control Driven
by Any Data

WT303/WT304 redefines climate control, seamlessly integrating built-in sensors, external NTC probes, LoRaWAN® remote commands, and Milesight D2D device collaboration to enable Local-to-Cloud Smart Response - One Device Fits All.

Built-in Sensors

External NTC Sensor

LoRaWAN®

Milesight D2D

Minimalist Design:
Eco-Friendly Without Compromising Aesthetics

2.7-Inch E-Ink Screen

Low power consumption, Clear Viewing, and
Eye-Friendly!

Ergonomically Designed Buttons

Master in Seconds!

No More Wasted Energy or Safety Risks
WT30x Has You Covered

Window Open Detection

Window open, auto-stop climate
control to save energy

Tamper Protection

Prevent abnormal temperature
caused by an accidental touch

Anti-Freeze Protection

Automatic heating in low temperatures to
protect indoor assets' safety

Anti-Theft Protection

Anti-theft structure design,
assets safe

Fan Delay Mode

After device shutdown, fan runs on to expel
residual heat

Remote Configuration + FUOTA

Remote configuration via Milesight Development
Platform for Effortless Building Automation

Real-Time Anomaly Alerts

Temperature anomaly triggers alarm to
ensure safety

LoRaWAN® Wireless Deployment

WT30x LoRaWAN® Wireless Thermostat – Long-range connectivity, low power, robust encryption. Delivers intelligent HVAC control!Versatile and reliable in complex scenarios – the top choice for large-scale projects.

Milesight D2D

The WT30x Smart Fan Coil Thermostat, powered by Milesight D2D protocol, enables seamless smart interoperability with other Milesight sensors in no time—no gateway required.

Easy Installation

Connecting The Wires

Wall Mounting

Fixed

Notice: Unused cables must be insulated and secured

Not Sure If It's Compatible with Yours?

Getting the right product to work perfectly with your wiring can make everything go much smoother. Let us help you find the best thermostat with these step-by-step instructions.

Compatibility Checker

Specifications

WT303
WT304

Thermostat Feature
Compatible Fan Coil	2-pipe and 4-pipe Fan Coil Units (FCUs) with 1-3-speed fans or ECM (0-10V) fans For more see Compatibility Checker.
Compatible Valve	2-wire or 3-wire On/Off Motorized Valves
Relay Amps	Resistance: 5A, Inductive: 3A
Temperature Control Range	5°C ~ 35°C
Temperature Control Mode	Heat, Cool, Ventilation
Fan Mode	Low, Medium, High, Auto
Others
Inputs	1 × 10k ± 1% 3950 NTC Input, 1 × DI (Dry Contact) for keycard switches, magnet switches, etc. (only for physical switches or buttons)
Advanced Feature	Local Control Schedule, Freeze Protection, Open Window Detection, Fan Delay, Temp. Control and Dehumidify
Sensor
Temperature
Operating Principle	Digital CMOSens® technology (MEMS)
Range	-20°C ~ 60°C
Accuracy	± 0.5°C (0°C ~ 60°C), ± 1°C (-20°C ~ 0°C)
Resolution	0.1°C
Humidity
Operating Principle	Digital CMOSens® technology (MEMS)
Range	0% - 100% RH
Accuracy	Typical ± 2% RH, Max. ± 5% RH
Resolution	0.1% RH
Wireless Transmission
Protocol	LoRaWAN®, Milesight D2D
Antenna	Internal Antennas
Frequency	CN470/EU868/RU864/1N865/AU915/US915/KR920/A5923-1&2&3&4
Tx Power	16dBm (868 MHz) / 19dBm (470 MHz) / 22dBm (915 MHz)
Sensitivity	-137dBm
Mode	OTAA/ABP Class C
Others
Display	2.7-inch Black&White E-ink Screen
Button	5 External Buttons for FCU System On/Off, Temperature Up/Down, Temperature Control Mode Switch, Fan Mode Switch, Reboot and Reset
LED Indicator	1 x Reset/Reboot Indicator
USB	1 x Type-C Port for Console
Software
Configuration	NFC via mobile App or Downlink
Advanced Feature	Threshold Alarm, Child Lock, Multicast, Milesight D2D Controller, Milesight D2D Agent, External Sensor Mode, Milesight D2D Sensor Data Receiving, FUOTA
Physical Characteristics
Power Supply	100 ~ 240 VAC, 50 ~ 60Hz
Operating Temperature	-20°C ~ 60°C (E-ink Screen: 0°C ~ 40°C)
Relative Humidity	0 ~ 95% (Non-condensing)
Ingress Protection	IP20
Color & Material	White, PC + ABS (UL94 V0)
Dimension	46 × 46 × 30 mm
Wire Connection	AWG 14-26
Installation	86mm Square or European 60mm Round Box Mounting 118 or 120 Wall Box Mounting via (optional) Wall Plate Accessories

Thermostat Feature
Compatible Fan Coil	2-pipe and 4-pipe Fan Coil Units (FCUs) with 1-3-speed fans or ECM (0-10V) fans For more see Compatibility Checker.
Compatible Valve	0-10V Proportional Integral Valves, 2-wire or 3-wire On/Off Motorized Valves
Relay Amps	Resistance: 5A, Inductive: 3A
Temperature Control Range	5°C ~ 35°C
Temperature Control Mode	Heat, Cool, Ventilation
Fan Mode	Low, Medium, High, Auto
Others
Inputs	1 × 10k ± 1% 3950 NTC Input, 1 × DI (Dry Contact) for keycard switches, magnet switches, etc. (only for physical switches or buttons)
Advanced Feature	Local Control Schedule, Freeze Protection, Open Window Detection, Fan Delay, Temp. Control and Dehumidify
Sensor
Temperature
Operating Principle	Digital CMOSens® technology (MEMS)
Range	-20°C ~ 60°C
Accuracy	± 0.5°C (0°C ~ 60°C), ± 1°C (-20°C ~ 0°C)
Resolution	0.1°C
Humidity
Operating Principle	Digital CMOSens® technology (MEMS)
Range	0% - 100% RH
Accuracy	Typical ± 2% RH, Max. ± 5% RH
Resolution	0.1% RH
Wireless Transmission
Protocol	LoRaWAN®, Milesight D2D
Antenna	Internal Antennas
Frequency	CN470/EU868/RU864/1N865/AU915/US915/KR920/A5923-1&2&3&4
Tx Power	16dBm (868 MHz) / 19dBm (470 MHz) / 22dBm (915 MHz)
Sensitivity	-137dBm
Mode	OTAA/ABP Class C
Others
Display	2.7-inch Black&White E-ink Screen
Button	5 External Buttons for FCU System On/Off, Temperature Up/Down, Temperature Control Mode Switch, Fan Mode Switch, Reboot and Reset
LED Indicator	1 x Reset/Reboot Indicator
USB	1 x Type-C Port for Console
Software
Configuration	NFC via mobile App or Downlink
Advanced Feature	Threshold Alarm, Child Lock, Multicast, Milesight D2D Controller, Milesight D2D Agent, External Sensor Mode, Milesight D2D Sensor Data Receiving, FUOTA
Physical Characteristics
Power Supply	100 ~ 240 VAC, 50 ~ 60Hz
Operating Temperature	-20°C ~ 60°C (E-ink Screen: 0°C ~ 40°C)
Relative Humidity	0 ~ 95% (Non-condensing)
Ingress Protection	IP20
Color & Material	White, PC + ABS (UL94 V0)
Dimension	46 × 46 × 30 mm
Wire Connection	AWG 14-26
Installation	86mm Square or European 60mm Round Box Mounting 118 or 120 Wall Box Mounting via (optional) Wall Plate Accessories

Documents

WT30x Fan Coil Thermostat Datasheet Payload Decoder Firmware & SDK Download

Brand New Smart Fan Coil Thermostat

Efficiency Driven. Comfort Assured - WT30x Delivers It All

Typical Application

Creates an Energy-Efficient "Breathing" Building

Hotel Room Control Experience Upgrade

Help Shopping Malls Achieve Low-Cost Operations

One-Click Access to“WT30x CommercialScenario Reports”

WT303

WT304

Total Compatibility for 2-Pipe/4-Pipe FCU

Unmatched Flexibility. Total Control

Smart Control Drivenby Any Data

Built-in Sensors

External NTC Sensor

LoRaWAN®

Milesight D2D

Minimalist Design:Eco-Friendly Without Compromising Aesthetics

2.7-Inch E-Ink Screen

Ergonomically Designed Buttons

No More Wasted Energy or Safety RisksWT30x Has You Covered

Window Open Detection

Tamper Protection

Anti-Freeze Protection

Anti-Theft Protection

Fan Delay Mode

Remote Configuration + FUOTA

Real-Time Anomaly Alerts

LoRaWAN® Wireless Deployment

LoRaWAN® Wireless Deployment

Milesight D2D

Easy Installation

Not Sure If It's Compatible with Yours?

Related Products

Specifications

Documents

One-Click Access to
“WT30x Commercial
Scenario Reports”

Smart Control Driven
by Any Data

Minimalist Design:
Eco-Friendly Without Compromising Aesthetics

No More Wasted Energy or Safety Risks
WT30x Has You Covered