Milesight WT303 & WT304 Smart Fan Coil Thermostat
Featuring LoRaWAN®
Product Overview
The Milesight WT303 & WT304 are advanced room thermostats designed for air conditioner applications with 2-pipe or 4-pipe fan coil units (FCUs), supporting 3-speed fans or ECM fans. They offer manual control via buttons and automatic control through predefined logic, scheduled programming, or remote management systems, ensuring optimal comfort and energy efficiency. The thermostats feature a 2.7-inch e-ink screen and embedded temperature and humidity sensors, providing continuous display of room status and ambient conditions. They are compatible with standard LoRaWAN® gateways and the Milesight Development Platform for real-time remote monitoring.
Features
- Applicable for 2-pipe and 4-pipe FCUs with 3-Speed fans or ECM fans.
- Compatible with 2-wire On/Off relay, 3-wire On/Off relay, or 0-10V valve control.
- Supports an intuitive 2.7-inch display for clear visualization of temperature, humidity, and room status.
- Equipped with an external NTC sensor signal input and a dry contact input for keycard/magnet switches.
- Highly adaptable to different scenarios with support for 60mm/86mm/118mm/120mm boxes.
- Allows manual or automatic adjustment of room temperature.
- Optional data sources for environmental detection and accurate control include built-in sensors, external NTC sensors, Milesight sensors, and external sensor data from network servers.
- Supports adding 8 plans with up to 16 schedules each for diverse control needs and energy savings.
- Features open-window detection and freeze protection.
- Includes a child lock function for safety.
- Functions seamlessly with standard LoRaWAN® gateways and network servers.
- Compatible with BACnet systems via Milesight LoRaWAN® gateways.
- Compatible with the Milesight Development Platform.
- Supports Milesight D2D protocol for ultra-low latency control without a gateway.
- Supports multicast for bulk control.
- Supports Firmware Update Over the Air (FUOTA).
Specifications
| Model | WT303 | WT304 |
|---|---|---|
| Thermostat Feature | ||
| Compatible Fan Coil | 2-pipe and 4-pipe Fan Coil Units (FCUs) with 3-speed fans or EC (0-10V) fans. For more see Compatibility Checker. | |
| Compatible Valve | 2-wire or 3-wire On/Off Motorized Valves | 0-10V Proportional Integral Valves, 2-wire or 3-wire On/Off Motorized Valves |
| Valve & Fan Relay Amps* | Resistance: 4A, Inductive: 3A | |
| Temperature Control | Range: 5°C ~ 35°C | |
| Mode | Heat, Cool, Ventilation | |
| Fan Mode | Low, Medium, High, Auto | |
| Others |
|
|
| Sensor | ||
| Temperature Operating Principle | Digital CMOSens® technology (MEMS) | |
| Temperature Range | -20°C ~ 60°C | |
| Temperature Accuracy | ± 0.5°C (0°C ~ 60°C), ± 1°C (-20°C ~ 0°C) | |
| Temperature Resolution | 0.1°C | |
| Humidity Operating Principle | Digital CMOSens® technology (MEMS) | |
| Humidity Range | 0% - 100% RH | |
| Humidity Accuracy | Typical ± 2% RH, Max. ± 5% RH | |
| Humidity 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 | |
| Power Consumption | < 2W (Without loads) | |
| 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 | 86 x 86 x 42 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 | |
Wiring Diagrams
WT303
- 2-pipe, 2-Wire On/Off Valve, 3 Speed Fan
- 2-pipe, 3-Wire On/Off Valve, 3 Speed Fan
- 4-pipe, 2-Wire On/Off Valve, 3 Speed Fan
WT304
- 2-pipe, 0-10V Valve, 3 Speed Fan
- 4-pipe, 0-10V Valve, 3 Speed Fan
- 3-pipe, 2-Wire On/Off Valve, EC Fan
- 4-pipe, 2-Wire On/Off Valve, EC Fan
- 2-pipe, 3-Wire On/Off Valve, EC Fan
- 2-pipe, 0-10V Valve, EC Fan
Dimensions (mm)
Thermostat Unit: 86 x 86 x 42 mm
Wall Plate (Optional): 106 x 83.5 mm (outer dimensions), 60 x 60 mm (inner mounting area), 4 mm thickness.
Outer Casing: 150 x 125 mm, 6 mm thickness.
