WT304 – Smart Thermostat for 2/4 Pipe Fan Coils – Milesight
 General Description
 Milesight 's WT304 is a smart thermostat designed for 2-pipe and 4-pipe fan coil units (FCUs) with multi-speed or EC (0-10V) fans. It combines precise temperature and humidity control with advanced features such as open window detection, frost protection, local scheduling, and compatibility with LoRaWAN® and Milesight D2D protocols. Its 2.7" E-ink display ensures optimal readability with low power consumption.
 Targeted Applications
-  Temperature control in commercial or residential buildings
 
 - Regulation of 2 or 4-pipe fan coil units
 
-  Connected energy management projects via LoRaWAN®
 
-  Hotel solutions with card detection (digital entry)
 
 Highlights
-  2-tube and 4-tube FCU support, EC or 1-3 speed fans
 
-  High-precision CMOSens® temperature and humidity sensors
 
-  Advanced functions: scheduling, antifreeze, open window detection
 
-  2.7" black and white E-ink display
 
-  LoRaWAN® Class C and Milesight D2D connectivity
 
-  NFC or USB Type-C configuration
 
 Technical Specifications 
|  Wireless Transmission | 
|  Technology | 
 LoRaWAN®, Milesight D2D | 
|  Frequencies | 
 CN470 / EU868 / RU864 / IN865 / AU915 / US915 / KR920 / AS923-1/2/3/4 | 
|  Transmit power | 
 16 dBm (868 MHz) / 19 dBm (470 MHz) / 22 dBm (915 MHz) | 
|  Sensitivity | 
 -137 dBm | 
|  Fashion | 
 OTAA / ABP – Class C | 
|  Thermostat Features | 
|  Compatibility | 
 2 and 4-tube FCUs with EC fans (0-10V) or 1–3 speeds | 
|  Types of valves | 
 0–10V proportional, motorized On/Off 2 or 3 wires | 
|  Temperature modes | 
 Heating, Cooling, Ventilation | 
|  Ventilation modes | 
 Low, Medium, High, Auto | 
|  Entrances | 
 1 × NTC 10kΩ, 1 × DI (dry contact for card switch) | 
|  Advanced functions | 
 Local planning, frost protection, open window detection, fan delay, dehumidification | 
|  Integrated Sensors | 
|  Temperature – Range | 
 -20°C to +60°C | 
|  Temperature – Accuracy | 
 ±0.5°C (0 to 60°C), ±1°C (-20 to 0°C) | 
|  Temperature – Resolution | 
 0.1°C | 
|  Humidity – Beach | 
 0% to 100% RH | 
|  Humidity – Accuracy | 
 ±2% RH typ., ±5% RH max. | 
|  Humidity – Resolution | 
 0.1% RH | 
|  Display & Configuration | 
|  Display | 
 2.7" black & white E-ink display | 
|  Buttons | 
 5 physical buttons (On/Off, Temp +/–, modes, reset) | 
|  Indicator | 
 1 × reset/reboot LED | 
|  Configuration | 
 NFC via mobile app or USB Type-C | 
|  Physical Characteristics | 
|  Food | 
 100–240 VAC, 50/60 Hz | 
|  Operating temperature | 
 -20°C to +60°C (Screen: 0°C to +40°C) | 
|  Relative humidity | 
 0% to 95% (non-condensing) | 
|  Protection index | 
 IP20 | 
|  Material and color | 
 PC + ABS (UL94 V0), white | 
 | Dimensions | 
 86 × 86 × 42 mm | 
|  Facility | 
 86 mm square or 60 mm round wall box – 118/120 plates optional | 
|  Login | 
 AWG 14–26 wires | 
 Interfaces and Connectors
 The WT304 features an E-ink display and five buttons for complete local control (system, temperature, modes). It can be configured via NFC or USB Type-C. It supports EC or multi-speed fans as well as various types of valves.
 Pack Contents
-  1 × WT304 Smart Thermostat
 
-  1 × User Guide
 
-  1 × Wall Mounting Kit