Quick Summary
The HTW-WF02-FC-MN Modulating Thermostat with Modbus is designed for 2-pipe fan coil systems using 0–10V modulating valve control. It supports 3-speed fan operation and precise valve output for heating and cooling adjustment. The thermostat integrates RS485 Modbus communication, enabling central monitoring and stable control in building systems.
This page explains how the Modulating Thermostat with Modbus works in FCU systems and why modulating control improves temperature stability. It also includes wiring reference, key parameters, and model selection guidance, followed by project considerations, customisation options, and practical questions with clear answers.
Key Features
(This section explains the core control functions and their practical value.)
(01) 0–10V modulating valve control
The Modulating Thermostat with Modbus supports 0–10V output for valve control. This allows gradual adjustment of water flow, improving comfort and reducing temperature fluctuation in operation.
(02) Modbus RS485 communication
The Modulating Thermostat with Modbus supports RS485 communication. This enables central control and monitoring through BMS, helping manage multiple rooms with consistent system logic. If you need only WiFi function, please refer to this link: HTW-WF02-FC-2W.
(03) 3-speed fan control
Three fan speeds provide flexible airflow control. This helps balance noise and performance while maintaining stable indoor comfort across different operating conditions.
(04) VA display interface
The VA screen provides clear information display. This improves usability during installation and operation, helping users quickly understand system status and settings.
Product Design and Display
(This section shows the product’s dimensions and the interface layout.)
Technical Specifications
(This section lists the key parameters for reference and project confirmation.)
| Power Supply | 95~240Vac |
| Frequency | 50/60Hz |
| Fan Relay Load | 5A (3A inductive) |
| Valve Output | 0–10V modulating |
| Accuracy | ±0.5°C or ±1°F |
| Sensor | NTC3950, 10K |
| Setpoint Range | 5~35°C |
| Installation | EU or standard electric box |
Wiring Diagram
(This section provides the wiring reference diagram for correct installation.)
Model Code Guide
(This section explains what configuration the model code refers to.)
| Fan coil series | xx stands for |
| EC | EC fan |
| 2/4 | 2 for 2-pipe on/off; 4 for 4-pipe on/off system |
| M | Modulating valve control |
| W | Wi-Fi |
| N/B | N for Modbus; B for BACnet |
| K/E | K for Keycard; E for External sensor |
| Example | HTW-WF02-FC-xx: if xx = MN, it stands for a modulating valve control system with Modbus communication. Most sub-models are ready-made. Kindly contact us to confirm availability. |
Project Fit & Customization
(This section explains where the product can be used, its limits, and OEM/ODM options.)
The Modulating Thermostat with Modbus is suitable for FCU systems requiring precise temperature control and BMS integration. It is not suitable for simple on/off valve systems or standalone-only projects.
Despite these limits mentioned above, ODM customisation can be discussed based on project needs. Control logic, communication protocols, or interface options may be adjusted where feasible depending on system compatibility.
OEM customisation is also supported. Options include logo printing, colour customisation, and label design. These help align the thermostat with project branding and installation requirements.
Certificates and Compliance
Frequently Asked Questions
Q1. Can this thermostat be used with on/off valves?
No, this model is designed for 0–10V modulating valve control systems.
Q2. Does it support building management systems?
Yes, the Modulating Thermostat with Modbus supports RS485 communication for central control and monitoring.
Q3. What is the benefit of modulating control?
Modulating control allows smoother temperature adjustment and reduces fluctuation compared with on/off control systems.
Q4. Do you support samples and what is the MOQ?
Yes, samples are available. MOQ is usually 300 units, but smaller quantities can be discussed.
Q5. How can we place an order?
Please contact us to confirm requirements. We will issue a PI. Payment supports TT, PayPal, Visa. Terms include EXW, FOB, DAP.
Q6. How will the goods be shipped?
Courier delivery takes about 7 days. Air freight is similar. Sea shipping usually takes over one month depending on destination.
Related Thermostat Models
For on/off control systems, you may refer to /products/htw-wf02-fc-2n, or contact us for project selection support. Please refer to below links:
The Modulating Thermostat with Modbus suits FCU systems requiring precise control and central management. It supports stable operation. It helps improve comfort and system efficiency. 【More models: fan coil thermostat】
