Quick Summary
The HTW-WF01-FC-4DMN is designed for fan coil systems that need accurate valve control. It supports 4 pipe heating and cooling systems. It provides digital output for heating and cooling valves. It helps keep room temperature stable in daily use.
This Digital Fan Coil Thermostat is suitable for HVAC projects that need stable control and BMS connection. It supports Modbus communication and flexible valve control. It helps reduce system errors and improve control accuracy. The sections below show how each function works in real projects.

Key Functional Highlights
These functions support stable HVAC operation and clear system control.
(01) Fan coil unit control
The thermostat is designed for fan coil units. It controls fan operation and system response. This helps maintain stable indoor temperature. This thermostat fits common HVAC systems.
(02) 4 pipe heating and cooling system
The thermostat supports 4 pipe systems. Heating and cooling valves work separately. This allows flexible use in different seasons. This thermostat is suitable for buildings with changing loads.
(03) Digital valve output control
The thermostat supports one cooling modulating valve and one heating digital valve output. This allows precise control of water flow. It improves system response. This Digital Fan Coil Thermostat supports stable temperature control.
(04) Multi-valve compatibility
The thermostat can control 2 or 3 wired motorized valves. It supports different valve types. This makes system design more flexible. This thermostat is suitable for many projects.
(05) Modbus communication
The thermostat supports Modbus communication. It connects to BMS systems. This allows central monitoring and control. This thermostat is suitable for large buildings.

Product Design and Display
The design is simple and suitable for indoor use. The interface is clear and easy to read. It fits standard wall boxes. This thermostat is suitable for both residential and commercial use.


Technical Specifications
Key parameters are listed below for installation and system matching.
| Parameter | Value |
|---|---|
| Power Supply | 95–240VAC, 50/60Hz |
| Power Consumption | 5A |
| Set Range | 5–35°C |
| Accuracy | ±0.5°C or ±1°F |
| Installation | 86×86 mm or EU 60mm round box |
| Protection Level | IP20 |
| Shell Material | PC+ABS (Fireproof) |
| Warranty | 2 Years |
Wiring and Installation
The thermostat connects to the fan coil unit and motorized valves. Separate outputs control heating and cooling valves. Modbus connects to the BMS system. This thermostat helps reduce wiring work and improves system control.

Model Code Guide
Understanding the model code helps select the right configuration and avoid mistakes.
| Fan coil series | xx stands for |
| 2 | 2-pipe fan coil system |
| 4 | 4-pipe fan coil system |
| W | WiFi |
| EC | EC fan 0-10V |
| B | BACnet |
| N | Modbus communication |
| K | Keycard |
| E | External sensor |
| M | 0-10V modulating valve |
| Example WF01-FC-XX | If XX=KB, it means 2/4-pipe FCU thermostat with BACnet and external sensor (If you need this, click here) |
Project Fit & Customization
This model is suitable for fan coil HVAC systems with valve control needs. It supports 4 pipe systems and Modbus integration. This Digital Fan Coil Thermostat is used in commercial buildings and hotels.
Some functions can be adjusted. Communication or control logic can be discussed. This Digital Fan Coil Thermostat supports flexible project requirements.
OEM support is available. Logo, colour, and labels can be customised. This Digital Fan Coil Thermostat can match different markets.
Certifications and Compliance
This thermostat complies with European market requirements and is supported by certifications such as CE, RoHS, LVD test reports, EMC test reports, etc.

Exhibition Moments
Our team regularly participates in international HVAC exhibitions such as Febrava in Brazil, The Big 5 in Dubai, and ISK-SODEX in Turkey, etc.

Frequently Asked Questions
Q1: Does it support Modbus communication?
Yes, it supports Modbus. This Digital Fan Coil Thermostat can connect to a BMS system.
Q2: Is it suitable for 4 pipe systems?
Yes, it supports 4 pipe systems. Heating and cooling are controlled separately.
Q3: What type of valves does it support?
It supports 2 or 3 wired motorized valves. It also supports digital valve output.
Q4: Can it control both heating and cooling valves?
Yes, it controls both. This Digital Fan Coil Thermostat manages them separately.
Q5: What is the MOQ and can I get samples?
MOQ is 300 units. Samples are available. Smaller orders can be discussed.
Q6: How to place an order?
Contact us for PI. Payment supports TT and PayPal. Shipping supports EXW, FOB, and DAP.
Q7: How long is the lead time?
Samples take about 7 days. Custom orders take 3–5 weeks. Bulk orders need about one month.
Q8: What shipping options are available?
Express takes about 7 days. Air is similar. Sea shipping takes about one month.
Need Support
If you are selecting a model or planning a project, please contact us. We can help choose the right thermostat.
Related Thermostat Models
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Accurate valve control is important in HVAC systems. This Digital Fan Coil Thermostat supports precise control and system integration. It helps improve comfort and system performance.





