Quick Summary
HTW-WF11-FC-4DMN is a fan coil thermostat designed for 4-pipe FCU systems. It controls a 3-speed fan and separate heating and cooling valves. Heating uses on/off control, while cooling uses 0–10V modulation. It also supports Modbus communication for system integration.
This page explains how this fan coil thermostat works in real projects. It covers control logic, wiring, and key parameters. It also answers common questions and shows where Modbus fits. Custom options can be discussed based on project needs.
Key Functional Highlights
(This section introduces the main control functions and their engineering value in this specific HVAC system.)
(01) 3-speed fan + 4-pipe system
This fan coil thermostat supports a full 4-pipe FCU setup. It manages heating and cooling independently. The 3-speed fan helps match airflow with room demand. This improves comfort and reduces unnecessary energy use.
(02) On/off heating valve control
The heating valve uses simple on/off control logic. This keeps the system stable during heating cycles. It is easy to wire and maintain in most projects. This approach is widely used in standard FCU heating setups.
(03) Modulating cooling valve control
Cooling is controlled by a 0–10V modulating signal. This allows smoother temperature adjustment during cooling. It reduces temperature swings and improves comfort. It is suitable for projects requiring better cooling precision.
(04) RS485 Modbus
This fan coil thermostat supports RS485 Modbus communication. It can connect to a BMS for central control. This helps reduce manual checks in large buildings. It also improves monitoring and system coordination.
(05) Set-point limitation
The set-point limitation function restricts the temperature adjustment range. This helps avoid extreme settings by end users, which makes it useful in hotels or shared spaces.
Product Design and Display
(This section shows the thermostat appearance, screen interface, or installation dimensions of this specific model.)
Technical Specifications
(This section lists the key technical parameters relevant to this thermostat model.)
| Parameter | Value |
|---|---|
| Power Supply | 100~250Vac, 50/60Hz |
| Fan Relay Load | 5A |
| Sensor | NTC3950, 10K |
| Temperature Accuracy | ±0.5°C |
| Set-Point Range | 5~35°C |
| Mounting Box | EU round box or 86×86mm |
| Warranty | 2 years |
Wiring Diagram
(This section provides the wiring diagram for this thermostat in the relevant HVAC control system.)
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 |
| 24 | Powered by 24V, or with 24V output for 0-10V valve |
| Example HTW-WF11-FC-xx: if xx = 2EN, it stands for a 3-speed fan, 2-pipe system with on/off valve control, external sensor function, and Modbus communication. Most sub-models are ready-made. Kindly contact us to confirm availability. | |
Project Fit & Customisation
(This section describes project suitability, system limitations, and available customisation options.)
This fan coil thermostat is not suitable for 2-pipe systems. It is also not ideal if only on/off valves are used. Projects without RS485 or BMS do not use the Modbus feature. It is not fit systems needing BACnet or wireless control.
Despite these limits, function upgrades can be discussed. WiFi or BACnet options may be added if needed. Control logic can be adjusted for specific project needs. These options depend on project quantity and technical details.
OEM customisation is also supported for this fan coil thermostat. Logo printing, label design, and colour changes are available. Packaging can also be adjusted based on your market. Please feel free to get in touch with us to discuss details.
Certificates 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: Can this fan coil thermostat work with all 4-pipe FCU systems?
Yes, it is designed for standard 4-pipe FCU systems. It controls heating and cooling valves separately. Please confirm valve type and signal before use.
Q2: Does it support external sensors?
This model uses a built-in temperature sensor. External sensor options may be discussed if needed. It depends on project requirements.
Q3: Can it connect to a BMS system?
Yes, it supports RS485 Modbus communication. It can be integrated into most BMS systems. This allows central monitoring and control.
Q4: How do I choose between on/off and modulating control?
Heating usually works well with on/off control. Cooling benefits from modulating control for better comfort. This model combines both for balanced performance.
Q5: What is the MOQ and can we get samples?
We support sample orders for testing. Standard MOQ is 300 units. Smaller quantities like 100 units can be discussed.
Q6: How do we place an order?
Please share your requirements with us first. We will confirm details and provide a PI. Payment supports TT, PayPal, and Visa.
Q7: How long does it take to prepare?
Standard samples are ready within 7 days. Custom orders need evaluation and usually take 3–5 weeks. Bulk orders like 300 units take about one month.
Q8: How will the goods be shipped?
Courier delivery is commonly used and takes about 7 days. Air freight is similar in timing. Sea shipping takes around one month.
Need Help Choosing the Right Model?
If you are not sure which fan coil thermostat fits your system, please feel free to get in touch with us for simple advice.
Related Thermostat Models
For more details, please click here directly: Wi-Fi Thermostats | Modbus Thermostats | BACnet Thermostats
Final Note
Fan coil systems often require stable temperature control and simple integration. This fan coil thermostat manages fan speed and valve control with Modbus support. It helps improve system stability, supports central monitoring, and makes daily operation easier for facility teams.
