Quick Summary
HTW-WF11-FC-4N is a Modbus Thermostat for 4-pipe fan coil systems. It controls a 3-speed fan and two on/off valves. Heating and cooling are managed independently. It supports Modbus group control and NTC sensing. Key functions include set-point limitation, time display, and keylock.
This page explains how this Fan Coil Thermostat works in real projects. It covers function meaning, control logic, technical parameters, common issues, and possible customisation options.
(01) 4-Pipe Independent Valve Control
This Fan Coil thermostat controls heating and cooling valves separately, avoiding the need for seasonal manual changeover and ensuring stable switching for reliable room temperature management.
(02) 3-Speed Fan Relay Output
This Modbus thermostat with three fan speeds allows flexible airflow control and is easy to wire and maintain, fitting most traditional fan coil motors.
(03) Modbus Group Control
RS485 Modbus communication lets multiple units be monitored together, reducing site visits and manual adjustments, and simplifying project deployment and central supervision.
(04) Set-Point Limitation
Set-point limits prevent excessive cooling or heating, helping save energy, protect the HVAC system, and ensure stable, comfortable room environments for occupants.
(05) Keylock Function
Keylock prevents accidental changes in public areas, simplifies management for building or hotel staff, and improves operational safety while reducing energy waste.
Display
Specifications
| Parameter | Value |
|---|---|
| Power Supply | 95~240Vac, 50/60Hz |
| Current Load | Fan Relay 5A; Valve Relay 5A |
| Built-in Sensor | NTC3950, 10K |
| Temperature Accuracy | ±0.5°C |
| Set-Point Range | 5~35°C |
| Protection Class | IP20 |
| Warranty | 2 Year |
| Installation Box | EU round box or Standard 86x86mm Box |
Wiring
Guide
| 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 = 4N, it stands for a 3-speed fan, 4-pipe system with on/off valve control and Modbus communication. Most sub-models are ready-made. Kindly contact us to confirm availability.
Project Fit & Customization
This Modbus Thermostat is not suitable for systems needing 0–10V modulating valves, BACnet protocol, or advanced graphical BMS integration. Relay-based design fits standard FCU wiring and IP20 environments.
Despite these limits, ODM function discussion is possible. Communication parameters, firmware logic, or group control behaviour can be adjusted for project requirements. Custom development is evaluated case by case.
OEM customisation is also supported, including logo printing, label adjustment, packaging design, and colour modification. Project identification marks or private branding can be arranged under confirmed production quantities.
Frequently Asked Questions
1. Can this thermostat be integrated into a BMS system?
Yes, this Modbus thermostat supports RS485 communication for integration with basic BMS systems. Fan coil thermostat units can be monitored and controlled together, while complex BMS functions depend on system design.
2. Is it suitable for 2-pipe systems?
This specific fan coil thermostat model is 4-pipe only. Other HTW-WF11 sub-models of Modbus thermostat are available for 2-pipe systems if required.
3. Does it require seasonal manual changeover?
No, heating and cooling valves are independently controlled in 4-pipe fan coil thermostat setups.
4. What is the minimum order quantity?
Sample orders of this Modbus thermostat are supported. Standard MOQ is around 300 units, but smaller trial quantities of fan coil thermostat models can be discussed.
5. How can we place an order?
Contact us to confirm requirements for your fan coil thermostat project. A proforma invoice will be issued; payment supports TT, PayPal, Visa, with terms EXW, FOB, DAP, and more.
6. How is shipment arranged?
Express delivery of the Modbus thermostat is usually recommended, around 7 days. Air freight is similar, while sea freight takes about one month, depending on destination.
For project discussions, system matching advice, or application confirmation, please contact us directly~
