Quick Summary
HTW-WF11-FC-2NE is a 2-pipe room thermostat designed for standard FCU systems with 3-speed fan control and on/off valve output. It manages cooling and heating logic through a built-in sensor or an external sensor, with RS485 Modbus communication for group control. It supports stable fan switching, valve coordination, central monitoring, and time display for daily operation reference.
This page explains how the room thermostat works in real FCU projects, including control logic meaning, wiring reference, key parameters, configuration guidance, deployment limits, and common project questions.
Key Functional Highlights
(This section explains the core control functions and their practical value.)
(01) 3-Speed Fan and 2-Pipe Valve Logic
This room thermostat separates fan speed selection from valve control output, ensuring clear cooling and heating logic in 2-pipe systems.
If a 4-pipe model is required, please refer to the model HTW-WF11-4ENS (with Modbus and External sensor support).
(02) External Sensor Support
The external sensor function allows temperature detection away from the installation point. This improves measurement accuracy when the thermostat is installed near air supply outlets or heat sources, enhancing control precision and occupant comfort.
(03) RS485 Modbus Group Control
With built-in RS485 Modbus communication, it supports central supervision and grouped adjustment. It simplifies system-level temperature management and allows facility teams to monitor multiple rooms through a BMS platform.
(04) Time Display for Operational Reference
The integrated time display provides daily reference for users and maintenance staff. It supports coordinated scheduling within central systems and improves clarity during commissioning and troubleshooting processes.
Display
(This section shows the product’s dimensions and the interface layout.)
Specifications
(This section lists the key parameters for reference and project confirmation.)
| 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 |
| Communication | RS485 Modbus |
| Warranty | 2 Year |
| Installation Box | EU round box or Standard 86x86mm Box |
Wiring
(This section provides the wiring reference diagram for correct installation.)
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-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 & Customization
(This section explains where the product can be used, its limits, and OEM/ODM options.)
This thermostat is not intended for 4-pipe systems, modulating valve control, or projects demanding BACnet or advanced programmable logic. For such requirements, alternative models should be selected to avoid integration mismatch.
Despite these limits mentioned above, ODM function adjustment can be discussed based on project volume and technical feasibility. Communication settings, firmware parameters, or interface adjustments may be evaluated collaboratively to ensure system compatibility.
OEM customisation is also supported. Logo printing, colour customisation, private labelling, and packaging adjustments can be arranged for bulk orders to align with brand and project requirements.
Certifications
Exhibition Moments
Frequently Asked Questions
Q1: Can this room thermostat be integrated into a BMS system?
Yes. This model supports RS485 Modbus communication, allowing integration with compatible BMS platforms for group control and central monitoring.
Q2: Is it suitable for a 4-pipe FCU system?
No. This room thermostat is designed specifically for 2-pipe on/off valve systems. A dedicated 4-pipe model is required for that application.
Q3: Can the external sensor fully replace the built-in sensor?
Yes. When connected correctly, the external sensor can be used for temperature detection to improve measurement accuracy in complex layouts.
Q4: What is the minimum order quantity? Are samples available?
Samples are supported. The usual minimum order quantity is 300 units, though smaller trial quantities can be discussed depending on availability.
Q5: How can we place an order?
Please contact us with your requirements. After confirmation, we will issue a proforma invoice. Payment methods include TT, Paypal, Visa. Terms support EXW, FOB, DAP and more.
Q6: How is the product shipped?
Express door-to-door delivery is normally recommended and takes around 7 days. Air freight takes similar time. Sea freight usually requires one month or more.
Need Support?
If you are selecting a Modbus room thermostat for your FCU project, please contact us for technical confirmation or integration advice. We are ready to support your application planning.
