Quick Summary
The HTW-WF11-FC-4KN room thermostat is designed for 4-pipe fan coil systems. It controls a 3-speed fan and separate heating and cooling valves. The unit supports both heating and cooling modes with stable switching. It includes keycard input and Modbus communication for system-level control and monitoring.
This page explains how the room thermostat works in FCU control systems. It outlines control logic, parameter settings, and wiring structure. It also covers common application questions and project considerations. Basic customisation options are included for project matching and integration needs.
Key Functional Highlights
(This section introduces the main control functions and their engineering value in the specific HVAC system.)
(01) 3-speed fan control
The thermostat manages low, medium, and high fan speeds. This helps balance airflow with real-time room demand. It improves comfort while reducing unnecessary energy use.
(02) 4-pipe on/off valve control
Separate control of heating and cooling valves ensures clear system logic. This avoids conflicts between heating and cooling demands. It supports stable operation in mixed-use buildings.
If one is looking for the 2-pipe on/off valve control instead, one may refer to this model (please click → HTW-WF11-FC-2KN).
(03) Remote setback (Keycard)
The keycard function detects room occupancy status. When the card is removed, the system reduces output. This helps save energy and avoids unnecessary operation.
(04) RS485 Modbus communication
Modbus enables connection to a building management system. It allows central monitoring and control of multiple units. This improves maintenance efficiency and system visibility.
(05) Set-point limitation
The set-point limitation function defines minimum and maximum temperature ranges. This prevents users from selecting extreme settings during operation.
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 | 95~240Vac, 50/60Hz |
| Current Load | Fan 5A; Valve Relay 5A |
| Built-in Sensor | NTC3950, 10K |
| Temperature Accuracy | ±0.5°C |
| Set-Point Range | 5~35°C |
| Warranty | 2 Year |
| Installation Box | EU round box or Standard 86×86mm Box |
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 & Customization
(This section describes project suitability, system limitations, and available customization options.)
This room thermostat is not suitable for EC fan systems with 0–10V control. It does not support BACnet or wireless communication. It is not designed for underfloor heating or boiler-only systems.
Despite these limitations mentioned above, function upgrades can be discussed. Wi-Fi or BACnet communication may be added in customised versions. External sensor or control logic changes can also be evaluated.
OEM customisation is available for project branding needs. This includes logo printing, housing colour, and packaging labels. Interface layout adjustments may also be discussed for specific markets.
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 thermostat work with a 2-pipe system?
This model is designed for 4-pipe systems only. It controls heating and cooling valves separately. For 2-pipe systems, other models are recommended.
Q2: Can it connect to a BMS system?
Yes, it supports RS485 Modbus communication. It can be integrated into a BMS. This allows central monitoring and control.
Q3: Does it support an external sensor?
This version uses a built-in temperature sensor only. External sensor support is not included. Custom options may be discussed if required. Our HTW-WF11-FC-2NE (please click it directly) features an external sensor and Modbus function; one may refer to it if interested.
Q4: Is the keycard function useful in hotel projects?
Yes, it helps detect room occupancy status. The system reduces operation when the card is removed. This improves energy efficiency in hotel rooms.
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 may be discussed.
Q6: How do we place an order and arrange shipping?
Contact us to confirm requirements and receive a PI. Payment supports TT, PayPal, and Visa. Terms include EXW, FOB, and DAP.
Q7: How long does production take?
Standard samples are ready within 7 days. Custom orders need evaluation and usually take 3–5 weeks. Bulk orders around 300 units take about one month.
Q8: What shipping methods are available?
Courier delivery takes about 7 days door-to-door. Air freight is similar in timing. Sea freight takes about one month, depending on the destination.
Need Help Choosing the Right Model?
If you are unsure which room thermostat fits your project, please feel free to contact us. We can review your system and suggest suitable options~
Related Thermostat Models
For more details, please click here directly: Wi-Fi Thermostats | Modbus Thermostats | BACnet Thermostats
Final Note
In FCU projects, stable temperature control and clear system logic are important. This room thermostat manages fan coil operation and valve switching reliably. It supports central monitoring through Modbus, helping improve maintenance efficiency and overall system control.
