Quick Summary
HTW-WF11-FC-4ENS1W is a wifi HVAC thermostat for fan coil units. It controls 3-speed AC fan motors and on/off valves. It also includes external sensor input, RS485 Modbus communication and a Wi-Fi feature that enables app control and scheduling functions.
This page explains control logic, key functions, and parameters. It also covers common questions and possible project customisation.
Key Functional Highlights
(This section introduces the main control functions and their engineering value in the specific HVAC system, especially how this wifi HVAC thermostat supports stable FCU operation.)
(1) 3-Speed Fan Control
This wifi HVAC thermostat supports three fixed fan speeds for AC fan motors. It helps match airflow with room demand under different load conditions. This improves comfort and reduces unnecessary energy use during part-load operation.
If one is looking for EC fan control, one may refer to this model instead (please click → HTW-FC08-ECNW).
(2) 2/4 Pipe Valve Logic
The thermostat supports both 2-pipe and 4-pipe systems with on/off valve control. It allows flexible configuration during installation without hardware changes. This reduces selection mistakes and simplifies stock planning for multi-project use.
(3) External Sensor Input
An external sensor can be connected for more accurate temperature sensing. It enables automatic heating and cooling changeover based on real conditions. This improves system response and avoids manual switching errors in seasonal transitions.
(4) RS485 Modbus Communication
RS485 Modbus allows integration with building management systems. It enables central monitoring and control across multiple zones. This supports facility management teams with real-time data and stable system coordination.
(5) Wi-Fi App Control
This wifi HVAC thermostat supports app control for remote access and scheduling. Users can adjust settings without physical access to the device. This improves convenience and reduces maintenance visits in large buildings.
Product Design and Display
(This section shows the thermostat appearance, screen interface, or installation dimensions of this specific model, including how the wifi HVAC thermostat fits typical wall installations.)
Technical Specifications
(This section lists the key technical parameters relevant to this thermostat model, including essential details for selecting a wifi HVAC thermostat.)
| Parameter | Value |
|---|---|
| Power Supply | 100~240Vac, 50/60Hz |
| Current Load | 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 86x86mm |
Wiring Diagram
(This section provides the wiring diagram for this thermostat in the relevant HVAC control system, showing typical connections for a wifi HVAC thermostat.)
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 please feel free to get in touch with us to confirm availability. | |
Project Fit & Customization
(This section describes project suitability, system limitations, and available customization options for this wifi HVAC thermostat.)
This model is not suitable for EC fan motor systems. It does not support 0–10V modulating valve control. It is also not designed for low-voltage 24V-only powered projects or fully standalone use without communication needs.
Despite these limitations mentioned above, we can support function customisation. Wi-Fi, Modbus, or sensor logic can be adjusted based on project needs. We can also discuss firmware changes together within reasonable technical scope.
OEM options are also available for branding and appearance changes. This includes logo printing, label design, and colour adjustments. Packaging and user interface language can also be customised for different 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 both 2-pipe and 4-pipe systems?
Yes, it supports both system types with on/off valve control. The configuration can be set during installation. This makes it flexible for different project layouts.
Q2: Does it support BMS integration?
Yes, RS485 Modbus is available for system integration. It allows central monitoring and remote control. This is useful for hotels and commercial buildings.
Q3: How does the external sensor improve performance?
The external sensor provides more accurate room temperature detection. It helps enable automatic heating and cooling switching. This reduces manual adjustment and improves system stability.
Q4: Can Wi-Fi and Modbus work at the same time?
Yes, both communication methods can be used together. Wi-Fi is mainly for app control. Modbus is used for system-level integration.
Q5: What is the MOQ and do you support samples?
Yes, we support samples for testing. The usual MOQ is 300 units. Smaller trial orders like 100 units can also be discussed.
Q6: How to place an order and arrange shipment?
Please feel free to get in touch with us to confirm requirements. We will provide a PI after details are agreed. Payment methods include TT, PayPal, and Visa, with EXW, FOB, or DAP terms.
Q7: How long does production take?
Non-custom samples are usually ready within 7 days. Custom orders need evaluation and programming changes, usually 3–5 weeks. A batch of 300 units typically takes about one month.
Q8: What shipping methods are available?
Express delivery is commonly used and takes about 7 days. Air freight is similar in time. Sea shipping takes around one month depending on destination.
Need Help Choosing the Right Model?
If you are unsure which model fits your project, please feel free to get in touch with us. We can help 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 room control and simple system management are key goals. This wifi HVAC thermostat manages fan speed, valve control, and communication functions within the system. It helps improve daily operation stability and supports efficient facility management across multiple zones.
