Quick Summary
The HTW-FT03-4WK WiFi Thermostat With Keycard is designed for indoor fan coil unit (FCU) systems in commercial or hospitality buildings. It supports 4-pipe heating and cooling systems, controlling the fan coil unit and two motorised valves for heat and cool operation. The thermostat manages fan speed and valve switching based on the sensed room temperature, ensuring stable thermal control. Integrated WiFi communication allows remote monitoring and adjustment, while the keycard function helps manage energy use in rooms such as hotels or serviced apartments.
This page explains the control logic and practical meaning of the main functions of this WiFi Thermostat With Keycard, together with wiring reference, technical parameters, model code guidance and possible project customisation. Typical project questions are also answered at the end of the page.
Key Functional Highlights
(This section explains the core control functions and their practical value.)
(01) Integrated WiFi communication
The WiFi Thermostat With Keycard supports wireless communication for remote access and basic system management. It allows building operators or users to monitor and adjust temperature settings without accessing the thermostat physically, improving daily operation convenience.
(02) Keycard energy control
The keycard input allows the thermostat to operate only when a room card is inserted. This function is widely used in hotels to avoid unnecessary cooling or heating when the room is empty, helping reduce energy consumption.
(03) 4-pipe heating and cooling control
The thermostat is designed for 4-pipe fan coil systems, controlling separate heating and cooling valves. This configuration allows buildings to supply heating and cooling simultaneously in different rooms, improving comfort in mixed-use environments. If you are interested in standalone model for 4 pipe system, you can refer to this link: HTW-FT03-FC-4.
(04) Fan coil unit management
The controller manages the fan coil unit and motorised valves based on the room temperature signal. Stable relay outputs ensure reliable operation of the fan and valve devices, helping maintain consistent indoor comfort.
Display
(This section shows the product’s dimensions and the interface layout.)
Product Photos (Front / Side / Back)
Dimensions and Screen Display
Specifications
(This section lists the key parameters for reference and project confirmation.)
| Parameter | Value |
|---|---|
| Power Supply | 100–250 Vac |
| Frequency | 50/60 Hz |
| Fan Relay Load | 5A (3A inductive) |
| Valve Relay Load | 3A (1A inductive) |
| Temperature Accuracy | ±0.5°C or ±1°F |
| Sensor | NTC3950, 10K |
| Setpoint Range | 5–35°C |
| Protection Class | IP20 |
Wiring
(This section provides the wiring reference diagram for correct installation.)
Wiring Diagram
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 | 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 WiFi Thermostat With Keycard is suitable for indoor fan coil unit systems where local room temperature control is required. It works well in hotels, serviced apartments, offices and similar buildings using FCU systems. However, it is designed mainly as a standalone room thermostat, so projects requiring deep BMS integration or advanced building automation logic may need additional communication protocols or alternative models.
Despite these limits mentioned above, some ODM function customisation can be discussed according to project needs. Possible adjustments may include communication options, interface layout, control logic changes or additional sensors. Such requests normally require technical discussion to confirm feasibility and production conditions.
In addition, OEM cooperation is also supported. Logo printing, colour customisation, packaging labels and product marking can usually be arranged according to brand requirements. These options help partners integrate the thermostat into their own HVAC product lines.
Certifications
Exhibition Moments
Frequently Asked Questions
Q1. Can this WiFi Thermostat With Keycard work with all fan coil units?
It works with most standard fan coil units using relay control for fan and motorised valves. Wiring and electrical ratings should be checked before installation.
Q2. Does the thermostat support both heating and cooling control?
Yes. This model supports 4-pipe systems and controls separate heating and cooling valves together with the fan coil unit.
Q3. Is WiFi control necessary for normal operation?
No. The thermostat can operate locally without WiFi. WiFi mainly provides remote monitoring and adjustment convenience.
Q4. What is the minimum order quantity and are samples available?
Samples are available. The usual MOQ is around 300 units, but smaller trial quantities can often be discussed.
Q5. How can we place an order?
Please contact us with your requirements. After confirmation we provide a proforma invoice. Payment methods include TT, PayPal, Visa and others.
Q6. How are the products normally shipped?
Courier door-to-door service is usually recommended and takes about 7 days. Air freight is similar, while sea freight normally takes over one month.
Need Project Support?
If you are selecting a WiFi Thermostat With Keycard for a fan coil project, feel free to contact us. Our team can help confirm compatibility and suitable configuration.
