Quick Summary
HTW-FT03-2E is an External sensor thermostat designed for 2-pipe fan coil systems. It controls a 3-speed fan and two wired heating/cooling motorised valves under heating or cooling mode. Powered by 100–250VAC, this External sensor thermostat supports stable temperature sensing via an external probe, improving measurement flexibility in room control projects.
This page explains its control logic, wiring reference, key technical parameters and model configuration meaning. It also outlines project suitability, limits and customisation possibilities, followed by typical project questions and answers.
Key Functional Highlights
(This section explains the core control functions and their practical value.)
(01) External Sensor Temperature Detection
The External sensor thermostat supports an external probe, allowing temperature sensing away from the installation position. This improves measurement accuracy in return-air control or concealed mounting situations.
(02) 2-Pipe Heating and Cooling Logic
Designed for 2-pipe systems, the thermostat manages seasonal heating and cooling through on/off valve control. This simplifies commissioning in standard commercial FCU deployments. Here is the same model with WiFi function you might interested in: HTW-FT03-2W.
(03) Independent Fan and Valve Relay Output
Separate fan and valve relays ensure stable electrical isolation. This design improves operational safety and reduces long-term relay stress in continuous hotel or office applications.
(04) Wide Voltage Power Supply
With 100–250VAC input compatibility, this External sensor thermostat supports varied regional standards. It reduces project risk during international deployment and simplifies procurement planning.
Display
(This section shows the product’s dimensions and the interface layout.)
The thermostat is available in white or black finish. The front interface presents clear temperature indication and mode status. It fits EU or standard electric box housing for straightforward wall installation. Compact structure and fireproof PC+ABS housing improve durability in indoor environments.
Product Angles
Dimensions and Screen Layout
Specifications
(This section lists the key parameters for reference and project confirmation.)
| Parameter | Value |
|---|---|
| Power Supply | 100–250VAC |
| Frequency | 50/60Hz |
| Fan Relay Load | 5A (3A inductive) |
| Valve Relay Load | 3A (1A inductive) |
| Accuracy | ±0.5°C or ±1°F |
| Setpoint Range | 5–35°C |
| Display Range | 5–99°C |
| Protection Class | IP20 |
Wiring
(This section provides the wiring reference diagram for correct installation.)
The HTW-FT03-2E External sensor thermostat uses direct relay outputs for fan speed control and on/off motorised valves. Proper separation between fan and valve terminals should be maintained during installation. The external sensor wiring should follow polarity and shielding recommendations for stable signal transmission.
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 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 & Customisation
(This section explains where the product can be used, its limits, and OEM/ODM options.)
HTW-FT03-2E is suitable for standard 2-pipe FCU systems in hotels, apartments and small commercial rooms. As a standalone External sensor thermostat, it is not designed for central BMS integration or complex building-wide communication systems. Projects requiring network supervision or multi-zone central control should consider communication-enabled models.
Despite these limits mentioned above, functional adjustments can be discussed for project matching. ODM options may include interface adjustment, temperature range modification or sensor logic adaptation, depending on feasibility and quantity. Engineering discussion is required before confirmation.
OEM services are supported. Logo printing, label design, colour customisation and packaging adjustment can be arranged according to project requirements.
Certifications
Certifications
Exhibition Moments
Exhibition Moments
Frequently Asked Questions
Q1. Is this thermostat suitable for 4-pipe FCU systems?
No. HTW-FT03-2E is designed specifically for 2-pipe systems with on/off valve control.
Q2. Can the external sensor replace the internal sensing completely?
Yes. The External sensor thermostat can prioritise the external probe for temperature detection when properly wired.
Q3. Does it support BMS communication such as Modbus or BACnet?
No. This model is a standalone relay type without communication protocol integration.
Q4. What is the minimum order quantity? Can I order samples?
Sample orders are supported. Standard MOQ is 300 units, though smaller trial quantities can be discussed.
Q5. How can I place an order?
Please contact us to confirm requirements. We will issue a proforma invoice. Payment supports TT, PayPal, Visa and terms such as EXW, FOB or DAP.
Q6. How is the product shipped?
Courier door-to-door service is usually recommended and takes about 7 days. Air freight is similar. Sea freight requires over one month depending on destination.
Need Project Support?
If you are selecting an External sensor thermostat for a 2-pipe FCU project, feel free to contact us for application confirmation or configuration advice. We are pleased to support technical discussion before ordering.
