Quick Summary
HTW-EB-FC-4EW is a WiFi Thermostat With External sensor designed for 4-pipe fan coil systems. It controls a 3-speed fan and two wired motorised valves for heating and cooling. The thermostat operates on 95–240Vac and supports heat/cool changeover. It uses an NTC sensor for accurate temperature sensing and provides stable relay output for fan and valve control.
This page explains the control logic, wiring reference, technical parameters, model code structure, and project suitability. It also outlines customisation possibilities and answers typical project questions related to installation and deployment of the WiFi Thermostat With External sensor.
Key Functional Highlights
(This section explains the core control functions and their practical value.)
(01) 4-Pipe Heating and Cooling Control
The thermostat independently controls heating and cooling valves. This allows accurate seasonal operation in 4-pipe FCU projects. It avoids manual changeover and improves operational flexibility in commercial buildings.
(02) External Sensor Support
The external sensor improves temperature sampling reliability. It is useful where installation position may affect accuracy. This enhances system stability and supports corridor or concealed installations.
(03) Stable Relay Output for Fan and Valve
Fan relay capacity up to 5A and valve relay 3A ensures reliable switching. It supports inductive loads. This reduces relay stress and improves long-term operational durability.
(04) Integrated WiFi Communication
WiFi connection enables remote monitoring and adjustment. It supports flexible room management in hotels and apartments. The WiFi Thermostat With External sensor simplifies commissioning without additional BMS wiring.
Display
(This section shows the product’s dimensions and the interface layout.)
The thermostat features a negative black backlight display. The interface shows room temperature, setpoint, working mode, and fan status clearly. The front housing uses fire-resistant PC + ABS material. It fits EU or standard electrical wall boxes.
Specifications
(This section lists the key parameters for reference and project confirmation.)
| Parameter | Value |
|---|---|
| Power Supply | 95–240Vac |
| Frequency | 50/60Hz |
| Fan Relay Load | 5A (3A inductive) |
| Valve Relay Load | 3A (1A inductive) |
| Temperature Accuracy | ±0.5°C |
| Setpoint Range | 5–35°C |
| Sensor Type | NTC3950, 10K |
| Protection Class | IP20 |
Wiring
(This section provides the wiring reference diagram for correct installation.)
The thermostat supports connection to 3-speed fan motors and two wired heating and cooling motorised valves. Neutral and live wiring should follow the installation diagram to ensure correct relay output and system protection.
For 2-pipe systems, please refer to the related model in the same series: HTW-EB-FC-2.
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-EB-FC-xx | If xx = 4EW, it stands for 4-pipe on/off system, WiFi connection, and external sensor support. 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 External sensor is suitable for indoor fan coil systems using on/off valve control. It is not suitable for modulating valve systems unless the “M” version is selected. It is also not intended for central BMS integration unless communication protocol versions are specified.
Despite these limits mentioned above, functional customisation can be discussed. Communication protocol, control logic adjustment, or interface modification may be evaluated based on project quantity and technical feasibility.
OEM customisation is supported. This includes OEM logo printing, colour customisation, private labelling, packaging modification, and label design. All OEM and ODM requests are reviewed to ensure compliance, production stability, and delivery consistency.
Certifications
Exhibition Moments
Frequently Asked Questions
Q1. Is this thermostat suitable for 2-pipe systems?
No. HTW-EB-FC-4EW is designed for 4-pipe systems. For 2-pipe projects, please select the appropriate 2-pipe version.
Q2. Can it control both heating and cooling valves simultaneously?
It controls heating and cooling separately. The thermostat switches output based on operating mode and temperature demand.
Q3. Does the WiFi Thermostat With External sensor require a gateway?
No additional gateway is required. It connects directly via WiFi for remote configuration and control.
Q4. What is the minimum order quantity? Are samples available?
Sample orders are supported. Standard MOQ is around 300 units, but smaller trial quantities can be discussed.
Q5. How can we place an order?
Please contact us with project details. We issue a proforma invoice after confirmation. Payment supports TT, PayPal, Visa. Terms include EXW, FOB, DAP.
Q6. How is shipment arranged?
Express door delivery is commonly used, around 7 days. Air freight also takes about 7 days. Sea freight normally requires one month or more.
Need Project Support?
If you are selecting a WiFi Thermostat With External sensor for a fan coil project, feel free to contact us. We can review your system configuration and provide application guidance.
