Quick Summary
The HTW-31-F13-2NE Modbus Thermostat With External sensor is designed for 2 pipe fan coil systems. It controls a 3 speed fan and on/off valve, supporting heating and cooling modes. This Modbus Thermostat With External sensor adds external sensor input for auxiliary heating control and stable system response.
This page explains how this Modbus Thermostat With External sensor works in real FCU applications, including control logic, wiring reference, and parameter details. It also highlights project fit, possible customisation, and common questions to support correct product selection.
Key Features
(This section explains the core control functions and their practical value.)
(01) 3-speed fan control with auto adjustment
This Modbus Thermostat With External sensor supports manual and automatic fan speed control. It adjusts airflow based on temperature difference. This improves comfort and reduces unnecessary energy use in daily operation.
(02) 2 pipe system control
This Modbus Thermostat With External sensor is designed for 2 pipe FCU systems. It switches between heating and cooling modes. This simplifies system design and ensures stable seasonal operation. If you need a standalone model, please refer to this link: HTW-31-F13-2.
(03) External sensor for auxiliary control
The external sensor function allows detection of pipe or floor temperature. When preset conditions are met, auxiliary heating can be activated. This improves system protection and control accuracy.
(04) Modbus communication for BMS
With Modbus communication, this Modbus Thermostat With External sensor can connect to a BMS system. It enables central monitoring and control. This is useful in large buildings and managed projects.
Product Design and Display
(This section shows the product’s dimensions and the interface layout.)
Technical Specifications
(This section lists the key parameters for reference and project confirmation.)
| Parameter | Value |
|---|---|
| Power Supply | 100~240Vac |
| Frequency | 50/60Hz |
| Accuracy | ±0.5°C |
| Sensor | NTC 3950, 10K |
| Setpoint Range | 5~50°C |
| Ambient | 0~50°C |
| Backlight | White |
| Protection Class | IP30 |
Wiring Diagram
(This section provides the wiring reference diagram for correct installation.)
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 |
| 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 Modbus Thermostat With External sensor is suitable for 2 pipe FCU systems requiring BMS integration and additional temperature monitoring. It is not suitable for 4 pipe systems or modulating valve control projects.
Despite these limits mentioned above, ODM function customisation can be discussed. This may include control logic adjustments, protocol changes, or sensor configurations based on project requirements.
OEM customisation is also supported. Options include logo printing, colour changes, and packaging design. These help align the product with project branding and market positioning.
Certificates and Compliance
Frequently Asked Questions
Q1: Can this Modbus Thermostat With External sensor connect to BMS?
Yes, it supports Modbus communication and can be integrated into a BMS system for central monitoring.
Q2: What is the role of the external sensor?
The external sensor detects pipe or surface temperature and can trigger auxiliary heating for better control.
Q3: Is it suitable for 2 pipe systems only?
Yes, this model is designed for 2 pipe FCU systems and supports heating and cooling switching.
Q4: What is the MOQ and can we get samples?
We support sample orders. Standard MOQ is 300 units. Smaller quantities may be discussed.
Q5: How do we place an order?
Please contact us with your requirements. We will provide a PI. Payment supports TT, PayPal, Visa. Terms include EXW, FOB, DAP.
Q6: How is delivery arranged?
Courier delivery takes about 7 days. Air freight is similar. Sea shipping takes around one month depending on destination.
Related Thermostat Models
If external sensor or Modbus is not required, simpler models are available. Contact us to confirm the most suitable option for your project. You also can refer to below links:
This Modbus Thermostat With External sensor is suitable for projects needing both BMS integration and additional temperature monitoring. It fits well in controlled environments where stability and protection are important. 【More models: fan coil thermostat】
