Quick Summary
The HTW-WF03-FC-2N Modbus Thermostat for 2 Pipe is designed for fan coil systems using a shared water loop for heating and cooling. It controls a 3-speed fan and two motorised valves with on/off logic. The built-in RS485 communication allows integration into BMS systems for central control and monitoring.
This page explains how the Modbus Thermostat for 2 Pipe works in FCU systems and how it fits common building control requirements. It also includes wiring reference, technical parameters, and model guidance, followed by project considerations, customisation options, and practical questions with clear answers.
Key Features
(This section explains the core control functions and their practical value.)
(01) Modbus communication for BMS
The Modbus Thermostat for 2 Pipe supports RS485 communication. This allows integration with building management systems for remote monitoring, central control, and improved system coordination. If you need the standalone model, please refer to this link: HTW-WF03-FC-2.
(02) 2-pipe system control logic
The Modbus Thermostat for 2 Pipe works with shared heating and cooling water circuits. This simplifies piping design and helps reduce installation and maintenance complexity.
(03) On/off valve control
The Modbus Thermostat for 2 Pipe uses standard on/off control for motorised valves. This ensures compatibility with common FCU configurations and provides stable system operation.
(04) 3-speed fan control
Three fan speeds provide flexible airflow adjustment. This helps maintain indoor comfort while balancing noise level and energy use across different operating conditions.
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.)
| 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 |
| Sensor | NTC3950, 10K |
| Setpoint Range | 5~35°C |
| Installation | EU or standard electric box |
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-WF03-FC-xx: if xx = 2N, it stands for a 2-pipe system with on/off valve control 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.)
The Modbus Thermostat for 2 Pipe is suitable for FCU systems requiring central monitoring and control through BMS. It is not suitable for projects needing BACnet protocol or advanced modulating valve control.
Despite these limits mentioned above, ODM customisation can be discussed based on project needs. Communication protocols or interface design may be adjusted depending on system requirements.
OEM customisation is also supported. Options include logo printing, colour customisation, and label design. These help align the thermostat with project branding and installation standards.
Certificates and Compliance
Frequently Asked Questions
Q1. Can this thermostat connect to a BMS?
Yes, it supports RS485 Modbus communication for integration with building management systems.
Q2. Is it suitable for 4-pipe systems?
No, this model is designed for 2-pipe systems with shared heating and cooling circuits.
Q3. What type of valve control is used?
It uses on/off control for motorised valves, suitable for standard FCU system configurations.
Q4. Do you support samples and what is the MOQ?
Yes, samples are available. MOQ is usually 300 units, but smaller quantities can be discussed.
Q5. How can we place an order?
Please contact us to confirm requirements. We will issue a PI. Payment supports TT, PayPal, Visa. Terms include EXW, FOB, DAP.
Q6. How will the goods be shipped?
Courier delivery takes about 7 days. Air freight is similar. Sea shipping usually takes over one month depending on destination.
Related Thermostat Models
For standalone versions, you may refer to /products/htw-wf03-fc-2, or contact us for project selection support. You can refer to below links:
The Modbus Thermostat for 2 Pipe fits FCU projects needing central control. It supports stable operation. It helps improve system management and temperature consistency. 【More models: fan coil thermostat】
