Quick Summary
The HTW-WF03-FC-2 2 Pipe Thermostat is designed for fan coil systems using a shared water loop for heating and cooling. It controls a 3-speed fan and two wired motorised valves, providing stable switching between heating and cooling modes. The control logic is simple and reliable, making it suitable for standard FCU applications.
This page explains how the 2 Pipe Thermostat works in FCU systems and why it fits common project layouts. 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) 2-pipe system compatibility
The 2 Pipe Thermostat is designed for systems using one water loop for both heating and cooling. This simplifies system design and reduces installation complexity in many projects. If you need the thermostat for 4-pipe system, please refer to this link: HTW-WF03-FC-4.
(02) On/off valve control
The 2 Pipe Thermostat controls motorised valves with on/off logic. This matches standard FCU configurations and provides stable and predictable operation during daily use.
(03) 3-speed fan control
Three fan speeds allow flexible airflow adjustment. This helps maintain comfort while balancing noise levels and system efficiency in different room conditions.
(04) Simple standalone operation
The thermostat operates without complex communication systems. This makes it suitable for projects where simple local control is preferred over centralised management.
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 = 2, it stands for a 2-pipe system with on/off valve control. 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 2 Pipe Thermostat is suitable for standard FCU systems using on/off valve control and standalone operation. It is not suitable for projects requiring Modbus, BACnet, or central BMS integration.
Despite these limits mentioned above, ODM customisation can be discussed based on project requirements. Functions such as communication protocol or interface design may be adjusted where feasible.
OEM customisation is also supported. Options include logo printing, colour customisation, and label design. These help match project branding and installation needs.
Certificates and Compliance
Frequently Asked Questions
Q1. Can this thermostat be used in 4-pipe systems?
No, this model is designed specifically for 2-pipe systems with shared heating and cooling circuits.
Q2. Does it support remote or BMS control?
No, this is a standalone 2 Pipe Thermostat without communication protocols like Modbus or BACnet.
Q3. What type of valves does it control?
It controls on/off motorised valves, which are commonly used in standard fan coil unit systems.
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 Modbus or WiFi versions, you may refer to /products/htw-wf03-fc-2n, or contact us for project selection support. You can refer to below links:
The 2 Pipe Thermostat suits standard FCU systems with simple control needs. It supports stable operation. It helps maintain comfort and reduce system complexity. 【More models: fan coil thermostat】
