Quick Summary
HTW-FT03-FC-2 is a smart 2 pipe thermostat designed for fan coil systems. It controls a three-speed fan and a two-wire on/off motorised valve for heating or cooling changeover. The unit operates on 95–240Vac and supports standard fan coil applications in residential or light commercial projects.
This page explains the control logic, wiring reference, technical parameters and installation method of this smart 2 pipe thermostat. It also clarifies configuration meaning, project limits, and typical questions for deployment confirmation.
Key Functional Highlights
(This section explains the core control functions and their practical value.)
(01) 2-Pipe Heating and Cooling Logic
This smart 2 pipe thermostat manages seasonal heating and cooling through a single water circuit. It ensures correct valve actuation during mode change, reducing commissioning errors and improving operational stability.
(02) Three-Speed Fan Control
The thermostat provides manual or controlled switching between low, medium and high fan speeds. This allows flexible airflow management while maintaining predictable relay loading for the fan coil unit.
(03) On/Off Valve Output
It supports two-wire motorised valve control. Clear relay separation between fan and valve reduces wiring confusion and simplifies installation in standard FCU electrical boxes.
(04) Wide Voltage Compatibility
Operating from 95 to 240Vac, this smart 2 pipe thermostat adapts to different regional supply standards. This reduces SKU variation and simplifies international project deployment.
Display
(This section shows the product’s dimensions and the interface layout.)
The unit is designed for EU or standard electrical wall box installation. The front interface displays room temperature and setpoint clearly. The layout separates temperature display from operating status, allowing users and maintenance staff to read values quickly.
Its housing is made of fireproof PC + ABS material. Protection class is IP20, suitable for indoor dry environments.
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 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 smart 2 pipe thermostat uses separate relay outputs for fan and valve. Live supply must be connected according to rated voltage. Fan outputs correspond to three-speed terminals. Valve output is dedicated for two-wire on/off control.
Correct neutral and live polarity confirmation is recommended before energising the system. Installation should be completed by qualified personnel.
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. |
For projects requiring a 4-pipe version, please refer to the related model HTW-FT03-FC-4 for comparison.
Project Fit & Customization
(This section explains where the product can be used, its limits, and OEM/ODM options.)
This smart 2 pipe thermostat is designed for standard 2-pipe fan coil applications. It is not suitable for 4-pipe systems, modulating valve control, or BMS integration. Projects requiring centralised communication such as Modbus or BACnet should select a communication-enabled model instead.
Despite these limits mentioned above, we can support ODM function customisation where technically feasible. Control logic adjustments, display behaviour refinement, and regional compliance adaptations can be discussed based on project volume and timeline.
OEM services are also supported, including logo printing, colour customisation (white or black), label modification and packaging adjustments for brand projects.
Certifications
Exhibition Moments
Frequently Asked Questions
Q1. Is this thermostat suitable for 4-pipe systems?
No. This model is a smart 2 pipe thermostat designed only for 2-pipe on/off valve systems.
Q2. Can it connect to a building management system?
No. This version is standalone and does not support Modbus or BACnet communication.
Q3. What type of fan can it control?
It controls a standard three-speed AC fan used in typical fan coil units.
Q4. What is the minimum order quantity? Can I order samples?
Samples are supported. Standard MOQ is 300 units, but smaller trial quantities can be discussed.
Q5. How can I place an order?
Please contact us with your requirement. After confirmation, we issue a proforma invoice. Payment supports TT, PayPal, Visa. Terms include EXW, FOB and DAP.
Q6. How is shipment arranged?
Courier door-to-door delivery takes about 7 days. Air freight is similar. Sea freight usually takes over one month, depending on destination.
Need Project Support?
If you are selecting a smart 2 pipe thermostat for a new or retrofit FCU project, kindly contact us. We are pleased to assist with model confirmation and application guidance.
