Quick Summary
HTW-31-F17-2IE is a digital House Thermostat designed for 2-pipe fan coil systems operating in cooling mode. It controls a 3-speed fan and supports on/off valve control with optional 0–10V valve output. The unit operates on 100–240Vac and allows configuration of both internal and external temperature sensors. It maintains room temperature by switching fan speeds and controlling valve output according to measured demand.
This page explains how this House Thermostat functions within a fan coil system, including wiring reference, technical data confirmation, model code guidance, project customisation options, and common deployment questions for engineering evaluation.
Key Functional Highlights
(This section explains the core control functions and their practical value.)
(1) 2-Pipe Cooling Control Logic
This House Thermostat is engineered for standard 2-pipe cooling FCU systems. It ensures stable chilled water control by switching the fan and valve based on real-time room temperature demand.
(2) Three-Speed Fan Regulation
The thermostat manages low, medium, and high fan speeds. This allows proper airflow balancing during commissioning and helps reduce noise while maintaining consistent indoor comfort.
(3) Power Failure Memory
After power interruption, the House Thermostat restores previous settings automatically. This avoids manual reset and ensures operational continuity in apartments, offices, and managed residential buildings.
(4) Internal / External Sensor Selection
The thermostat can operate with either built-in or external temperature sensors. This improves measurement accuracy where wall heat influence or airflow conditions may affect stability.
Display
(The product’s dimensions and the interface layout.)
Specifications
(This section lists the key parameters for reference and project confirmation.)
| Parameter | Value |
|---|---|
| Power Supply | 100–240Vac |
| Frequency | 50/60Hz |
| Accuracy | ±1°C (0.5°C step) |
| Power Consumption | 1.5A |
| Setpoint Range | 10–30°C |
| Ambient Temperature | 0–50°C |
| Protection Class | IP30 |
| Relative Humidity | 85% |
Wiring
(This section provides the wiring reference diagram for correct installation.)
Guide
(This section explains what configuration the model code refers to.)
| Fan coil series | xx stands for |
|---|---|
| 2/4 | 2 for 2-pipe on/off; 4 for 4-pipe on/off system |
| M | Modulating valve control |
| W | Wi-Fi |
| N | N for Modbus |
| K/E | K for Keycard; E for External sensor |
| Example HTW-31-F17-xx | If xx = 2E, it stands for a 3-speed fan, 2-pipe system with on/off valve control, external sensor function. 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 House Thermostat is suitable for standard 2-pipe cooling fan coil systems using on/off valve logic. It is not designed for 4-pipe changeover systems or complex BMS integration requiring Modbus or BACnet communication. Heating mode projects are outside its default configuration.
Despite these limits mentioned above, ODM functional customisation can be discussed. Heating logic, communication integration, or alternative output configurations may be evaluated depending on project volume and engineering feasibility.
OEM services are supported, including logo printing, panel colour adjustment, private labelling, and customised packaging. Final artwork and technical confirmation are required before production.
Certifications
Exhibition Moments
Frequently Asked Questions
Q1. Is this House Thermostat suitable for a 4-pipe FCU system?
No. This model is configured for 2-pipe cooling-only systems. Alternative models should be selected for 4-pipe applications. (if you need 4 Pipe with sensor please click here)
Q2. Can it control a modulating valve directly?
Standard version supports on/off control. A 0–10V valve output option may be discussed depending on project requirements.
Q3. Can an external temperature sensor be connected?
Yes. The thermostat allows switching between internal and external sensors for improved temperature stability.
Q4. What is the MOQ and are samples available?
Samples are supported. Standard MOQ is 300 pieces. Smaller quantities can be discussed for initial cooperation.
Q5. How can I place an order?
Please contact us to confirm requirements. A proforma invoice will be issued. Payment supports TT, PayPal, Visa. Terms include EXW, FOB, DAP and more.
Q6. How will the goods be shipped?
Courier delivery is recommended, usually taking around 7 days. Air freight is similar. Sea freight takes about one month depending on destination.
For 2-pipe FCU cooling projects, a House Thermostat should be selected by system type, fan speed, valve output, sensor position, and installation conditions. The HTW-31-F17-2IE is suitable for projects that need 3-speed fan control, on/off valve control, optional 0–10V valve output, and internal or external temperature sensing. For OEM buyers, contractors, and distributors, confirming wiring, control logic, installation box, and project quantity before ordering will help reduce selection mistakes.
Need Project Support?
If you are selecting a House Thermostat for a fan coil project, please contact us for configuration confirmation and technical assistance.
