Quick Summary
HTW-31-F17-4E is a Thermostat with Sensor designed for 2-pipe or 4-pipe fan coil systems. It controls three-speed fan motors and one cooling plus one heating valve in on/off mode. The unit supports heating and cooling configuration and operates under 24VAC or 100–240VAC power supply. It is suitable for HVAC projects requiring stable temperature sensing and basic valve switching logic.
This page explains the engineering meaning of each function, wiring reference, technical parameters for confirmation, model code configuration and project customisation options, followed by typical project questions and answers.
Key Functional Highlights
(This section explains the core control functions and their practical value.)
(01) Configurable 2-Pipe / 4-Pipe Logic
This Thermostat with Sensor supports both 2-pipe and 4-pipe systems. It allows engineers to standardise one model across different projects, reducing inventory complexity and commissioning adjustments.(If you need 2 pipe system standalone version, please click here)
(02) Three-Speed Fan and Dual Valve Control
The unit controls low, medium and high fan speeds, plus one cooling and one heating valve. This structure ensures clear separation of cooling and heating circuits in 4-pipe applications.
(03) External Sensor Extension (1m)
The Thermostat with Sensor includes a 1m external sensor and allows 2/4 configuration selection. This improves sensing accuracy in concealed installations or where wall temperature differs from room air temperature.
(04) Stable On/Off Step Control
With ±1°C accuracy and 0.5°C step adjustment, the Thermostat with Sensor provides predictable switching logic. This reduces short cycling and maintains stable room conditions in office or hotel environments.
Display
(This section shows the product’s dimensions and the interface layout.)
The interface displays room temperature and setpoint clearly. ℃ and ℉ are selectable to suit regional standards. Blue backlight ensures visibility in low-light indoor conditions.
Specifications
(This section lists the key parameters for reference and project confirmation.)
| Parameter | Value |
|---|---|
| Power Supply | 24VAC / 100–240VAC |
| Frequency | 50/60Hz |
| Control Type | On/Off |
| Accuracy | ±1°C (0.5°C step) |
| Setpoint Range | 10–30°C |
| Operating Ambient | 0–50°C |
| Protection Class | IP30 |
| Mounting | 86×86mm Junction Box |
Wiring
(This section provides the wiring reference diagram for correct installation.)
Correct wiring ensures proper separation of fan speeds and heating/cooling valve outputs. Always confirm pipe configuration before commissioning.
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 |
| W | Wi-Fi |
| N | N for Modbus |
| K / E | K for Keycard; E for External sensor |
| Example HTW-31-F17-xx: if xx = 4E, it stands for a 3-speed fan, 4-pipe system with on/off valve control and 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 Thermostat with Sensor is suitable for residential apartments, hotels and office fan coil projects using on/off valve control. It is not designed for modulating valves or BMS communication. It also does not support humidity control or advanced scheduling functions.
Despite these limits mentioned above, ODM function adjustment can be discussed. For example, different sensor length, control logic modification or customised temperature limits may be reviewed based on project quantity.
OEM services are available, including logo printing, colour customisation, label redesign and packaging adjustment. All branding changes are subject to drawing confirmation before mass production.
Certifications
Exhibition Moments
Frequently Asked Questions
Q1. Is this Thermostat with Sensor suitable for 4-pipe FCU systems?
Yes. HTW-31-F17-4E supports separate cooling and heating valve outputs for 4-pipe applications with independent fan speed control.
Q2. Can it work in a 2-pipe project?
Yes. The configuration can be set for 2-pipe operation, allowing seasonal heating or cooling switching logic.
Q3. Does it support BMS communication?
No. This model is a standalone Thermostat with Sensor and does not include Modbus or BACnet communication.
Q4. What is the MOQ and can I order samples?
Samples are available. Standard MOQ is 300 units, but smaller trial quantities can be discussed for first cooperation.
Q5. How do I place an order?
Please contact us with project details. After confirmation, we issue a proforma invoice. Payment supports TT, PayPal, Visa. Terms include EXW, FOB, DAP and others.
Q6. How will the goods be shipped?
Courier door-to-door is recommended, around 7 days. Air freight takes about 7 days. Sea freight normally requires over one month.
For 2-pipe or 4-pipe fan coil projects, a Thermostat with Sensor should be selected by pipe system, valve control type, fan speed requirement, sensor position, and installation voltage. The HTW-31-F17-4E is suitable for projects that need 3-speed fan control, separate cooling and heating valve outputs, external sensing, and simple on/off HVAC control. For OEM buyers, contractors, and distributors, confirming system structure, wiring, power supply, sensor length, and order quantity before production will help reduce installation and commissioning risks.
Need Project Support?
If you are evaluating a fan coil project and need technical confirmation, feel free to contact us for application discussion and model selection support.
