Quick Summary
The HTW-31-DT12FWF thermostat wifi model is designed for fan coil unit control. It supports 3-speed fan control with relay outputs for stable operation. The device works with 2-pipe or 4-pipe on/off valve systems. It manages heating and cooling modes with simple control logic. Tuya app control enables remote access and basic system monitoring.
This page explains how the Tuya thermostat works in FCU systems. It covers control logic, function meaning, and technical parameter confirmation. Typical project questions and installation considerations are also included.
Key Functional Highlights
(This section introduces the main control functions and their engineering value in the specific HVAC system.)
(1) 4.3 inch colourful touch screen
The large touch screen makes daily operation simple and clear. We can quickly check temperature and system status on site. It helps reduce mistakes and makes setup and maintenance easier.
(2) 3-speed fan control
The thermostat wifi supports three fan speeds for different room needs. We can choose low, medium, or high based on comfort levels. This helps keep a good balance between airflow and energy use.
(3) 2/4 pipe (on/off)
The unit works with both 2-pipe and 4-pipe fan coil systems. The on/off valve control is simple and reliable for daily use. It fits most standard projects without complex settings. Please note that it is not suitable for projects requiring 0-10V valve control. For those applications, a different model with analogue output would be needed.
(4) Brightness adjustable
The screen brightness can be adjusted in standby mode. We can reduce light at night or in quiet rooms. This avoids disturbance and keeps the device comfortable for daily use. A softer display also helps extend the screen’s lifespan over time.
(5) WiFi (app control)
With Tuya WiFi, we can control the thermostat from a mobile app. Temperature and mode can be changed without being on site. This helps manage rooms more easily and saves time. It is especially useful when adjusting settings for guests or before arriving at the property.
If one is looking for RS485 Modbus communication for BMS instead of WiFi, one may consider this model instead (please click → HTW-31-DT12F).
Product Design and Display
(This section shows the thermostat appearance, screen interface, or installation dimensions of this specific model.)
Technical Specifications
(This section lists the key technical parameters relevant to this thermostat model.)
| Parameter | Value |
|---|---|
| Power Supply | 230Vac, 50/60Hz |
| Fan Relay Load | 5A |
| Built-in Sensor | NTC3950, 10K |
| Temperature Accuracy | ±0.5°C |
| Set-Point Range | 5~35°C |
| Warranty | 2 Year |
| Installation | 86x86mm or EU round box |
Wiring Diagram
(This section provides the wiring diagram for this thermostat in the relevant HVAC control system.)
Project Fit & Customization
(This section describes project suitability, system limitations, and available customization options.)
This thermostat wifi is not suitable for high-current electric heating systems. It is also not designed for modulating valve control applications. Projects requiring BACnet or advanced BMS integration may need other models.
Despite these limitations mentioned above, function customization can be discussed. WiFi or Tuya control can be adjusted for specific project requirements. Communication protocols or sensor logic can be modified after technical confirmation.
OEM customisation is also supported for project branding needs. Logo printing, housing colour, and label details can be adjusted. Packaging and interface layout can be aligned with project standards.
Certificates and Compliance
(This thermostat complies with European market requirements and is supported by certifications such as CE, RoHS, LVD test reports, EMC test reports, etc)
Exhibition Moments
(Our team regularly participates in international HVAC exhibitions such as Febrava in Brazil, The Big 5 in Dubai, and ISK-SODEX in Turkey, etc.)
Frequently Asked Questions
Q1: Can this thermostat wifi work with most FCU systems?
Yes, it is suitable for standard fan coil units with on/off valve control. It supports both 2-pipe and 4-pipe configurations. Always confirm wiring before installation.
Q2: Does it support external temperature sensors?
This model mainly uses a built-in sensor for room temperature control. External sensor options may require customised versions. Please confirm before project deployment.
Q3: How does Tuya WiFi control work in projects?
The thermostat connects to a local WiFi network for app access. We can adjust settings remotely through the Tuya platform. It helps basic monitoring and user-level control.
Q4: Can it be integrated into a BMS system?
This model focuses on standalone and WiFi control. It does not include Modbus or BACnet communication by default. For BMS projects, other models are recommended.
Q5: What is the MOQ and can I get samples?
We support sample orders for testing and evaluation. The usual MOQ is 300 units. Smaller trial orders like 100 units can be discussed.
Q6: How to place an order and arrange shipment?
Contact us to confirm specifications and project details first. We will provide a PI for confirmation. Payment supports TT, PayPal, and Visa, with EXW, FOB, or DAP terms.
Q7: How long does it take to prepare the products?
Standard samples can be shipped within 7 days. Custom models usually need 3 to 5 weeks. Bulk orders around 300 units take about one month.
Q8: How will the products be shipped?
Courier delivery like FedEx or DHL usually takes about 7 days. Air shipment also takes around one week. Sea shipment takes about one month or longer.
Need Help Choosing the Right Model?
If you are unsure which thermostat wifi fits your project, feel free to contact us. We can review your system and suggest suitable options.
Related Thermostat Models
For more details, please click here directly: Wi-Fi Thermostats | Modbus Thermostats | BACnet Thermostats
Final Note
HVAC projects require stable temperature control and simple system operation. This thermostat wifi manages fan coil units with basic valve and fan control. It supports Tuya remote access and improves daily operation efficiency and facility management.
