Elegant 2-pipe 4-pipe Room Thermostat with Modbus Keycard Humidity Display

Key Functional Highlights

(This section explains the core control functions and their practical value.)

(01) 3-speed fan control
Three selectable fan speeds allow flexible airflow adjustment in fan coil units. Commissioning engineers can match airflow to room size and noise requirements. This helps maintain stable comfort while reducing unnecessary energy use during daily operation.

If one is looking for a thermostat with EC fan control, one may refer to the Model (HTW-FC08-ECNW), which supports Wi-Fi, Modbus, keycard, external sensor, and more.

(02) 2/4-pipe valve control
The room thermostat supports both 2-pipe and 4-pipe fan coil systems. On/off valve outputs regulate chilled or hot water flow. Using the same controller across different system layouts simplifies spare parts management and installation planning.

(03) Keycard energy management
A keycard input supports common hotel room energy management logic. When the card is removed, the thermostat can limit operation automatically. This prevents unnecessary fan and valve running when the room is vacant.

(04) RS485 Modbus communication
The room thermostat supports RS485 Modbus communication for building control integration. A central system can read operating data and room temperature. Facility teams can supervise many rooms from one control interface.

(05) Built-in humidity sensing
An integrated humidity sensor provides additional environmental monitoring. Facility teams can observe humidity trends together with room temperature. This helps identify abnormal conditions and improves comfort control in air-conditioned spaces.

Display

(This section shows the product’s dimensions and the interface layout.)

Specifications

(This section lists the key parameters for reference and project confirmation.)

Parameter	Value
Power Supply	95~240Vac, 50/60Hz
Fan Relay Load	5A
Valve Relay Load	5A
Built-in Sensor	NTC3950, 10K
Temperature Accuracy	±0.5°C or ±1℉
Set-Point Range	5~35°C
Warranty	2 Year
Installation	EU round box or 86×86mm box

Wiring

(This section provides the wiring reference diagram for correct installation.)

Project Fit & Customization

(This section explains where the product can be used, its limits, and OEM/ODM options.)

This room thermostat is not suitable for systems that require modulating valve control. It also does not support Wi-Fi or mobile app operation. Projects that require BACnet communication or advanced automation logic may need another controller model.

Despite these limitations mentioned above, functional ODM options can be discussed for suitable projects. Communication protocols, additional sensors, or wireless connectivity may be considered. Such changes depend on project quantity and technical feasibility.

OEM customisation is also available for brand integration. Logo printing, product labels, and packaging design can be arranged. Housing colour adjustments or private model naming may also be supported.

Certifications

(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 room thermostat work with both 2-pipe and 4-pipe FCU systems?

Yes. The thermostat supports both configurations using on/off valve control. Installers can select the correct system mode during setup. This allows the same controller model to work across different project layouts.

Q2. How does the Modbus function help in building management systems?

The thermostat communicates through the RS485 Modbus protocol. A building management system can read room temperature and operating status. Facility operators can monitor and adjust many rooms from a central interface.

Q3. Can the thermostat use internal or external temperature sensors?

The thermostat supports several sensing options depending on configuration. It may use only the built-in sensor, only an external sensor, or both sensors together. Please refer to the manual or contact us for detailed configuration logic.

Q4. Is this thermostat suitable for hotel guest room projects?

Yes. The keycard input allows integration with common hotel energy systems. When the card is removed, the thermostat can reduce operation automatically. This helps avoid energy waste when the room is empty.

Q5. What is the minimum order quantity and can samples be provided?

Yes, samples are available for evaluation before bulk orders. The usual minimum order quantity is around 300 units. Smaller trial quantities such as 100 units may also be discussed.

Q6. How can we place an order and arrange payment?

Please contact us first to confirm the model and project details. We will then issue a proforma invoice. Payment methods include TT, PayPal, and Visa. Shipping terms may be EXW, FOB, or DAP.

Q7. How long does it take to prepare the products?

Standard samples usually ship within seven days. Custom orders may require programme adjustment and testing. For example, an order of around 300 units normally requires about one month.

Q8. What shipping methods are normally used?

Express courier services such as DHL, FedEx, or UPS usually take about seven days. Air freight has a similar transit time. Sea shipping normally takes around one month, depending on the destination.

Need Support?

If you are selecting a room thermostat for a fan coil project, please contact us. Our engineers can help review system compatibility and confirm the correct model.