Quick Summary
The HTW-EB-FC-4N Smart Modbus thermostat is designed for 4-pipe fan coil units in both heating and cooling modes. It controls a two-wired motorized valve and a 3-speed fan, with Modbus communication for system integration. The device operates on 95–240Vac, 50/60Hz, ensuring precise temperature management with ±0.5°C accuracy.
This page provides a clear overview of the thermostat’s functionality, system control logic, technical specifications, installation guidance, and project customization options. It also addresses common questions about operation, deployment, and sample availability.
Key Functional Highlights
(1) Precise Temperature Control
The smart thermostat accurately maintains setpoints for heating and cooling, which is critical for consistent comfort and energy efficiency in fan coil projects.
(2) Modbus Communication Support
Enables integration with building management systems, allowing centralized monitoring and control, which simplifies deployment and reduces maintenance complexity.
(3) Fan and Valve Coordination
Controls both the fan and two-wired motorized valves simultaneously, ensuring smooth operation of 4-pipe systems without risk of overheating or inefficient cooling.
(4) Flexible Installation Options
Supports standard EU or electric boxes and offers black and white color variants, making installation straightforward while maintaining project aesthetic requirements.
Details
Specifications
| Power Supply | 95~240Vac |
| Frequency | 50/60Hz |
| Temperature Accuracy | ±0.5°C / ±1°F |
| Current Load | Fan Relay 5A (3A inductive), Valve Relay 3A (1A inductive) |
| Setpoint Range | 5~35°C |
| Storage Temperature | -5~45°C |
| Display Range | 5~99°C |
| Protection Class | IP20 |
Display
Wiring
Project Fit & Customization
The HTW-EB-FC-4N Smart Modbus thermostat is not suitable for integration with standalone HVAC systems that lack Modbus or BMS interfaces. It is optimized for indoor fan coil units with 4-pipe heating and cooling configurations and may not perform correctly in systems with incompatible valve types or non-standard wiring.
Despite these limits, we offer ODM customization for projects requiring specific control logic or interface modifications. Custom firmware, software integration, and UI adjustments can be discussed to meet project requirements without compromising operational stability.
OEM support is also available, including logo printing, color variants, and label customization. These options allow integration into branded projects while maintaining the engineering integrity of the thermostat.
Frequently Asked Questions
1. What types of fan coil systems are supported?
This smart Modbus thermostat works with 4-pipe systems and two-wired motorized valves, controlling both fan and valve precisely. For another model(HTW-EB-FC-2N you can click this link to read more details) which is designed for 2 pipe systems.
2. Can it communicate with a BMS?
Yes, Modbus support allows integration with most building management systems for centralized control.
3. What is the installation environment?
This smart Modbus thermostat is designed for indoor installation using standard EU or electric boxes. Ensure proper voltage and wiring compatibility.
4. What is the minimum order quantity and sample policy?
For this smart Modbus thermostat, samples are available, typically MOQ is 300 units, but smaller quantities can be negotiated for testing.
5. How can I place an order?
Contact us with project details; we provide a proforma invoice. Payments via TT, PayPal, Visa; terms EXW, FOB, DAP, etc.
6. What shipping methods are available?
Typically, door-to-door express (~7 days), air freight (~7 days), or sea shipping (~30+ days) depending on project needs.
Smart Modbus thermostat projects are best discussed in advance. Please contact us for system integration support, application guidance, and project-specific advice. We sincerely look forward to having a deeply communication with you.
