Quick Summary
The HTW-WF01-FC-4ENS Room Thermostats are designed for 4-pipe fan coil units, controlling both fan speed and two wired heat and cool motorized valves. They support heating, cooling, and automatic operation, and can interface with external sensors and Modbus communication for centralized monitoring. Accuracy is ±1°C at 21°C, supporting setpoint ranges from 5–35°C, with fan relay loads up to 5A and valve relays up to 3A. The thermostats ensure stable temperature control even in multi-zone applications, helping reduce energy waste while maintaining comfort.
An overview of the system control logic, functional benefits, key technical specifications, wiring diagrams, and guidance for project deployment. Users can assess typical project scenarios, confirm installation requirements, and explore customization options when integrating these Room Thermostats into existing building control systems. It also highlights operational considerations for engineers managing multiple units or centralized BMS integration.
Key Functional Highlights
- Integrated 4-Pipe Control: Room thermostats manages both heating and cooling circuits in a 4-pipe system, ensuring the fan coil unit delivers precise temperature control. This reduces room temperature fluctuations and simplifies system configuration. The precise management also helps maintain occupant comfort in complex building layouts with multiple zones.
- Fan and Valve Coordination: It directly controls fan operation and two motorized valves. Coordinated control ensures efficient response to heating/cooling demands, minimizing energy consumption while maintaining comfort. This functionality reduces mechanical stress on system components and allows smoother start-stop cycles for extended equipment life.
- External Sensor Compatibility: Support for external temperature sensors enables accurate monitoring of remote zones or challenging layouts. This enhances system performance and ensures stable temperature regulation throughout the space. External sensors also allow engineers to fine-tune control logic for specific rooms or areas where temperature variance is critical.
- Modbus Communication Integration: Built-in Modbus communication allows connection to BMS or central controllers, providing status monitoring, control adjustments, and fault diagnostics. This improves maintainability and operational reliability for building engineers. Additionally, the communication interface enables centralized scheduling and easier integration with energy management software.(Need standalone, click here)
Details
Specifications
| Parameter | Value |
|---|---|
| Power Supply | 110(+/-10%)VAC or 220(+10%,-15%)VAC |
| Frequency | 50/60Hz |
| Accuracy | ±1°C at 21°C |
| Fan Relay Load | 5A (3A inductive) |
| Valve Relay Load | 3A (1A inductive) |
| Setpoint Range | 5–35°C |
| Display Range | 5–99°C |
| Installation | 86×86 mm junction box or US 2×4 in box |
| Protection Class | IP20 |
| Storage Temperature | -5–45°C |
Size
Wiring
Project Fit & Customization
This Room Thermostats model is suitable for fan coil systems with 4-pipe configurations. It is not recommended for standalone systems lacking valve or fan control, nor for projects requiring analog-only interfaces, as precise Modbus integration or external sensor support is needed for optimal performance. Engineers should consider system load and building zoning when deploying multiple units to avoid communication conflicts or uneven temperature distribution.
Customizations are available for OEM logo printing, color selection, and certain ODM function adjustments. All modifications require coordination to ensure compatibility with the HVAC system; unlimited customization is not guaranteed, but engineering discussions can define feasible adaptations. Additional project-specific options, such as preconfigured setpoints or factory calibration for particular environments, can also be considered to reduce on-site commissioning time.
Certifications 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 these thermostats be used with 2-pipe systems?
A1: No, the HTW-WF01-FC-4ENS is designed for 4-pipe fan coil systems to ensure proper heating and cooling control. Using them on 2-pipe systems may lead to improper valve operation or temperature instability.
Q2: Is Modbus integration supported?
A2: Yes, these Room Thermostats support Modbus communication for centralized monitoring and control. This allows connection to building management systems for scheduling, monitoring, and energy reporting.
Q3: What is the typical sample and minimum order quantity?
A3: Samples are available, with standard MOQ at 300 units. Smaller quantities can be discussed case by case, enabling pilot projects or testing before full deployment.
Q4: Can external sensors be connected?
A4: Yes, the thermostat can work with external temperature sensors to enhance accuracy in challenging installation layouts. External sensors help optimize performance in rooms with high sun exposure or variable occupancy.
Related Thermostat Models
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For 4-pipe fan coil projects, Room Thermostats should be selected by system structure, valve output, fan relay load, external sensor need, and Modbus integration requirements. The HTW-WF01-FC-4ENS is suitable for projects that need separate heating and cooling valve control, 3-speed fan operation, external sensing, and centralized BMS monitoring. For OEM buyers, contractors, and system integrators, confirming wiring, power supply, communication settings, sensor placement, and project quantity before ordering will help reduce commissioning risks and improve long-term system reliability.
