Modbus RTU Communication
EIA485 physical layer with Modbus RTU protocol for integration into building automation systems.
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Honeywell
Honeywell TF428WNM/U Thermostat Panel
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$111.31
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PRODUCT DOCUMENTATION
Product Information
Technical specifications, features, applications and purchasing information.
Technical Specifications
| Brand | Honeywell |
| Model Number | TF428WNM/U |
| Product Category | Thermostat Panel |
| Communication Protocol | Modbus RTU |
| Physical Layer | EIA485 |
| Baud Rate | 4800/9600 (default)/19200 |
| Power Supply | 220/230 VAC, 50/60 Hz |
| Power Consumption | <2 W |
| Control Output | On/Off |
| Temperature Control Accuracy | ±1°C at 21°C |
| Setpoint Range | 10 to 32°C |
| Protection Class | IP20 |
| Ambient Operating Limits | 0 to 49°C |
| Humidity Limits | 5 to 90% RH, non-condensing |
| Application | 2-pipe/4-pipe fan coil systems |
| Fan Control | 3-speed, manual or automatic |
Key Features
3-Speed Fan Control
Manual or automatic 3-speed fan control for fan coil unit applications.
2-Pipe/4-Pipe Fan Coil Applications
Designed for 2-pipe and 4-pipe fan coil systems with cooling/heating and manual/automatic changeover.
On/Off Valve Control
Provides on/off water valve control output for fan coil temperature regulation.
±1°C Temperature Accuracy
Temperature control accuracy of ±1°C at 21°C for stable room temperature maintenance.
IP20 Protection
IP20-rated enclosure suitable for indoor wall-mounted installation in building environments.
Applications
- Fan coil unit temperature control
- Building automation and HVAC systems
- 2-pipe cooling or heating fan coil systems
- 4-pipe cooling/heating fan coil systems
- Hotel room and office temperature management
- Commercial building climate control
- Modbus RTU network integration for HVAC control
Purchase Information
We support online purchase of the Honeywell TF428WNM/U Thermostat Panel. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is the Honeywell TF428WNM/U? It is a communicating fan coil thermostat designed for 3-speed fan and valve control in fan coil systems.
What communication protocol does it use? It uses Modbus RTU over an EIA485 physical layer.
What is the power supply? The power supply is 220/230 VAC, 50/60 Hz.
What is the power consumption? The power consumption is less than 2 W.
What is the temperature control accuracy? The temperature control accuracy is ±1°C at 21°C.
What is the setpoint range? The setpoint range is 10 to 32°C.
What is the protection class? The protection class is IP20.
What is the ambient operating temperature range? The ambient operating limit is 0 to 49°C.
What fan speeds does it support? It supports manual or automatic 3-speed fan control.
What types of fan coil systems is it intended for? It is intended for 2-pipe and 4-pipe fan coil systems.
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