Quick Summary
HTW-WF11-FC-2N is a Modbus Thermostat for 2-pipe fan coil units. It controls a 3-speed fan and an on/off valve. It works in both cooling and heating systems. Modbus communication allows group control. Time display and set-point limitation help manage temperature in FCU projects.
This page explains how the FCU Thermostat works in a fan coil system. It shows the Modbus control logic, key specifications, and typical installation points for project use.
Key Functional Highlights
(1) Stable Fan and Valve Control
This FCU Thermostat controls a 3-speed fan and a 2-pipe on/off valve. The logic keeps airflow and water flow balanced. It helps reduce temperature swings in daily operation.
(2) Modbus Group Control
As a Modbus Thermostat, it supports central monitoring and group control. Multiple units can be managed together. This improves control in hotels, flats, and office buildings.
(3) Set-Point Limitation
The set-point range can be limited. This prevents extreme temperature settings. It helps control energy use and protects the HVAC system from heavy load.
(4) Time Display
The built-in time display supports daily operation and scheduling. It improves clarity during use and helps coordinate temperature control in managed FCU projects.
Display
Specifications
| Parameter | Value |
|---|---|
| Power Supply | 95~240Vac, 50/60Hz |
| Current Load | Fan Relay 5A; Valve Relay 5A |
| Built-in Sensor | NTC3950, 10K |
| Temperature Accuracy | ±0.5°C |
| Set-Point Range | 5~35°C |
| Protection Class | IP20 |
| Warranty | 2 Year |
| Installation Box | EU round box or Standard 86x86mm Box |
Wiring
Guide
| Fan coil series | xx stands for |
|---|---|
| EC | EC fan |
| 2/4 | 2 for 2-pipe on/off; 4 for 4-pipe on/off system |
| M | Modulating valve control |
| W | Wi-Fi |
| N/B | N for Modbus; B for BACnet |
| K/E | K for Keycard; E for External sensor |
| 24 | Powered by 24V, or with 24V output for 0-10V valve |
| Example HTW-WF11-FC-xx: if xx = 2EN, it stands for a 3-speed fan, 2-pipe system with on/off valve control, external sensor function, and Modbus communication.
Most sub-models are ready-made. Kindly contact us to confirm availability. |
|
Project Fit & Customization
HTW-WF11-FC-2N is made for standard 2-pipe fan coil systems. It supports 3-speed fan and on/off valve control. It is not suitable for 4-pipe systems. It does not support advanced BMS protocols beyond Modbus RTU. Projects needing 0-10V modulating-only valves or complex central logic should use another model.
Despite these limits mentioned above, ODM function customisation can be discussed. Communication settings and control logic can be adjusted based on project needs. Feasibility depends on wiring and system structure. Technical review is required before confirmation.
OEM customisation is also available. Logo printing, colour customisation, label change, and packaging adjustment can be arranged for bulk orders.
Frequently Asked Questions
1- Is this Modbus Thermostat suitable for 4-pipe fan coil systems?
No, it is designed for 2-pipe on/off systems. 4-pipe applications require a different model with separate valve outputs.
2- Can multiple units be centrally controlled?
Yes. Through Modbus communication, this FCU Thermostat supports group control and central monitoring in building projects.
3- What installation conditions are required?
It fits EU round boxes or standard 86x86mm wall boxes. Indoor use only. Power supply must be 95–240Vac.
4- What is the minimum order quantity and sample policy?
Samples are available. Standard MOQ is 300 units. Smaller pilot quantities can be discussed based on project stage.
5- How can I place an order?
Please contact us. After confirming details, we issue a proforma invoice. TT, Paypal, Visa supported. Terms include EXW, FOB, DAP.
6- How is shipping arranged?
Courier delivery takes about 7 days. Air freight also about 7 days. Sea freight takes over one month, depending on destination.
If you are selecting a Modbus Thermostat or FCU Thermostat for a project, please contact us to confirm system compatibility and application details.
