Quick Summary
HTW-WF01-FC-2KN is a Modbus Thermostat for 2-pipe fan coil unit systems in commercial, residential, and hospitality buildings. It controls a 3-speed fan and two wired heating/cooling valves based on room temperature.
The thermostat supports programmable scheduling, keycard energy-saving input, and RS485 Modbus communication. It is powered by 110VAC or 220VAC and designed for indoor wall-mounted installation.
This page explains how the thermostat regulates temperature, coordinates fan and valve outputs, integrates with Modbus systems, and supports OEM/ODM customization for engineering evaluation.
Key Functional Highlights
- 2-Pipe Seasonal Control Structure
These Modbus Thermostats are configured for 2-pipe systems where heating and cooling share the same water circuit depending on seasonal changeover. The thermostat avoids overlapping heating and cooling commands by following defined mode logic, ensuring stable operation within the system’s hydraulic structure.(Need Modbus only, click here) - Separated Fan and Valve Relay Outputs
Fan relay output supports up to 5A (3A inductive), and valve relay output supports up to 3A (1A inductive). Electrical separation between airflow and water flow control simplifies installation and reduces troubleshooting time during commissioning or maintenance. - Programmable Weekly Scheduling
Programmable Modbus Thermostats allow scheduled temperature control aligned with occupancy patterns. This is relevant for offices, hotels, and serviced apartments where temperature setback during unoccupied periods supports operational efficiency without affecting daytime comfort. - Keycard Energy Input Logic
The integrated keycard terminal allows occupancy-based control. When the card is removed, the thermostat can shift to predefined energy-saving parameters. This supports energy coordination in hospitality projects without altering the base FCU wiring structure. - Modbus Communication for Central Visibility
As communication-enabled Modbus Thermostats, supports RS485 Modbus protocol. Room data and control parameters can be accessed through a BMS platform, allowing centralized supervision, grouped adjustments, and consistent parameter management across multiple zones.
Details
Specifications
| Item | Specification |
|---|---|
| Power Supply | 110(+/-10%)VAC or 220(+10%,-15%)VAC |
| Frequency | 50/60Hz |
| Control Type | 2-pipe fan coil system |
| Accuracy | ±1°C at 21°C |
| Fan Relay Load | 5A (3A inductive) |
| Valve Relay Load | 3A (1A inductive) |
| Setpoint Range | 5–35°C |
| Installation | 86×86 mm box or US 2×4 in box |
Display
Wiring
Project Fit & Customization
HTW-WF01-FC-2KN Modbus Thermostats are suitable for 2-pipe fan coil applications only. They are not appropriate for 4-pipe systems requiring independent heating and cooling valve outputs. Installations requiring higher protection levels than IP20, outdoor placement, or non-communication standalone thermostats without Modbus should consider alternative configurations.
Customization options include OEM logo printing, housing color adaptation, packaging adjustment, and Modbus parameter alignment. ODM function adjustments can be discussed according to project scale and technical feasibility. All modifications require engineering confirmation before production.
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 this thermostat control a 4-pipe FCU system?
No. These Modbus Thermostats are designed for 2-pipe systems. 4-pipe systems require separate heating and cooling valve outputs.
Q2: Does it support building management integration?
Yes. The device supports RS485 Modbus protocol, enabling centralized monitoring and control through BMS platforms.
Q3: What is the MOQ and are samples available?
Samples are supported for evaluation. Standard MOQ is 300 units, and smaller trial quantities can be discussed.
Q4: Is keycard connection mandatory for operation?
No. The thermostat operates normally without connecting the keycard terminal. The input is optional.
Need Support
If you are selecting a model or planning a project, please contact us. We can help choose the right thermostat.
Related Thermostat Models
More product details, please click directly:
For 2-pipe FCU projects, Modbus Thermostats should be selected by pipe system, fan relay load, valve output, Modbus communication needs, and optional keycard energy-saving requirements. The HTW-WF01-FC-2KN is suitable for projects that need 3-speed fan control, shared heating/cooling water circuit logic, programmable scheduling, RS485 Modbus integration, and OEM-ready configuration. For OEM buyers, contractors, and system integrators, confirming wiring, power supply, communication settings, BMS requirements, and project quantity before ordering will help reduce commissioning risks and improve long-term HVAC control reliability.
If you are planning a 2-pipe FCU project, feel free to contact us to discuss system integration, wiring structure, or OEM/ODM customization options. We are ready to support your engineering evaluation and project deployment.
