WFS-1001-H – Honeywell Water Flow Switch Sensor for HVAC Systems

In HVAC, chiller, and industrial piping systems, monitoring water flow is essential to ensure operational stability, prevent pump dry-run, and optimize system performance. For efficient equipment protection, the Honeywell WFS-1001-H paddle-type flow switch is a trusted choice, widely adopted in modern engineering projects.

1. Overview of the Honeywell WFS-1001-H Flow Switch Sensor

Honeywell, a global leader from the USA, is well-known for its control systems, sensors, and valves used in HVAC and industrial automation.

The WFS-1001-H model belongs to Honeywell’s Water Flow Switch series, designed to detect water flow within pipelines and provide ON/OFF control signals to activate pumps, fans, or valves—enhancing both safety and system performance.

Key Features:

• Precisely detects water flow or stoppage.
• Durable mechanical structure—suitable for chilled, hot, or recirculated water.
• SPDT switch output—easy to integrate into HVAC control systems or alarms.
• Operates under high pressure and temperature—ideal for industrial environments.
• Simple installation and calibration—no complex setup required.

2. Working Principle of the WFS-1001-H

The WFS-1001-H operates on the principle of a mechanical paddle flow switch:

• When water flows through the pipe, the internal paddle is pushed, closing the circuit (ON).
• When the flow stops, the paddle returns to its default position, opening the circuit (OFF).

This mechanism enables precise detection of water flow status, helping protect pumps, compressors, and valves in both HVAC and industrial systems.

3. Real-World Applications of Honeywell WFS-1001-H

The WFS-1001-H flow sensor is widely used in various sectors, especially in:

• Industrial HVAC systems: Monitor chilled water flow to protect pumps and chillers.
• Commercial buildings & data centers: Control water flow to AHUs or FCUs.
• Fire protection & automatic water supply systems: Trigger alarms or valves upon detecting flow.
• Water treatment plants: Monitor input and output flow for process control.

Thanks to its high reliability and ability to operate in harsh conditions, the WFS-1001-H is a dependable choice for water systems with varying pressure and temperature.

4. Key Advantages of Honeywell WFS-1001-H

5. Role of Flow Sensors in HVAC Systems

In HVAC systems—especially chillers or AHUs—monitoring water flow is crucial to:

• Ensure sufficient water circulation across heat exchangers
• Prevent pump damage due to dry running or blockages
• Enable BMS to monitor system status in real-time
• Optimize energy use by adjusting water flow to match cooling loads

By integrating the Honeywell WFS-1001-H, HVAC systems operate more safely and efficiently, minimizing risks and maintenance costs.

6. Why Choose WFS-1001-H from DLK Vietnam

DLK Vietnam is an official distributor of Honeywell in Vietnam, specializing in valves, actuators, sensors, and HVAC/BMS controllers.

Customer benefits when purchasing from DLK:

• Genuine Honeywell product with full CO/CQ certification
• Free technical consultation tailored to specific applications
• On-site support for installation & setup
• Reliable warranty and responsive after-sales service

7. Conclusion

The Honeywell WFS-1001-H paddle-type flow switch is a trusted solution for water flow monitoring in HVAC, chiller, and industrial systems.

With a robust design, simple yet effective operation, and flexible integration capabilities, the WFS-1001-H helps protect your equipment, save energy, and optimize system performance.