Complete FCU Solution with Honeywell TFM428, V4043 & WFS-1001-H

To optimize building operations and ensure comfort, integrating a comprehensive Fan Coil Unit (FCU) control system is essential. DLK provides a total solution combining three core Honeywell devices: the TFM428 thermostat, the V4043 zone valve, and the WFS-1001-H flow switch. This combination delivers high system synchronization, stable operation, and effective energy savings.

Complete FCU control system Honeywell TFM428, V4043, WFS-1001-H - Genuine consultation by DLK

1. Components of the Complete FCU Control Solution

This solution includes three core devices, each performing a vital function to optimize the FCU system:

• Honeywell TFM428 (Thermostat): Acting as the system's "brain," the TFM428 senses room temperature and controls the fan (3-speed) and the zone valve (on/off) to maintain the desired temperature.
• Honeywell V4043 (Zone Valve): Serves to close or open the water flow (hot or chilled) supplied to the FCU based on the control signal from the thermostat, regulating the coil's capacity.
• Honeywell WFS-1001-H (Flow Switch): A protective device, the WFS-1001-H monitors the presence of water flow in the pipeline supplying the FCU. Signals from this switch ensure that the FCU (fan) only operates when there is sufficient water flow, protecting the coil and the entire system.

2. Technical Specifications of the Components

3. Installation and Operation Guide

1. Install TFM428: Mount the thermostat in a visible location on the wall, approximately 1.5m above the floor, away from direct sunlight or cold drafts. Install the flush box and connect power, fan, and valve wires according to the diagram.
2. Install V4043: Mount the valve on the supply or return pipe of the FCU, ensuring flow direction matches the arrow on the valve body. Secure the valve and connect the power and control signal wires from the thermostat to the valve actuator.
3. Install WFS-1001-H: Mount the flow switch on horizontal or vertical piping, ensuring flow moves from High to Low. Adjust the paddle to fit the pipe size and the flow rate threshold to be monitored.
4. Operation: Power the system. Use the TFM428 thermostat to set the desired room temperature. Check V4043 valve actuation and fan speed control. Verify WFS-1001-H ensures the system only operates with water flow.

4. Common Applications and Benefits

• Control and protection of Fan Coil Unit (FCU) systems in hotels, office buildings, hospitals, and schools.
• Effective energy savings through flexible zone valve control and intelligent flow monitoring.
• Increased FCU system lifespan due to the protective function of the WFS-1001-H flow switch.
• High synchronization and stable operation by combining devices from the trusted Honeywell brand.

5. Why Choose DLK for Complete FCU Solutions?

• ✅ Provision of complete genuine Honeywell device sets, directly imported with full CO/CQ documentation.
• ✅ Expert technical consultation to select the optimal TFM428, V4043, and WFS-1001-H models for project requirements.
• ✅ Complete technical catalogs provided for project documentation.
• ✅ Clear warranty policy and rapid after-sales technical support.