Honeywell V4073A1039/U 22mm Mid-Position Valve – Gold/Silver
The Honeywell V4073A1039/U is a 22mm mid-position motorised valve designed for use in Y-plan central heating systems. It controls the flow of hot water between the heating circuit (radiators) and the hot water cylinder, allowing both to operate independently or simultaneously.
🔹 Key Features:
- Type: Mid-position (3-port) valve – allows independent or combined control of heating & hot water
- Pipe Size: 22mm compression fittings – suitable for most domestic systems
- Motorised Actuator: Spring-return action for reliable operation
- Manual Override: Allows for manual operation during servicing
- Voltage: 230V AC
- Wiring Compatibility: Standard 5-wire system for Y-plan installations
- Durable Construction: Brass body with gold/silver finish for longevity
- Replaceable Actuator Head: The actuator can be replaced without draining the system
🔹 Common Uses:
✔ Y-Plan central heating systems (1 boiler, 1 hot water cylinder, and radiators)
✔ Diverts water between central heating and hot water cylinder
✔ Allows simultaneous heating of radiators and hot water
✔ Replaces faulty 3-port valves in Honeywell-compatible systems
🔹 Installation & Wiring Notes:
- Turn off power to the heating system before starting installation
- Drain the system if replacing the valve body
- Remove the old valve and fit the new Honeywell V4073A1039/U
- Ensure proper wiring connection (standard Y-plan wiring)
- Test the system to ensure the valve moves correctly between heating and hot water modes
⚠ Important: If unsure, consult a Gas Safe registered engineer or qualified heating technician for installation.
🔹 Common Issues Indicating Replacement:
✔ Radiators heating up when only hot water is needed
✔ Hot water not working but heating is fine (or vice versa)
✔ Stuck in one position, preventing proper system operation
✔ Clicking or buzzing noise from the valve actuator
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