Honeywell Home 22mm Motorised 3 Port Mid-Position Valve - V4073A1039/U Y-Plan Diverter Valve

The Honeywell Home V4073A1039/U is a 22 mm 3 port mid-position motorised diverter valve designed for conventional fully pumped central heating systems with both radiator and hot water cylinder circuits. This Sundial Y-plan valve provides precise flow control between heating, hot water, and simultaneous operation modes using room and cylinder thermostats.

Key Features

• 3-position operation: Port A (heating), Port B (hot water), Port AB (mid-position for both).
• Spring return action defaults to hot water priority on power failure.
• Powerhead replaceable without system drain-down for easy maintenance.
• Manual lever for system filling and draining in MAN OPEN position.
• Electrical output to control boiler and pump operation.
• Quiet operation with minimal 6 W power consumption.

Why Choose Honeywell Home V4073A1039/U?

Industry standard for Y-plan fully pumped systems, this valve offers proven reliability with serviceable design and comprehensive electrical interlock for safe boiler/pump operation.

Perfect for small to medium domestic installations requiring independent temperature control of heating and hot water circuits.

Suitable For

• Sundial Y-plan systems with room and cylinder thermostats.
• Fully pumped conventional heating installations up to 90,000 BTU (26 kW).
• Small to medium homes with 22 mm pipework.

Technical Specifications

• Brand: Honeywell Home by Resideo
• Model: V4073A 3 Port Mid-Position Valve
• MPN: V4073A1039/U
• GTIN: 5023220400356
• Connections: 22 mm compression
• Valve Type: 3 port mid-position diverter
• Body Material: Brass
• Supply Voltage: 230 V AC, 50 Hz
• Power Consumption: 6 W
• Switch Rating: 2.2 A (230 V AC resistive/inductive)
• Timing: Motorised movement ~14 seconds
• Fluid Temperature Range: 5-88 °C
• Max Differential Pressure: 0.6 bar
• Max Static Pressure: 8.6 bar
• Cable: 1 m heat-resistant flying lead (8-core)
• Weight: 1.3 kg
• Warranty: 1 year

Installation & Wiring

Designed for horizontal or vertical pipe mounting with powerhead positioned above horizontal pipe centreline. Compatible with Honeywell Sundial Plan Wiring Centre or 10-way junction box. 8-core cable provides dedicated connections for grey (A), orange (B), white (AB) control wires plus power and switch outputs.