Honeywell V4073A1039/U 22 mm Mid Position Valve

Product Information

Left to its own devices with pump on and CH and HW on, nothing seems to be happening in terms of pipes near the valve getting hot Been researching the subject a bit online and found out that when the central heating is switched on by the controller, it powers the motor which in turn opens the valve plus also triggers a couple of microswitches which instruct the boiler to ignite. This can be difficult to feel for at first. It is most obvious when the valve has been in the Heating Only position and reverts to the mid-position. V4044C motorised valves are 3 port diverter valves. They send flow to either the hot water port or the heating port but not both, except briefly during switchover. They are 3 wire valves.

The valve mechanism is physically not allowing water to flow out of either outlet ( but surely this is impossible, one of the outlets HAS to be open as all the valve can do is to close one outlet ?) These valves have compression pipe connections, though Honeywell make motorised valves with threaded connections too. How motorised valves are used The Honeywell motorised valve faults detailed above are likely to apply to most domestic Honeywell valves. It will make it easier when re-fitting it (just remember which end the flex was connected or take a picture on your phone). The powerhead can only fit one way round onto the valve body but if space is tight that might not be obvious.This can cause the valve spindle to seize. It often becomes stiff to turn at first and the valve may give intermittent problems. Eventually, the spindle may become so stiff that the valve motor cannot turn it at all. The powerhead or actuator is the electrical section. It’s comprised of a motor and some electronic components and usually has one or more microswitches. Sometimes turning off the HW allows the CH to work, after some minor gurgling noises from the system lt;p>Honeywell 22mm Mid-Position Valve is designed to be used in conjunction with a room thermostat and cylinder thermostat to provide full temperature control of a conventional, fully pumped central heating installation. The valve has been designed to control the flow of water in domestic central heating systems, where both radiator and hot water cylinder circuits are pumped. The Honeywell V4073A Mid Position Valve is typically suited for small to medium sized installations.</p> The Honeywell V4073A 3-port valve has five wires. These are blue, green/yellow, white, grey and orange. Note that the grey and orange wires are used differently from the grey and orange wires of the 2-port valve!

Secondly, as the solution is to replace part or all of the valve head, is this model one that doesn't require draining of the water. How can I tell? Valve is in a bit of an awkward position in the airing cupboard so would rather not take the chance. The V4073A Mid-position Diverter Valve should be used in conjunction with a room thermostat and cylinder thermostat to provide full temperature control of a conventional, fully pumped central heating installation. When used in this way, the control system is known as Sundial Y Plan and the components can be connected together using the Sundial Plan Wiring Centre which has dedicated terminations and there is no need for a wiring diagram. Honeywell 22mm Midposition Diverter Valve V4073A Features:

Product Specification

When using a 3-port valve, the control system may be known as a Sundial Y Plan system or a Honeywell Y Plan system. In medium sized or larger properties, using a combi boiler, there may be an additional zone valve external to the boiler which allows the heating to be split into two zones. On modern Honeywell valves, if the powerhead fails it can be removed from the valve body without draining down. However,be warned!With very old Honeywell motorised valves the powerhead could not be removed without draining the water first. Drive spindle of a Honeywell motorised valve. It is accessed by removing the valve powerhead. Be warned, with Honeywell motorised valves made pre-1985 you have to drain down first to remove the powerhead! Think I had this before but switched itself off after some time, do currently waiting to see what happens. Also need to test with hot water on constant.