Honeywell V4073A1039/U 22 mm Mid Position Valve

Product Information

Honeywell 2-port motorised zone valves (V4043H) are electrically quite simple. The powerhead contains the motor, which is used to drive the valve open, and an auxiliary switch or end switch. Honeywell 22mm zone valve operation (V4043H1056) Honeywell say that the manual lever located on the end of the powerhead is not a position indicator and should be used used for filling the system and for draining down only. When all electrical power to the heating controls is switched off, the spring pulls the ball across to close port A, leaving port B open. This is the relaxed state or de-energised state of the valve. It is also sometimes called the Normal state. 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.

On older style valves pre-1985, which do not have the replaceable head feature, the adaptor plate assembly can be used to upgrade the valves, to allow the replaceable powerhead to be used.” Only when both white and grey wires are energised (and the valve goes to the Heating Only position) can the orange wire get its 230V supply via the valve itself. (Remember, the orange wire can also get 230V from the cylinder stat if it is calling and a hot water program is on.) My first thought was that the boiler wasn't firing up because the micro switch(es) to do so were faulty. These valves have compression pipe connections, though Honeywell make motorised valves with threaded connections too. How motorised valves are used Nearly all Honeywell valves have a powerhead (also called an actuator) which can be separated from the valve body. The valve body is the brass casting which is bolted into the pipework.

Delivery Policy

If I move the lever to manual open position, nothing happens, neither CH or HW pipes from valve become hot and boiler does not fire. Does this suggest that the valve mechanism is not opening? We are currently using Royal Mail Parcelforce and DPD as our delivery providers, all small items will be delivered by Royal Mail, these can take up to three working days to reach you.

As I understand it there are some micro switches in the valve, if they are not operating correctly, does the boiler think that the valve has not opened and therefore does not fire up? V4043H1056 is a 2 port, 22mm compression, 5-wire, normally-closed zone valve with an auxiliary end switch V4043C1156 is a 2 port, ½” BSP Female threaded, 3-wire, normally-closed zone valve but has no end switchI have yet to establish if the valve head ( the bit with the motor ) can be removed without having to drain the system. Apparently it is dependent on having a later model of the Honeywell valve. Two screws hold on the motor to the valve in the later models, and two others hold the plate to the valve body. A programmer and cylinder thermostat (stat) are used to control the times when the hot water is heated and to control the maximum temperature of the stored hot water. With modern boilers, the boiler sends a Live feed to the circulating pump which then pumps heated boiler water through the valve. It will go to the radiators or to the cylinder coil, depending on which valve was opened. With older boilers, the Live from the auxiliary circuit end switch goes directly to the pump at the same time as it goes to the boiler Switched Live. The auxiliary circuit allows several 2-port motorised valves to be used to control separate zones without interacting electrically. Otherwise, if several zone valves were used without auxiliary circuits, and all were connected to the same pump so that the Live wire that opened each valve also fed the pump Live, there would be problems. The manual lever of the valve offers no resistance with the power off and it does not return to the auto position when released, as it should. I have played with one of these valves in a shop and the resistance to movement is much greater and the valve does return to the auto position.

Honeywell V4073A1039 22mm 3-port mid-position diverter valve. These are 5-wire valves. When used with other Honeywell controls the setup is know as Y Plan The blue wire is the Neutral, N. The green/yellow wire is the Earth wire, E. The white wire is connected to the wire from the room thermostat which calls for heating (radiators or underfloor). The grey wire is used to drive the valve to the Water Off position, in which only the heating port A is open; it closes port B. The orange wire provides a Switched Live (Switched Line) feed to run the boiler and pump. Sometimes if I bang the valve with my hand sometimes CH and HW start to work after some gurgling noisesThe Honeywell motorised valve faults detailed above are likely to apply to most domestic Honeywell valves. If you know how to work safely with mains voltage electricity, the valve motor can be tested with a multimeter. With the mains electrical supply turned off and isolated, the resistance across the two motor wires (either both blue or both orange) can be tested. To test correctly, at least one of the two motor wires must be disconnected from the heating wiring circuit. The Y Plan and S Plan names are more commonly used when other Honeywell controls are also used (programmer, room thermostat, cylinder thermostat and wiring centre). The pump is going all the time, trying to do something and the pipework is throbbing! But is it pumping water? The wires to disconnect are the two wires which run from the motor. On earlier motorised valves, these were both joined to other wires using metal crimps encased in plastic. On more recent valves, one wire is joined with a crimp and the other is wired directly to the electrical components of the valve.

Is the manual lever directly connected to the spindle? If so if I move it to open position then water must flow and therefore the boiler should fire up as hot water leaves it. The pump has failed, and is pretending to be working ( but then why does banging the valve cause everything to work sometimes ? )

Honeywell 22mm Midposition Diverter Valve V4073A Features:

In larger properties, 28mm valves may be used (the 5-wire 3-port V4073A1088 and the 6-wire 2-port V4043H1106). The 28mm V4043H1106 2-port zone valve has a6 th wire, coloured white. This white wire might not be used. In that case it should be made safe electrically. Left to its own devices with pump on and CH and HW on, nothing seems to be happening in terms of pipes neat the valve getting hot But then I go confused because I was wondering why it was opening the valve in the first place when the controller hasn't asked it to do so.