NEW HONEYWELL 2 PORT ZONE VALVE 272848/U (272848) V4043

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The Honeywell motorised valve faults detailed above are likely to apply to most domestic Honeywell valves. V4043C1156 is a 2 port, ½” BSP Female threaded, 3-wire, normally-closed zone valve but has no end switch 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.

WARNING! ALWAYS ISOLATE THE AC MAINS SUPPLY BEFORE REMOVING OR REFITTING THE ACTUATOR ASSEMBLY. THIS ACCESSORY MUST BE FITTED BY A COMPETENT PERSON, AND INSTALLATION MUST COMPLY WITH THE GUIDANCE PROVIDED IN THE CURRENT EDITIONS OF BS7671 (IEE WIRING REGULATIONS) AND PART ‘P’ OF THE BUILDING REGULATIONS. 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! 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.) I Have Replaced A Sunvic Sm 5203 With Honeywell V4043h Motorised Zone Valve Can Anyone Tell Me Which Wires

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When using a 3-port valve, the control system may be known as a Sundial Y Plan system or a Honeywell Y Plan system. The commonest fault with Honeywell motorised valves is motor failure. Honeywell valve motor fault? Testing a Synchron valve motor The V4043 series of 2 port Motorised Valves has a wide range of flow control applications in domestic and light commercial central heating systems. The V4043H normally closed models have end switches for electrical control of pump and/or boiler. The V4043B normally open model is particularly applicable to control of solid fuel systems, since it will always fail-safe in the event of a power failure. Typically, a small or medium sized property will have either one 3-port valve (which splits the central heating water flow between cylinder and radiators) or two 2-port valves (one governing flow to the cylinder and one governing flow to the radiators). When Heating is also called for, the white wire is energised and the valve will motor to, and stop in, a mid-position. Power for the boiler is still supplied directly from the cylinder thermostat. The orange valve wire may have a potential of 230V but this is coming from the cylinder stat (to which the orange wire is also connected) and not from the circuitry of the valve.

Replacement Honeywell SYNCHRON motors are available but are a bit more expensive. For a long time we’ve used the standard SYNCHRON motors as replacements, with very few problems. The V4043 series of 2 port Motorised Valves has a wide range of flow control applications in domestic and light commercial central heating systems. The V4043H normally closed models have end switches for electrical control of pump and/or boiler. 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 a powerhead is able to drive the valve only part way open but not far enough for the auxiliary circuit end switch to close. This valve will then not be able to tell the boiler to fire.

A normally-open valve is open when no power is being applied to it and needs electrical power to drive it closed. 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. With the powerhead cover removed you also have access to the screw which retains the motor. The motor can, if necessary, be removed without disconnecting the powerhead from the valve body.

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.V4043H1007 is a 2 port, ¾” BSP Female threaded, 5-wire, normally-closed zone valve with an auxiliary end switch 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. Honeywell V4073A1039 22mm 3-port mid-position motorised valve showing inlet port AB and outlet ports A and B. This valve can be open to either port A or port B, or to both ports at the same time Synchron valve motors can remain energised and hot for many hours a day, all through the winter. They may eventually fail. A failed Synchron valve motor will prevent a 2-port motorised valve from working. The valve won’t be driven open and the end switch will not be made (connected) so power will not be sent on to the boiler or pump. 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.