In larger properties, 28mm valves may be used (the 5-wire 3-port V4073A1088 and the 6-wire 2-port V4043H1106). If Hot Water is then satisfied (either by the programmer or cylinder stat), the grey wire is energised. The motor must then be wriggled back into place so that one of the motor flanges slides back below the angled metal tab on the powerhead. 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 Honeywell V4043 motorised two-port zone valve with a 22 mm compression connection is designed for a variety of flow control applications in domestic and light commercial central heating systems.

Valve 95C-10819 - V4043H Motorised Zone Valve

If the white wire is not used, the 28mm zone valve is wired in the same way as the 5-wire 22mm zone valve, and operates in the same way. Occasionally we come across a Honeywell motorised valve where the powerhead jams but the spindle (actuator shaft) is still free. You should be able to feel a bit of spring resistance, right at the far end (Man Open end) of the slot.If, when the programmer is attempting to open the valve, the lever continues to feel stiff, then the valve is most likely to be faulty as it is not opening. These screws are diagonally opposite each other and pass through the steel base plate of the powerhead (actuator) into the brass flanged top of the valve body. In this valve position, the lever is only slack in the slot for about a quarter of the slot travel (starting at the Auto end).

Lever on a Honeywell 2 port valve | DIYnot Forums Lever on a Honeywell 2 port valve | DIYnot Forums

So the only difference between the two valves is the orange wire on the downstairs is not going live.There is always an open pathway from port AB to port A or from port AB to port B or from port AB to both ports A and B at the same time. I'm assuming that you've got no hot water due to the overheat malfunction - in which case there's nothing to stop you hooking the valve open permanently if this resolves the banging (and simultaneously getting you some hot water) until we determine why the valve isn't opening.

Honeywell Home 22mm 2 Port Motorised Valve (V4043H1056/U) - CEF

If the motor is receiving 240v (on the brown and blue) it should rotate the spindle about 15 degrees and operate the microswitch.You set the valve into the manually open position by turning the power off, then pushing the lever towards the Man Open end of the slot. It is now relatively unusual for the white wire (6 th wire) of a Honeywell 2-port zone valve to be used. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. As Boilers and radiators are installed by third parties, they do have to install in compliance with regulations and manufacturer standards to get the full benefit of the warranty. It will make it easier when re-fitting it (just remember which end the flex was connected or take a picture on your phone).