This has one inlet and two outlets one for hot water the. The two way switch is essential for the wiring method which makes this system work.
How Does An S Plan Heating System Work Boiler Boffin
Central heating wiring diagram 3 way valve. Full wiring diagram 3 port mid position valve room stat off and cylinder stat off. Room stat on and cylinder stat off. Here coloured wires indicate the permanent mains supply to the boiler and programmer. Mid position valve opens hot water b by default. Contains all the essential wiring diagrams across our range of heating controls. The diagram set includes wiring plans for a number of popular configurations of central heating systems c plan w plan y plan s plan s plan etc.
For full information about the c plan design and. Part 4 in the heating wiring series covers how the 3 port mid position valve works internally allowing 3 separate positions from only 2 mains inputs. Electrical wiring for central heating systems. The three additional coloured valve wires are also shown white grey and orange. Click the icon or the document title to download the pdf. It has a two way switch that operates when the valve opens rather than the simple onoff switch of the 22mm valve.
Part 3 in the series looks at y plan wiring a system which uses a single 3 port valve. Mid position valve opens central heating a. This diagram shows the wiring layout using the most typical components. Central heating diagrams showing pipework layouts for the various types of heating system. No power to boiler and pump. Honeywell make a large range of motorised valves used in domestic central heating systems.
And you should select the most appropriate diagram that matches the components you have installed in your system along with what youre hoping to achieve in terms of controllability. Wiring diagrams and further information continues below. Heating controls wiring guide issue 17 v4073a y plan how a mid position valve operates within a y plan heating system. The most common by far are the 22mm 3 port 5 wire mid position valve and the 22mm 2 port 5 wire zone valve. These 22mm valves 3 port v4073a1039 and 2 port v4043h1056 are used in smaller and medium sized properties. Probably means nothing now as it was fitting over 25 years ago but did find a small wiring diagram on it says brown mid posn brownwhite dhw brownblack htg.
Had a look it says tower heating components model t679br340 30l0.
Gallery of Central Heating Wiring Diagram 3 Way Valve
