If your pumps has to be wired directly to the boiler, connect it to terminal nine not 10 as shown and connect 9 to the boiler's pump live terminal. A way to keep up to date with what's going on with the British tile industry around the globe. Takes about 10 seconds 5. I can see how the thermostat and valves can communicate with the programmer but not vice versa? If you want full and comprehensive advice then watch the instructional video below! This closes a switch in the valve which applies voltage to the boiler to light it. The Y Plan system is less complicated as there is only one three port valve needed.
With no power applied, a spring holds the valve closed so no water will flow. The third valve thermostat has a three core and earth wire. Blue wire of third valve connects to the neutral terminal on the junction box usually terminal 2 Grey wire connects to the Live terminal on the junction box usually terminal 1 Orange wire connects to same terminal as the orange from the other two valves. You can buy a new one from Screwfix. When the motor head goes to move the valve position it burns the head out. When the heating turns on, voltage is applied to the motor, via the programmer and the room thermostat, which opens the valve.
The motorized valve is held in the closed position by a spring. If you buy the boiler and get the engineer to fix it for you, then you avoid their mark up and save money. Both are designed to closely control your heating system, diverting heated water to where it is needed according to thermostats and controls. S Plan Wiring C Plan Schematic Gravity hot water controlled by a 6 wire valve not your standard 5 wire valve and a pumped central heating circuit controlled by a thermostat. How to change a 2 port valve: 1. Turn off all heating components electrically 2.
When I switch the programmer to heating off, it does not go off so something must be wrong somewhere. Most customers find it easier to allow their installation engineer to buy the parts but this is not always the cheapest option. If heat is required, power continues to terminal 5 in the wiring centre, and operates the motor in the central heating valve. E-mail me at if you would like copies. We found a few suppliers that deliver them next day. If problem remains, the downstairs valve has a sticking internal switch.
Fit the new valve and follow the instructions on how to wire it up. Therefore you need a certain sequence of switches to work in order for the system to operate. I am assuming when I set the programmer to heating off, somehow a signal is getting to the valve and thermostat to stay off? There are some more terminals maybe 4 or 5 from memory, does anyone have a wiring diagram for this controller or just an explanation of what to do to link it to the valves? The Ns according to boiler manual is Neutral Supply not switched neutral. The 2 port valves serve one service each. This video covers the wiring and electrical operation of an S plan system with two 2-port valves.
I have two thermostats, only one wired in on the downstairs and this turns on and off with the thermostat so maybe there is an issue with upstairs thermostat wiring does not have a thermostat attached at present but is made safe. Fill the heating system and vent any air out. Temperature control can be provided by two room thermostats. When I switch the programmer to heating off, it does not go off so something must be wrong somewhere. It should cost between £125. Also switched neutral Ns is redundant. Please contact me if you need any further advice or have ideas to improve this article.
Once the valve is fully open, a switch inside connects the grey and orange wires together. Operation - Hot water and central heating This is simply the above two diagrams combined. The programmer reaches a timed period where the radiators require heat. Hi Guys I currently have a combi boiler with a single prog stat wired direct to the boiler. The room thermostat is shown with a neutral connection.
Therefore problems with the valve will mean the boiler never switches on, or in some cases will run continuously. If you like the design on our website, please do not hesitate to visit again and get inspiration from all the houses in the design of our web design. This arrangement is common on new installations, as it allows for multiple heating zones with the minimum of additional plumbing and wiring. Some or all of these will be live depending on which modes are selected - these are highlighted brown in the other diagrams below. Then you should have a permanent live that is switched by the 2 port valve itself that goes off to the boiler and pump. Both systems have there own wiring centre and both wiring centres want a switch wire connecting to the boiler. I haven't removed the upstairs thermostat to test yet but it looked like that number 7 on the wiring box had my upstairs thermostat switched live wired to it and also brown wire from the second valve.