This diagram shows the wiring layout using the most typical components. These are shown at the bottom right of the diagram.
Boiler System Unvented Boiler System Diagram
Unvented cylinder y plan wiring diagram. The unit has a stainless steel inner vessel which ensures an excellent standard of corrosion resistance. Wiring diagrams and further information continues below. These terminals are joined together with the grey wire from the motorised valve. The outer casing is a combination of resilient thermoplastic mouldings and plastic coated corrosion proofed steel sheet. Orange grey wires from ch zone are not required please isolate opentherm make safe. X range x plan wiring diagram unvented cylinder option gyellow cut off dhw sl coil.
The cylinder is a purpose designed unvented water heater. Wiring is based on the standard y plan with the addition of a high limit thermostat and a 2 port motorised valve. In a y plan heating system you must have a wire connecting the hot water off terminal at the programmer usually terminal number 1 and the satisfied terminal on the cylinder thermostat. The problem is that telford only show a wiring diagram for an s plan in the installation manual. The problem is due to the combined cylinder stat and overheat stat. Unfortunately the installer has not been able to work out how to wire it.
All products are insulated. Here coloured wires indicate the permanent mains supply to the boiler and programmer. Output from the normal cylinder thermostat is connected to the high limit thermostat and the output from that powers the 2 port valve motor. Though they do say that a y plan can be used with the safety zone valve. This video covers the wiring and electrical operation of a y plan system. Heating control ntc cylinder sensor connect timer to the no dhw demand nc no dhw e orange grey 2.
Gallery of Unvented Cylinder Y Plan Wiring Diagram
