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