S PLAN WIRING DIAGRAM WITH UNVENTED CYLINDER

Zone valve wiring in Y plan system with unvented cylinder
Feb 07, 2012The problem is that Telford only show a wiring diagram for an S Plan in the installation manual; though they do say that a Y plan can be used, with the safety "zone" valve. Unfortunately the installer has not been able to work out how to wire it! The problem is due to the combined cylinder stat and overheat stat.
Wiring Diagrams - Honeywell UK Heating Controls
FAQ Wiring Diagram S Plan Pump Overrun (ST9420 and DT92E) FAQ Wiring Diagram S Plan Plus Pump Overrun (ST9420 and DT92E) FAQ Wiring Diagram Combination Boiler (ST9120) Honeywell T4 Additional Wiring Diagrams LYRIC T6 Additional Wiring Diagrams V4043 Zone Valve S Plan Operation Heating Controls Wiring Guide Issue 17
Wiring a cylinder stat (unvented cylinder) | DIYnot Forums
Oct 25, 2009the unvented cylinder comes with a 2 port valve, go out and buy another and rewire it as an s plan,(you will need a wiring centre as well) at least your customer will have heating and hot water and you can put this one down to experience.[PDF]
Installation guide - wiring & plumbing
• ‘S’ plan wiring centre • Cylinder thermostat • Hot water time clock • Auto bypass valve Motorised / Zone valves and Pipe stats are available if requested. Plumbing and Wiring Schematics Section A System Boiler with hot water cylinder, radiators & UFH 1a) Plumbing Schematic[PDF]
Installation Manual - mainheating
The cylinder is a purpose designed unvented water heater. The unit has a stainless steel inner vessel, which ensures an excellent standard of corrosion resistance. The outer casing is a combination of resilient thermoplastic mouldings and plastic coated corrosion