Discuss S plan heating system in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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As shown, but need an isolator to each boiler. Assuming that it is switched live, N&E to each boiler.
 
Hi,surely you mean in parallel,with isolation? In series,would give the return/flow sensors,something to think about...
 
Two boilers in series. If there’s a Fault with one they still have heating and hot water. They have fitted a low loss header to the system aswell

You didn't think to.mention the low loss header at the start of the thread then?

Based on this new information you will almost certainly have a boiler circulating pump which will need to be controlled by both boilers via a relay. This pump circulates water from the boilers into the low loss header.
The second pump will be circulating water from the low loss header and around the CH and DHW zones.

Worcester bosch will send you a wiring diagram of how to connect two of their boilers together if you give their tech support a call. It is important that you do this bit correctly otherwise you may damage the boilers or create a dangerous situation for anyone working on them in the future.
 
Have a look at boiler sequencers

....I have done...many,many times:)
This is why i know they are paralleled and not in series.

I did a two line post,hoping to get more detail,and Dave blew us out of the water with his thorough retort:)

These are systems and features,which are not added "ad-hoc",most generally specced and designed from the get-go. If this is the case,there will be system drawings for both the hydraulic and electrics.
If not,Dave's last paragraph is applicable.
 
Hey guys. I got this information off the plumber today, we’ve got 3 wireless programmers, 3 x 2 ports (heating) 1x 2 port for the cylinder,frost stat, 2 x secondary heating pumps (they’re the main system heating flows,stats will control these)2 x primary heating pumps (shunt pumps) cylinder stat, and secondary return hot water pump ,
2 x Worcester 40 cdi classics, 2 x grundfos 25/80 SF pumps, 2x grundfos 15/60 PR pumps, 3x Honeywell 2 port valves (heating) , 1 x Honeywell 2 ports (hot water circ) cylinder stat, frost stat and grundfos gold pump HWSR, #CONTROLS# 3 wireless single channel programmable room thermostats, 1 x wired hot water timer
 
It’s simple to wire if you break it down. It’s a lot of work to try and explain it or knock up a diagram. It might be easier if you do a diagram and I/we can tell you what needs changing etc if anything.
 

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