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ericmarc. In the Bosch Greenstar boiler in question there are 3 neutrals as follows: N - Netral of incoming supply Ns - Neutral of control circuits Np - (sometimes Pn or Nz) - Pump Neutral for remote pump (switched from boiler). Bosch seem to have a range of wiring conventions in their...

I don't see the point of your last sentence. It seems you needed to Google to find some of this stuff out. Anyway through my research (like yours) it seems as if in some of their boilers (not all) Bosch are catering for countries/situations where there is a need for the control circuitry to be...

Apparently they're very tight lipped about technical design details like this. They'll help with faults and operating stuff but not design details.

Muggles that's not correct. If you wire it the way Bosch want then N would be the Boiler neutral, Np would be the pump neutral and Ns the neutral for everything else in the wiring centre ie Programmer etc. That's the whole point Bosch want them kept distinct.

Thank you Picasso. So if I common the neutrals in the boiler the power to the lives will still be cut when the boiler is switched off at the boiler controls in the way that Bosch require. ie communing the neutrals will not affect what Bosch are trying to achieve ? Thinking about it in that case...

I know how a conventional boiler is wired with 5 cores. However if I only use 5 cores them I'm not keeping N, Ns and Np separate in the way that Bosch. I am trying to understand why Bosch separate them onto separate terminals. Once again I'll state my original question. Can I loop N, Ns and Np...

Please look at my original question. I know that other boilers can be done with a five core. My question is can I join N, Ns and Np together in the boiler and just use one neutral away from the boiler. There must be a reason why Bosch Greenstar separate them ? I'd like to know what the reason is...

Are you familiar with Bosch Boilers. It's a heat only boiler feeding a vented system on Y-Plan and 3-port valve doing C/H and HW. Controlled by a programmer on an industry standard backplate. 240 volt supply is from an FCU to programmer and from there to boiler and also to programmer. Cable to...

I will be having a Bosch Greenstar Boiler fitted and currently only have a 5core cable to the boiler position. My question is can i join N, Ns and Nz (pump neutral) together at the boiler to reduce the numbers of cores required ?