Reverse Return CH Piping

[cr0ft]

Hi all. Does anyone have a good reference with diagrams that explains how this works? Been asked to quote for a system which will require 2x 35KW System boilers and am wanting to install them both onto the same CH pipework. It will be a 3 zone system in a very large property.

Spoken with Viessmann and they have said the only special requirement is that they should be piped using a reverse return configuration. Can someone enlighten me? I have never installed more than one boiler in a property before.

Cheers!

 

[ShaunCorbs]

easier to look at pics, and it just balances the flow through the system

Insulation Outlook Magazine, your guide to industrial and commercial insulation

 

[stevetheplumber]

one ive never realy understood but the idea is you get the same resistance across each rad

 

[chris watkins]

Otherwise know as "first in - last out"

so if boiler one's flow is the first to connect to the pipe work then the return is the last.

Personally I would still use a low loss header even on a job like this.

 

[chris watkins]

View attachment Low Loss pipe work Drw 2.pdf
View attachment Low Loss pipe work Drw.pdf

These might help ?

 

[Masood]

Agree with Chris. Low loss header all the way...

 

[Scott_D]

Reverse return to the boilers or reverse return to the radiators ?

 

[tolly]

View attachment 24634
View attachment 24635

These might help ?

who did those drawings out of interest chris?

 

[tolly]

I think they would have meant only a reverse return on the boilers on primary side, so it still includes a LLH

 

[tolly]