s plan

[ShaunCorbs]

Not necessarily. The reason it is always on return on modern boilers is because the pump is on the return. Hence the filling loop and exp vess position.

This entry point, (just like an open vented system where cold feed /expansion pipe enters), creates a neutral point. Between neutral and pump rear is negative, from front of pump through system and back to neutral point is under positive pressure. It will work without doing that of course but your whole system would be under a slight negative pressure and that's best avoided. You need to try and design any system with a positive pressure if possible.

This is theory and there are exceptions to the rule but in general thats the best way

Thank you for explaining it will amend it to behind the pump, other than that anything else you see ?

 

[Last Plumber]

Thank you for explaining it will amend it to behind the pump, other than that anything else you see ?

No I don't think so, I'm taking it the boiler is underneath the pump and mag

 

[ShaunCorbs]

No I don't think so, I'm taking it the boiler is underneath the pump and mag

no in kitchen, thats all going in airing cupboard

 

[Best]

Can you not just fit the pump on the return Shaun? (That's if the pump is outside the boiler I am assuming?). That would make your drawing all spot on then. Expansion vessel on suction side of pump etc. Not that it makes much difference, as long as it wasn't linked immediately after the pump, like some do it.
On another point, - I fit the PRV to the boiler pipes, where expansion vessel is not at boiler.

 

[ShaunCorbs]

Can you not just fit the pump on the return Shaun? (That's if the pump is outside the boiler I am assuming?). That would make your drawing all spot on then. Expansion vessel on suction side of pump etc. Not that it makes much difference, as long as it wasn't linked immediately after the pump, like some do it.
On another point, - I fit the PRV to the boiler pipes, where expansion vessel is not at boiler.

the pump is external (worcester 24ri) and could do you mean like this?



and on this one i couldnt fit a prv as all of it is under the floor / in boxing

 

[Best]

the pump is external (worcester 24ri) and could do you mean like this?

View attachment 27864

Yes, that's what I was thinking. I don't do much work on gas systems, mainly oil, but same principles.

 

[ShaunCorbs]

It's getting there slowly





It's been a pig of a job airing cupboard being too small really and joist layout

 

[gmartine]

Tidy...what's that pipe racking called again?

 

[ShaunCorbs]

Tidy...what's that pipe racking called again?

uni strut 21x21

 

[ShaunCorbs]

Nearly there rads are done and piped up, least I can get of my knees now just tank in the loft for the hot water