Help with pumping over on incorrect system layout (I believe!)

[Best]

OK 10:4 on abv I will put in t across the coil... If I try the combining as suggested above I will still have the vent after the pump but I am assuming that the combined now has the feed pressure from the header tank therefore more resistance than before and hopefully the flow will not be up the vent.(unless of course it needs to)
Again appreciating the help..

No, what the combined feed and vent will mean is that there is no path for the water to flow and return. Because you have effectively one single pipe used as a feed & with a vent teed off it, then for the water to flow up it has no path of return, if you know what I mean.
The way yours is done will mean the water goes up the vent & the displaced water is replaced from the heating tank down the feed, - basically like a radiator.
The point above about the position of vent on end of tee is an interesting one, but if the water has an easy route it will take it on a twin feed & vent set up, no matter how you tee off.
Tbh, I do not like the combined feed & vent as I know plenty of jobs suffer from magnetite on those systems. The close coupled arrangement is perhaps better, but I also think it is not that good & I know air can be an issue.
Sealed system is the way to do it. If the pipe work seems sound I would go that method, but plastic push fit is a worry. The extra pressure is not huge - system only needs a max of 1 bar usually with oil boiler

 

[doitmyself]

OK 10:4 on abv I will put in t across the coil

Before the motorized valve, i.e in place of the existing bypass.

Check with Warmflow before you decide to use a combined feed and vent.

 

[uwavetv]

Hi yes sorry I meant before the MV not directly across the coil...thanks Best for the guidance I would go on sealed but not sure the whole system is all pushfit plastic apart from 0.5 m off the boiler... I once plumbed a whole renovation (that I though I was staying in) in full 22mm copper apart from into the rads (15mm) and it was a dream.. Hot rads, flow etc.. etc anyway those pushfits i have now make me nervous...and yes exactly as you say the current system is up the vent and down the feed as I have no level change in the f&e tank ...

 

[uwavetv]

Hi again, just to check on suggested options I have updated the drawing, am I correct in Ting into at point "1" on my schematic or what about "2" and point "3"?
Also should I change the feed down from tank to 22mm to match the vent?
Thanks again

 

[ShaunCorbs]

can i ask where are you calcs to say you need your vent 1m above your f+ tank, and get and heating engineer in before you break something

 

[IDCHAPPY]

Seal the system.

 

[uwavetv]

Hi Shaun, the 1m is where the heating engineer (paid with hard earned cash) came to fix the problem, he moved it up from 0.5m.. job done, wallet lighter....

 

[ShaunCorbs]

Hi Shaun, the 1m is where the heating engineer (paid with hard earned cash) came to fix the problem, he moved it up from 0.5m.. job done, wallet lighter....

something is wrong if you need it that high on a normal domestic house

 

[uwavetv]

well from what I have picked up on this I have a system layout that is not suited to S Plan fully pumped and TRVs.. with not being able to get the feed and vent connections at the correct point in the loop.. so I am trying to make the best out of it...

 

[ShaunCorbs]

well from what I have picked up on this I have a system layout that is not suited to S Plan fully pumped and TRVs.. with not being able to get the feed and vent connections at the correct point in the loop.. so I am trying to make the best out of it...

what boiler and cylinder you got? (make and model plz)

 

[Best]

what boiler and cylinder you got? (make and model plz)

He said earlier that it is a Warmflow 90/120 oil boiler. Little odds really, - he should be getting a heating engineer in to sort it. Really silly trying to sort it by guess work and it's not a DIY task.
First thing should be considered is viability of sealing the system. Connecting the vent and feed together is not a fantastic solution.

 

[ShaunCorbs]

He said earlier that it is a Warmflow 90/120 oil boiler. Little odds really, - he should be getting a heating engineer in to sort it. Really silly trying to sort it by guess work and it's not a DIY task.
First thing should be considered is viability of sealing the system. Connecting the vent and feed together is not a fantastic solution.

+1 boiler is able to be used on a sealed system from new

 

[uwavetv]

I have a Warmflow B90-120 27 to 47 kW with a Riello RDB oil burner, pump is Wilo GOLD 50. Cyclinder make I don't know but it is a standard domestic I would say with one coil.......

 

[Best]

I have a Warmflow B90-120 27 to 47 kW with a Riello RDB oil burner, pump is Wilo GOLD 50. Cyclinder make I don't know but it is a standard domestic I would say with one coil.......

Well straight away it is wrong! The pump is wrong type.
Bad news is proper pump will make things worse if system remains unaltered.

 

[uwavetv]

OK, so recommendations on re piping/layout and or pump? what should I do and I would be fine with paying for a solution if someone comes here that knows what they are doing to correct once..