Boiler replacement

[nairb999]

Also special thanks to gas112 of course. Hope I have not missed anybody out. Such a relief to know it's a simple fix. Should I ask Baxi whether this could have had a detrimental effect on the boiler. Once again many thanks to all

 

[Johntheo5]

Don't forget to get them to remove the vent pipe from the water, its surprising they never felt the flow & return piping if not displayed in the boiler menu.

 

[nairb999]

Thanks John I have removed the pipe already. Will be talking to Baxi tomorrow to ensure the boiler has not been compromised

 

[ianmcd]

Doubt for such a short time it would have much effect on the new boiler, reason I asked origionally if the pump was new, I suspected it was the wrong way round, it was because the flow and returns were reversed, much more common than you think , with sealed system combis it is usually only the old TRV valves that suffer as the pump is inside the boiler, but on an open vent it is crucial that they are correctly orientated

 

[desktop987456]

I have labeled the original drawing from nairb999, Is my understanding correct for piping components? Sometime this month I'll have a new Heat only boiler installed (OV). Just want to make sure that I get it right; Open Vent Feed Pump, correct? And pump should be on flow pipe and after vent and feed pipes?

 

[Johntheo5]

No, that's incorrect, from the boiler, you should have, flow (left hand) pipe, then vent then cold feed then pump, VCP. the pump then pumps (downwards) the hot water to the rads and if installed, the HW cylinder coil via, normally, zone (motorized) valves, the water then returns to the boiler return to be reheated.

 

[nairb999]

Ian got me thinking. Yes pump is definitely pumping right direction

 

[fixitflav]

I have labeled the original drawing from nairb999, Is my understanding correct for piping components? Sometime this month I'll have a new Heat only boiler installed (OV). Just want to make sure that I get it right; Open Vent Feed Pump, correct? And pump should be on flow pipe and after vent and feed pipes?

I think you've labelled it wrong. The vent is usually 22mm, the cold feed 15mm, which gives boiler - vent - cold feed - pump, correct.
But unless there's no alternative, better for the pump to pump upwards, and for the cold feed to be up and under, into the bottom of the pipe, to minimise convection warming the F/E tank, encouraging algae growth.

 

[nairb999]

On reflection I think they have installed correctly

 

[fixitflav]

On reflection I think they have installed correctly

But how does that relate to the piping photo? The flow should be the left-hand pipe (assuming I'm right about the vent and feed).

 

[nairb999]

This shows the original piping to Potterton Prima boiler flow left and return right. Plumber has crossed them over to connect Baxi boiler.

 

[fixitflav]

Thread deleted.

 

[ianmcd]

On reflection I think they have installed correctly

Nope the pipes would have to be crossed, better if you mark each pipe Blue and red then follow where they go after they enter the ceiling, then mark them all the way to the cold feed vent and pump, they should all be on the red pipe

 

[nairb999]

Thanks for your assistance. I am getting the gas safe installer to check out the installation

 

[Johntheo5]

Why don't you just fire up the boiler and feel the flow&return piping??. does the boiler menu display anything as well?.