S plan daigrams and good place to buy 2 port valves?

[D_Hailsham]

I suggest you pipe it like this:

Untitled

• D_Hailsham
• 16 Apr 2010
• 1

 

[robbie77]

Thanks again. Much appreciated

Drain Tap is difficult to get to as it's next to a wall, can I just add a drain cock on the F& E feed (also a B outlet). I noticed the F & E feed is 15mm rather than 22mm is this normal? I was thinking that's a big reduction on the boiler outlet!?

 

[D_Hailsham]

Drain Tap is difficult to get to as it's next to a wall, can I just add a drain cock on the F& E feed (also a B outlet).

Yes.

I noticed the F & E feed is 15mm rather than 22mm is this normal? I was thinking that's a big reduction on the boiler outlet!?

22mm is OK. It does not really matter as this pipe is really only used when refilling the system.

 

[robbie77]

I suggest you pipe it like this:

Untitled

• D_Hailsham
• 16 Apr 2010
• 1

I have been looking at the logisitcs of the layout and and am very pleased to have a plan!
I do however see myslef having to run more pipes up to the loft than I would like (if it needs to be done it, needs to be done!).

Is there anywhere else I could tee the F&E vent pipe from rather than from A on the right hand side? It just means hassle of making room in the joists and a fair bit more copper!?

Thanks

 

[D_Hailsham]

Is there anywhere else I could tee the F&E vent pipe from rather than from A on the right hand side? It just means hassle of making room in the joists and a fair bit more copper!?

Where is the pump located? If it is on the flow from A (left) on the boiler, both the feed pipe and the vent pipe can be installed this pipe. Then the RH A and B connections are not used. See my earlier post about correct order.

The problem which has to be solved is making sure that there is not an excessive pressure difference between the feed connection and the vent connection. This is why the distance apart must not be more than 150mm (The pressure drop across the boiler is about 60mm)

PS How exactly are the feed and vent pipes connected at the moment?

 

[robbie77]

The pump is located exactly as you put it in your diagram.
As to how the heating is at the moment well there isn't any as I have removed the old tanks and am in the process of installing new ones.

The plumber said it was all wrong so I disconnected it all. A and B on the right hand side I think were connected to the HW tank so he said that there was a danger of it overheating.
He seemed to think I would need a 22mm pipe going to the right hand side (feed for the F&E I think) and block the other outlet off but this involves extra pipe?

So you think I could block both sides off?

 

[D_Hailsham]

The pump is located exactly as you put it in your diagram.

I was thinking more of it's actual location. If the pump is right next to the boiler you have two choices:

1. Install the vent pipe as in my diagram.

2. Relocate the pump so it is in the airing cupboard with the HW tank.

The feed and vent pipes are then connected to the flow from the boiler just before the pump. They can connect anywhere on the pipe between the boiler and the pump as long as they are in the correct order and no more than 150mm apart.

Of course, if the pump is already in the airing cupboard, just below the tank, you can connect the feed and vent pipes there.

He seemed to think I would need a 22mm pipe going to the right hand side (feed for the F&E I think) and block the other outlet off but this involves extra pipe?

The feed is always 15mm; the vent has to be 22mm.

So you think I could block both sides off?

If the feed and vent are connected to the flow between boiler and pump, you can block of the A and B connectors on the right side of the boiler.