Low loss headers and zone valves

[Sharp Point]

Evening all,

Can I ask you good folk, if low loss headers require a zone valve after the pump for each zone? My zones are ufh, towel rails and hot water.

Thanks in advance

 

[Scott_D]

a pump on each zone or one pump for all zones?

 

[ShaunCorbs]

No just a nrv on the flow if pumps on return etc

 

[Sharp Point]

I’ve seen a few installs with zone valves on, KOP put a pictures yonks back, that he’d done with zone valves.

 

[ShaunCorbs]

Saves using a relay upto you

 

[Last Plumber]

A lot depends on the circuits you're controlling. If it's domestic or a small installation, you could get away with a small domestic sized pump/one size of pump for all circuits, (as long as the index is covered). That's possibly why KOP used the zone valves, (I'm guessing). On Commercial it is done in different ways owing to what the different types of circuit might be, so as Shaun said, you normally see different sized pumps and NRV's as a basic.

 

[Sharp Point]

Thanks for your replies, I’m talking about zone valves with a pump for each circuit

 

[Last Plumber]

Thanks for your replies, I’m talking about zone valves with a pump for each circuit

If you use three pumps that's your choice.
If you don't use a valve or NRV then all three circuits could warm up when any one of them is on.
i.e. If you install three pumps, one on each circuit and only one pump switches on, you will have nothing to prevent flow through other circuits. Even if it is by Gravity. It might not do of course, it might work well depending on the installation pipe work but I would want a more positive set up. I would probably use MV's and one pump by the sound of the installation.
I might be misunderstanding your question here Bogrodder.

Installations that utilise different pumps for different circuit/duties only really/usually need an NRV to prevent circulation in other circuits when those circuits are piped off a LLH. If you want to use three pumps, off a LLH then you could use NRV's. You would need something though in my opinion. I have not seen the set up so it's difficult to say for certain.

 

[Sharp Point]

Made a start yesterday people

 

[ShaunCorbs]

Drain offs bog ?

 

[Sharp Point]

It’s still a work in process Shaun. That’s on the final stretch

 

[Gasmk1]

Drain offs bog ?

one on the low loss header

 

[Sharp Point]

one on the low loss header

Yes GM1

 

[Last Plumber]

Is that 15 mm pipe tee'd in after between pump and Boiler for the F&E (fill or feed and expansion)?
If it is, I would have placed it behind the pump.
It won't make a huge difference in all honesty due to the Header but I still think it better to do it that way. Others may disagree with that of course. We all work our own way.

 

[Sharp Point]

Is that 15 mm pipe tee'd in after between pump and Boiler for the F&E (fill or feed and expansion)?
If it is, I would have placed it behind the pump.
It won't make a huge difference in all honesty due to the Header but I still think it better to do it that way. Others may disagree with that of course. We all work our own way.

Yes, it’s actually a 22mm for the expansion vessel and the prv point.

 

[Sharp Point]

There’s no room below, as the magnaclean is going there

 

[Last Plumber]

Yes, it’s actually a 22mm for the expansion vessel and the prv point.

My apologies. It looks small on the photo.

 

[Sharp Point]

My apologies. It looks small on the photo.

It’s these bloody phone cameras lol

 

[Sharp Point]

Third days progress, been slow today...as I’ve been connecting all the pipework in the false ceiling above. Up and down flipping ladders all day. Can I ask you good people if 1.5” solvent weld waste waste pipe and fitting would be suffice enough for the outlet from the Sanicom2?

 

[ShaunCorbs]

@rpm

 

[Sharp Point]

@rpm

Oh, I’ve forgot to ask Shaun. Has anyone from saniflo contacted you?

 

[ShaunCorbs]

Oh, I’ve forgot to ask Shaun. Has anyone from saniflo contacted you?

No why ? Was I supposed to do something

 

[Sharp Point]

No why ? Was I supposed to do something

I’ll pm you.

 

[Sharp Point]

End of week progress. I’m still waiting if stuff to arrive, was hoping to get filled up today.... but I didn’t fancy filling up on a Friday.... for obvious reasons

 

[ShaunCorbs]

Bit of a restriction going down from 40mm to 28mm ?

Nice tesla tun tho