Boiler circuit drawing....

[roguetrader]

You want expansion as close to neutral point on the system, return is cooler so in theory better for the diaphragm rubber.

 

[jason61c]

You want expansion as close to neutral point on the system, return is cooler so in theory better for the diaphragm rubber.

That makes sense.

I wonder why they put it on the flow? Loads of biomass diagrams have it on it also?

Now you've seen the boiler does the drawing make sense?

 

[Norcon]

Those are four way mixing valves in your drawing.
Will the boiler controller accommodate two?

Seems overkill for a small property. And they are expensive.
Though I expect the gravy train will pay for it.

 

[jason61c]

Those are four way mixing valves in your drawing.
Will the boiler controller accommodate two?

Seems overkill for a small property. And they are expensive.
Though I expect the gravy train will pay for it.

Its not going in a massive house, 200sq m floor area, however its an old house. We've been though about 5 calculators and its the perfect size power wise for the way its going to be heated etc. They are expensive compared to 'normal' boilers however not at the top end of what you can pay for bio mass.

The RHI does more than cover the cost, without which it wouldn't even be an option. Its what we're having though so I would like to plumb it in, in the way the designers intended, thats why its not quite 'normal' in my diagram.

The mixing valves for heating zones are the ones supplied with the boiler which its designed to control.

 

[Norcon]

So your boiler controller can receive info from two flow sensors and mix the temperature to the appropriate zones accordingly though the four way mixing valves?

Say ufh in one zone and radiators in the other.

If not then I see no point in having two.

 

[jason61c]

So your boiler controller can receive info from two flow sensors and mix the temperature to the appropriate zones accordingly though the four way mixing valves?

If not then I see no point in having two.

I'm not 100% sure as its a new way of working to me.

all the diagrams for their range of boilers that have integral/supplied mixing valves etc have 4 points on them.

I'm guessing its something like this...

http://www.esbe.eu/gb/en/products/controller-units/vrb140-cra110


I'm going to drop an email in tomorrow to ask about the extra mixing valves and how they're arranged, I think it was mentioned that they come on a prebuilt manifold, however confirmation, detailed drawings will clear it up.

 

[holty]

Weres the buffer vessel ? Blending valve to stop back rot etc. heatleak rad with closed 2 port in case of power cut. Has any off this been discussed ?

 

[jason61c]

Weres the buffer vessel ? Blending valve to stop back rot etc. heatleak rad with closed 2 port in case of power cut. Has any off this been discussed ?

If you look at the link you'll see its got a 187ltr integral buffer, 'back end' protection built in. It domestic designed from the off, its designed to cycle also too. Not totally conventional for biomass but very well regarded, very reliable, very efficient. All the protection valves are built in/pre plumbed. its designed to be a simple fit.

 

[holty]

What link ?

 

[jason61c]

What link ?

oops.

Good details, further links here...

http://www.rainbowheatandpower.co.uk/products/effecta-komplett-iii-wood-pellet-biomass-boilers