Dunsley Neutralizer ????


B

bell

Hi, Does anyone know what's inside one of these?

It's a bit of kit to link up two boiler systems. My dad's doing a self
build and he's going to need one but is curious as to how they work.

Thanks x
 
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I

IMM

Hi, Does anyone know what's inside one of these?
nothing. it is empty, just a neutral point.
It's a bit of kit to link up two boiler systems. My dad's doing a self
build and he's going to need one but is curious as to how they work.
He needs one? On a selfbuild he is better off using a thermal store/heat
bank, which also acts as a neutral point and gives a hell of a lot more,like
mains pressure hot water, than the Dunsley.
 
E

EricP

Hi, Does anyone know what's inside one of these?

It's a bit of kit to link up two boiler systems. My dad's doing a self
build and he's going to need one but is curious as to how they work.

Thanks x
Google for it, there's quite a bit, including diagrams. Might help
you.
 
I

IMM

IMM said:
nothing. it is empty, just a neutral point.


He needs one? On a selfbuild he is better off using a thermal store/heat
bank, which also acts as a neutral point and gives a hell of a lot more,like
mains pressure hot water, than the Dunsley.
Give me his scheme and I will suggest, if better of course, an alternative.
 
R

Rob Graham

Rick Dipper said:
There is NOTING inside them.

I had one, I was not overly impressed with it, in fact I have now
taken it out.

Rick
No point in describing it any further - it's all been said, apart
from the fact that in the system I'm using it works spendidly. I've
an oil fired boiler pumping into it and a log stove gravity feed into
it. Trying to remember the output configuration without diving into a
folder - the cylinder has to be gravity fed but is shut of with a fail
safe valve when the CH pump is on. A bit of home grown electronics
controls the system such that the oil burner is shut down if the log
stove is hot.

Plumbing it in is an keen-amateur job - no self respecting plumber
would take it on unless the customer had deeeeep pockets. In a
confined space it looks very neat but plumbing wise a 'challenge'.

I'm assuming that of the two heat sources the OP has, one needs to be
gravity run as I have. I would be interested to know how the heatbank
arrangement can be configured for this; I'm in the market for a design
for such a set-up as I need to overcome low pressure in the HW system
and am not a fan of pumps. I've been following the various threads on
the subject but have had difficulty understanding some of the piping
diagrams that have been posted.

Having said all that I went to visit a friend the other day who lives
in a stately pile where he has built a system of 2 domestic gas
boilers working in some astonishing configuration involving homemade
heat exchangers, etc; the pipework would do the boiler room of small
steam ship a run for it's money.

Rob

Rob
 
D

Dave Liquorice

I replaced it with some simple electronice, when the wood fire is
hot the gas boiler switches off, and all the zone valves open. When
the wood fire is cold, the zone value closes it off.
What is the state of the zone valves without power?
Is the gas boiler isolated when the wood fire is hot or does hot water
circulate through it?
 
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R

Rob Graham

Christian McArdle said:
The heatbank is just a huge Dunsley Neutraliser. It is plumbed in the same
way. The only differences are additions.

(1) A pumped plate heat exchanger loop to provide mains pressure hot water.
(2) An indirect coil to allow modern sealed pressurised boilers to be used.
Gravity fed (or circulated) appliances go directly to the heatbank, not
through the indirect coil.
(3) An immersion heater (or 2) for electrical backup.

Christian.
Thanks for that Christian - that makes it all nicely fall into place
though I'm not sure whther I'm confused or not by the 'sealed
pressurised boiler' bit. The oil burner I have is some 12 years old -
is that modern - there is no vent from it.

Rob
 

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