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Parkray Chiltern and my central heating system/ hot water


 
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awja

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PostPosted: Tue Aug 12, 2008 12:08 pm Reply with quote

Can anyone help me with the following:-
I have a Parkray Chiltern and an unknown make of tank.
As far as I can see the system is set up as illustrated below.

I am curious to know how the heating water is kept seperate from the hot water to the taps.
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pete2bram (25 Aug 2009)
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spacethegas

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PostPosted: Tue Aug 12, 2008 12:49 pm Reply with quote

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awja

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PostPosted: Tue Aug 12, 2008 12:55 pm Reply with quote

That's what I thought but how does the whole system (Central heating & fire back boiler) get filled with water from just filling the tank ?
There must be some physical connection between the two parts.
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spacethegas

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PostPosted: Tue Aug 12, 2008 1:00 pm Reply with quote

generally there are 2 tanks in the attic.
the large one feeds the h/w. the small one feeds the boiler & heating.
alternatively you may have whats called a primatic cylinder.
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awja

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PostPosted: Tue Aug 12, 2008 2:06 pm Reply with quote

spacethegas
Thankyou for that.
It must be a primatic tank as I have just had a look at how they work and they fit the description to a tee.
I now know basically how they work now but if you know of any web sites that give an in depth description/diagrams it would be appreciated as this is the only diagram I can find and it isn't very good.
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spacethegas

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PostPosted: Tue Aug 12, 2008 5:08 pm Reply with quote

all the detail you need to know is in the diagram.

the only thing that separates the dhw & heating is an air bubble.

its not generally considered to be a good idea nowadays.

you cannot introduce any chemicals to protect the heating system as there is no physical barrier between the two systems & there is always the possibility of loosing the air bubble with the consequence of contaminated dhw.

also if an airlock were to develop within the heating system you will not have the option of backfilling the system.
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tomm174

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Joined: 23 Feb 2013
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Location: Wallis and Futuna Islands

PostPosted: Sat Feb 23, 2013 10:32 pm Reply with quote

awja wrote:
spacethegas
Thankyou for that.
It must be a primatic tank as I have just had a look at how they work and they fit the description to a tee.
I now know basically how they work now but if you know of any web sites that give an in depth description/diagrams it would be appreciated as this is the only diagram I can find and it isn't very good.


Here's something
http://www.go-repairs.co.uk/#/cylinder-types-continued/4535075835
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Terrywookfit

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PostPosted: Sun Feb 24, 2013 9:57 am Reply with quote

It should not be fitted on a Primatic system.
Installation instructions state that it should be a "Double feed indirect".
A heat leak rad is also needed.
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Nige F (24 Feb 2013)
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