I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason .

Later on I suddenly realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .

Anyone suggest what has gone on here .


Stuart

In message , Stuart B
writes
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason .

Later on I suddenly realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .

err ...

you have a leak

The air under pressure in the radiator which you let out meant that the
pressure dropped from marginally above to below that at which the water
pressure switch would allow the boiler to operate.

Have you been round and bled all the radiators again ?

and then repressurised ?

You need to find where the water is getting out and the air getting in -
you are diluting the inhibitor every time you add fresh water to the
system


--
geoff

On Sat, 08 Dec 2007 00:32:00 GMT, geoff wrote:

In message , Stuart B
writes
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason .

Later on I suddenly realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .

err ...

you have a leak

The air under pressure in the radiator which you let out meant that the
pressure dropped from marginally above to below that at which the water
pressure switch would allow the boiler to operate.

Have you been round and bled all the radiators again ?

and then repressurised ?

You need to find where the water is getting out and the air getting in -
you are diluting the inhibitor every time you add fresh water to the
system
Thx for that reply.

None of the rads have air in them and there are no obvious leaks (
without lifting boards) .

I now understand about the letting out of air reducing the pressure to
below the acceptable pressure .

As for your suggestion about a leak there might actually be a simpler
reason .The rad in the hall with no TRV is not one that I have
actually touched since the boiler was installed in Feb 2007 until
tonight when I went to get something that was lying beside it ( stuff
I need for jobs I am doing round the house) so it might well have been
overlooked for bleeding when the boiler was put in and has remained
cold since .That might actually have been my fault as I bled some of
the rads and the installer did some so it could have been missed as
each of us thought the other had done it . .

I have only had one occasion to top up the water in the boiler since
it was installed and even that decision was marginal so it seems
unlikely that there IS a leak but I'll keep an eye on things .

Stuart B wrote:

reason .The rad in the hall with no TRV is not one that I have
actually touched since the boiler was installed in Feb 2007 until
tonight when I went to get something that was lying beside it ( stuff
I need for jobs I am doing round the house) so it might well have been
overlooked for bleeding when the boiler was put in and has remained
cold since .That might actually have been my fault as I bled some of
the rads and the installer did some so it could have been missed as
each of us thought the other had done it . .

It is quite possible it was bled, but more air collected in it after.
With a fresh fill of water it can take some days for all of the air to
come out of suspension. The other possibility is you have insufficient
(or no) corrosion inhibitor in the system and what you bled was hydrogen
gas produced as a corrosion by product and not air.



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

Stuart B wrote:
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason .

Later on I suddenly realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .


You need to repressurise if you remove any volume form the closed
system. By bleeding you did.


Anyone suggest what has gone on here .


Stuart

Stuart B wrote:
On Sat, 08 Dec 2007 00:32:00 GMT, geoff wrote:

In message , Stuart B
writes
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason .

Later on I suddenly realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .

err ...

you have a leak

The air under pressure in the radiator which you let out meant that the
pressure dropped from marginally above to below that at which the water
pressure switch would allow the boiler to operate.

Have you been round and bled all the radiators again ?

and then repressurised ?

You need to find where the water is getting out and the air getting in -
you are diluting the inhibitor every time you add fresh water to the
system
Thx for that reply.

None of the rads have air in them and there are no obvious leaks (
without lifting boards) .

I now understand about the letting out of air reducing the pressure to
below the acceptable pressure .

As for your suggestion about a leak there might actually be a simpler
reason .The rad in the hall with no TRV is not one that I have
actually touched since the boiler was installed in Feb 2007 until
tonight when I went to get something that was lying beside it ( stuff
I need for jobs I am doing round the house) so it might well have been
overlooked for bleeding when the boiler was put in and has remained
cold since .That might actually have been my fault as I bled some of
the rads and the installer did some so it could have been missed as
each of us thought the other had done it . .

I have only had one occasion to top up the water in the boiler since
it was installed and even that decision was marginal so it seems
unlikely that there IS a leak but I'll keep an eye on things .

I find that in practice over a period of time,especially on a new
install there is a tendency for chemical reactions to turn water into
gases..that where the water is probably going.

Yeah if you flush properly and add inhibitor on installation, it happens
much less....

"The Natural Philosopher" wrote in message
...
Stuart B wrote:
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason . Later on I suddenly realised
the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .


You need to repressurise if you remove any volume form the closed system.
By bleeding you did.


Anyone suggest what has gone on here .


Stuart


How do you prove your usefulness in the house if you are not going around
checking and bleeding the radiators every few days?

On Sat, 08 Dec 2007 09:17:04 GMT, "John"
wrote:


"The Natural Philosopher" wrote in message
.. .
Stuart B wrote:
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason . Later on I suddenly realised
the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .


You need to repressurise if you remove any volume form the closed system.
By bleeding you did.


Anyone suggest what has gone on here .


Stuart


How do you prove your usefulness in the house if you are not going around
checking and bleeding the radiators every few days?




**** off **** !!

On Sat, 08 Dec 2007 04:21:37 +0000, John Rumm
wrote:

Stuart B wrote:

reason .The rad in the hall with no TRV is not one that I have
actually touched since the boiler was installed in Feb 2007 until
tonight when I went to get something that was lying beside it ( stuff
I need for jobs I am doing round the house) so it might well have been
overlooked for bleeding when the boiler was put in and has remained
cold since .That might actually have been my fault as I bled some of
the rads and the installer did some so it could have been missed as
each of us thought the other had done it . .

It is quite possible it was bled, but more air collected in it after.
With a fresh fill of water it can take some days for all of the air to
come out of suspension. The other possibility is you have insufficient
(or no) corrosion inhibitor in the system and what you bled was hydrogen
gas produced as a corrosion by product and not air.


But would all the air be in only one rad if that was the case ?

There was sufficient inhibitor put in the system as I was there when
it was put in and know how much of the container he used .
Stuart

Stuart B wrote:

It is quite possible it was bled, but more air collected in it after.
With a fresh fill of water it can take some days for all of the air to
come out of suspension. The other possibility is you have insufficient
(or no) corrosion inhibitor in the system and what you bled was hydrogen
gas produced as a corrosion by product and not air.


But would all the air be in only one rad if that was the case ?

That is quite often the case - often the highest rad in the system, or
the first one etc, but it seems common to get one that favours
collection of gas more than the others.

There was sufficient inhibitor put in the system as I was there when
it was put in and know how much of the container he used .

Jolly good. At least with sealed system then you won't have any problems
with pumping over which can draw more air in.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Sat, 08 Dec 2007 00:16:34 +0000, Stuart B wrote:

I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason .

Later on I suddenly realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but that
the rads were all cold .I went to the boiler and it wasn't providing
heat and the pressure was showing as zero and the warning lights were
showing ....I didn't note what the sequence was but I think it was the
sequence that means a low pressure .I topped up the pressure and
everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .

Anyone suggest what has gone on here .


See the SealedCH FAQ




--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

On Sat, 08 Dec 2007 12:14:34 +0000, Stuart B wrote:

On Sat, 08 Dec 2007 09:17:04 GMT, "John"
wrote:


"The Natural Philosopher" wrote in message
. ..
Stuart B wrote:
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason . Later on I suddenly
realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .


You need to repressurise if you remove any volume form the closed
system. By bleeding you did.


Anyone suggest what has gone on here .


Stuart


How do you prove your usefulness in the house if you are not going
around checking and bleeding the radiators every few days?




**** off **** !!

Am I right to believe that Suart B and "John"
must have some "previous".

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

On Sun, 9 Dec 2007 09:52:54 +0000 (UTC), Ed Sirett
wrote:

On Sat, 08 Dec 2007 12:14:34 +0000, Stuart B wrote:

On Sat, 08 Dec 2007 09:17:04 GMT, "John"
wrote:


"The Natural Philosopher" wrote in message
.. .
Stuart B wrote:
I have an Alpha CD 32C Boiler and a wireless controller in the hall
which is fitted with a rad which has no TRV .Tonight I happened to
notice that this rad was cold at the top so I bled it and there was
quite a lot of air in it for some reason . Later on I suddenly
realised the flat was getting chilly and on
investigating I found that the controller was calling for heat but
that the rads were all cold .I went to the boiler and it wasn't
providing heat and the pressure was showing as zero and the warning
lights were showing ....I didn't note what the sequence was but I
think it was the sequence that means a low pressure .I topped up the
pressure and everything seems fine now .

It seems too much of a concidence that my bleeding this rad would not
have anything to do with the boiler stopping to operate but I cannot
understand why that would be and I like to know reasons for things
happening .


You need to repressurise if you remove any volume form the closed
system. By bleeding you did.


Anyone suggest what has gone on here .


Stuart


How do you prove your usefulness in the house if you are not going
around checking and bleeding the radiators every few days?




**** off **** !!

Am I right to believe that Suart B and "John"
must have some "previous".

Not as far as I'm aware .
(but we have now tho' :-)