Hi


Got a central heating problem I'm a bit confused about. Top floor rad
was full of air, bled it and the water ran completely clear & clean,
just like tap water, and its a fairly old system that had good quality
inhibitor in. I figure this means a leak in the primary circuit, but
can see no sign of any leak anywhere. I can only think of one
explanation... a holed HW exchanger. Would it be right to say this is
the only possibility?

System: Standard vented header tank, old boiler, pumped primary, don't
know what plan it is.

If the above is right, presumably the solution is either a new tank
with exchanger, or adding an exchanger to the existing tank.


Regards, NT

In an earlier contribution to this discussion,
wrote:

Hi


Got a central heating problem I'm a bit confused about. Top floor rad
was full of air, bled it and the water ran completely clear & clean,
just like tap water, and its a fairly old system that had good quality
inhibitor in. I figure this means a leak in the primary circuit, but
can see no sign of any leak anywhere. I can only think of one
explanation... a holed HW exchanger. Would it be right to say this is
the only possibility?

System: Standard vented header tank, old boiler, pumped primary, don't
know what plan it is.

If the above is right, presumably the solution is either a new tank
with exchanger, or adding an exchanger to the existing tank.


Regards, NT

What are the relative levels of the water in the cold header tank for the HW
system and the F&E tank for the primary circuit? If the cold header is
higher, is the level in F&T tank rising, and getting near the overflow?
[This is the usual symptom if you have a leak in the coil in the HW
cylinder].
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!

"Roger Mills" wrote in message
...
In an earlier contribution to this discussion,
wrote:

Hi


Got a central heating problem I'm a bit confused about. Top floor rad
was full of air, bled it and the water ran completely clear & clean,
just like tap water, and its a fairly old system that had good quality
inhibitor in. I figure this means a leak in the primary circuit, but
can see no sign of any leak anywhere. I can only think of one
explanation... a holed HW exchanger. Would it be right to say this is
the only possibility?

System: Standard vented header tank, old boiler, pumped primary, don't
know what plan it is.

If the above is right, presumably the solution is either a new tank
with exchanger, or adding an exchanger to the existing tank.


Regards, NT

What are the relative levels of the water in the cold header tank for the
HW system and the F&E tank for the primary circuit? If the cold header is
higher, is the level in F&T tank rising, and getting near the overflow?
[This is the usual symptom if you have a leak in the coil in the HW
cylinder].
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!

Solids in the water may have separated out and be in the downstairs
radiators.

On Thu, 31 Jan 2008 02:24:15 -0800, meow2222 wrote:

Got a central heating problem I'm a bit confused about. Top floor rad
was full of air, bled it and the water ran completely clear & clean,

I usually find the water from bleed valves is pretty clean. If it's
noticeably dirty that indicates either a strirred-up system or a *very*
dirty one.

--
John Stumbles

I can't stand intolerance

John Stumbles wrote:
On Thu, 31 Jan 2008 02:24:15 -0800, meow2222 wrote:

Got a central heating problem I'm a bit confused about. Top floor rad
was full of air, bled it and the water ran completely clear & clean,

I usually find the water from bleed valves is pretty clean. If it's
noticeably dirty that indicates either a strirred-up system or a *very*
dirty one.

oh right, thanks Guess I've still got to figure out why the
system's full of air though.


I can't stand intolerance

Lol


NT

Roger Mills wrote:
In an earlier contribution to this discussion,
wrote:

Hi


Got a central heating problem I'm a bit confused about. Top floor rad
was full of air, bled it and the water ran completely clear & clean,
just like tap water, and its a fairly old system that had good quality
inhibitor in. I figure this means a leak in the primary circuit, but
can see no sign of any leak anywhere. I can only think of one
explanation... a holed HW exchanger. Would it be right to say this is
the only possibility?

System: Standard vented header tank, old boiler, pumped primary, don't
know what plan it is.

If the above is right, presumably the solution is either a new tank
with exchanger, or adding an exchanger to the existing tank.


Regards, NT

What are the relative levels of the water in the cold header tank for the HW
system and the F&E tank for the primary circuit? If the cold header is
higher, is the level in F&T tank rising, and getting near the overflow?
[This is the usual symptom if you have a leak in the coil in the HW
cylinder].

Good point. The F&E tank is a few feet above the HW header. Next time
I get access I'll check them, then I'll know whats happening.
Meanwhile the system styill works, just dont want to leave it to
corrode away.

Thanks, NT

In article
,
wrote:
Got a central heating problem I'm a bit confused about. Top floor rad
was full of air, bled it and the water ran completely clear & clean,
just like tap water, and its a fairly old system that had good quality
inhibitor in. I figure this means a leak in the primary circuit, but
can see no sign of any leak anywhere. I can only think of one
explanation... a holed HW exchanger. Would it be right to say this is
the only possibility?

Well I've just drained down mine to replace the rad in the bathroom with a
towel rail - and that came out pretty clean. It was last drained about 5
years ago and new inhibitor added. The water left in the rad was blackish,
though.

System: Standard vented header tank, old boiler, pumped primary, don't
know what plan it is.

Sure the ball valve hasn't stuck?

If the above is right, presumably the solution is either a new tank
with exchanger, or adding an exchanger to the existing tank.

I'd get it all working properly with no air in the rads then turn off the
supply to the header tank - tie up the ball valve etc. Note the level in
it. Then check it after a few weeks. A system in good condition can run
for years on just the contents of the header tank.

--
*I'm not your type. I'm not inflatable.

Dave Plowman London SW
To e-mail, change noise into sound.