On 03/02/2011 20:06, Kostas Kavoussanakis wrote:
On 03/02/2011 09:30, Roger Mills wrote:


You *might* have a sealed (unvented) primary system - in which case
there wouldn't be an F&E tank. Have you got an expansion vessel anywhere?

No idea. Never been told to keep an eye on anything. Does the F&E tank
not fill up as needed with a cistern-type, floating-ball inlet?


The F&E tank *largely* looks after itself - using a ball-valve to top up
when necessary. *However*, because the ball valve opens so infrequently,
it can seize up - and not deliver water when required - with the result
that the F&E tank empties, and air is drawn into the system. That's why
it's a good idea to keep an eye on it periodically.
--
Cheers,
Roger
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