On Thu, 16 Sep 2004 01:04:50 +0100, IMM wrote:


"Ed Sirett" wrote in message
news
On Tue, 14 Sep 2004 11:31:53 +0100, Christian McArdle wrote:

"Components:

A filling point.
A pressure relief valve and discharge pipe.
An expansion vessel
A pressure gauge"

"Automatic air vent" should be one of these points.

There is no requirement for an automatic air vent on a sealed
pressurised
primary circuit. Sure, they're very useful and labour saving, but many
systems do not have them installed.


Although combis are invariably sealed systems and invariably contain an
automatic air vent I did not consider that they were an _essential_ part
of a sealed system.

I would.

There is nothing to stop you writing your own superior FAQ with Answers on
Sealed CH systems.

From my point of view a FAQ document is neither intended nor required to
give information on every aspect of the subject. Indeed there is no mention
in my FAQ on selecting the size of the vessel or precise adjustments for
very tall systems (e.g. 5 storey town house.).

The FAQ has already made a dent in the number of postings on the subject,
and freed up time effort for other more unusual questions to be discussed.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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