On Wed, 24 Nov 2004 23:40:01 +0000, a particular chimpanzee named Andy
Hall randomly hit the keyboard and produced:

On Wed, 24 Nov 2004 23:22:27 +0000, Hugo Nebula abuse@localhost
wrote:

On Wed, 24 Nov 2004 22:30:02 +0000, a particular chimpanzee named Andy
Hall randomly hit the keyboard and produced:

You could incorporate a flow switch, but normally the other controls
do the job.

If there wasn't a room thermostat, what would happen then?

If you are just relying on the boiler thermostat to control the room
temperature then there is noting apart from the timer to turn off the
heating. This isn't much different from the over-run point of view to
a room thermostat turning off the boiler when the room is warm.
Either way the burner can be turned off when at full power and the
system is hot. Possibly though, if you are using the boiler
thermostat to control room temperature, the boiler water temperature
will be some way below the intended 80 degrees.

It does exactly what you describe. It's my mother's system. The
boiler was replaced recently, but the controls weren't upgraded, and a
bypass wasn't fitted. Now, clearly this doesn't comply with the
Building Regulations, but I've had a hell of a job to even get the
installer to fit a bypass (which he's supposed to be doing next
Tuesday).

I was wondering if some sort of flow switch could be incorporated in
the bypass to act to turn the boiler off when it's activated. Is this
the role of an 'automatic bypass valve'? From the photos on various
websites, they just look like mechanical affairs, and I don't know
where the 'automatic' part comes in.
--
Hugo Nebula
'What you have to ask yourself is, "if no-one on the internet wants
a piece of this, just how far from the pack have you strayed?"'