dennis@home wrote:

snip


How do I find the setting, do I run system until the all TRV's start
shutting (IE system reaching stable operation at nominal temperature)
then adjust the valve till it just bypasses and back it off a fraction?

The above is what I have arrived at doing some logical thinking, but
I might be wrong!

Apologies for any wrong terminology.

The bypass needs to open when all the valves are closed.
So close all the valves and then adjust the bypass so it closes and then
back it off so it is open.

OK I will do that, thanks.

The reason I was not going to shut all valves was that I have 2 towel
rads which are never shut/adjusted so I thought I would never get to the
state when everything was shut!

I see that would be the worse case scenario and will ensure a flow
across the boiler. The only minimum figure I can find on the Baxi
literature is 3 litres/minute which seem quite low!

You need to set the pump to its minimum speed when you do it so it
doesn't slow down any more and fail to open the valve in normal use.
I expect that is what the setting "adjust bypass" is for.

Yep, that's what I thought



Thanks