"Peter Hemmings" wrote in message
. uk...
Hi,

I have just changed my pipework and have added an automatic boiler bypass
valve so the boiler (Baxi Barcelona) does not control the pump (pump
stopped and started at beginning of heating cycle). This was required if
no valve was fitted.

I have a energy saving pump (Alpha +) which varies speed with back
pressure and want to manually set the bypass valve.

The valve information asks for information on boiler minimum flow pump
head etc and to read across a graph to obtain the "setting" on my
Honeywell valve.

This all seems to be a bit complicated and I have just noticed that the
pump has 3 manual settings, the slowest is for "adjusting bypass valve"!!

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.


Regards

The bypass valve gave the pressure it opened on a dial. So I set it at a
pressure where I knew the pump could still pump water round according to the
pump spec sheet (at the minimum speed).