"Roger Mills" wrote in message
...
In an earlier contribution to this discussion,
dennis@home wrote:

"Roger Mills" wrote in message
...
I know that something similar was discussed recently, but I'm not
sure that there were any concrete conclusions.

I'm currently trying to fine tune my system, and am having great
difficulty in achieving a satisfactory set of settings. [See my
other post on non-contact flow meters.]

SNIP
Any comments?

I thought the idea was to maintain constant flow not pressure.

The idea of what?

The idea of a variable speed pump certainly *isn't* to maintain constant
flow - but to back off as more amd more TRVs close, maintaining flow just
through the rads which are still open. This implies keeping the pressure
constant (by reducing the speed) as the flow reduces.


Ok so I should have said a minimum flow.
The pump I have came with a chart which showed over which head and flow it
would operate on the different settings.