"Ed Sirett" wrote in message
...
On Thu, 08 Feb 2007 17:04:26 +0000, Roger Mills wrote:

In an earlier contribution to this discussion,
curiousdog wrote:

I have what I think is a conventional heating system (perhaps, maybe)
and have had several challenges over the years, must to do with the
motorised flow-control valve breaking.

More recently I have a concern with the pump. It's installed
vertically pushing against gravrity up to the valve where it splits to
the heating and the storage tank. On setting 1 it runs very quietly
but the pressure seems to be very low and the radiators don't really
heat up as they should. The water in the storage tank also takes
forever to re-heat. I am pretty sure there are no airlocks anywhere.

So, logically, I tried to set the pump speed to 2. The pump speed
picks up and makes a lot more noise and then stops and restarts
itself. There also seems to be a lot more noise in the pipes, water
sounds. But the end result of all this is a lot of air that I have to
keep\bleeding out every 15 minutes.

So, is the pump faulty?

I doubt it.


Should it be installed vertically pushing against gravity?



Mindset change required - consider it to be a "Circulator" rather than a
pump. The heating circuit is a loop - the "circulator is merely making the
water flow around the circuit. The height of the system has no effect.