On Mon, 11 Aug 2003 17:04:21 +0100, "Jonathan"
wrote:

It says "After installation and commissioning, a new central heating system
should be balanced." And says: The "...aim of balancing is to achieve the
correct temperature drop across the boiler flow & return pipes (11°C)."

Balancing involves making sure that the radiators on the system each
get a share of the water flowing thru the CH waterways. Water always
flows best thru the path of least resistance.

What you effectively do is close down the return valve of the
radiators (the valve which is fixed, which the user doesn't crank the
handle of), thus restricting the flow to each radiator. That
restriction ensures that there is enough pressure in the system to
force water to the other radiators. Getting those return valves set up
correctly is a bit of an art. When I've done this in the past I've
started by closing down the return valve completely, then unwinding by
2 complete turns.

Andrew

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