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How to drain a Saunier DUVAL boiler and CH system?

How do i drain down a Saunier Duval central heating system? Also how do i refill it? What "chemicals" must i add?

The reason i ask is i suspect there may be sludge in the pipework/radiators and i wish to flush these out.

Any help will be greatly appreciated.
Nazir Letap, November 2008
Drain it using several hand grenades obviously from a distance and refill it with unleaded after the dust has settled and light it up using yet another hand grenade.
should also eliminate any sludge problems

iain, November 2008
Just to add, its a combi boiler, the F30

Nazir Letap, November 2008
link Click here to see other fixes for Saunier Duval.