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how do i drain down a sealed system?

I want to put a radiator in the conservatory but it is a sealed system and i need to drain down before i connect up, how is this done.the boiler is a glow worm micron 30ff
martyn graves, November 2007
Treat it the same as a more traditional system. There will be a drain off cock somewhere on the system unless it was installed by a plank.

Jim, November 2007