Worcester Greenstar 30cdi, adding rads

12 Jan 2008
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United Kingdom
:confused: I have a Worcester Greenstar 30cdi Combi boiler, and want to add 2 radiators, obviously I need to drain the system, that's no problem.
But I've looked at other Topics re' filling Combi systems & they all refer to a 'filling loop', to refill the system, my system hasn't got one, how do I refill the system after installing the rads? Or is it automatic, with this model of boiler?

:) One is new rad old location, other is new rad new location, branching off the existing flow & return........
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Loops may be integral to the boiler...look underneath. You need a white filling key.
The boiler has a hole into which a large round key is inserted and then turn the small tap underneath - which allows the flow of mains (filling) water to be directed into the boiler and this pressurises it. Aim for around 1.5Bar or around the middle of the gauge and then turn off the small tap. Once finished remove the key having a small tub underneath to catch any small drips. The pressure should remain staeady and not go down as long as there is not any air in system. Once the rad wok is complete you probably need to add more pressure and then bleed the rads, again topping up with more water.
Good Luck

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