Refilling system - Greenstar 4000

[bluto32]

I have a Greenstar 4000 30KW combi boiler, and am planning to partially drain down the system to move a radiator. There is a blue lever ("keyless filling link") underneath for gradually topping up the pressure after bleeding a radiator, but I suspect this would be a very slow way to refill the system after a partial drain down. What is the usual refill procedure on this model?

 

[fowlerboi]

You use that filling link.

 

[bluto32]

You use that filling link.

Thanks for replying. So is that how a system is filled initially with this type of boiler - just by holding the lever down as long as necessary?

I've attached a photo taken from underneath the boiler showing the blue lever on the cold mains feed. Out of interest, what is the purpose of the threaded spout hanging down in the black section linking the cold mains feed to the central heating circuit?

 

[ShaunCorbs]

Correct it’s the nrv air gap so might drip a dip or two when filling