Hi,
I am planning on draining and refilling my sealed CH system at the weekend to reconfigure some pipes and rads, and add a drain cock. It’s a large system with 20 rads!
I have isolating valves (that do work) between my ground and first floor (where the boiler is).
First question – should I isolate the lower half of the system and just drain that? Should I top up with inhibitor? Does it matter what make/type is already in there? Or should I drain the entire system?
Second question – when refilling – all the advice I have read say to close all bleed valves then connect/open the filling loop – then bleed the rads once mostly full. Should I actually leave the highest radiators bleed valve open with an assistant watching for water? Otherwise – the air will just become more and more compressed and I’ll be working against it? It seems the volume of air in the radiator/system is way above the capacity of the boilers expansion vessel.
Cheers – look forwards to hearing what your views are.
I am planning on draining and refilling my sealed CH system at the weekend to reconfigure some pipes and rads, and add a drain cock. It’s a large system with 20 rads!
I have isolating valves (that do work) between my ground and first floor (where the boiler is).
First question – should I isolate the lower half of the system and just drain that? Should I top up with inhibitor? Does it matter what make/type is already in there? Or should I drain the entire system?
Second question – when refilling – all the advice I have read say to close all bleed valves then connect/open the filling loop – then bleed the rads once mostly full. Should I actually leave the highest radiators bleed valve open with an assistant watching for water? Otherwise – the air will just become more and more compressed and I’ll be working against it? It seems the volume of air in the radiator/system is way above the capacity of the boilers expansion vessel.
Cheers – look forwards to hearing what your views are.