Hi,
I need to replace a couple of radiator valves and want to check on the steps I need to do for draining and refilling the system. I've done a bit of research but want to double-check.
On my lowest placed rad (towel rail style if relevant) which is also installed as a 'stub' off the main system (apologies if the terminology isn't correct), the valves are leaking (lock shield type). I've checked the faq/ wiki and other sources and unfortunately it's not any of the nuts that are leaking. The leaks are coming out of the 'adjuster' thread so I've bought new valves which I need to fit. If relevant I have a valliant ecottec plus 831 combi.
So, to fit I:
1) turn off CH (although not timed to come on) by turning dial right down
2) isolate the ch system but turning off @ the CH flow and return pipes
3) I have a drain cock attached to the CH flow pipe before it hits any rads. I intend to drain off here although there is also a valve on the CH return. Is the CH flow drain cock the right one and the water 'reverse' through the system by gravity as this is the lowest point of the system?
4) once system drained, fit new valves
5) refill system. I have a feeder pipe from the CW mains fill to the CH flow so I assume just open both these up. Is the system full when water comes out of the highest/ lowest rad bleed valve?
And that's it? I don't need to re-pressurise the boiler do I as I isolated it?
Thanks
I need to replace a couple of radiator valves and want to check on the steps I need to do for draining and refilling the system. I've done a bit of research but want to double-check.
On my lowest placed rad (towel rail style if relevant) which is also installed as a 'stub' off the main system (apologies if the terminology isn't correct), the valves are leaking (lock shield type). I've checked the faq/ wiki and other sources and unfortunately it's not any of the nuts that are leaking. The leaks are coming out of the 'adjuster' thread so I've bought new valves which I need to fit. If relevant I have a valliant ecottec plus 831 combi.
So, to fit I:
1) turn off CH (although not timed to come on) by turning dial right down
2) isolate the ch system but turning off @ the CH flow and return pipes
3) I have a drain cock attached to the CH flow pipe before it hits any rads. I intend to drain off here although there is also a valve on the CH return. Is the CH flow drain cock the right one and the water 'reverse' through the system by gravity as this is the lowest point of the system?
4) once system drained, fit new valves
5) refill system. I have a feeder pipe from the CW mains fill to the CH flow so I assume just open both these up. Is the system full when water comes out of the highest/ lowest rad bleed valve?
And that's it? I don't need to re-pressurise the boiler do I as I isolated it?
Thanks