Recently cleaned and refilled my central heating using a new method suggested to me by a gas engineer friend partly inspired by something someone suggested on here some time ago. Basically always get air in the microbore system so tried this. Seems to have worked well as all is fine now. Wondered what pros opinions are on this.
System details:
Open vented y plan system with combined feed/ vent with air seperator.
Potterton Suprima 30 non condensing boiler – 17 years old
3 bed house with 7 small rads – 10mm microbore – downstairs rads are drop fed and each has a doc.
What we did:
Add cleaner to isolated bathroom rad after syphoning off 1 litre of h20 – circulated as per instructions with all valves fully open for full duration advised.
Drain/flush method:
Clean F/E tank thoroughly – remove all crud to prevent it entering the system, isolate boiler, wire Grundfoss pump to mains (protected by 3 amp fuse) and run on 2, manually open 3 port valve.
Open one of the drain off cocks and allow water to run at same rate as water is replacing in f/e tank until clear. Reinstate all,turn on system to heat up and repeat above several times
As I say above was easy and no air locks but wondered whether we should have drained from each DOC downstairs instead of just 1- my mate said the pump was circulating the water so just 1 was fine. Also wondered if pump should have been on 3 whilst we did this it is normally on 2 but was on 3 whilst the circulated.
Interested to know peoples opinions on this.
System details:
Open vented y plan system with combined feed/ vent with air seperator.
Potterton Suprima 30 non condensing boiler – 17 years old
3 bed house with 7 small rads – 10mm microbore – downstairs rads are drop fed and each has a doc.
What we did:
Add cleaner to isolated bathroom rad after syphoning off 1 litre of h20 – circulated as per instructions with all valves fully open for full duration advised.
Drain/flush method:
Clean F/E tank thoroughly – remove all crud to prevent it entering the system, isolate boiler, wire Grundfoss pump to mains (protected by 3 amp fuse) and run on 2, manually open 3 port valve.
Open one of the drain off cocks and allow water to run at same rate as water is replacing in f/e tank until clear. Reinstate all,turn on system to heat up and repeat above several times
As I say above was easy and no air locks but wondered whether we should have drained from each DOC downstairs instead of just 1- my mate said the pump was circulating the water so just 1 was fine. Also wondered if pump should have been on 3 whilst we did this it is normally on 2 but was on 3 whilst the circulated.
Interested to know peoples opinions on this.
