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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Clearing airlock from hot water cylinder - upto how much water neededto force through?
I'm trying to sort out a "no hot water" problem when boiler is set to
heat "hot water only, central heating off". Just get normal flows of cold water from all the hot water taps. The hot water flow pipe going into cylinder from boiler is very hot, the return pipe coming out of the cylinder to the boiler is luke warm where it exits cylinder. The cylinder itself (including top) feels cold everywhere. The boiler fires up but goes off after few minutes (say every 5 minutes). I can hear water swishing through the pump which is running. Its a conventional indirect system, Potterton Fuelsaver 65F boiler, cylinder on first floor, expansion tank in loft (which is full). I thought this was an airlock in the cylinder in the non-coil part of cylinder, so attached hose & forced water out through cylinder out of vent pipe, left it coming out for say 5 minutes & thought this would be enough time to clear any air. As this didnt fix problem,my question is how much water might need to be forced through hose,cylinder & out vent pipe to get rid of air lock. Might I need to replace the entire cylinder contents. I went onto think the problem is now in the coil boiler fed part of the cylinder but its hot going into the cylinder coil. Help... Steve |
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