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Tbh as for draining it, mains off, open prv on combi valve and make sure it terminates correctly and doesn't back up to the tundish.
every time ive replaced a valve ive had the vacuum break letting the contents of the cylinder spill out.
ash how close is it to me and when are you going?
you can meet my short aris'd self 🙂
Haven't read the full thread but if youre struggling to isolate anything why not just stick a lever valve at the base of cylinder
It's in Detling Killy.
I'm not sure when I'll be doing it yet as I have to work around her and as everything is working ok she's not desperate for it to be done. She said anytime over the next 2 weeks will do as she is going away for a week then. I'm hoping to order the part tomorrow or Monday and get it done early next week - all depending on finishing work at a decent hour.
If it's a megaflow :- defo bubble gone! I wouldn't even order parts !
Doc - drain off chopper
Really if the bubble has gone when cylinder is hot DHW got no place to expand to so the vale (correct name , expansion relief valve) opens and drops. It's a common fault. Google - recharge air bubble on megaflow .
Thats why the other guy gave them a rubber ear. It will be a pita to drain. Easiest way is screw on one of those self cutting washing machine valves then you can run a hose. You need your unvented ticket to work on this. Btw it is probably not the expansion valve that is at fault. Look elsewhere for the problem. I should read the whole thing before posting. Most likely needs recharging or pressure reducerNo drain off between the component and cylinder.
I'll pop along and help out.
ash have you checked if the relief pipe is running outside?
is the leak coming from the valve body or from the compression to the relief pipe?
Thats why the other guy gave them a rubber ear. It will be a pita to drain. Easiest way is screw on one of those self cutting washing machine valves then you can run a hose. You need your unvented ticket to work on this. Btw it is probably not the expansion valve that is at fault. Look elsewhere for the problem. I should read the whole thing before posting. Most likely needs recharging or pressure reducer
Aye but it would run out the tpr valve when it heats too. First thing to check on a megaflow. They need recharging every 3 - 6 months (sometimes longer) and no one ever does it. Also if the pressure reducing valve isn't working properly and the incoming pressure is high it will pass. Very rare for an expansion valve to pass (well it is up this way but we have decent water thats not full of rubbish) as there are no impurities in the water to jamb it open (it should never lift in the first place).
