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The motorized diverter valve (Danfoss) on the central heating/hot water system is leaking. Apparently it's a common fault and the whole thing needs replacing. It looks straightforward to replace, a few wires into a junction box and 3 x 22mm compression fittings. My question - how much of the system do I need to drain? There's a drain on the 3 way fitting under the valve, if I tie up the ballcock on the tank, can I drain the cistern from this and leave the central heating alone?
bump!
Should be ok, just loosen the fittings and waggle the pipe to make sure you are ok.
+1
rather than tie up the ball valve you could just isolate the mains supply at the service valve that [i]ought[/i] to be in the pipe work just before it goes in to the cistern.
While your'e up there you might want to give the ball valve a quick check and maybe a clean as they very rarely open on the CH circuit.
Thanks gentlemen, I knew I'd get the answer on here!
don't drain anything. just isolate the water supply, and you can get a rubber bung kit from most wholesalers, or bnq, that cause the system to vacuum.
easy!!!!!
Haven't got round to doing this yet, although I've got a new valve. Are you chaps sure that the central heating system doesn't require draining? Someone I was talking to yesterday said that it should be ....
it needs draining or you will get wet, everything above the valve needs emptying
read your own post... the diverter valve on the ch/dhw system is leaking
if you have three 22mm compression fittings that means you have three water sources.. boiler.. dhw and ch.. drain the lot and still expect to have some water come out.
if your lucky and there is movement you might be bale to just undo and pull apart if its a close fit with no pipemovement you may be faced with pipework as well..
some jobs look easy and are..
some jobs look very easy and are awful..
TFM - everything above the valve - the central heating's not above it, is it? The valve's in the airing cupboard with the cylinder.
they're all connected, the valve you're changing doesn't have any hot water as such passing through it, it's all system water. you're not draining the hot water tank, you're draining the system water
draining is the easiest part of the job. just connect a house to one of the ground floor rads. when it's empty, wiggle the manual lever on the valve in case any is trapped.