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Post by tomplum on Oct 16, 2019 15:44:59 GMT
worth a try mate,  |
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Post by Deleted on Oct 30, 2019 13:42:28 GMT
Right so I have got the system working kind of.
The diverter head (zone valve) was not turning so I replaced that and now I have hot water and heating.
Problem is that I still have the blockage so it is not filling up from the fill pipe.
Can I try to blast the blockage back up the filler by putting mains on the expansion pipe? I can close the gate valve on the pump so the water does not go through there. Not sure if this might push water backwards through the boiler though.
I don't really want the blockage to go into the system. Unless I just blast it, then use sludge remover, then flush in a few weeks.
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Post by rocketmanbkk on Oct 30, 2019 17:39:04 GMT
Can’t you cut it out & replace it?
If your not confident use the cut out portion as a template & allow for it to fit back with fitting.
How are you going to blast it?
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Post by Deleted on Oct 30, 2019 20:03:23 GMT
I think it is under the bathroom floor and I am reluctant to lift the floor.
I was going to force mains pressure down the expansion pipe which should leave the feed as the only place for the pressure to go. Hopefully that will blast out the blockage.
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Post by rocketmanbkk on Oct 30, 2019 21:02:16 GMT
I think it is under the bathroom floor and I am reluctant to lift the floor. I was going to force mains pressure down the expansion pipe which should leave the feed as the only place for the pressure to go. Hopefully that will blast out the blockage.  .... |
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Post by tomplum on Oct 31, 2019 9:02:31 GMT
hi diy, in my experiance the blockage is in the cold feed at the first tee, this is because the water at that junction is 'still', So pressurizing at the expansion will fill the system and leave the block where it is Attachment Deleted |
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Post by tomplum on Oct 31, 2019 9:16:36 GMT
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Post by Deleted on Oct 31, 2019 11:35:12 GMT
Right that makes sense however I though the feed and expansion are on the same side (both on flow, or both on return).
I did have some water fill through the filler but very slowly and it would only fill the downstairs rads.
I think there is a bit of water coming through, so if I blast like your drawing, once the system is full, the pressure should build and the only place it can go is up the filler, hopefully taking the blockage with it.
That is what I thought would happen. Is that right?
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Post by tomplum on Oct 31, 2019 12:51:52 GMT
yes, its all one big circuit, all roads lead to Rome, it will fill it,
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Post by Deleted on Nov 1, 2019 9:22:25 GMT
Brilliant.
Just had another thought, the feed and expansion pipes in the loft are very long. They travel across the loft, then go down the vertical stack before joining into the loop under the floor somewhere.
Question: Does it matter if I combine the feed and expansion up in the loft, just before it goes down the vertical stack or does it need to be as close to the main loop as possible?
It would mean that about 4 meters of pipe would be the feed and expansion before it enters the main loop.
Would that work or is it not a good idea?
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Post by tomplum on Nov 1, 2019 12:33:41 GMT
yes you could link them up in the attic keep in mind that the cold feed has to fall all the way to the tee you're going to put into the expansion pipe then blank the existing cold feed off, have a compression blank handy when you cut it, It will be full of water and the tank might have some in as well, so be ready for that,  |
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