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Post by Deleted on Aug 1, 2018 7:40:58 GMT
Might be an air lock somewhere I reckon. Or possibly you need a bigger pump. Good tips! Like being back of fuckin analworld.
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Post by Deleted on Aug 1, 2018 7:46:26 GMT
have you tried adding a de-shitting agent to it ? If it is scaled up maybe that could be broken down and would improve circulation.
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Post by Telemachus on Aug 1, 2018 8:08:07 GMT
It’s like being back on CWDF with people asking questions and then when they get the answer they don’t like, get all sulky and fingers in ears going “blah blah blah, I’m not listening,”
Perhaps YOU could explain how a radiator can have lighter hot water at the bottom, and heavier cold water at the top?
Oh is you boat in space with no gravity? That would explain it.
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Post by Deleted on Aug 1, 2018 8:18:55 GMT
Might be an air lock somewhere I reckon. Or possibly you need a bigger pump. Good tips! Like being back of fuckin analworld. <iframe width="24.75999999999999" height="6.259999999999991" style="position: absolute; width: 24.75999999999999px; height: 6.259999999999991px; z-index: -9999; border-style: none;left: 15px; top: -5px;" id="MoatPxIOPT0_70678287" scrolling="no"></iframe> <iframe width="24.75999999999999" height="6.259999999999991" style="position: absolute; width: 24.76px; height: 6.26px; z-index: -9999; border-style: none; left: 1177px; top: -5px;" id="MoatPxIOPT0_60578736" scrolling="no"></iframe> <iframe width="24.75999999999999" height="6.259999999999991" style="position: absolute; width: 24.76px; height: 6.26px; z-index: -9999; border-style: none; left: 15px; top: 250px;" id="MoatPxIOPT0_12805440" scrolling="no"></iframe> <iframe width="24.75999999999999" height="6.259999999999991" style="position: absolute; width: 24.76px; height: 6.26px; z-index: -9999; border-style: none; left: 1177px; top: 250px;" id="MoatPxIOPT0_11877734" scrolling="no"></iframe> In my view, it will be the pump. How many rads are you running, and what size? I've done a few with similar issues.
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Post by Deleted on Aug 1, 2018 8:21:06 GMT
Maybe the pump is trying to push against a natural thermo syphon effect.
This is why it would be useful to know if the system had ever worked properly. If not then maybe it is the wrong way round.
Also worth knowing pipe size for primary circulation circuit.
It seems most likely to be the pump and as the previous owner of my alde specifically replaced the original pump with a Bolin (on a system which only has two small radiators and a calorofier) it seems likely that the original pumps are sometimes a bit naff. They do look naff.
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Post by Deleted on Aug 1, 2018 8:22:53 GMT
It’s like being back on CWDF with people asking questions and then when they get the answer they don’t like, get all sulky and fingers in ears going “blah blah blah, I’m not listening,” Perhaps YOU could explain how a radiator can have lighter hot water at the bottom, and heavier cold water at the top? Oh is you boat in space with no gravity? That would explain it. FFS how many times though do i have to say there is no air in the rad for you to understand, no air in the rad! Opening the bleed valve brings water out, not air. You are missing the point completely so once again i will repeat it, the top of the rad does get hot, but it takes a long time, at least two hours, the question was then if i fit a scond more powewrful than the silly little thing in the top of the boiler, will it circulate hot water to the top of the rad quicker. If you cant answer this Nick, then its ok to say so and move on.
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Post by ched on Aug 1, 2018 8:25:04 GMT
Hiya mate, sorry if this is stating the obvious - just trying to help. Have you got the antifreeze in the system and the right mix/consistency of this? From my limited understanding (no expert by a long shot), the previous poster might be right in that the pump doesn't really do a lot - the system relies on conduction/thermosyphic flow and I think the right mix of the antifreeze is critical to this. We have the same boiler located at the stern and a radiator right up front at the bow (57ft nb) - this rad does take longer to heat but it does eventually get hot with no cold spots.
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Post by Deleted on Aug 1, 2018 8:25:05 GMT
froggy
Have you bled the radiators ?
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Post by Deleted on Aug 1, 2018 8:29:26 GMT
froggy Have you bled the radiators ? Good name...
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Post by ched on Aug 1, 2018 8:38:52 GMT
I saw your post to nick and understand your question better now. I've never used him, but why not ring this guy for a chat, seems to know his shit on this subject: www.grahamcutmoreengineering.co.uk
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Post by Deleted on Aug 1, 2018 8:50:05 GMT
Maybe the pump is trying to push against a natural thermo syphon effect. This is why it would be useful to know if the system had ever worked properly. If not then maybe it is the wrong way round. Also worth knowing pipe size for primary circulation circuit. It seems most likely to be the pump and as the previous owner of my alde specifically replaced the original pump with a Bolin (on a system which only has two small radiators and a calorofier) it seems likely that the original pumps are sometimes a bit naff. They do look naff. A good point, the system never really worked well before, 15 years old, so i gutted it and replaced all rads, went from 3 large and 2 small to 4 large, most pipework was also replaced where i could get to it, only leaving bit i couldn't get to. After all the replacing of pipes and rads, twice emptying the system and replacing water and bleeding, its acting the same. The one thing i have not done yet is add any anti freeze, purely because i do not want to have to drain down again if the pump needs fitting. The water runs from the boiler up the left hand side of the boat passing through two rads that heat ok, around the bow then back down through another two rads which take a long time to heat up fully.
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Post by Deleted on Aug 1, 2018 8:51:22 GMT
I saw your post to nick and understand your question better now. I've never used him, but why not ring this guy for a chat, seems to know his shit on this subject: www.grahamcutmoreengineering.co.ukCheers, i have used him, or the fella who took over from Graham, actually have his mobile numbers still.
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Post by Telemachus on Aug 1, 2018 9:00:42 GMT
It’s like being back on CWDF with people asking questions and then when they get the answer they don’t like, get all sulky and fingers in ears going “blah blah blah, I’m not listening,” Perhaps YOU could explain how a radiator can have lighter hot water at the bottom, and heavier cold water at the top? Oh is you boat in space with no gravity? That would explain it. FFS how many times though do i have to say there is no air in the rad for you to understand, no air in the rad! Opening the bleed valve brings water out, not air. You are missing the point completely so once again i will repeat it, the top of the rad does get hot, but it takes a long time, at least two hours, the question was then if i fit a scond more powewrful than the silly little thing in the top of the boiler, will it circulate hot water to the top of the rad quicker. If you cant answer this Nick, then its ok to say so and move on. Have you tried my suggestion of shutting off all the other radiators and ensuring the lockshield on the problem one is wide open? And you didn’t answer my question about whether there are TRVs fitted? Of course you could just go to the trouble of installing a bigger pump, but I am trying to help you avoid that if it is unnecessary. But I get the impression you just want to install a new pump, so go ahead.
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Post by Deleted on Aug 1, 2018 9:06:07 GMT
TRV's are fitted to the incoming side, lock shields on out side.
Yes have shut all TRV's on all other rads and the lockshields are all fully open, still the same.
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Post by Telemachus on Aug 1, 2018 9:35:48 GMT
TRV's are fitted to the incoming side, lock shields on out side. Yes have shut all TRV's on all other rads and the lockshields are all fully open, still the same. TRVs are fairly restrictive even when open. And they can stick/gunge up. Are they new? i would remove the TRV on the end rad and replace it with a normal valve.
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