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Post by Deleted on Jul 28, 2021 8:23:17 GMT
Hi all,new to the brew cabin and would like your knowledge on an issue I'm having.
My expansion tank is overflowing when central heating is on.
I have an open vented system with oil boiler,pump speed on 1 and pump is only 4 yrs old,new boiler stat fitted recently,new hot water cylinder stat fitted recently also and float valve in tank is also new.
Any ideas?
Thanks lads
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Post by dickpuller on Jul 28, 2021 9:25:05 GMT
There’s a fews things it could be mate;
Expansion pipe or feed pipe in the wrong place.
If your Header tank is higher than your F&E tank & there’s a perforated coil in the cylinder.
Faulty float valve.
Water level too high in the F&E tank, when the system water expands it overflows.
Etc etc etc
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Post by tomplum on Jul 28, 2021 10:36:43 GMT
Hello twincktoes welcome to the brew cabin, Dick's on the money there, So the float valve has been changed, Good, ok So the perforated coil in the cylinder is a possibility, this causes the heating water to mix with the domestic water and go in the lowest expansion tank. To check it, isolate the incoming water to the small heating expansion tank , then drain some water out, or ladel it out with a small jug/cup ,turn on the heating , If the water rises in the small tank then, its a perforated coil and you need a new cylinder,  |
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Post by Deleted on Jul 28, 2021 16:22:51 GMT
Hi dick,thanks for reply.
Expansion pipe and feed pipe are combined in attic,have been since house was built 20yrs ago. This issue is just recent.
Float valve is new.
Could it be sludge causing the problem?
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Post by Deleted on Jul 28, 2021 16:27:48 GMT
Hi tom,thanks for welcome.
If central heating water was mixing with domestic water wouldn't the water from hot taps be discoloured as radiators are 20yrs old.
I'll try your idea later on.
Just so you know,this forum is best one out there,no BS,tell it like it is.
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Post by crowsfoot on Jul 28, 2021 17:00:00 GMT
Hi Twinkle, The fact that you've had to have new stats fitted could well be a sign that heats not getting away from the boiler fast enough so it could well indeed be sludge.
Whats the water quality like in the expansion tank? Is it sludgy in the bottom of it?
Is there a gate valve on the cylinder primary return? If yes, open it up fully and see if that does anything.
As said above a perforated heat exchanger is the #1 cause of overflows from header tanks.
Tappy,
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Post by tomplum on Jul 28, 2021 18:22:49 GMT
hey twinkle thanks for the testiment, If it is the perforated coil, it would't discolour the water because, the domestic is above the heating and therefore the domestic water is being pushed into the heating circuit, If the heating tank was above the Domestic tank it might do but then, the domestic tank would overflow and not the heating,  |
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Post by Deleted on Jul 28, 2021 20:37:23 GMT
Hi Twinkle, The fact that you've had to have new stats fitted could well be a sign that heats not getting away from the boiler fast enough so it could well indeed be sludge. Whats the water quality like in the expansion tank? Is it sludgy in the bottom of it? Is there a gate valve on the cylinder primary return? If yes, open it up fully and see if that does anything. As said above a perforated heat exchanger is the #1 cause of overflows from header tanks. Tappy, Hi tappy, water quality has rust particles in expansion tank. Gate valve is on primary return and it is fully open. |
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Post by Deleted on Jul 28, 2021 20:40:12 GMT
hey twinkle thanks for the testiment, If it is the perforated coil, it would't discolour the water because, the domestic is above the heating and therefore the domestic water is being pushed into the heating circuit, If the heating tank was above the Domestic tank it might do but then, the domestic tank would overflow and not the heating, Ah I get ya now. You know a thing or 2 about plumbing 😄 well the hot water cylinder is same age as house so I think its served its time well. |
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Post by tomplum on Jul 28, 2021 20:53:51 GMT
Indeed I know a thing or two but, If I'm right and, it is the cylinder, it might be time to upgrade the whole system and think, combi or unvented or even heat pump/air pump, Don't forget, I'm old skool, a dinosaur in muddy ground and about to get swallowed up, chucking money in an old system is not wise and yours is an old system, 21 years of good value will not do another 21 years just by changing the cylinder, time to invest I think,  |
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Post by dickpuller on Jul 28, 2021 20:58:32 GMT
Hi dick,thanks for reply. Expansion pipe and feed pipe are combined in attic,have been since house was built 20yrs ago. This issue is just recent. Float valve is new. Could it be sludge causing the problem? Could well be sludge in the system causing problems. Check if it’s ‘pumping over’ from the expansion pipe over the F&E tank. Or if the water level in the F&E tank rises a lot when the CH is on. |
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Post by Deleted on Jul 29, 2021 0:21:05 GMT
Think I might just change the hot water cylinder for now and get powerflush. Possibly change old radiators.
Thanks for advice lads,always top notch
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Post by crowsfoot on Jul 29, 2021 16:32:49 GMT
Hi Twinkle, The fact that you've had to have new stats fitted could well be a sign that heats not getting away from the boiler fast enough so it could well indeed be sludge. Whats the water quality like in the expansion tank? Is it sludgy in the bottom of it? Is there a gate valve on the cylinder primary return? If yes, open it up fully and see if that does anything. As said above a perforated heat exchanger is the #1 cause of overflows from header tanks. Tappy, Hi tappy, water quality has rust particles in expansion tank. Gate valve is on primary return and it is fully open. If it was sludge I'd have expected that expansion tank water to be really dirty? On a combined feed and expansion I can't see that the pump can influence a pump over so you could give it a try by running it on top speed which could be enough to shift the sludge deposit if that's what it is. One more, if the pump was changed 4 years ago could the new pump have been fitted the wrong way round? Would it be worth throwing another new pump at it? |
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Post by crowsfoot on Jul 29, 2021 16:38:05 GMT
Sludge blockage at the "mother in laws"!
Tappy,
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Post by tomplum on Jul 29, 2021 16:56:07 GMT
Tappy ( crowsfoot) said, One more, if the pump was changed 4 years ago could the new pump have been fitted the wrong way round?, Thats good thinking , that could cause it as well,  |
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