Warm F&E tank

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Hi All,
I had a few problems with my heating since I drained down and fitted an additional radiator. Pipes were already there for the rad. (previous owners had removed it to install a kitchen cabinet). The system is a conventional fully pumped open vented system.
Since it has been refilled I have had problems with the system making gurgling / trickling noises and pumping over, but not all the time only when the pump had just been switched off.

I had someone round to service the boiler and they suggested converting the system to a combined vent a feed (one 22mm pipe from the F&E tank).
I have done this and whilst I was there I cut out and replaced the 'H' section in case there was a blockage, they were clear anyway.

So now I have one pipe from the tank in the loft, the trickling noise has almost dissapeared, its taken about a week to remove all the air from the system, but now sounds much better.
However, now I get warm water in the F&E tank. Is this normal?
Also when the system is running the 22mm combined vent and feed gets warm up near the ceiling before it goes in to the tank. When the pump turns off the quickly turns to hot as hot water rises up the pipe to the tank. The level in the tank rises by a few mm when this happens too.

Does this sound like a problem or normal operation?

Many thanks in advance.

 

[diamondgas]

Ads you may have a a radiator or two with air in them. It may pay to go around and bleed your heating system to make sure it is full. What could be happening is that when the pump is on it's compressing the air and drawing cold water down the f&e pipe. When the pump goes off the air expands pushing now hot water up the f&e pipe.

Regards warm water to the ceiling. There is a small chance that convection is occuring in the single pipe and/or it's down to expansion... That's my thoughts anyhoo's 🙂

 

[fuzzy]

Hi All,
I had a few problems with my heating since I drained down and fitted an additional radiator. Pipes were already there for the rad. (previous owners had removed it to install a kitchen cabinet). The system is a conventional fully pumped open vented system.
Since it has been refilled I have had problems with the system making gurgling / trickling noises and pumping over, but not all the time only when the pump had just been switched off.

I had someone round to service the boiler and they suggested converting the system to a combined vent a feed (one 22mm pipe from the F&E tank).
I have done this and whilst I was there I cut out and replaced the 'H' section in case there was a blockage, they were clear anyway.

So now I have one pipe from the tank in the loft, the trickling noise has almost dissapeared, its taken about a week to remove all the air from the system, but now sounds much better.
However, now I get warm water in the F&E tank. Is this normal?
Also when the system is running the 22mm combined vent and feed gets warm up near the ceiling before it goes in to the tank. When the pump turns off the quickly turns to hot as hot water rises up the pipe to the tank. The level in the tank rises by a few mm when this happens too.

Does this sound like a problem or normal operation?

Many thanks in advance.

where is the pump in relation to feed and vent?

 

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The system has been bled several times in the last week since I changed it to a combined feed and vent. I bled again tonight and got a little air out of the magnaclean. I have attached a picture of what the layout looked like before I converted it to 22mm combined feed and vent. The 15mm feed (pipe on right) has been cut and now has a manual vent on to aid refilling. The 22mm vent (pipe on left)is now connected to the bottom of the F&E tank and acts as the feed and vent. I have also straightened the magnaclean up so it is vertical. The 'H' section is 800mm below the tank if that helps. Any suggestions as to how to fix appreciated.

 

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Any ideas anyone? I'd like to get this fixed so it doesn't cause me problems in the future. Or will it not cause me problems? I'm pulling my hair out trying to work this out. Help!

 

[diamondgas]

Hi Ads ... really doesn't sound like much of an issue to be honest ... 800mm is a pretty short f&e pipe so expect it to get warm. What setting is the pump on? If max try it on a lower setting see if that reduces the "trickling" noise and water displacement! What boiler do you have installed? Do you have an auto bi-pass fitted? Reducing the pump flow and/or fitting an auto bi-pass may well help reduce the noises etc you're experiencing 🙂

 

[fuzzy]

looks like a tradtional set up, dont see why you had to convert to combined, looks like the vent and feed are next to each other anyway

 

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Fuzzy, I converted to combined because it was pumping over and drawing in air when the pump was switched off. There was no option of extending the vent due to the roof height.
Diamond gas, I have a potterton promax 15SL boiler, no by-pass, that I know of anyway. The trickling noise has pretty much stopped, since i bled it a few more times. I was more worried about the F&E tank being warm and the pipe going to it getting hot, but I guess this is normal as heat rises! The tank never gets more than just warm. Would I be correct in this assumption, especially as the feed pipe is quite short.

Many thanks for the help.

 

[diamondgas]

Ads, honestly mate you have little to worry about. You've done all you can on an open system to prevent corrosion!

have a warm festive season 🙂

 

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Thanks diamondgas. Trouble with me is I'm a great beliver in prevention is better than a cure. Plus I do get told I'm too much of a perfectionist by my other half. 🙂 I guess I'll leave it as it is, and put it down to me worrying too much. Thanks everyone for the help and advise.