We have just spent a small fortune having two replacement pumps fitted to the central heating system (one above the boiler and one next to the hot water cylinder) and having the system pressure cleaned. Now we are back in the heating season we find that every time the heating fires up (not the hot water on its own) then the overflow from the feed & expansion tank gushes until a radiator is bled (which can take up to 10 minutes). Our latest plumber says this is an inherent fault in the system, drawing in air due to the negative presuure at the tank, and the only real solution is to reconfigure the pipework with a single pump. True or false? Is there any other way of improving the situation, by installing self bleeding valves say?
two pump systems
- Thread starter rayboy
- Start date
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My view, for what it's worth is that if the system is configured in the same way it was before he pumps were replaced, and that it worked ok then, is that IT DOES NOT NEED THE PIPEWORK RE_CONFIGURING. It may not be ideal in various plumbers opinions, but if it worked then it should work now.
What are the pump speeds set to? They are usually 3 speed, and setting them to a lower speed may help. You MAY (and only "may") benefit from a non-return valve or two but I can't tell unless I see your system. Two pump systems are ok and it is not necessary to chuck one out and substitute a valve.
Self bleeding valves have their place but I think you have a more fundamental probem to sort first.
Can you somehow generate a sketch in jpg format of your system pipework and post it somewhere on this forum? (I haven't a clue how you would post it
)
What are the pump speeds set to? They are usually 3 speed, and setting them to a lower speed may help. You MAY (and only "may") benefit from a non-return valve or two but I can't tell unless I see your system. Two pump systems are ok and it is not necessary to chuck one out and substitute a valve.
Self bleeding valves have their place but I think you have a more fundamental probem to sort first.
Can you somehow generate a sketch in jpg format of your system pipework and post it somewhere on this forum? (I haven't a clue how you would post it
)DIYnot Local
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