Circulating pump is pumping over to expansion tank

[Fredbloggy]

Hi
I have a problem with pumping over. The pump is sited on the return just before the boiler and both are sited across the garden in a store. The cold feed is before the pump in the return - 15M before the pump. The expansion pipe is in the flow situated as the pipe work comes into the house and before the zone valve posistions (3 of on "Y" plan). It is extremely hard to alter the pipe work and the expansion pipe runs across the apex of the loft (bungalow). It would be easiest to change the expansion pipe so it was in the return 5M before the pump. This would give - cold water feed - 10M - Expansion Pipe - 5M - Pump/Boiler. Any problems with this? I know its not ideal but could the pump just be reversed so that the hot water comes out of the return of the boiler? Thanks

 

[DP]

You cannot have feed or vent pipe with 'fitting' between the tees for same and the boiler. In other words, a pump, a motorised valve or any other valve that introduces resistance, cannot be located between vent tee/ feed tee and the boiler.

When the boiler boils over due to fault condition, the vent must discharge without any impedence. Same goes for feed pipe- after discharge feed brings water to the boiler. Slow that down or even stop it, you have a good chance of killing the boiler.

Think of relocating the pump and the motorised valves after the vent and feed connections

 

[Fredbloggy]

Click on the link to see a sketch of the pipe layout and what I would really like to do if it would cure the problem.

The pipe work is tight in the airing cupboard and because there are three zone valves it is very hard to alter the pipework. The boiler is also 20 metres away in an outhouse.
thanks
fred

Untitled

• Fredbloggy
• 24 Oct 2012
• 1