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I'm in the process of sorting out a CH system in my sister's house. She moved in recently and I'm going to move some radiators for her. To my horror I've found the expansion pipe has been cut just above where it was connected to the system and what appears to be an automatic air vent added in its place!
I've attached a PDF of the existing layout - looks like it was originally a gravity feed to cylinder then changed to a fully pumped system with two motorised valves. To my mind though it looks lethal and I'm surprised it even works at all.
Could someone please have a look at the PDF and advise how best to reconnect the expansion pipe, while retaining the two valves. I don't think simply reconnecting the expansion pipe in place of the air vent is the answer because with the HW valve closed the heating system would have no expansion point.
Would connecting the expansion between the HW valve and pump be better or does that risk pumping over the head? Would tee-ing in between pump and boiler be better?
Any suggestions or advice greatly appreciated!
I've attached a PDF of the existing layout - looks like it was originally a gravity feed to cylinder then changed to a fully pumped system with two motorised valves. To my mind though it looks lethal and I'm surprised it even works at all.
Could someone please have a look at the PDF and advise how best to reconnect the expansion pipe, while retaining the two valves. I don't think simply reconnecting the expansion pipe in place of the air vent is the answer because with the HW valve closed the heating system would have no expansion point.
Would connecting the expansion between the HW valve and pump be better or does that risk pumping over the head? Would tee-ing in between pump and boiler be better?
Any suggestions or advice greatly appreciated!