plumbbob wrote:Pipe diameters are wrong and what are all the service valves for???
plumbbob wrote:I am not surprised it is pulling in air because the two connections to the expansion tank are wrongly on different sides of the pump.
Atticus Finch wrote:Having the vent and feed on opposite sides of the boiler was fairly normal with cast iron HE's as the pressure drop through the boiler was negligible.
Atticus Finch wrote:As well as moving the feed pipe connection, a second motorized valve is required in the HW circuit and a cylinder stat. In addition a new programmer is probably required so you have independent control of CH/HW times and temperatures. I have shown the changes in this diagram. And get rid of the plastic pipes/joints.
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