I currently have a Y-Plan heating system. The pump and 3-port valve are both in the airing cuboard with the 3-port valve sitting more or less on top of the pump. The outlets from the 3-port valve - one to the coil in the cylinder and the other to the radiators - are horizontal, and are level with the top indirect coil connection, about half way up the cylinder.
The 3-port valve is showing its age and will soon need replacing. I would like to convert to an S-Plan system by replacing the 3-port valve with two
2-port valves plus an automatic by-pass. I would also like to insert some full-bore lever valves to make it easy to isolate each component for maintenance.I cannot do this without changing the layout somewhat. There is not enough horizontal pipe either side of the 3-port valve (to be repaced by a tee) to insert 2-port valves. So I would like to extend the pipework by a foot or so above the current level, tee to 2 horizontal branches, and then come down again vertically with a 2-port valve in each vertical drop. I would, of course, put a vent pipe with bleed screw at the hightest point.
Can anyone see any problems with this?
TIA.