on the honeywell two port motorised valve, on the brass body of the valve its self should the arrow face the direction of the water flow. on the pump side of the system the arrow is facing the the flow arround the system and I want to fit a valve on the return back to the boiler. on the hot water side the valve is facing towards the cylinder at the top entrance to the coil. I want to convert the system to a plan s. I have got a wiring dgm. its just the valve that i need to install.