Umbongo said:Well I've produced a diagram using Word but I can't download it into the post. As far as I can see the flow is:
Boiler => Pump => Hot Water Cylinder => Return pipe =>Boiler
....................... => Valve => Radiators => Return pipe => Boiler
After the pump there's a 3-way junction but HW is never turned off unless cylinder thermo operates. Room thermo operates to open the valve to the radiator circuit.
email it to me then click on my profile