I would be grateful for some advice regarding the installation of a non-return valve (NRV).
I have a thermal store (TS) with three coils and which is essentially being used as a buffer tank (boiler is wood pellet fired) in that one coil is used for the boiler flow, the second is used for the C/H and the third is for input from the solar thermal system i.e. all indirect. This setup is working pretty well except that I have a problem with thermosyphoning. When the C/H is off, C/H pipework (on the flow side) is wicking heat away from the TS. The C/H pump is in the return pipe but I need to put a spring NRV in the flow to stop the thermosyphoning.
Two questions: (a) can I put the NRV in a horizontal part of the C/H flow pipe (the vertical pipework is inaccessible) and (b) do I have to move the C/H pump from the return pipe into the flow pipe?
I have a thermal store (TS) with three coils and which is essentially being used as a buffer tank (boiler is wood pellet fired) in that one coil is used for the boiler flow, the second is used for the C/H and the third is for input from the solar thermal system i.e. all indirect. This setup is working pretty well except that I have a problem with thermosyphoning. When the C/H is off, C/H pipework (on the flow side) is wicking heat away from the TS. The C/H pump is in the return pipe but I need to put a spring NRV in the flow to stop the thermosyphoning.
Two questions: (a) can I put the NRV in a horizontal part of the C/H flow pipe (the vertical pipework is inaccessible) and (b) do I have to move the C/H pump from the return pipe into the flow pipe?