Since i installed evohome on an old system were only two thermostatic rad valves were fitted the system can get a bit noisy when all HR92,s have closed, so i think an Automatic bypass Valve could be the answer. In the immersion cupboard were most of the pipework pump and motorized valves are it is easy to install the bypass for its incoming/flow side, its a 22mm pipe but there is no 22mm return pipe. The only return pipe is from the vented indirect cylinder and its 15mm this pipe drops down to a space under the immersion cupboard then heads off under a bedroom floor were it must either connect to its own 22mm return pipe or feed into the Radiator 22mm return pipe. Being that this pipework is under a chipboard floor which has been overlayed with laminate flooring getting at this pipework is not an option.
So the flow from the bypass will eventually have to be reduced from 22mm to run into the 15mm return at some point, is that OK. I also have an idea of maybe sending any output from the bypass to the hot water input on the Hot water cylinder this is fed from a 15mm pipe which is controlled by the DHW motorized valve i think would be less wasteful. If the DHW motorized valve is turned off (no demand) then any flow from the bypass cant back feed past the closed motorized valve and will flow through the cylinder coil and out through its 15mm return pipe, were if I don't do it this way the output from the bypass would end up anyway.
How does this idea sound to you.
So the flow from the bypass will eventually have to be reduced from 22mm to run into the 15mm return at some point, is that OK. I also have an idea of maybe sending any output from the bypass to the hot water input on the Hot water cylinder this is fed from a 15mm pipe which is controlled by the DHW motorized valve i think would be less wasteful. If the DHW motorized valve is turned off (no demand) then any flow from the bypass cant back feed past the closed motorized valve and will flow through the cylinder coil and out through its 15mm return pipe, were if I don't do it this way the output from the bypass would end up anyway.
How does this idea sound to you.
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