Chatham wrote: it is useless to be able to heat 30 ° since the water must be at 60 ° mini to kill the legionella bacteria ...
It's been 25 years since the temperature of my balloon does not exceed 50 °. Is it not long since I should have died of legionellosis, especially since the water is not chlorinated? The bacteriological quality of the water has been checked several times (scouts camped on our land). Maybe the water renewals are fast enough to prevent these bacteria from growing?
Here is a first draft of my installation (under Dia)
Of course, in operation, the sensor valves are always open.
The safety valves and expansion vessels are only useful if the sensors are under pressure in summer (better efficiency). The valve of the manual bleeder and that of the coolant tank are then closed. They are open in "automatic drain" mode.
The circulator next to the chimney is optional, this circuit functioning in thermosyphon. For safety reasons, no valve isolates the recuperator from the chimney. The non-return valve prevents the sensors from heating the chimney. It requires a well-adapted and well-installed model to avoid the thermosiphon. Radiators (rarely used) are connected to the same circuit as the DHW. It would have been more logical to connect them to that of the pool, but it would have been too complicated given the configuration of the premises (the machine room begins to look like a submarine ...)
You were right, Christophe, Dia is a small precise and practical software, well in the logic of Ubuntu. Lacks the "flip" function and the possibility of moving the whole diagram when all the objects are grouped (must be copied and pasted on another file). But I haven't explored or understood everything yet. Too bad the user manual is not in French.