In this part it will be explained how to combine and configure the various subsystems of which the REG System is made up, in order to manage mixed circuits in boilers rooms.
Of course, the same subsystem described so far (Zones, Circuits, Timetables, Sources, etc.) will be used, but they will be combined in a slightly different way to that usually used to manage radiant systems.
Example: managing a boiler room made up with a single mixed circuit.
To summarize, suppose we need to control:
A mixed circuit, with three-point mixing valve and pump;
Manage the water outlet temperature with climatic curve on two levels (comfort/economy);
Activate the water pump at set times;
Activate a boiler at times when the circuit is switched on.
As you can see, it is a simple but realistic example, as found, for example, in block of flats with radiators and a traditional (non-condensing) boiler.
We will configure the REG System in this way:
The subsystems share tasks in the management of the circuit, in particular:
The Zone subsystem, together with the Timetable subsystem, determines when to activate the circuit;
The Circuit subsystem determines, when activated, how to control the circuit.
It should be noted that in this type of configuration the Zone subsystem is configured differently to how it is configured for radiant system control: a zone room sensor is not configured.
Once it is understood that for each circuit to be managed we must use a timetable + a zone + a circuit, it becomes immediate to extend this structure to larger system; suppose we must manage a system with three circuits, two of which are mixed and one is direct; by extending the previous example, the structure to be used becomes:
PHOTO TBD
What we see it is the most general case, in which each circuit has independent times.
Of course, if the operating times are the same, it is possible to “recycle” the same timetable and the same zone, while keeping the circuits independent to allow independent adjustments.
In this way, the user will have to set just one timetable, but they will be able to set different climate curves and still obtain independent adjustment on the two circuits.
Note
The example below could apply to a building with two distribution circuits serving different zones with different geographical exposure, one facing north and the other south.
