DB1 - The 2 circuits operate completely independently.
The collective circuit is managed by a centralized building system.
The individual circuit is controlled by the device's thermostat.
DB3 - The collective circuit is started by the triggering of the individual circuit.
When the individual circuit operates, at the request of its thermostat, it causes the collective circuit to operate.
DB4 - The collective circuit is started by its integrated thermostat or by the operation of the individual circuit.
When the individual circuit operates, at the request of its thermostat, it causes the collective circuit to operate.
When the individual circuit is stopped, the collective circuit operates autonomously with its integrated electronic thermostat and factory preset (generally at 12 ° C).