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Hydraulic Components SDC / DHC
222 EN2H-0221GE51 R0808
Note that bus addresses can only be issued once. Duplicated
addresses cause problems on the data bus.
7.3.11.2 Control functions via the data bus
7.3.11.2.1 Boiler start-up protection
If the selected heat generator operates with boiler start-up
protection, it signals the status of start-up protection to all the
corresponding heating circuits. They block the energy tapping
(pumps off, mixed heating circuit closed) for the period of the
start-up protection.
7.3.11.2.2 Indirect return increase
The heat generator in the base unit (addr. 10) transmits its current
boiler data, and each mixed heating circuit in the system can
carry out indirect boiler return increase.
7.3.11.2.3 Tank control mode (tank priority operation)
Each central device can carry out hot-water circuit loading. For
loading in priority operation, hot-water circuit loading that has
been started disables all other heating circuits and hot-water
circuit loading within the bus system. If tank loading occurs in
parallel operation, all heating circuits in the system remain active
and an additional hot-water circuit loading with set parallel
operation can be activated.
7.3.11.2.4 Heating circuit demand
Each heating circuit demand within the data bus system is
processed by the base unit (addr. 10). It takes on the greatest
demand and passes it on to the heat generators as a setpoint
value. A selected manual mode with manual temperature
specification also counts as demand.
7.3.11.2.5 Clock synchronisation
The time of day is sent to the entire system by the base unit
(addr. 10). There is a system time.