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SDC / DHC Hydraulic Components
EN2H-0221GE51 R0808 233
7.3.12.2 Function of the cascade parameters
Each heat generator has its own switching differential. The
cascade switching differential must be set in such a way that it is
always larger than the switching differential of any individual heat
generator.
The afterheating characteristics of the boilers used must be taken
into account when rating the heating system. The cascade switch-
on delay is used to adjust the system to the start-up delays of the
individual boilers. When does the heat generator deliver its
energy into the system after being switched on (start-up phase,
pre-running time)? The appropriate setting is the maximum delay
time of the boilers in the system.
To prevent all heat generators switching off simultaneously if the
set cascade switching differential is exceeded, the run-down of
heat generators is controlled by the switch-off delay. The setting
has to be adjusted to the afterheating characteristics of the heat
generators.
To ensure the balanced utilisation of the heat generators within a
cascade, a runtime-dependent leading stage swap can be
activated.
After the set operating time of the presently leading heat
generator has passed, the system switches to the heat generator
with the next higher bus address.
Stage swap can only be executed between several central
devices. It cannot be applied if several condensing boilers are
switched by a single central device.
The leading cascade stage can still be set manually to any
existing stage even when automatic stage-sequence switching is
disabled.
Changing the heat generator type within the central device at
address 10 leads to an automatic reset of the leading stage to the
first heat generator.
Switching differentia
l
Connection delay
Deactivation delay
Stage reversal
Guidance stage
NOTE