EbV
Product documentation THETA NORM/UNIT
10-2
Switch-over power
• The switch-over power set in the cascade level is only suitable for operating boiler
controls. Until the last burner stage has been started, all active burner stages up to
that moment are reduced to the set switch-over power (capacity limitation). After
the last burner stage is activated, all the others are enabled to perform at 100 %
capacity (full load).
• If all available stages are active, the boiler control does not have a capacity
limitation. If a stage is reduced, the set switch-over power is active for the boiler
control.
Stage swap:
To ensure the balanced utilization of the heat generators within a cascade, a running-
time-dependent leading stage swap can be activated.
After the set operating time of the presently leading heat generator, the system
switches to the heat generator with the next higher bus address.
Stage swap can be executed between several standard units or if several
condensing boilers are switched by a single standard unit.
Leading stage:
The leading stage can still be set manually to any existing stage even when
automatic stage-sequence switching is disabled. During parameterization, the
existing cascade stages are numbered according to their address in the data bus
(example: see below).
NOTE
Changing the heat generator type within the central device under address 10 leads
to an automatic reset of the leading stage setting to the first heat generator.
Peak load
from address:
The cascading plant can be divided into two groups (basic and peak load).
To this end, parameterization is used to set the first cascade stage of the peak load
group. During parameterization, the existing cascade stages are numbered
according to their address in the data bus.
In the example, the three condensing boilers will be used as basic load boilers. The
two atmospheric gas boilers will be used as peak load boilers. The peak load groups
will start at stage 4.
Example for addresses:
Address THETA
N/U
H-GEN type
H-GEN address
Numbering
Groups
10
MCBA
1
1
10
MCBA
2
2
10
MCBA
3
3
20
1-stage
---
4
30
1-stage
---
5
Summary of Contents for Controller Series
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