Expert area
Part 2: Overview of display values and settings
24
Switch Value
(-99 – +99)
Internal control value => only for switching cascade!
If this value reaches "0", the next heat generator is also
connected (only after the delay time has elapsed). If the
switching value reaches "-0", the last heat generator is
switched off.
If the desired temperature is exceeded by 1K, the last
heat generator is also switched off.
Block Time
(currently remaining value)
Display of current delay time. Only if "delay = 0" is it
possible to operate the next heat generator.
Max T-Module
(maximum temperature of the boiler)
Protects individual heat generators in the cascade from
overheating / prevents triggering LIMITER (limiter value).
This parameter is used to set a temperature at which the
different heat generators switch themselves off, or - in the
case of modulating heat generators - modulate
themselves down. The heat generators are switched on
again if they drop below this temperature by 5K
!
The Max T-HS temperature must be higher than
the maximum collector temperature.
Dyn Upward
(dyn. heat generator connection [K])
Small value = fast connection
Large value = slow connection
E
Values set too low can lead to overheating or short-
term connection of a heat generator.
Calculation: If the cumulative system deviation in Kelvin
reaches the set value A, this results in connection of all
heat generator stages.
Dyn Downward
(dynamic heat generator deactivation [K])
Small value = fast deactivation
Large value = slow deactivation
E
Values set to high can lead to overheating and
triggering the STB
Calculation: If the cumulative system deviation in Kelvin
reaches the set value A, this results in deactivation of all
heat generators.
Reset Time
(reset time for I-Control)
E
Control value: Changing this value can cause the
control system to overshoot. The recommended
default settings should be retained.
!
Small values cause a fast regulatory behavior and
could cause to a oscillation of the boiler
temperature.
Modulation Max
If this modulation degree is exceeded the next heat
generator in sequence is connected after the delay time
elapses.
Modulation Min
If values drop below this modulation degree the last heat
generator of the current sequence is switched off.
Min Mod HS
Connection of the next heat generator will only occur, if
the resulting modulation degree for the different heat
generators then exceeds the value set here.
=> For optimum operation with maximum number of
burners: Set “Modulation Max” = 0 and “Modulation Min”
to the minimum modulation degree for heat generator
stages.
Modulat DHW
(only for HW modules)
Entry of the set modulation degree for the heat
generators in hot water operation (see DHW HS).
Sequence 1
Entry of the sequence in which the heat generators are
set into operation in sequence 1.
F button [==>] Boiler number selection
Input of the boiler number
Sequence 2
Entry of the sequence in which the heat generators are
set into operation in sequence 2.
F button [==>] Boiler number selection
Input of the boiler number
!
With respect to two-stage heat generators, the
second stage is always switched after the first
stage.
Sequ Change
(type of sequence change)
Sequence 1 only
Sequence 2 only
Timed: Change between sequence 1 and 2 according
to operating hours of the first heat generator of the active
sequence.
1/2 switch: Conversion for heat generator with a
different nominal output: When the second boiler is
switched on, the first boiler will be put out of operation
until activated again.
Rotating: The first boiler of the sequence is placed in
last position of the current sequence after the sequence
switching time has elapsed.
Sorting: New boiler sequence by means of automatic
sorting according to operating hours in the event of
sequence change (sequence change according to
operating hours of the first heat generator of the active
sequence).
Time Seq-Mod
*)
(time to sequence change)
For operation with at least 2 heat generators there is the
option to swap the boiler sequence after the operating
hours specified here of the first heat generator of the
active sequence.
00 = no HS Sequence
Block-Time *)
(delay time for next stage)
Min. delay time after switching on or with switching HS,
also when switching a layer off until switching the next
layer on.
!
00 = 10 seconds; For correct settings, also ensure
the internal Block-Time for the closed burner
control.
*) These parameters can be additionally set in the
menu Heat generator adjustable