Part 2: Overview of display values and settings
Expert
area
21
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.
Hyst Burner 2
(for solid fuel / 2nd burner)
(only for 2-stage burners or solid fuel integration)
Solid fuel integration: Hysteresis for the charging pump
2. Burner 2 and burner stage 2: see next page =>
Switching pattern for 2-stage burners
Gradient method
(only applies for HS 1)
This method permits early switch off of a heat generator
when heat consumption is low.
Example: Pellet boiler => When heat consumption is low,
a pellet boiler may possibly need to be switched off
before the set temperature is reached (burnt out). The
optimum switch off point is determined from the speed of
the temperature increase of the pellet boiler (
[K/min] =
gradient).
Gradient
On = Switch off according to gradient method
Off = Switch off by set value + Hysteresis
Max reduce
The value set determines the earliest switch off point as a
difference to the maximum temperature Max T-HS for
heat generator HS1:
Min. switch off point = Max T-HS – Max reduce
Dyn cutoff
Load-sensitive, premature deactivation of the HS by the
gradient of the temperature increase [K/min]. When the
HS is operating without load, the gradient value is high.
When the HS reaches or exceeds the gradient set here,
the HS is switched off at the earliest dynamic switch off
point (Max T-HS - Max reduce). If the temperature
increase is less, the switch off point is increased linearly
up to Max T-HS.
HS emergency cooling
For active HS emergency cooling, the collector pump (MF
01) and feeder pump (MF 03) are also activated.
The storage tank charging pump is activated
independently of the current timer program in the event of
an active HS emergency cooling, provided that the actual
storage tank temperature (F6) has not yet exceeded the
highest of the three set WW target temperatures. This
thus ensures further thermal transport from the
overheating boiler. If the HS emergency cooling is
activated by the “T-HS Cooling start” at sensor F8 is
exceeded, Pump HS1 (MF 05) is then activated.
HS Cool-fct
(activation of the emergency cooling function
for HS)
with T-HS Cool
(starting temperature for cooling)
!
Valid for the first boiler and the solid fuel boiler
(multifunction relay or boiler 2)
If the emergency cooling function for the heat generators
is activated (HS Cool-fct = On), then the heating circuits
commence operation with Max T-Flow (provided
emergency cooling is permitted in the heating circuit) as
soon as the set temperature T-HS Cool is exceeded by
one of the heat generators. The emergency cooling
function terminates when the temperature drops below
the starting temperature T-HS Cool by 5K.