5.3.4 Air damper/blower fan
Blower fan and air duct system
System menu
Boiler
Air damper/
blower fan
Blower fan and
air duct system
Primary air when boiler off
Specifies the primary air value when the boiler is "Off".
Primary air delay
Specifies the time delay for the primary air in seconds.
67% of the required air flap position is reached within this
period. The output reaches the setpoint when this time has
elapsed approximately five times. The parameter has an
attenuating function on the output signal of the primary air,
thereby preventing the primary air flap from opening too
quickly.
Primary air boost for startup
Parameter for primary air increase at the start of heating.
The primary air boost remains active for the entire heating
up process and after changing to “heating status” for the
boost duration (“duration of primary air boost from heating
status” parameter). After this time has elapsed, the primary
air increase is continually reduced to "0" over a period of 5
minutes. If the minimum combustion chamber temperature
has not been reached after the boost duration has
elapsed, the primary air boost remains active until the
minimum combustion chamber temperature has been
reached. If the combustion chamber temperature reaches
the start value of the CCT signal during the primary air
boost in “Heating” mode, the primary air boost is
immediately deactivated. This prevents excessive primary
air when the boiler is hot-started.
Duration of primary air boost from heating status
Defines the duration of the primary air boost after the
change to "heating" status. See also “Primary air boost for
startup” parameter.
Primary air opening at minimum feed
Specifies the primary air flap position at minimum power
(setting range 0 – 100%). As the air flaps should not open
or close fully during operation, the parameter “Primary air
opening at minimum feed" is used to define a control band
for the servo-motor, within which the primary air is
controlled.
Secondary air opening at 100% control
Specifies the secondary air flap position at 100%
secondary air (setting range 0 – 100%). As the air flaps
should not open or close fully during operation, the
parameter “Secondary air opening at 0% control" is used
to define a control band for the servo-motor, within which
the secondary air is controlled.
Secondary air opening at 0% signal
Specifies the secondary air flap position at 0% secondary
air (setting range 0 – 100%). As the air flaps should not
open or close fully during operation, the parameter
“secondary air opening at 100% control" is used to define
a control band for the actuator, within which the secondary
air is controlled.
Primary air opening at 100% control
Specifies the primary air flap position at 100% primary air
(setting range 0 – 100%). As the air flaps should not open
or close fully during operation, the parameter “Primary air
opening at minimum feed" is used to define a control band
for the servo-motor, within which the primary air is
controlled.
Secondary air delay
Specifies the time delay for the secondary air in seconds.
67% of the required air flap position is reached within this
period. The output reaches the setpoint when this time has
elapsed approximately five times. The parameter has an
attenuating function on the output signal of the secondary
air, thereby preventing the secondary air flap from opening
too quickly.
Min. duration combustion air fan run-on
Specifies the run-on time of the combustion air blower fan
after the stoker has been emptied for the remaining
material to be burnt. The time only starts running when
secondary and tertiary air have been shut off due to the
residual oxygen content. This means that when there are
low residual oxygen content values during shutdown the
run-on of the combustion air blower fan is extended. The
blower fan, however, switches off no later than after a
period of time has elapsed (“max. combustion air fan run-
on” parameter).
5
Menus and parameters
Boiler
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