54
5797 340 - 01
Vitoflex 300-RF Installation & Operating
Secondary Air
“Settings” tab
The secondary air parameters are used to determine
the heating output.
The amount of secondary air regulates the oxygen
content in the flue gas. Secondary air is blown in via
the door. If the set value for the amount of secondary
air is exceeded, the amount of fuel supplied is reduced.
Parameters
Description
Setting in
Setting
range
Default
value
“Residual O2, set”
Set value for the residual oxygen content, control
variable for secondary air control
%
4 to 15
7
“Resid. O2, part.
load, offset”
Sliding increase in the residual oxygen content at
partial load
Full load: 0% increase, minimum partial load: Up to 4%
increase
%
0 to 5.0
2
“Set resid. O2,
calculated”
Displays the current set value for the residual oxygen content (modulating set value)
Minimum value: “Residual O
2
, set” (at full load)
Maximum value: “Residual O
2
, set” plus “Resid. O
2
, part. load, offset” (at partial load)
“Residual O2,
minimum”
Minimum residual oxygen content
If the residual oxygen content falls below this value, the
feed system is stopped.
%
3 to 10
4
“Sec. air damper
position, partial
load”
Set value of damper position at partial load
Actual: Current open position of the secondary air damper
%
20 to “Sec.
air damper
position, full
load” -1
20
“Sec. air damper
position, full load”
Set value of damper position at full load
Actual: Current open position of the secondary air damper
%
“Sec. air
damper
position,
partial
load” +1
to 180
50
“Secondary set,
calculated”
Displays the current set value for the open position of the secondary air damper
(modulating set value)
Parameters