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Commissioning
Preventilation
Preventilation:
Care must be taken to ensure that the
boiler system is adequately
preventilated. The system-specific
instructions must be observed. The
burner is designed so that it is
preventilated when the full load setting is
selected. The preventilation times
depend on the automatic firing devices
and can be referred to in the relevant
chapter.
Q
V
min
N
L
V
air
Lüft
Hi
300 0
kW
V
air
L üft
10
,
35
Example
Nominal heat output setting
Combustion air requirement
Calorific fuel value
Intake air temperature
Barometer level
Excess air
Preventilation rate
Guide values
Calorific value
Hi
Natural gas E
10.35 kWh/Nm
Natural gas L
8.83 kWh/Nm
Fuel-oil EL
11.86 kWh/Nm
54
Assuming the conditions in the area or
the boiler unit
are the same for preventilation and
standard burner operation (loss of boiler
pressure, temperatures), the air rate
delivered by the burner for preventilation
may be calculated as follows:
(
273
)
1013
t
air
Luft
273
p
amb
, 9
56
/ ³
³
, 1
1 7
N m
N m
/
³
kW h
N m
QN
3000
VL min
Hi
10,35
tLuft
pamb
?
VLuft
Combustion air requirement VLmin
3
9.56 Nm
3
8.45 Nm
3
11.1 Nm
03/2016 - Art. Nr. 4200 1044 8002A
mbar
(
20
273
)
1013
C
K
273
98 0
K
m b a r
kW
3
3
3
9,56
Nm
/Nm
; Nm
/kg
3
3
kWh/Nm
; Nm
/kg
20
°C
980
mbar
1,17
3
?
Bm
/h
3
3
/Nm
3
3
/Nm
3
/kg
Please note:
in the case of electronic
compound controls (BT300/
Etamatic), the nominal load and nominal
preventilation position may be different,
depending on the setting. If this is the
case, the heat output that is reached in
the preventilation position during actual
burner operation must be applied for the
calculation.
m b a r
35 97
/ ³
B m
h
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