13
E
. 04.
99•
G.
13
.1
1.
02
Start-up
Precision adjustment on KE 15:
•
At measuring point
B
measure gas nozzle pressure.
Gas nozzle pressure
≤
5mbar:
•
Start burner; if there is no flame formation, check adjustment.
•
After approx. 10 sec. correct starting gas pressure ps according to adjustment table.
Gas nozzle pressure > 5mbar:
•Start burner, if there is no flame formation, check
adjustment. If necessary adjust starting gas pressure
P
s
higher (attention: always adjust
P
s
≤
P
G
)
•After approx. 10 sec re-adjust main gas pressure
P
G
according to adjustment table.
•Then adapt dimension
"A"
air flow setting (see table).
Secure air setting with lock nut.
•Perform an exhaust gas analysis, paying special atten-
tion to eh CO emission.
•Seal off all measuring points.
Calculation principle for gas burner adjustment
The values given in the tables are setting values for start-up.
The necessary system adjustment must be newly determined in each case.
General:
The calorofic value (H
i,n
) of fuel gasses is usually given for normal atmospheric conditions
(0°C, 1013 mbar).
Natural gas type E
H
i,n
= 10.4 kWh/m
3
Natural gas type LL
H
i,n
= 9.3 kWh/m
3
Gas counters measure the volume of gas in the operational state.
Specifying throughput:
To allow correct setting of the heat generator load, the gas throughput must be determined in advance.
Example:
Height above sea level
230 m
Atmospheric pressure B (according to table)
989 mbar
Gas pressure P
G
at counter
20 mbar
Gas temperature
ϑ
G
16°C
Boiler rating Q
n
100 kW
Efficiency
η
K
(assumed)
92%
Calorific value H
i,n
10.4 kWh/m
3
Gas flow in standard state (V
n
)
Air setting
measurement "A"
Exhaust gas values
Reduce
if:
CO
2
too low
O
2
too high
Increase
if:
CO
2
too high
O
2
too low
V
n
Q
n
η
k
H
×
i n
,
--------------------
30kW
0 92 10
×
4
kWh
m3
-----------
,
,
----------------------------------------
=
3 1
m
3
h
-------
,
=
=
