GB-6
D
GB
F
NL
I
E
Preparing commissioning
Safety instructions
▷
Arrange the adjustment and commissioning of
the burner with the system operator or manu-
facturer.
▷
Check the entire system, upstream devices and
electrical connections.
▷
Note the operating instructions for individual
controls.
DANGER
The burner must only be commissioned by author-
ized trained personnel.
Risk of explosion!
Please observe the appropriate
precautions when igniting the burner.
Risk of poisoning!
Open the gas and air supply
so that the burner is always operated with excess
air – otherwise CO will form in the furnace chamber.
CO is odourless and poisonous! Conduct a flue
gas analysis.
▷
Pre-purge the furnace chamber with air (5 x
furnace chamber volume) before every ignition
attempt.
▷
If the burner does not ignite although the auto-
matic burner control unit has been switched on
and off several times: check the entire system.
▷
After ignition, monitor the flame and the gas and
air pressure measured on the burner. Measure
the ionization current. Switch-off threshold – see
automatic burner control unit operating instructions.
+
µ
A –
Z
I
▷
The burner must only be ignited at low fire
(between 10 and 30% of the rated capacity
Q
max
) – see type label).
DANGER
Risk of explosion! Fill the gas line to the burner
carefully and correctly with gas and vent it safely
into the open air – do not discharge the test volume
into the furnace chamber.
Determining the flow rates
Q
Gas
= P
B
/H
u
Q
Luft
= Q
Gas
.
λ
. L
min
▷
Q
Gas
: Gas flow rate in m
3
/h (ft
3
/h)
▷
P
B
: Burner capacity in kW (BTU/h)
▷
H
u
: Gas calorific value in kWh/m
3
(BTU/ft
3
)
▷
Q
Luft
: Air flow rate in m
3(n)
/h (SCFH)
▷
λ
: Lambda, air index
▷
L
min
: Minimum air requirement in m
3(n)
/m
3(n)
(SCF/SCF)
•
Use the lower calorific value
H
u
.
▷
Information on the gas quality supplied can be
obtained from the competent gas supply com-
pany.
Common gas qualities
Gas type
H
u
kWh/m
3(n)
(BTU/SCF)
L
min
m
3(n)
/m
3(n)
(SCF/SCF)
Natural gas H
11
(1114)
10.6
Natural gas L
8.9
(901)
8.6
Propane
25.9
(2568)
24.4
Town gas
4.09
(425)
3.67
Butane
34.4
(3406)
32.3
* Data in kWh/m³
(n)
refer to the lower calorific
value H
u
and data in BTU/SCF refer to the upper
calorific value H
o
.
▷
For safety reasons, a minimum air excess of 5%
(lambda = 1.05) should be ensured.
Notes on the flow rate curve
▷
If the gas density in the operating state differs
from that reflected in the flow rate curve, convert
the pressures according to the local operating
state.
p
B
= p
M
.
δ
B
δ
M
▷
δ
M
: Gas density reflected in the flow rate curve
[kg/m
3
(lb/ft
3
)]
▷
δ
B
:
Gas density in operating state
[kg/m
3
(lb/ft
3
)]
▷
p
M
: Gas pressure reflected in the flow rate
curve
▷
p
B
: Gas pressure in operating state
•
Read off the gas pressure p
gas
and air pressure
p
air
from the enclosed flow rate curve for cold
air on the basis of the calculated flow rates.
[mbar ("WC)]
[m
3
/h (ft
3
/h)]
p
gas
p
air
p
air
p
gas
Q
air
Q
gas
▷
Note possible capacity changes due to positive
or negative pressures in the furnace/combustion
chamber. Add positive pressures or subtract
negative pressures.
