BIO · Edition 09.22
EN-6
➔
Install the ignition cable separately from ionization
and UV cables.
➔
A ≥ 7.5 kV, ≥ 12 mA ignition transformer is recom-
mended; 5 kV for integrated pilot.
Flame rod and spark electrode
1
2
3
4
5
6
Connect the PE wire for burner ground to the burn-
er insert. In the case of single-electrode operation,
route the PE wire from the burner insert directly to
the terminal on the automatic burner control unit.
WARnInG
High-voltage risk!
– It is essential that a high-voltage warning label
be attached to the ignition cable.
7
For more detailed information on how to wire the
ionization and ignition cables, refer to the operating
instructions and connection diagrams of the auto-
matic burner control unit and ignition transformer.
5 PRePARInG CoMMIssIonInG
5.1 safety instructions
➔
Agree on settings and commissioning of the burner
with the system operator or manufacturer.
➔
Check the entire system, upstream devices and
electrical connections.
➔
Note the operating instructions for individual con-
trols.
DAnGeR
Risk of explosion!
– Please observe the appropriate precautions
when igniting the burner.
– Pre-purge the furnace chamber or radiant tube
with air (5 x volume) before every ignition
attempt.
– 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.
DAnGeR
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.
– The burner must only be commissioned by
authorized trained personnel.
➔
If the burner does not ignite even though 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 au-
tomatic burner control unit operating instructions.
+
μ
A
–
Z
I
➔
The burner must only be ignited at low-fire rate
(between 10 and 40% of the rated capacity Q
max
) –
see type label.
5.2 Determining the gas and combustion air
flow rates
➔
Q
gas
:
Gas flow rate in m
3
/h (ft
3
/h)
➔
P
B
:
Burner capacity in kW (BTU/h)
➔
H
i
:
Gas heating value in kWh/m
3
(BTU/ft
3
)
➔
Q
air
:
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)
➔
Information on the gas quality supplied can be
obtained from the gas supply company.
Common gas qualities
Gas type
Heating value
H
u
H
o
L
min
kWh/
m
3
(n)
BtU/
sCF
m
3
(n)/
m
3
(n)
(sCF/
sCF)
Natural gas H
11.0
1114
10.6
Natural gas L
8.9
901
8.6
Propane
25.9
2568
24.4
Low calorific
value gas
1.7–3
161–
290
1.3–2.5
Butane
34.4
3406
32.3
➔
Data in kWh/m
3
(n) refer to the lower heating val-
ue H
u
and data in BTU/SCF refer to the higher
heating value H
o
(gross calorific value).
