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6 .2 Purging air and cooling air
Purging air must be connected to the burner Ecomax in order
to ensure safe ignition and monitoring, and in order to avoid
problems caused by condensation and/or overheating:
– At temperatures above 950°C in the case of indirect heat-
ing and horizontal burner installation to prevent the ce-
ramic insulation of the ignition electrode from overheating.
Heating
horizontal
Indirect
vertical
Direct
ECOMAX · Edition 02.11
ECOMAX 0–6
< 950°C
Purging air on UV sensor,
–
Purging air on electrode,
Purging air on UV sensor,
P2 set Eco 2.5 /E
Purging air on electrode,
P2 set Eco 2.5 /E
Purging air on UV sensor,
– In the case of indirect heating and vertical burner installa-
tion, irrespective of temperature, in order to prevent con-
densation forming in the burner. Otherwise the flue gas
will enter the burner due to thermal lift.
– In the case of direct heating, irrespective of temperature,
in order to prevent condensation forming in the burner.
Otherwise, the flue gas will enter the burner, due to the
furnace pressure.
The required purging air volume is approx. 0.5 to 1.0% of the
air volume for rated output, or a minimum of 1 Nm
The purging air is connected to the purging air connection on
the gas flange next to the electrode, or in the case of UV control
to the purging air connection of the UV sensor. The purging air
is tapped upstream of the air control valve so that the purging
air continues to flow even if the burner is switched off.
In order to limit the volume of purging air, special nozzles can
be used which are adjusted to the required air supply pressure
for the ECOMAX – see page 51 (P2/P3 set Eco).
Furnace chamber temperature
ECOMAX 0–3
Purging air on UV sensor,
P3 set Eco 2.5 /B
Purging air on UV sensor,
P3 set Eco 2.5 /B
Purging air on electrode,
P2 set Eco 2.5 /E
Purging air on UV sensor,
P3 set Eco 2.5 /B
ECOMAX 4–5
> 950°C
P3 set Eco 4.0 /B
P3 set Eco 4.0 /B
950°C to 1050°C
Purging air on electrode,
P2 set Eco 2.5 /E
> 1050°C
Purging air on UV sensor,
P3 set Eco 4.0 /B
23
3
/h.
ECOMAX 6
–
–
Purging air on electrode,
P2 set Eco 4.0 /E
P3 set Eco 4.0 /B
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