ECOMAX · Edition 10.17
59
Project planning information for indirect heating
7 .10 Air flow monitoring
A system which includes air flow monitoring is recom-
mended to monitor pre-purge (pursuant to EN 746-2
and ISO 13577-2). This is implemented using a dif-
ferential pressure switch at the air connection together
with a burner control unit BCU 465. An air flow monitor-
ing set is available for this purpose as an accessory, see
page 62 (Air flow detector set).
7 .11 Purge air and cooling air
Purge air must be connected to the burner ECOMAX in
order to ensure safe ignition and monitoring, and in or-
der to avoid problems caused by condensation and/or
overheating:
The required purge air volume is approx. 0.5 to 1.0%
of the air volume for rated capacity, or a minimum of
1 Nm
3
/h.
The purge air is connected to the gas connection flange
next to the electrode, or in the case of UV control to
the purge air connection of the UV sensor. The purge
air is tapped upstream of the air control valve so that
the purge air continues to flow even if the burner is
switched off.
In order to limit the volume of purge air, special nozzles
can be used which are adjusted to the required air sup-
ply pressure for the ECOMAX – see page 63 (Purge
air/cooling air nozzles).
Burner
Nozzle for electrode
purge
Purge air nozzle on
UV sensor
ECOMAX 0
Nozzle electrode ECO 0
Rp 1/4 D = 2.5 /E
Nozzle UV ECO 0-3
Rp 1/4 D = 2.5 /B
ECOMAX 1 – 3
Nozzle electrode ECO 1-3
Rp 1/4 D = 2.5 /E
Nozzle UV ECO 0-3
Rp 1/4 D = 2.5 /B
ECOMAX 4 – 5
Nozzle electrode ECO 4-6
Rp 1/4 D = 4.0 /E
Nozzle UV ECO 4-6
Rp 1/4 D = 4.0 /B