Air Flow Monitoring; Purge Air And Cooling Air - Honeywell Ecomax Series Technical Information

Project planning information for direct heating

6 .10 Air flow monitoring

A system which includes air flow monitoring is recom-
mended to monitor pre-purge and as low air pressure
protection (pursuant to EN 746-2 and ISO 13577-2) if
there is no pneumatic air/gas ratio control system. This
is implemented using a differential pressure switch at
the air connection together with a burner control unit
BCU 465. An air flow monitoring set is available for this
purpose as an accessory, see page 62 (Air flow de-
tector set).

6 .11 Purge air and cooling air

Purge air must be connected to the burner ECOMAX in
order to ensure safe ignition and monitoring. Otherwise,
wet flue gas will enter the burner in the case of direct
heating, due to the furnace pressure.
ECOMAX · Edition 10.17
The required purge air volume is approx. 0.5 to 1.0%
of the air volume for rated capacity, or a minimum of
3
1 m /h.
(n)
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).
Nozzle for electrode
Burner
Nozzle electrode ECO 0
ECOMAX 0
Rp 1/4 D = 2.5 /E
Nozzle electrode ECO 1-3
ECOMAX 1 – 3
Rp 1/4 D = 2.5 /E
Nozzle electrode ECO 4-6
ECOMAX 4 – 6
Rp 1/4 D = 4.0 /E
At very high furnace temperatures, we recommend
cooling the burner head by selecting a larger nozzle or a
supply line with a diameter of 8 mm without a nozzle.
Purge air nozzle on
purge UV sensor
Nozzle UV ECO 0-3
Rp 1/4 D = 2.5 /B
Nozzle UV ECO 0-3
Rp 1/4 D = 2.5 /B
Nozzle UV ECO 4-6
Rp 1/4 D = 4.0 /B
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