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Determining the gas and combustion air
settings
▷ Orifices are installed in the gas and combustion
air connections on the burner.
▷ Adjustment is made on the basis of the flow rate-
dependent pressure differential. The required
pressure differentials for gas and air are shown
in the burner diagram.
[mbar ("WC)]
∆p
air
∆p
gas
Q
▷ Ensure an undisturbed flow to the orifice. The
ECOMAX
®
is delivered with a connection set for
gas. In the air circuit, we also recommend the
use of a connection set for air, see page 16
(Accessories).
▷ If pipe elbows and angles, reducing fittings, cou-
plings, etc. are used in the immediate vicinity
of the burner connection, differences from the
flow rate curves will occur which may result in
incorrect burner settings.
WARNING
Incorrect burner settings may result in sub-
stoichiometric burner operation.
CO formation in furnace chamber! CO is odour-
less and poisonous! A flue gas analysis is to be
conducted.
Notes on motive air at the eductor
▷ The motive air is set at the eductor by measuring
the negative flue gas pressure p
burner and eductor.
p
FG
▷ The required negative pressure is shown in the
eductor diagram, see www.docuthek.com, on
the basis of the maximum furnace temperature
and burner capacity.
▷ If the gas flue extraction rate is 80 – 90% at
maximum furnace temperature, a negative fur-
nace pressure will generally be avoided even at
a furnace temperature reduced by 400 – 500°C.
In the case of heavily leaking furnaces, flue gas
extraction must be reduced, where necessary, to
avoid pulling in cold air due to negative pressure
in the furnace chamber.
∆p
gas
∆p
air
Q
gas
air
[m
3
/h (ft
3
/h)]
between the
FG
▷ During the commissioning procedure, the motive
air setting must be optimized (maximization of
flue gas extraction). The furnace pressure must
remain slightly positive in all operating states
(0.1 to 0.3 mbar).
If the positive pressure exceeds approx. 0.3 mbar,
increase the flue gas extraction rate to prevent
the burner being damaged.
If there is a negative pressure in the furnace
chamber, reduce the flue gas extraction rate to
avoid infiltrated air.
Coarse adjustment of the combustion air
volume
Close the gas supply.
Start pre-purge.
▷ To adjust the air volume, especially for direct heat-
ing, use the differential pressure measurement
facility in the air circuit.
▷ Air measuring nipple L, outside dia. = 9 mm
(0.35").
Measuring the differential air pressure
3
L
4
p
2
p
1
Measuring the differential air pressure with
version W without an intermediate flange
3
L
4
p
1
6 Set the required air pressure differential on the
air restrictor.
GB-8
Loosen
the screws
2 turns.
5
p
1
∆p
0
L
Loosen
the screws
2 turns.
5
p
p
1
2
∆p
0
p
2
p
2
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