GB-9
D
GB
F
NL
I
E
Coarse adjustment of motive air at the
eductor
▷
The settings of the air volume and the motive air
at the eductor affect each other. Coarse adjust-
ment should be carried out at the same time
during pre-purge.
p
FG
p
atm
p
FG
0
p
FG
8
7
9
Loosen
the screw
2 turns.
▷
Measure the negative flue gas pressure p
FG
against atmospheric pressure p
atm
.
0
Set the required negative flue gas pressure on
the motive air restrictor. Use the values from the
eductor diagram, see www.docuthek.com.
Pressure switch
▷
If the burner is equipped with an air flow detector
set ECO/E, the switching point should be set to
approx. 80% of the pressure differential for the
combustion air.
▷
Set the DW set for monitoring the flue gas flow
to the required pressure shown in the enclosed
documentation.
Preparing the gas pressure measurement
Connect all measuring devices to the burner for
later adjustment.
▷
Leave the gas supply closed.
Read off the differential pressure for the required
gas flow rate from the enclosed flow rate curve.
p1: gas pressure upstream of the measuring
orifice, p2: gas pressure downstream of the
measuring orifice. Measuring range: select ap-
prox. 15 mbar.
▷
Gas measuring nipple
G
, outside dia. = 9 mm
(0.35").
G
p
1
p
2
4
5
Loosen
the screws
2 turns.
Commissioning
Igniting and adjusting the burner
WARNING
Ensure adequate ventilation of the furnace chamber
before each burner start!
Risk of burning! Outflowing flue gases and burner
components are hot.
Wear ear defenders to protect yourself from harm-
ful noise.
▷
When heating up for the first time, vapours may
be emitted from gaskets or paint coatings, for
example, which may cause unpleasant odours.
All valves of the installation must be checked for
tightness before ignition.
Coarse adjustment with the furnace cold
▷
Coarse adjustment of the air volumes, see
page 7 (Preparing commissioning).
Limit the maximum gas volume.
▷
Open the restrictor around halfway.
Open the gas supply.
4
Ignite the burner.
▷
The safety time of the automatic burner control
unit starts to elapse.
5
Check and adjust the gas and air pressures.
6
If no flame is formed, reset the automatic burner
control unit, purge the combustion chamber and
ignite the burner again.
CAUTION
Pre-purge the furnace chamber or radiant tube
with air (5 x volume) before every ignition attempt.
▷
The burner ignites and proceeds to normal op-
eration.
▷
If no flame is formed after repeating steps
5
and
6
multiple times – see page 15 (Assistance in
7
Check the differential pressures ∆p
gas
and ∆p
air
and the negative flue gas pressure p
FG
, and set
them to their desired values.
▷
The gas, air and motive air settings affect each
other. We recommend reading these pressures
at the same time.
▷
Check the settings by conducting a flue gas
analysis (in the flue gas connector in the case of
an indirect heating system or in the furnace in the
case of a direct heating system). Ensure that the
furnace pressure is positive for a direct heating
system to avoid falsification of the measurements
by infiltrated air.
