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Leak test
DANGER
To ensure that there is no danger resulting from a
leak, check the gas connections on the burner for
leaks immediately after the burner has been put
into operation.
8
Fine adjustment with a hot furnace
▷ Final adjustment of the burner should be carried
out at maximum furnace temperature and high
capacity demand.
9 Heat the furnace.
0 Watch the furnace pressure and O
furnace atmosphere. Avoid negative pressure
and sub-stoichiometric operation of the burner. If
necessary, adjust the settings of the combustion
air and motive air.
Check the differential pressures ∆p
and the negative flue gas pressure p
furnace temperature, and adjust them using the
appropriate restrictor.
p
∆p
▷ Check the settings by conducting a flue gas
analysis (in the flue gas connector or eductor 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.
DANGER
Risk of explosion and poisoning in case of
burner adjustment with an air deficiency! Ad-
just the gas and air supply so that the burner is
always operated with excess air – otherwise CO
will form in the furnace chamber. CO is odourless
and poisonous! Conduct a flue gas analysis.
Watch the furnace pressure at high capacity
demand and various furnace temperatures to
optimize the motive air setting.
▷ The furnace pressure should be slightly posi-
tive 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.
value in the
2
and ∆p
gas
at max.
FG
p
1
2
0
▷ If there is a negative pressure in the furnace
chamber, reduce the flue gas extraction rate to
avoid infiltrated air.
Blocking and recording the settings
Produce a measurement report.
4 Remove the measuring devices and close off
the pressure taps – tighten the grub screws.
5 Block and seal the adjusting elements.
6 Induce a flame failure, e.g. by pulling the terminal
boot off the flame rod. The flame detector must
close the gas safety valve and signal a fault.
7 Switch the system on and off several times while
monitoring the automatic burner control unit.
8 Produce an acceptance report.
DANGER
An incorrect change of the burner settings may
change the gas/air ratio and lead to unsafe operat-
ing conditions: risk of explosion in case of CO being
formed in the furnace chamber! CO is odourless
and poisonous!
Maintenance
air
We recommend a function check every six months.
If the media are highly contaminated, this interval
should be reduced.
DANGER
Maintenance work on the burner must be carried
out by authorized trained personnel only.
Risk of explosion! Please observe the appropriate
precautions when igniting the burner.
Risk of poisoning! Open the gas and air supply
so that the burner is always operated with excess
air – otherwise CO will form in the furnace chamber.
CO is odourless and poisonous! A flue gas analysis
is to be conducted.
Risk of burning! Outflowing flue gases and burner
components are hot.
▷ We recommend that all the gaskets removed
during maintenance work be replaced. The ap-
propriate gasket set is available separately as
a spare part.
Check the cable to the electrode.
Measure the ionization current.
▷ The ionization current must be at least 5 µA and
must not vary.
▷ Read off the ionization signal on the burner con-
trol unit.
Disconnect the system from the electrical power
supply.
4 Shut off the gas and air supply – do not change
the restrictor settings.
5 Disconnect the gas line from the gas insert.
6 Disconnect the grounding cable.
GB-10
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