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11. Now select the option 'Fan on?' and confi rm with the
'
'-button. The fan will start now. Switch the fan to
maximum speed by selecting this option. Confi rm with
the ' '-button. Now press the ' '-button. Select the
option 'Service settings' and confi rm with the ' '-
button. Press the ' '-button. Select the option 'Pres-
sure settings'; confi rm with the ' '-button.
Set the maximum differential pressure at 900 Pa,
using the ' '-button. Confi rm with the ' '-button.
Now press several times the ' '-button until you reach
the menu where you can read out the air differential
pressure.
A differential pressure of min. 900 Pa has to be
reached. If not, check the dimensions of the fl ue gas
discharge system. Set the maximum differential pres-
sure in the service level back at the standard level of
750 Pa. Confi rm with the ' '-button. Set the minimum
differential pressure at 110 Pa for a minimum load
of 33% (minimum return water temperature then is
45°C) or at 240 Pa for minimum load of 50% (mini-
mum return water temperature is 35°C).
12. Check the opening pressure of the gas block.
Connect a pressure differential device to the measu-
ring points pG and pF (see fi g. 19 for 7 and 9 sections
and g. 20 for 11 to 19 sections).
Open the main gas cock (vent the gas line). Discon-
nect the ignition device from the ignition electrode.
Press several times the '
'-button, until you reach
the menu with the selecting option 'Service settings'.
Select this option and confi rm with the '
'-button.
Now select 'Boiler on?'; confi rm with the ' '-button.
The boiler now will make a start attempt without igni-
tion. As soon as the gas valve opens, the opening
pressure can be read out on the pressure differential
device. The ope ning pressure should be bet ween 1
and 3 mbar. When you read out a higher pressure,
turn the N-controller to the left. Repeat point 12
after resetting the boiler. When the openings pressure
lies between 1 and 3 mbar, a correct pre-setting is
assured. Connect the ignition device again to the igni-
tion electrode and reset the boiler. Select in the serv-
ice level again the option 'Service tests' and confi rm
with the ' '-button.
13. The cursor is now placed on option 'Boiler on?'.
Press the ' ' button. The control unit will now start
from neutral position. After an internal check and a
check of the differential air pressure, the fan will start.
As soon as the differential air pressure is suffi ciently
high, the pre-purge time is started. The fan now pre-
purges for 30 seconds at full load. Then the fan slows
to minimum load. The pre-ignition is activated and the
gas valve opened. If, at the end of the safety time,
there is a suffi cient signal from the pilot fl ame (the
ame is checked with a second ionisation probe) the
boiler will start operating at part load (mi ni mum load).
Gas multi-block
Gas distribution pipe
Fig. 19 Differential pressure measuring points (boiler with 7 and 9 sections)
blue
black
burner
black
blue
Side view
gas = PL+PG
air = PL+PF
29


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