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Commissioning
If the connection pressure of natural gas is
below 15 or above 25 mbar, no setting and no
commissioning can take place.
At the Honeywell multiple setting device (chapter and
figure 4.3.6) are two nipples for measuring the gas
inlet
A
and the gas outlet pressure
B
.
Used for the mixing is an ultramodern, complete unit
comprising a mixing unit (Venturi), multiple setting
device and fan. This new type of gas mixing no longer
requires nozzles.
To set, proceed as follows:
a) Check the setting of the minimum and maximum
speed at the automatic firing unit according to the
parameter list.
b) Connect the boiler at the gas side and electrically.
To get into the service mode, press the „MODE“
and „+“ keys!
- Indication on the display during service mode:
the current level shows „SEr“ on the display
- after entering into this mode an efficiency of 50 %
is achieved.
The efficiency can be changed between 0 and 100
% with the „+“ and „-“ keys.
- exit of this mode:
Press the Reset-key or automatically after 20
minutes.
Adjust the boiler to 100 % with the „+“ key. Check
the CO
2
(O
2
)-content of the flue gas. It has to be
between 8,5 - 8,8 % (O
2
= 5,9 - 5,5) Vol.-% (dry).
Correct this value, if necessary by turning the
Throttle screw C of the Venturi (picture 4.3.6). Next
check the gas flow rate at the gas meter. (volumetric
meter). To calculate the setting gas flow rate the
operation calorific value H
uB
is needed. Ask your
gas utility for it. The setting value is calculated as
followed:
Heat load NB
Setting value =
Operation Calorific value H
uB
(kW/m
3
)
= NB
x
1000
l
H
uB
60 min
The gas flow rate is corrected by changing the fan
speed:
- Decrease the max. fan speed at the automatic
firing unit: -> gas flow increases (with constant
CO
2
(O
2
) value)
- reduction of the max. fan speed in the automatic
firing unit: -> gas flow increases (with constant
CO
2
(O
2
) value)
c) Press the „-“ key to set the boiler to 0%.
Check the CO
2
(O
2
)-content of the flue gas. It must
be between 8,5 - 8,8 % (O
2
= 5,9 - 5,5) Vol.-%
(dry). Correct the CO
2
(O
2
)
value where necessary
by turning the offset screw
D
at the Venturi (first
remove the protective cap).
d) Measurement of NOx and CO content. The
measured values must meet the limiting values
prescribed by the regulations. Values exceeding
these reference values are an indication of faulty
burner setting, gas burner or heat exchanger con-
tamination or gas burner defect.
If the limiting values prescribed by the
regulations are exceeded, the boiler
must be put out of operation and the
corresponding measures for repair
work must be initiated.
After a correction it is necessary to achieve the upper
and lower value again for a control/correction.
The boiler is now correctly set. To revert to normal
operation, press the „RESET“-key.
Changing to a different kind of gas
4.3.8
Changes are only to be carried out by
a recognised specialist!
The boiler is set to natural gas H at the factory (Wobbe
factor 15,0 kWh/m
3
).
Picture 4.4.5
