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COMMISSIONING
C
D
B
A
Fig. 11
Measuring and setting points of the Honeywell multiple
set ting device VK 4125
A Measuring nipple for inlet pressure
B Measuring nipple for outlet pressure
C Choke screw for max. output (Inbus 4 mm)
D Offset-screw min. output (Torx T40)
5.4.5 Setting the gas flow rate CO
2
(O
2
) and measure-
ment of NOx/CO content in the flue gas (flue gas
measurement)
Important basic information:
If the minimum connection pressure (chapter 5.4.3) is
too low (e.g. because of clogged gas filter, under-dimen
-
sioned gas supply), the boiler will not achieve the rated
output indicated by the manufacturer. In this case, please
contact the gas supply company.
NOTICE
If the connection pressure of natural gas is
below 15 or above 50 mbar, no setting and
no commissioning can take place.
At the Honeywell multiple setting device (chapter 5.4.4)
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.
To set, proceed as follows:
a) Check the setting of the minimum and maximum
speed at the automatic firing unit according to the pa
-
rameter 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
CO
2
= 8,5 - 8,8 (O
2
= 5,9 - 5,5) Vol.-% (dry). Correct
this value, if necessary by turning the chocke bolt C
of the Venturi (chapter 5.4.4). 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:
Setting value E =
Heat load NB (kW)
Net heating 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 fir
-
ing unit: -> gas flow increases (with constan 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 CO
2
= 8,5 - 8,8 (O
2
= 5,9 - 5,5) Vol.-% (dry).
Correct the CO
2
(O2) value where necessary by turn-
ing the offset screw D at the venturi (first remove the
protective cap).
Fig. 12
Summary of Contents for TopGas 35
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