G
Adjustment / Test
NEPTUNE 1&2_EN_Ver.2.1_45/2014 101
Mount pressure gauge on the fuel pump.
Adjust the fuel pressure according to the va-
lues in Technical data chapter A.
Note: Higher CO2 concentrations at different barometric pressure, altitude or temperature and poor
quality of the used fuel can lead to faster soot deposition on the heating coil of the heat exchanger.
Preparation
1. Set the fuel pressure.
2. Let the machine run in "Hot water" mode for at least two minutes so that it reaches operating tem-
perature and meaningful results can be measured.
Note: Machines that are primarily used for a brief period should run continuously for about half an
hour in "Hot water" mode before an exhaust measurement.
Measurement
3. Determine the soot rating with a soot pump and soot rating reference scale. The figure should not
exceed "1". Otherwise, open the air flap a little and repeat the measurement. Repeat the procedure
until the specified value is obtained.
.
4. Then the CO2 content in the exhaust, the intake and exhaust temperature are determined. This
can be done with conventional meters or with an electronic meter like the TESTO 325, which mea-
sures and displays all relevant data.
If the measured value is too low, close the air flap a little and check the soot rating and Co2 content
again.
Repeat all settings until all specified values are obtained.
5. Finally seal the set screw (arrow A) of the air flap with varnish.
Fig.G.10: Air flap.
The air flap on the side of the burner fan is
adjusted by a self-locking spindle on a set
screw. Turning clockwise increases the air
intake, turning counterclockwise reduces it.
Burner settings.
Fig.G.9: Fuel pressure setting.
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