5.7.1 Check pressure in the combustion cylinder
(safety check during commissioning)
During the pre-aeration phase, the maximum pressure in
the burner cylinder is measured and compared with the
nominal measured value (base for the factory setting). If
the measured maximum pressure differs more than 10
% from the nominal measured value, the settings of the
pressure switches B17 and B18 must be adjusted to the
conditions on site.
!
WARNING
The settings must only be changed by a spe-
cialist trained by Hoval or by Hoval customer
service.
1. Slightly loosen top screw on pressure switch B17
(connection point for the measurement).
B17
B18
2. Connect manual pressure measurement device to
pressure switch B17 and measure the maximum
pressure during the pre-aeration phase.
3.
Check whether the factory settings are suitable for
the local conditions:
- Compare measured value with the nominal meas-
ured value in the following table (deviation toler-
ance from the nominal measured value: ±10 %).
UltraGas
®
type
Factory setting
Nominal
measured
value
Pressure switch
B17
Pressure switch
B18
(15)
0.65 mbar
0.4 mbar
0.9 mbar
(20)
0.95 mbar
0.6 mbar
1.5 mbar
(27)
1.4 mbar
0.9 mbar
2.1 mbar
(35)
1.7 mbar
1.2 mbar
2.5 mbar
(50)
2.9 mbar
2.1 mbar
4 mbar
4.
Disassemble manual pressure measurement device.
5. Tighten upper screw on pressure switch B17.
6. Correct pressure switch B17 or B18 settings if neces-
sary (if the measured value differs more than 10 %
from the nominal measured value):
- Calculate setting value of the pressure switches
and compare with the setting position of the dials:
-
Pressure switch B17 setting value:
Measured value x 0.6 (safety factor)
Example: 0.8 mbar x 0.6 = 0.48 mbar
-
Pressure switch B18 setting value:
Measured value x 1.4 (safety factor)
Example: 0.8 mbar x 1.4 = 1.12 mbar
- Disassemble pressure switch covers.
- Set the pressure switch dials so that the outward-
facing arrow points to the calculated setting value.
- Fit pressure switch covers.
34
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COMMISSIONING
Summary of Contents for UltraGas 15
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