Unigas HRX515, Manual Of Installation - Use - Maintenance

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PART I: SPECIFICATIONS
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1.8 Pressure in the Network / gas flow rate curves(natural gas)
1.9 Combustion head gas pressure curves depending on the flow rate
The curves referred to the gas pressure in the combustion head, depending on the gas flow rate, are referred to the burner properly
adjusted (percentage of residual O
2
in the flues as shown in the “Recommended combustion values” table and CO in the standard
limits). During this stage, the combustion head, the gas butterfly valve and the actuator are at the maximum opening. Refer to Fig. 5,
showing the correct way to measure the gas pressure, considering the values of pressure in combustion chamber, surveyed by means
of the pressure gauge or taken from the boiler’s Technical specifications.
Fig. 5
Note: the figure is indicative only.
Key
1 Generator
2 Pressure outlet on the combustion chamber
3 Gas pressure outlet on the butterfly valve
4 Differential pressure gauge
GAS PRESSURE
mbar
HRX515
Stm
3
/h
Caution: the gas rate value is quoted on the x-axis, the related network pressure is quoted on the y-axis
(pressure value in the combustion chamber is not included). To know the minimum pressure at the gas train
inlet, necessary to get the requested gas rate, add the pressure value in the combustion chamber to the value
read on the y-axis.
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2
4
3