How To Interpret The Burner's "Performance Curve - Unigas RX90 Installation Manual

How to interpret the burner's "Performance curve"

To check if the burner is suitable for the boiler to which it must be installled, the following parameters are needed:
furnace input, in kW or kcal/h (kW = kcal/h / 860);

backpressure (data are available on the boiler's ID plate or in the user's manual).

Example:
Furnace input: 600kW
Backpressure: 4mbar
In the "Performance curve" diagram (), draw a vertical line matching the furnace input value and an horizontal line matching the back-
pressure value. The burner is suitable if the intersection point A is inside the performance curve.
The values are referred to standard environmental conditions: 1013mbar, 15°C.
Checking the proper gas train size
To check the proper gas train size, it is necessary to know the available gas pressure value upstream the burner's gas valve. Then sub-
tract the backpressure. The result is called p
on the x-axis, as far as intercepitng the network pressure curve, according to the installed gas train (DN65, in the example). From the
interception point, draw an horizontal line as far as matching, on the y-axis, the value of pressure necessary to get the requested fur-
nace input. This value must be lower or equal to the p
Campo di lavoro bruciatori
Tipo P60 Mod. M-xx.x.IT.A.0.50 - M-.xx.x.IT.A.0.65
8
7
6
5
4
3
2
1
0
-1
100 200 300 400
Potenza kW
Fig. 2
Draw a vertical line matching the furnace input value (600kW, in the example), quoted
gas.
value, calculated before.
gas
Tipo / Type P60
M-...50 (Multibloc DUNGS MB-DLE 420 B01)
M-...65 (Filtro / Filter DN65+ SIEMENS VGD40.065 +SKP1x+SKP2x)
25
20
15
10
5
0
100 200 300 400
Potenza / Output (kW)
Fig. 3
6
A
500 600 700 800 900
Rp 2" (50)
DN65
500 600 700 800 900