Unigas G225X, Manual Of Installation - Use - Maintenance

Page: 9 / 112

PART I: SPECIFICATIONS
9
How to read the burner “Performance curve”
To check if the burner is suitable for the boiler to which it must be install-
led, the following parameters are needed:

furnace input, in kW or kcal/h (kW = kcal/h/860);

backpressure (data are available on the boiler ID plate or in the
user’s manual).
Example:
Furnace input: 600kW
Backpressure: 4 mbar
In the “Performance curve” diagram, draw a vertical line matching the fur-
nace input value and an horizontal line matching the backpressure value.
The burner is suitable if the intersection point A is inside the performance
curve.
Data are referred to standard conditions: atmospheric pressure at 1013
mbar, ambient temperature at 15° C.
Checking the proper gas train size
Performance Curves
To check the proper gas train size, it is necessary to the available gas pres-
sure value upstream the burner’s gas valve. Then subtract the backpressure.
The result is called
pgas. Draw a vertical line matching the furnace input
value (600kW, in the example), quoted 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 reque-
sted furnace input. This value must be lower or equal to the
pgas value, cal-
culated before.
Ba
ck pressu
re
mbar
[mbar]
G225X M-
Power [kW]
Back pressurembar
[m
bar]
G270X M- G325X M-
Power [kW] Power [kW]
Campo di lavoro bruciatori
Tipo P60 Mod. M-xx.x.IT.A.0.50 - M-.xx.x.IT.A.0.65
-1
0
1
2
3
4
5
6
7
8
100 200 300 400 500 600 700 800 900
Potenza kW
Contropressione in camera di
combustione mbar
A
backpre
ssur
e i
n
combust
ion chamb
e
r (mbar)
Power kW
0
5
10
15
20
25
100 200 300 400 500 600 700 800 900
Potenza / Output (kW)
Minima pressione gas in rete / Minimum inlet gas
pressure (mbar)
Rp 2" (50)
DN65
Power kW
minimum gas pressure
in
the net
work m
bar
DN65