C.I.B. UNIGAS - M039175CD
5
GENERAL FEATURES
The gas coming from the supply line, passes through the valves group provided with filter and stabiliser. This one forces the pressure in
the utilisation limits. The electric actuator (14), that moves proportionally the air damper and the gas butterfly valve, uses an adjusting
cam (13) with variable shape. This one allows the optimisation of the gas flue values, as to get an efficient combustion. The combustion
head positioning determines the burner’s output. Fuel and comburent are routed into separated ways as far as the zone of flame gene-
ration (combustion chamber). The air (comburent) and fuel (gas) are forced into the combustion chamber. The control panel (1), placed
on the burner’s front side, shows each operating stage.
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:
z
furnace input, in kW or kcal/h (kW = kcal/h / 860);
z
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 (Fig. 4), draw a vertical line matching the furnace input value and an horizontal line matching the
backpressure value. The burner is suitable if the intersection point A is inside the performance curve.
Fig. 4
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
subtract the backpressure. The result is called
p
gas.
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
p
gas
value, calculated before.
Fig. 5
PART I: INSTALLATION MANUAL
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
Tipo / Type P60
M-...50 (Multibloc DUNGS MB-DLE 420 B01)
M-...65 (Filtro / Filter DN65+ SIEMENS VGD40.065 +SKP1x+SKP2x)
0
5
10
15
20
25
100
200
300
400
500
600
700
800
900
Potenza / Output (kW)
M
inima pr
essione gas in
rete / M
inimum inlet gas
pr
essur
e
(mbar
)
Rp 2" (50)
DN65
