18
Length Burner
dimension
Door
drilling
Model
Ø b
L.b
(m
in)
Ø p
(
mm)
L.p
(
mm)
XC-K 3 1000
250
300
270
171
XC-K 3 1250 - 1500
300
350
320
207
XC-K 3 1750 - 2000
300
390
320
278
XC-K 3 2500 - 3000
360
400
380
310
3.5 - BUrner
The burners operating with the XC-K3 boilers must have the EC
certification comply
with the local and / or national regulations
in force published in the official journal.
3.5.1 - CHOOSING THE BURNER
he correct choice and adjustment of the burner are fundamental
for optimal operation of the boiler and therefore must be done
carefully and not underestimated.
The burner must be chosen verifying that its firing rate (fuel
capacity - combustion chamber pressure) is compatible with the
same features declared for the boiler.
Remember that pressure drops on the flue side of the boiler, na
-
mely combustion chamber backpressure, refer to zero pressure
at the base of the chimney.
It is also recommended that the burner blast tube be no shorter
than the minimum dimension shown in the following table and
that the flame which must be implemented be suitable for the
characteristics of the combustion chamber.
In order to take advantage of the whole heat exchange surface
of the blind bottom furnaces, use burners capable of providing
a “long and narrow” flame in any operating condition, namely
even at the minimum output when controlling two or more stages
or modulating.
Flames which are too short cause overheating in the front of
the furnace and combustion products, not sufficiently cooled,
entering the smoke pipes at too high temperatures can seriously
damage the generator.
The manufacturing companies of the burners can supply the
dimensions of the flames which their appliances develop.
Ø
b
L.b
L.p
Ø
p
22
Note: For maintenance manager
For a good boiler operation, it is advisable to
calibrate the burner to a minimum Power (Qmin)
30% of the rated Power (Qn).
3.5.2 - insTalling The BUrner
The burner must be mounted to the door of the
boiler guaranteeing perfect sealing of the
combustion products.
The burner is supplied with
a piece of ceramic
fiber cord which must be placed on the blast
tube of the burner to fully seal the space
between the blast tube and the slot in the door.
Make sure that no gaps remain between the blast tube and the
slot on the refractory material inside the door.
Should a cone larger than the diameter of the blast tube be
mounted, it must be removed before mounting the burner on
the support plate and put back afterwards.
With the burner mounted, check that the electric cables are long
enough to allow the door to open 90°.
For gas-fired burners, flexible hoses cannot be used for
connections. Therefore it must be possible to disconnect the
final section of the gas adduction tube by means of a threaded
or flanged joint.
