Matching The Burner To The Boiler - Unigas RX90 Installation Manual

RX90-RX91-RX510

Matching the burner to the boiler

The burners described in this manual have been tested with combustion chambers that comply with EN676 regulation and whose
dimensions are described in the diagram . In case the burner must be coupled with boilers with a combustion chamber smaller in dia-
meter or shorter than those described in the diagram, please contact the supplier, to verify that a correct matching is possible, with
respect of the application involved. To correctly match the burner to the boiler verify the necessary input and the pressure in combu-
stion chamber are included in the burner performance curve; otherwise the choice of the burner must be revised consulting the burner
manufacturer. To choose the blast tube lenght follow the instructions of the boiler manufacturer. In absence of these consider the fol-
lowing:

Cast-iron boilers, three pass flue boilers (with the first pass in the rear part): the blast tube must protrude no more than 100 mm into
the combustion chamber.

Pressurised boilers with flame reversal: in this case the blast tube must penetrate at least 50 - 100 mm into combustion chamber in
respect to the tube bundle plate.
The length of the blast tubes does not always allow this requirement to be met, and thus it may be necessary to use a suitably-sized
spacer to move the burner backwards or to design a blast tube tha suites the utilisation (please, contact the manifacturer).
Fig. 4
SIDE UP
SIDE
DOWN
Key
a) Heat output in kW
b) Length of the flame tube in meters
c) Flame tube firing intensity in MW/m
d) Combustion chamber diameter (m)
Fig. 4 - Firing intensity, diameter and lenght of the test flame tube as a function of the heat
input in kW.
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