Unigas RX90 Installation Manual page 15

RX515 - RX520
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 about 200 mm into the

combustion chamber.
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.
1) MATERIALE REFRATTARIO
REFRACTORY WALL
ОГНЕУПОРНЫЙ МАТЕРИАЛ
2) FIBRA CERAMICA
CERAMIC FIBRE
КЕРАМИЧЕСКОЕ ВОЛОКНО
Fig. 5
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:: Firing intensity, diameter and lenght of the test flame tube as a function of the heat
input in kW.
15
1
2
200
3