Unigas LAMTEC BT3 Series, Manual Of Installation - Use - Maintenance

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PART II: INSTALLATION
18
Matching the burner to the boiler
(
low NOx burners)
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 type of the blast tube . Verify the necessary
input and the pressure in combustion 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 consider the following rule, even if it differs from the
instructions of the boiler manufacturer: Cast-iron boilers, three pass flue boilers (with the first pass in the rear part): the blast tube must
protrude about 150÷200 mm into the combustion chamber (Fig. 5).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 (Fig. 6).
WARNING! Carefully seal the free space between blast tube and the refractory lining with ceramic fibre rope or
other suitable means.
150÷200 mm
refactory wall
ceramic fibre
5° MAX
Fig. 5 Fig. 6