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A
(A)
(B)
1
2
(C)
(D)
B
3
4
2
1
3
4
D7648
FIRING RATES (A)
The burners can work in two ways: one-stage
and two-stage.
1st stage DELIVERY must be selected within
area A of the adjacent diagrams.
2nd stage DELIVERY must be selected within
area B. This area provides the maximum deliv-
ery of the burner in relation to the pressure in
the combustion chamber.
The work point may be found by plotting a verti-
cal line from the desired delivery and a horizon-
tal line from the pressure in the combustion
chamber. The intersection of these two lines is
the work point which must lie within area B.
Important
The FIRING RATE area values have been ob-
D7465
tained considering a surrounding temperature
of 20 °C, and an atmospheric pressure of 1000
mbar (approx. 100 m above sea level) and with
the combustion head adjusted as shown on
page 6.
TEST BOILER (B)
The firing rate was set in relation to special test
boilers in accordance with the methods defined
in EN 267 standards.
Figure (B) indicates the diameter and length of
the test combustion chamber.
Example: Delivery 35 kg/hour:
diameter = 50 cm; length = 1.5 m.
Whenever the burner is operated in a much
smaller commercially-available combustion
chamber, a preliminary test should be per-
formed.
D454
INSTALLATION
5
!
WORKING POSITION (C)
!
Installation 1 is preferable, as it is the only one
that allows the maintenance operations as de-
scribed in this manual. Installations 2, 3 and 4
D7466
allow the working, but make the operations of
maintenance and checking of the combustion
head more difficult page 12.
!
ONTO THE BRACKET (2)(D), USING THE AP-
PROPRIATE SCREWS (3)(D) WITH A NUT
AND A WASHER. FIX THE BRACKET TO THE
FRONT SHIELD OF THE BURNER, USING
THE SCREWS (4)(D).
4
THE BURNER MUST BE INSTALLED
IN CONFORMITY WITH LEGISLATION
AND LOCAL STANDARDS.
The burner is designed to work only in
the positions 1, 2, 3 and 4.
Any other position could compromise the
correct working of the appliance. Installa-
tion 5 is forbidden, for safety reasons.
BEFORE ASSEMBLING THE CASING,
IT IS NECESSARY TO FIX THE ENGI-
NE PROTECTION SUPPLIED (1)(D)
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