5
FIRING RATE (A)
During operation, burner output varies between:
•
a
MAXIMUM OUTPUT
, selected within area A,
•
and a
MINIMUM OUTPUT
, which must not be
lower than the minimum limit in the diagram.
RLS 250/M MZ
= 550 kW
Important:
The FIRING RATE area values have been
obtained 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 8.
MODULATION RATIO
The modulation ratio, determined using test boil-
ers according to standard (EN 676 for gas, EN
267 for light oil), is:
- 4 : 1 (gas);
- 2 : 1 (light oil).
In case of gas operation the burner can be used
with a different modulation ratio depending on
the application - contact the manufacturer for
further information.
TEST BOILER (B)
The firing rate was set in relation to special test
boilers, according to EN 676 regulations.
Figure (B) indicates the diameter and length of
the test combustion chamber.
Example:
Output 650 Mcal/h:
diameter = 60 cm; length = 2 m.
COMMERCIAL BOILERS (C) - IMPORTANT
The burner is suitable for operation on boilers
with combustion chambers featuring flow from
the base (three flue passes) on which the best
results are obtained in terms of low NOx emis-
sions.
The maximum thickness of the boiler’s front door
must not exceed 250 mm (see fig. C).
The burner-boiler match is assured where the
boiler is EC type-approved; for boilers and fur-
naces with combustion chambers featuring di-
mensions differing considerably from those
given in the diagram (B), it is advisable to per-
form preliminary tests.
(A)
D3170
D715
(B)
C
o
mbustion chamber
lenght -
m
D1079
(C)
250 mm MAX
C
o
mbustion chamber
pr
essur
e
-
mb
a
r
A
Summary of Contents for RLS 250/M MZ
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