6
FIRING RATES (A)
During operation, burner output varies between:
• MAXIMUM OUTPUT
, selected within area A (and B for
RS 120/M LN model),
•
and
MINIMUM OUTPUT
, which must not be lower
than the minimum limit in the diagram.
RS 68/M LN
= 570 MBtu/hr (167 kW)
RS 120/M LN
= 1136 MBtu/hr (333 kW)
Note
In order to utilize also area B (RS 120/M LN) it is neces-
sary to perform the calibration of the combustion head
as explained on page 8.
Important
The FIRING RATE area values have been obtained
considering an ambient temperature of 68 °F (20 °C),
and an atmospheric pressure of 394 “WC and with the
combustion head adjusted as shown on page 9.
Consult Procedure on page 16 to refer burner operating
condition in high altitude plants.
MINIMUM FURNACE DIMENSIONS (B)
The firing rates were set in relation to special test boil-
ers.
Figure (B) indicates the diameter and length of the test
combustion chamber.
Example:
Output 2579 MBtu/hr:
diameter = 23.6 inch; length 6.6 ft
COMMERCIAL BOILERS (C) - IMPORTANT
The RS 68/M LN - RS 120/M LN burners are suitable for
operation on either flame-inversion boilers
*
or boilers with
combustion chambers featuring flow from the base (three
flue passes) on which the best results are obtained in
terms of low NOx emissions.
The maximum thickness of the boiler’s front door must
not exceed 8” (see fig. C).
(
*
) For flame inversion boilers, a kit is available to reduce
CO emissions if required.
The kit includes 5 gas pipes, identical to the other 5
already fitted to the burner head. In standard condi-
tions, the burner head is fitted with a second group of
pipes, with gas outlet in a different direction with re-
spect to the others. With this Kit, the second group of
pipes is replaced, so that all the pipes are the same.
After fitting the kit, ensure they work correctly by
measuring the CO and flue gases emissions.
(A)
CA
M. C
O
MB. / F
E
UE
RR
AU
M
“W
C
CO
MB. C
H
AM
BER
/ CH
AMB
.
C
O
M
B
.
CAM. COMB. / FE
U
E
RRAUM
“WC
COMB
. CHAMBER /
CHAMB
. COMB
.
RS 68/M LN
RS 120/M LN
D2793
(B)
D2919
8” max
D1079
(C)
Le
ngth (fee
t)
Diameter (inches)
Recommended
furnace dimensions
