Technical description of the burner
9
20095042
3.7 Firing rates
MAXIMUM OUTPUT must be selected in area A)(Fig. 3) or area
B)(only for RLS 160/EV).
MINIMUM OUTPUT must not be lower than the minimum limit
shown in the diagram.
Tab. G
3.7.1 Procedure to refer burner operating condition
in high altitude plants
Find the CORRECTED BURNER CAPACITY for the plant’s alti-
tude in chart 1 and the CORRECTED PRESSURE in chart 2.
Check in the firing rate graph of the burner (Fig. 3), if the working
point defined by the values above is within the range limits.
If not, higher burner size is needed.
Note
➤ Charts are based only on altitude variation (reference temper-
ature = 68°F, 20°C)
➤ To get the combined correction in case of different air temper-
ature, a compensation of 1000 ft each 3.6°F (305 m each 2°C)
is applicable (100 ft = 0.36°F).
Example (RLS 160/E)
– Rated Capacity = 4111 MBtu/hr
– Rated Air Pressure = 2.33 “WC
– Reference Altitude = 328 ft
– Reference Temperature = 20°C = 68°F
– Real Altitude = 3000 ft
– Real Temperature = 17°C = 62.6°F
– Temperature Difference = 68°F – 62.6°F = 5.4°F
– Virtual Altitude Increment = 5.4°F/3.6°F x 1000 ft = 1500 ft
– Virtual Altitude = (Real Altitude) + (Virtual Altitude Increment) =
3000 ft + 1500 ft = 4500 ft
– Corrected Capacity = (4179+4201)/2 = 4190 MBtu/hr
– Corrected Pressure = (3.7+4.13)/2 = 3.9 “WC
Reference conditions:
– Ambient temperature 68 °F (20 °C)
– Barometric pressure 394” WC (1000 mbar)
– Altitude 328 ft a.s.l. (100 m a.s.l.).
Model MBtu/hr GPH
RLS 160/E 1176 8.4
RLS 200/E 2100 15
The firing rate area values have been obtained con-
sidering an ambient temperature of 68 °F, and an
atmospheric pressure of 394” WC and with the
combustion head adjusted as shown on page 20.
Fig. 3
D12061
Firing rate for C-UL Canadian Listing (CNL)
Combustion chamber pressure
“WC
Combustion chamber pressure
“WC
Firing rate for C-UL Canadian Listing (CNL)
D10998
RLS 160/E RLS 200/E
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