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3.8
Firing rates
MAXIMUM OUTPUT must be selected in area A or area B (Fig. 4).
MINIMUM OUTPUT must not be lower than the minimum limit
shown in the diagram.
Model
MBtu/hr
RLS 160/E
1770
NOTE:
The FIRING RATE areas given in (Fig. 4) have been reduced by
10% with respect to the maximum range that can be reached.
The FIRING RATE area values have been obtained
considering an ambient temperature of 68 °F, and
an atmospheric pressure of 394" WC and with the
combustion head adjusted as shown on page 20.
WARNING
3.8.1
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. 4), 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 20°F (305 m each
11°C) is applicable (100 ft = 2°F).
Example
Rated capacity = 3000 MBtu/hr - Rated air pressure = 1.5" WC
Real altitude
= 5000 ft - Real temperature = 108°F
= 108°F - 68°F (reference temp.) = 40°F
(equivalent 2000 ft variation)
40 : 2 = 20 x 100 = 2000 ft
Proceeding as descripted above and considering a "virtual altitude"
of (5000 + 2000) ft:
–
3000 MBtu/hr at 7000 ft, the corrected capacity is 3847 MBtu/hr
–
1.5" WC at 7000 ft, the corrected burner air pressure is 1.92
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.).
Technical description of the burner
GPH
13.5
9
GB
Firing rate for C-UL Canadian Listing (CNL)
See "Combustion head calibration" on page 17.
WARNING
Fig. 4
20026897
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