Bryant 579F User Manual page 221

Fan Performance Using Accessory
Power Exhaust (580F180-300)
ALTITUDE COMPENSATION* —
580F180-300
NATURAL GAS ORIFICE SIZE†
ELEVATION
(ft)
Low Heat
0-3,000
3,000- 7,000
7,000- 9,000
9,000-10,000
above 10,000
*Includes a 4% input reduction per each 1,000 feet.
†Orifices available through your Bryant dealer.
SOUND
UNIT
RATING
580F
(60 Hz)
180 88 dB
210 88 dB
240 94 dB
300 94 dB
LEGEND
Bels — Sound Levels (1 bel = 10 decibels)
NOTE: Indoor sound power is available in Bryant's Electronic Catalog
program (ECAT) for specific operating parameters.
PERFORMANCE DATA (cont)
a50-4028
High Heat
30 29
31 30
32 31
33 31
35 32
OUTDOOR SOUND POWER
A-WEIGHTED
(dB)
87.6
87.8
94.4
94.1
ALTITUDE DERATING FACTOR*
ELEVATION
(ft)
0-2,000
2,001-3,000
3,001-4,000
4,001-5,000
5,001-6,000
*Derating of the unit is not required unless the heating value of the gas
exceeds the values listed in the table above, or if the elevation
exceeds 6000 ft. Derating conditions must be 4% per thousand ft
above 2000 ft. For example, at 4000 ft, if the heating value of the gas
exceeds 1000 Btu/ft
vations above 6000 ft, the same formula applies. For example, at 7000
ft, the unit will require a 28% derating of the maximum heating value
per the National Fuel Gas Code.
IMPORTANT: Local utility companies may be reducing heat content of
gas at altitudes above 2000 ft. If this is being done, changing spuds
may not be required.
ALTITUDE COMPENSATION — 580F180-300
ELEVATION
(ft)
0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
63 125 250
90.8 88.7 86.4
90.8 88.7 86.4
99.7 93.0 93.7
98.7 92.3 93.8
221
MAXIMUM HEATING VALUE
(Btu/ft
1,100
1,050
1,000
3 , the unit will require a 16% derating. For ele-
(LP Gas Units)
LIQUID PROPANE
ORIFICE SIZE
Low Heat and High Heat
OCTAVE BANDS
500 1000 2000
84.3 83.5 78.4
84.3 83.5 78.4
91.8 89.7 85.9
90.9 89.6 85.9
)
3
950
900
36
37
38
38
39
40
41
41
42
43
4000 8000
75.6 66.8
75.6 66.8
80.7 74.4
80.3 74.3