Bryant 581C - Manual (Page 221)

221
PERFORMANCE DATA (cont)
ALTITUDE COMPENSATION* —
580F180-300
*Includes a 4% input reduction per each 1,000 feet.
†Orifices available through your Bryant dealer.
ALTITUDE DERATING FACTOR*
*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
3 , the unit will require a 16% derating. For ele-
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
(LP Gas Units)
OUTDOOR SOUND POWER
LEGEND
NOTE: Indoor sound power is available in Bryant’s Electronic Catalog
program (ECAT) for specific operating parameters.
ELEVATION
(ft)
NATURAL GAS ORIFICE SIZE†
Low Heat High Heat
0-3,000 30 29
3,000- 7,000 31 30
7,000- 9,000 32 31
9,000-10,000 33 31
above 10,000 35 32
Fan Performance Using Accessory
Power Exhaust (580F180-300)
a50-4028
ELEVATION
(ft)
MAXIMUM HEATING VALUE
(Btu/ft 3 )
0-2,000 1,100
2,001-3,000 1,050
3,001-4,000 1,000
4,001-5,000 950
5,001-6,000 900
ELEVATION
(ft)
LIQUID PROPANE
ORIFICE SIZE
Low Heat and High Heat
0-2,000 36
2,000 37
3,000 38
4,000 38
5,000 39
6,000 40
7,000 41
8,000 41
9,000 42
10,000 43
UNIT
580F
SOUND
RATING
(60 Hz)
A-WEIGHTED
(dB)
OCTAVE BANDS
63 125 250 500 1000 2000 4000 8000
180 88 dB 87.6 90.8 88.7 86.4 84.3 83.5 78.4 75.6 66.8
210 88 dB 87.8 90.8 88.7 86.4 84.3 83.5 78.4 75.6 66.8
240 94 dB 94.4 99.7 93.0 93.7 91.8 89.7 85.9 80.7 74.4
300 94 dB 94.1 98.7 92.3 93.8 90.9 89.6 85.9 80.3 74.3
Bels — Sound Levels (1 bel = 10 decibels)
5
80F
180
-3
00