Bryant 580D Product Information Manual page 54

ALTITUDE COMPENSATION* — 580D090-150
125,000, 180,000,
AND 224,000 BTUH
NOMINAL INPUT
ELEVATION
Natural
(ft)
Gas
Orifice
Size†
0-2,000 31
2,000 32
3,000 32
4,000 32
5,000 33
6,000 34
7,000 35
8,000 36
9,000 37
10,000 38
11,000 39
12,000 40
13,000 41
14,000 42
*As the height above sea level increases, there is less oxygen per
cubic foot of air. Therefore, heat input rate should be reduced at
higher altitudes.
†Orifices available through your local distributor.
EVAPORATOR-FAN MOTOR EFFICIENCY
UNIT
580D036,048
580D060
580D072
580D090-120
580D150
579F180 (3.7 Hp)
579F216 (5 Hp)
579F240 (7.5 Hp)
579F300 (10 Hp)
NOTE: All indoor-fan motors 5 hp and larger meet the minimum effi-
ciency requirements as established by the Energy Policy Act of 1992
(EPACT) effective October 24, 1997.
Fan Performance Using Accessory Power Exhaust (579F180-300)
PERFORMANCE DATA (cont)
250,000 BTUH
NOMINAL INPUT
Liquid Natural Liquid
Propane Gas Propane
Orifice Orifice Orifice
Size† Size† Size†
41 30 38
42 30 39
42 31 40
42 32 41
43 33 42
43 34 43
44 35 43
44 36 44
45 37 44
46 38 45
47 39 45
47 40 46
48 41 47
48 42 47
MOTOR EFFICIENCY (%)
75
74
84
80
87
85.8
87.5
88.5
89.5
ALTITUDE COMPENSATION* —
ELEVATION
(ft)
0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
*As the height above sea level increases, there is less oxygen per
cubic foot of air. Therefore, heat input rate should be reduced at higher
altitudes.
†Orifices available through your local distributor.
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 sea
level. For example, at 4000 ft, if the heating value of the gas exceeds
3
1000 Btu/ft , the unit will require a 16% derating. For elevations 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.
54
579F180-300
NATURAL GAS ORIFICE SIZE†
Lo Heat High Heat
28 29
29 29
29 30
29 30
30 30
30 30
31 31
31 31
31 31
32 32
ALL UNITS
MAXIMUM HEATING VALUE
3
(Btu/ft )
1,100
1,050
1,000
950
900