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PERFORMANCE DATA (cont)
FAN RPM AT MOTOR PULLEY SETTING WITH STANDARD MOTOR* — 581B036-150
*Approximate fan rpm shown (standard motor/drive).
FAN RPM AT MOTOR PULLEY SETTING WITH HIGH-STATIC MOTOR* — 581B036-150
*Approximate fan rpm shown (high-static motor/drive).
ALTITUDE COMPENSATION* — 581B036-072
*As the height above sea level increases, there is less oxygen per cubic
foot of air. Therefore, the input rate should be reduced at higher altitudes.
†Orifices are available through your local Bryant distributor.
ALTITUDE COMPENSATION* — 581B090-150
*As the height above sea level increases, there is less oxygen per cubic
foot of air. Therefore, the input rate should be reduced at higher altitudes.
†Orifices are available through your local Bryant distributor.
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 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.
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.
UNIT
581B
MOTOR PULLEY TURNS OPEN
0
1
/
2
11
1
/
2
22
1
/
2
33
1
/
2
44
1
/
2
55
1
/
2
6
036 1044 1008 971 935 898 862 826 789 753 716 680 — —
048 1185 1144 1102 1061 1019 978 936 895 853 812 770 — —
060 1460 1425 1389 1354 1318 1283 1248 1212 1177 1141 1106 1070 1035
072 1585 1538 1492 1445 1399 1352 1305 1259 1212 1166 1119 — —
090,102 1085 1060 1035 1010 985 960 935 910 890 865 840 — —
120 1080 1060 1035 1015 990 970 950 925 905 880 860 — —
150 1130 1112 1087 1062 1037 1212 987 962 937 912 887 962 830
UNIT
581B
MOTOR PULLEY TURNS OPEN
0
1
/
2
11
1
/
2
22
1
/
2
33
1
/
2
44
1
/
2
55
1
/
2
6
036 1455 1423 1392 1360 1328 1297 1265 1233 1202 1170 1138 1107 1075
048 1455 1423 1392 1360 1328 1297 1265 1233 1202 1170 1138 1107 1075
060 1685 1589 1557 1525 1493 1460 1428 1396 1364 1332 1300 — —
072 1685 1589 1557 1525 1493 1460 1428 1396 1364 1332 1300 — —
090 1080 1025 1007 988 970 952 933 915 897 878 860 — —
102 1080 1025 1007 988 970 952 933 915 897 878 860 — —
120 1130 1112 1087 1062 1037 1212 987 962 937 912 887 962 830
ELEVATION
(ft)
72,000 AND 115,000/
60,000 and 90,000 BTUH
NOMINAL INPUT
150,000/120,000 BTUH
NOMINAL INPUT
Natural Gas
Orifice Size†
Liquid
Propane
Orifice Size†
Natural
Gas
Orifice Size
Liquid
Propane
Orifice Size†
0-2,000 33/38 43 30/32 38
2,000 34/39 43 30/33 39
3,000 35/40 44 31/34 40
4,000 36/41 44 32/35 41
5,000 36/41 44 33/35 42
6,000 37/42 45 34/36 43
7,000 37/42 45 35/37 43
8,000 38/43 46 36/37 44
9,000 39/43 47 37/38 44
10,000 41/44 48 38/40 45
11,000 43/45 48 39/41 45
12,000 44/45 49 40/42 46
13,000 44/46 49 41/43 47
14,000 45/47 50 42/43 47
ELEVATION
(ft)
125,000, 180,000, AND
224,000 BTUH
NOMINAL INPUT
250,000 BTUH
NOMINAL INPUT
Natural Gas
Orifice
Size†
Liquid
Propane
Orifice Size†
Natural Gas
Orifice
Size†
Liquid
Propane
Orifice Size†
0-2,000 31 41 30 38
2,000 32 42 30 39
3,000 32 42 31 40
4,000 32 42 32 41
5,000 33 43 33 42
6,000 34 43 34 43
7,000 35 44 35 43
8,000 36 44 36 44
9,000 37 45 37 44
10,000 38 46 38 45
11,000 39 47 39 45
12,000 40 47 40 46
13,000 41 48 41 47
14,000 42 48 42 47
ELEVATION MAXIMUM HEATING VALUE (Btu/ft
3
)
0-2000 1100
2001-3000 1050
3001-4000 1000
4001-5000 950
5001-6000 900
581B036-150