Bryant 579F User Manual page 131

FAN RPM AT MOTOR PULLEY SETTING WITH STANDARD MOTOR* — 581B036-150
UNIT
581B
0
036 1044
048 1185
060 1460
072 1585
090,102 1085
120 1080
150 1130
*Approximate fan rpm shown (standard motor/drive).
FAN RPM AT MOTOR PULLEY SETTING WITH HIGH-STATIC MOTOR* — 581B036-150
UNIT
581B
0 /
1
2
036 1455 1423
048 1455 1423
060 1685 1589
072 1685 1589
090 1080 1025
102 1080 1025
120 1130 1112
*Approximate fan rpm shown (high-static motor/drive).
ALTITUDE COMPENSATION* — 581B036-072
72,000 AND 115,000/
60,000 and 90,000 BTUH
NOMINAL INPUT
ELEVATION
(ft)
Natural Gas
Orifice Size†
Orifice Size†
0-2,000 33/38
2,000 34/39
3,000 35/40
4,000 36/41
5,000 36/41
6,000 37/42
7,000 37/42
8,000 38/43
9,000 39/43
10,000 41/44
11,000 43/45
12,000 44/45
13,000 44/46
14,000 45/47
*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.
ELEVATION MAXIMUM HEATING VALUE (Btu/ft
0-2000
2001-3000
3001-4000
4001-5000
5001-6000
PERFORMANCE DATA (cont)
/ 1 1 /
1 1
2 2
1008 971 935
1144 1102 1061
1425 1389 1354
1538 1492 1445
1060 1035 1010
1060 1035 1015
1112 1087 1062
1 1 / 2
1
2
1392 1360 1328
1392 1360 1328
1557 1525 1493
1557 1525 1493
1007 988 970
1007 988 970
1087 1062 1037
150,000/120,000 BTUH
NOMINAL INPUT
Liquid Natural Liquid
Propane Gas Propane
Orifice Size Orifice Size†
43 30/32 38
43 30/33 39
44 31/34 40
44 32/35 41
44 33/35 42
45 34/36 43
45 35/37 43
46 36/37 44
47 37/38 44
48 38/40 45
48 39/41 45
49 40/42 46
49 41/43 47
50 42/43 47
ALTITUDE DERATING FACTOR*
1100
1050
1000
950
900
MOTOR PULLEY TURNS OPEN
2 2 / 3 3
1
2
898 862 826
1019 978 936
1318 1283 1248 1212
1399 1352 1305 1259
985 960 935 910
990 970 950 925
1037 1212 987 962
MOTOR PULLEY TURNS OPEN
2 / 3 3 /
1 1
2 2
1297 1265 1233
1297 1265 1233
1460 1428 1396
1460 1428 1396
952 933 915
952 933 915
1212 987 962
ALTITUDE COMPENSATION* — 581B090-150
ELEVATION
(ft)
Natural Gas
0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000
*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.
*Derating of the unit is not required unless the heating value of the gas
3 )
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 , the unit will require a 16% derating. For elevations above 6000 ft, the
3
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.
131
/ 4 4 / 5
1 1
2 2
789 753 716 680
895 853 812 770
1177 1141 1106
1212 1166 1119
890 865 840
905 880 860
937 912 887
4 4 / 5
1
2
1202 1170 1138
1202 1170 1138
1364 1332 1300
1364 1332 1300
897 878 860
897 878 860
937 912 887
125,000, 180,000, AND
224,000 BTUH
NOMINAL INPUT
Liquid Natural Gas
Orifice Propane Orifice
Size† Orifice Size† Size†
31 41 30
32 42 30
32 42 31
32 42 32
33 43 33
34 43 34
35 44 35
36 44 36
37 45 37
38 46 38
39 47 39
40 47 40
41 48 41
42 48 42
5 / 6
1
2
— —
— —
1070 1035
— —
— —
— —
962 830
5 / 6
1
2
1107 1075
1107 1075
— —
— —
— —
— —
962 830
250,000 BTUH
NOMINAL INPUT
Liquid
Propane
Orifice Size†
38
39
40
41
42
43
43
44
44
45
45
46
47
47