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Table
10 — Fan Performance — 551A155 (Wi
th Optional Indoor Fan Motor)
LEGEND
*Standard low-medium static drive range is 834 to 1064 rpm. Alternate
high-static drive range is 1161 to 1426. Other rpms require a field-
supplied drive.
NOTES:
1. Maximum continuous bhp for the optional motor is 4.38. The maxi-
mum continuous watts is 3775. Do not adjust motor rpm such that
motor maximum bhp and/or watts is exceeded at the maximum
operating cfm.
2. Static pressure losses (i.e., EconoMi$er) must be added to exter-
nal static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the
full bhp and watts range of the motor can be utilized with confi-
dence. Using your fan motors up to the watts or bhp rating shown
will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.
551A155 (12 TONS)*
Cfm
Available External Static Pressure (in. wg)
0.2 0.4 0.6 0.8 1.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
3750
753 942 1.08 786 998 1.15 892 1192 1.37 991 1395 1.60 1084 1606 1.85
4000
747 1006 1.16 810 1118 1.29 911 1315 1.51 1007 1520 1.75 1097 1733 1.99
4250
741 1073 1.23 835 1248 1.44 932 1448 1.67 1024 1657 1.91 1111 1872 2.15
4500
761 1191 1.37 861 1389 1.60 954 1593 1.83 1043 1804 2.07 1127 2022 2.33
4750
792 1339 1.54 887 1541 1.77 977 1749 2.01 1063 1963 2.26 1145 2183 2.51
5000
823 1499 1.72 915 1705 1.96 1002 1916 2.20 1084 2133 2.45 1164 2356 2.71
5250
855 1671 1.92 943 1880 2.16 1027 2095 2.41 1107 2316 2.66 1184 2541 2.92
5500
887 1854 2.13 972 2068 2.38 1053 2286 2.63 1130 2510 2.89 1205 2739 3.15
5750
920 2050 2.36 1002 2268 2.61 1079 2490 2.86 1154 2717 3.12 1227 2948 3.39
6000
953 2258 2.60 1031 2480 2.85 1107 2706 3.11 1179 2936 3.38 1249 3171 3.65
6250
986 2480 2.85 1062 2706 3.11 1135 2935 3.38 1205 3169 3.64 1273 3406 3.92
551A155 (12 TONS) (cont)*
Cfm
Available External Static Pressure (in. wg)
1.2 1.4 1.6 1.8 2.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
3750
1172 1825 2.10 1256 2051 2.36 1337 2284 2.63 1414 2523 2.90 1488 2768 3.18
4000
1182 1954 2.25 1264 2181 2.51 1343 2415 2.78 1418 2655 3.05 1491 2901 3.34
4250
1194 2094 2.41 1274 2323 2.67 1351 2558 2.94 1424 2799 3.22 1496 3045 3.50
4500
1208 2246 2.58 1286 2476 2.85 1360 2713 3.12 1432 2955 3.40 1502 3202 3.68
4750
1223 2410 2.77 1299 2642 3.04 1371 2880 3.31 1442 3123 3.59 1510 3372 3.88
5000
1240 2585 2.97 1313 2819 3.24 1384 3059 3.52 1453 3304 3.80 1520 3554 4.09
5250
1258 2773 3.19 1329 3009 3.46 1398 3250 3.74 1465 3497 4.02 1530 3748 4.31
5500
1276 2972 3.42 1346 3211 3.69 1413 3455 3.97 1479 3703 4.26 ———
5750
1296 3185 3.66 1364 3426 3.94 1430 3671 4.22 ——————
6000
1317 3410 3.92 1383 3653 4.20 —————————
6250
1339 3648 4.20 ————————————
Bhp —
Brake Horsepower
FIOP —
Factory-Installed Option
Watts —
Input Watts to Motor