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Table 9 — Fan Performance — 551A155 (With Standard 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 standard motor is 3.13. The max-
imum continuous watts is 2700. 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
753 915 1.05 786 972 1.12 892 1170 1.35 991 1378 1.58 1084 1595 1.83
4000
747 977 1.12 810 1090 1.25 911 1292 1.49 1007 1503 1.73 1097 1723 1.98
4250
741 1041 1.20 835 1220 1.40 932 1426 1.64 1024 1640 1.89 1111 1863 2.14
4500
761 1158 1.33 861 1360 1.56 954 1570 1.81 1043 1788 2.06 1127 2014 2.32
4750
792 1305 1.50 887 1512 1.74 977 1726 1.99 1063 1948 2.24 1145 2177 2.50
5000
823 1464 1.68 915 1676 1.93 1002 1894 2.18 1084 2120 2.44 1164 2352 2.70
5250
855 1635 1.88 943 1852 2.13 1027 2075 2.39 1107 2304 2.65 1184 2539 2.92
5500
887 1819 2.09 972 2041 2.35 1053 2268 2.61 1130 2501 2.88 ———
5750
920 2016 2.32 1002 2242 2.58 1079 2473 2.84 ——————
6000
953 2226 2.56 1031 2457 2.83 1107 2692 3.10 ——————
6250
986 2449 2.82 1062 2685 3.09 —————————
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 1822 2.10 1256 2057 2.37 1337 2299 2.64 1414 2549 2.93 ———
4000
1182 1952 2.24 1264 2188 2.52 1343 2432 2.80 1418 2683 3.09 ———
4250
1194 2093 2.41 1274 2332 2.68 1351 2577 2.96 ——————
4500
1208 2247 2.58 1286 2487 2.86 —————————
4750
1223 2412 2.77 1299 2655 3.05 —————————
5000
1240 2590 2.98 ————————————
5250
— — —— — —— — —— — —— — —
5500
— — —— — —— — —— — —— — —
5750
— — —— — —— — —— — —— — —
6000
— — —— — —— — —— — —— — —
6250
— — —— — —— — —— — —— — —
Bhp —
Brake Horsepower
FIOP —
Factory-Installed Option
Watts —
Input Watts to Motor