Bryant Preferred Series Service And Maintenance Instructions page 82

Table L — Pulley Adjustment (Horizontal) - Fan RPM at Motor Pulley Settings
MOTOR/DRIVE
MODEL SIZE
Standard Static
17
Medium Static
3-phase
Standard Static
20
Medium Static
3-phase
Standard Static
24
Medium Static
3-phase
Standard Static
28
Medium Static
3-phase
NOTE: Do not adjust pulley further than 5 turns open.
Factory settings
GENERAL FAN PERFORMANCE NOTES
1. Interpolation is permissible. Do not extrapolate.
2. External static pressure is the static pressure difference between the return duct and the supply duct plus the static pressure
caused by any FIOPs or accessories.
3. Tabular data accounts for pressure loss due to clean filters, unit casing, wet coils, and highest gas heat exchanger (when gas heat
unit).
4. Factory options and accessories may effect static pressure losses. Gas heat unit fan tables assume highest gas heat models; for
fan selections with low or medium heat models, the user must deduct low and medium heat static pressures. Selection software
is available, through your salesperson, to help you select the best motor/drive combination for your application.
5. The fan performance tables offer motor/drive recommendations. In cases when two motor/drive combinations would work,
Bryant recommends the lower horsepower option.
6. For information on the electrical properties of Bryant motors, please see the Electrical information section of this book.
7. For more information on the performance limits of Bryant motors, see the application data section of this book.
8. The EPACT (Energy Policy Act of 1992) regulates energy requirements for specific types of indoor fan motors. Motors regu-
lated by EPACT include any general purpose, T-frame (three-digit, 143 and larger), single-speed, foot mounted, polyphase,
squirrel cage induction motors of NEMA (National Electrical Manufacturers Association) design A and B, manufactured for use
in the United States. Ranging from 1 to 200 Hp, these continuous-duty motors operate on 230 and 460 volt, 60 Hz power. If a
motor does not fit into these specifications, the motor does not have to be replaced by an EPACT compliant energy-efficient
motor. Variable-speed motors are exempt from EPACT compliance requirements.
APPENDIX C — FAN PERFORMANCE
COMBO
0
680
780
High Static 912
822
879
High Static 1021 1002
863
1021 1002
High Static 1176 1153
791
923
High Static 1107 1087
MOTOR PULLEY TURNS OPEN
0.5 1.0 1.5 2.0
663 647 630 614
763 747 730 714
895 879 862 846
802 782 762 742
862 846 829 813
984 965 947
846 828 811 794
984 965 947
1129 1106 1082
777 762 748 733
906 889 873 856
1067 1047 1027
82
2.5 3.0 3.5 4.0
597 580 564 547
697 680 664 647
829 812 796 779
722 702 682 662
796 779 763 746
928 909 891 872
777 759 742 725
928 909 891 872
1059 1035 1012 988
719 705 690 676
839 822 805 789
1007 986 966 946
4.5 5.0
531 514
631 614
763 746
642 622
730 713
854 835
707 690
854 835
965 941
661 647
772 755
926 906