General Fan Performance Notes - Carrier 48FC M20 Series Service And Maintenance Instructions

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 mod-
els, the user must deduct low and medium heat static pres-
sures. Selection software is available, through your
salesperson, to help you select the best motor/drive combi-
nation for your application.
5. The fan performance tables offer motor/drive recommen-
dations. In cases when two motor/drive combinations
would work, the lower horsepower option is recom-
mended.
APPENDIX D — FAN PERFORMANCE
6.
7.
8.
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For information on the electrical properties of the fan
motors, please see the Electrical information section of
this book.
For more information on the performance limits of the fan
motors, see the application data section of this book.
The EPACT (Energy Policy Act of 1992) regulates energy
requirements for specific types of indoor fan motors.
Motors regulated 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.