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Appendix D: Motor curves
Motor curves provide a way to proportionally increase or decrease speed, regardless of motor manufacturer.
For example, a Multifan motor might require 130 VAC to run at 50% RPM, while a Marathon motor might
need 100 VAC to run at 50% RPM. Without a motor curve, the Multifan motor would run at a slower RPM
than the Marathon motor at the same settings.
Selecting the correct motor curve allows you to set, for example, 50 on the control, and get much closer to
50% RPM on the motor then you would otherwise.
Use manual override or test mode to test and evaluate the operation and performance
of your fan motors. For more information, read
Testing sensors and equipment
on page
67.

If your fan motors are not running at approximately the correct RPM for the control settings, find your
fan in the following table, and then select the motor curve for your fan manufacturer and
model/specification.

If your fan motor is not listed, use the default motor curve (curve 1). If the default motor curve does
not operate your fan motor correctly, test the motor using manual override or test mode while selecting
the different curves.
Manufacturer Diameter
(inches)
Model Specifications Recommended curve
Aerotech 09 AT09Z2 3350 RPM 2
36 AT36Z1 4
Airstream 12 APP12F 1/4 HP, 1765 RPM 3
36 APP36 4
Baldor 14 1/4 HP, 1700 RPM 4
18 1/3 HP, 1700 RPM 4
24 1/3 HP, 1140 RPM 4
Canarm 09 PLF9 1/5 HP 4
12 PLF12 2
14 PLF14 2
16 PLF16 1/4 HP 2
18 2
Choretime (GE) 12 1/3 HP, 1140 RPM 1
Emerson 12 1/6 HP, 3400 RPM 2
Exafan 10 1/4 HP, 1700 RPM 2
14 1/4 HP, 1700 RPM 2
16 1/3 HP, 1700 RPM 2
18 1/3 HP, 1700 RPM 2
20 0.53 HP, 1700 RPM 2