Carrier 39E/ER - Manual (Page 3)

FACTORY-SUPPLIED DRIVE SELECTION PROCEDURE
1. Obtain your fan speed and brake horsepower requirements from the fan data in
Catalog 39E-10P or from the Carrier Electronic Catalog.
2. Add 3% to the fan brake horsepower to compensate for drive loss.
3. Select motor by horsepower, type, frame size, voltage and motor rpm.
4. Select either fixed or variable pitch drive.
5. Examine the factory available drive speed range on Table 2. If not listed, re-evaluate
your selection for possible correction or request a quote control.
All standard applications should be covered in the Table.
Example: Having determined the fan requirements from the 39E-1 PD Catalog Selec­
tion Procedure, select a motor and drive.
Given: 39ED23 with FC fan
12,500 cfm
3.67 in. total pressure
1. From the 39E-10P Fan Catalog: 920 rpm
12 bhp
2. Allow for drive loss: 12 bhp x 1.03 = 12.36 bhp
3. Select motor per job specifications: 15 hp, ODP, 254T frame, 460/3/60, 1800 rpm
4. Select a variable drive per job specifications.
5. From Table 2, determine the available speed range for factory-supplied standard
drive is 671 - 1184 rpm. 920 rpm is a valid selection.