CHIEF Caldwell AF12-751, Owner'S Manual

Page: 20 / 40

Page 20 of 40
Bulletin 441G
OPERATING INSTRUCTIONS
1. PRELIMINARY TO STARTING THE FAN
When the fan is to be started for the first time, or after the fan has been idle for months, the
following checks should be made prior to starting the fan.
A. FAN BLADE
With the power locked out and tagged out at the disconnect switch, rotate the fan blade
to make sure it revolves easily and does not rub on the housing.
B. FASTENERS
Check all the fasteners to make sure they are tight. If any are loose, check for proper
clearance and retighten fasteners. Make sure the screen guard is fastened securely.
C. ELECTRICAL
With power locked out and tagged out at the disconnect switch, check all electrical
connections to make sure they are tight. Inspect the current carrying wires to make sure
they are not grounded. Make sure the control enclosure cover is secured in place.
D. WIRING
Refer to the wiring diagram on Pages 23 through 28 and make sure the fan is wired
correctly.
2. STARTING THE FAN
IMPORTANT INFORMATION
The single phase axial fans listed in the chart below use a permanent-split phase capacitor start motor.
The start switch and start capacitors have been eliminated for trouble free operation. The permanent-
split phase capacitor start motor is referred has a “slow start” motor because it comes up to speed
much slower than a capacitor start single phase motor. When the fan is started, allow the motor time
to accelerate to full speed without turning the power off according to the table below.
WARNING: DO NOT CONTINUE SHORT MULTIPLE STARTS AS OVERHEATING OF
THE MOTOR COULD RESULT.
Fan Model Time to Start
F12-751 5 Seconds
F14-11 8 Seconds
F18-112 8 Seconds
F18-312 8 Seconds
F24-512 8 Seconds
F24-712 10 Seconds
F24-1012 10 Seconds
F28-1212 16 Seconds
Table 8. Normal Time for Switchless
Motor to Reach Full Speed for 230
Volt Power Supply