Page 31 of 40
Bulletin
441G
7.
The contactor for the 460 volt control is then reinstalled into the control enclosure,
and the toggle switch wires and the motor thermal protections wired per
Figure 19
on
Page 26
.
8.
Connect the motor leads to the output terminal of the contactor per the illustration in
Figure 23
. Note that the motor lead wires 4, 5 and 6 are secured together with a
wire nut.
9.
Refer to the Electrical Service Installation Instructions on
Page 15
for sizing the
electrical service on 230 Volt Three Phase Operation.
3.
TROUBLESHOOTING
When servicing the fan, lock out and tag out the power at the fan disconnect switch. Activate
power only when a check is made. The following items will help you pinpoint a possible
malfunction of the fan unit and explain the corrective action to take.
WARNING: BE CAREFUL WHEN WORKING WITH ELECTRICITY. USE A VOLTMETER TO
MAKE THE NECESSARY CHECK.
The slow start switchless motor used on a single phase fan has a slower, smoother
acceleration than a capacitor start motor. Refer to the starting the Fan on
Page 20
for
information on starting a single phase fan with a slow start switchless motor.
Refer to the appropriate diagram on
Pages 23
through 28
for the electrical schematic of the
controls.
A.
SYMPTOM: Turn on toggle switch and nothing happens.
1.
Make sure the power is available to the fan unit.
2.
Check the overload protection to determine if the control circuit is open or
closed. If the thermostat is open, make sure the overload device has had
a chance to cool, if the fan recently shut off. The overload circuit will
automatically close when the unit is cooled. If not, the thermostat will
need to be replaced in the motor.
a.
The thermostat wires (J wires) can be traced from the motor to
terminal L1 and the toggle switch.
3.
Check the toggle switch. (If switch is defective, replace.)
a.
The toggle switch circuit should be checked in the “OFF”, “RUN”,
and “START” positions. The top left side and top right side of the
toggle switch should be metered to the bottom of the toggle
switch and determined if the circuit is open or closed.
i.
In the “OFF” position, both side should be open.
ii.
In the “RUN” position, the left side should be closed and the
right side should be open.
iii.
With the toggle switch held in the “START” position, both
sides should be closed.
Summary of Contents for Caldwell AF12-751
Page 2: ...Page 2 of 40 Bulletin 441G ...
Page 23: ...Page 23 of 40 Bulletin 441G Figure 16 Wiring Schematic for AF12 751 Fan ...
Page 24: ...Page 24 of 40 Bulletin 441G Figure 17 Wiring Schematic for AF18 11 Fan ...
Page 25: ...Page 25 of 40 Bulletin 441G Figure 18 Wiring Schematic for 230 Volt Single Phase Axial Fan ...
Page 26: ...Page 26 of 40 Bulletin 441G Figure 19 Wiring Schematic for 230 Volt Three Phase Axial Fan ...
Page 27: ...Page 27 of 40 Bulletin 441G Figure 20 Wiring Schematic for 460 Volt Three Phase Axial Fan ...
Page 38: ...Page 38 of 40 Bulletin 441G NOTES ...
Page 39: ...Page 39 of 40 Bulletin 441G NOTES ...
Page 40: ...Page 40 of 40 Bulletin 441G ...
