CHIEF Caldwell F12-751 User manual

P.O. Box 848
Kearney, NE 68848 USA
Phone [phone]
Fax [phone]
Part Number 740548
Bulletin 441G
Effective 1/2/2006
OWNERS MANUAL
INSTALLATION AND OPERATION
INSTRUCTIONS FOR
AXIAL FLOW FANS
This manual is for installation, operation, and maintenance of all Caldwell axial fans with serial numbers
06A__________ and up.
WARNING! Read this manual thoroughly before installing or operating fan. Keep this
manual in a location for quick access and reference.

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Bulletin 441G

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Bulletin 441G
TABLE OF CONTENTS
LIST OF FIGURES 4
LIST OF TABLES 5
INTRODUCTION 6
SAFETY 7
SERVICE NOTICE 10
PACKING LIST 11
MODEL SPECIFICATIONS 12-13
MOUNTING PAD 12
AXIAL SPECIFICATIONS 13
INSTALLATION INSTRUCTIONS 14-19
FOUNDATION 14
INSTALLATION 14
ELECTRICAL INSTALLATION 15
LEVELING 17
ACCESSORIES 17
INSTALLATION CHECK 17
AXIAL DIMENSIONS 18
ELECTRICAL SERVICE 19
OPERATING INSTRUCTIONS 20-21
PRELIMINARY 20
STARTING FAN 21
MAINTENANCE 22
FAN OPERATION OFF SEASON 22
FAN CONTROL 22
FAN LUBRICATION 22
BLADE CLEANING 22
WIRING DIAGRAM 23-28
AF12-751 23
AF18-11 24
SINGLE PHASE 230 VOLT 25
THREE PHASE 230 VOLT 26
THREE PHASE 460 VOLT 27
THREE PHASE 575 VOLT 28
FAN SERVICE 29-33
GENERAL INFORMATION 29
CONVERTING DUAL VOLTAGE FANS 29-30
TROUBLE SHOOTING 31
FAN REPLACEMENT PARTS 34-36
FAN PARTS 34-35
MOTORS 36
CONTROL PARTS 35
WARRANTY/SERVICE POLICY 37
NOTES 38

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Bulletin 441G
LIST OF FIGURES
Figure 1. Warning Label Locations 7
Figure 2. Danger High Voltage 8
Figure 3. Warning Rotating Blade 8
Figure 4. Warning to Prevent Roof Damage 9
Figure 5. Serial Number Plate 10
Figure 6. Fan Mounting Pad Location for Drying Transition 12
Figure 7. Fan Mounting Pad Location for Wall Adaptor with Angle Flange 12
Figure 8. Screen Guard Location 14
Figure 9. Field Power Installation Single Phase 16
Figure 10. Field Power Installation Three Phase 16
Figure 11. Motor Connection for Single Phase 17
Figure 12. Correcting Fan Rotation Three Phase 17
Figure 13. End and Side View of Axial Fan 18
Figure 14. Toggle Switch 21
Figure 15. Push Button Switch 21
Figure 16. Wiring Schematic for AF12-751 23
Figure 17. Wiring Schematic for AF18-11 Fan 24
Figure 18. Wiring Schematic for 230 Volt Single Phase Axial Fan 25
Figure 19. Wiring Schematic for 230 Volt Three Phase Axial Fan 26
Figure 20. Wiring Schematic for 460 Volt Three Phase Axial Fan 27
Figure 21. Wiring Schematic for 575 Volt Three Phase Axial Fan 28
Figure 22. Conversion 230/460 Volt 29
Figure 23. Conversion 460/230 Volt 30
Figure 24. Axial Fan Parts Disassembled 34
Figure 25. Control Enclosure Disassembled 36

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Bulletin 441G
LIST OF TABLES
Table 1. Fan Pad Distance from Bin Wall for use with Caldwell Drying Transition 12
Table 2. Fan Pad Distance from Building for use with Caldwell Wall Adaptor 12
Table 3. Fan Model Specifications for Tube Axial Aeration & Drying Fans 13
Table 4. Axial Fan Housing Dimensions 18
Table 5. Electrical Service for Single Phase Operation 230 Volt 19
Table 6. Electrical Service for Three Phase Operation 230/460 Volt 19
Table 7. Electrical Service for Three Phase Operation 575 Volt 19
Table 8. Normal Time for Switchless Motor to Reach Full Speed for 230 Volt 20
Table 9. Housing, Screen Guard, Control Enclosure Replacement Parts 34
Table 10. Motor, Blade Replacement Parts 35
Table 11. Contactor or Holding Coil for Converting from 460Volt to 230Volt 35
Table 12. Control Enclosure Parts (Furnas/Siemens Parts) 36

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Bulletin 441G
TO OUR VALUED CUSTOMER
The Chief Industries product you have recently purchased has been engineered and manufactured to
the highest possible standards. This unit has been assembled by caring and trustworthy individuals
who live in the plains of Nebraska and have your best interests in mind. Each Caldwell assembled
product has been 100% quality control inspected plus field simulated stress tested to assure
optimum dependability for you and your operation.
Before using your fan, it is your responsibility to read, understand and
follow all of the safety instructions in your operator's manual. Also
make sure that EVERYONE operating or near your fan understands and
follows all of the safety instructions in the manual.
Remember, a safety-minded, informed operator is the most important
safety aspect of your fan. Accidents can be avoided. Do not risk
injury or death -- be certain that every operator of your fan is well
acquainted with all the safety recommendations and operating
instructions in the manual. The table below will aid you in making sure
all employees or family members know the proper operation of your Chief Industries product. After
completely reading the manual, the table should be filled in.
DATE OPERATOR SIGNATURE OWNER SIGNATURE

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Bulletin 441G
Fi
g
ure 1 . Warnin
g
Label Locations
Safety Notice - Important - Read This!
Safety Alert Symbol
This symbol means ATTENTION! BE ALERT! YOUR SAFETY IS AT STAKE!
The Safety Alert Symbol identifies
important safety messages in this document
and on your fan. Make yourself familiar
with the messages identified for you with
the Safety Alert Symbol. When you see this symbol, be alert to
the possibility of serious injury or death. Follow the safety
instructions given in this manual and on your fan.
Signal Words
Danger:Indicates an imminently hazardous situation
which, if not avoided, will result in death or serious
injury.
Warning: Indicates a potentially hazardous situation
which, if not avoided, could result in death or serious
injury and property damage.
Caution:Indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate
injury. It may also be used to alert against unsafe
practices.
Fan Information:
A.) The unit utilizes electricity as the source of energy. When the power is installed
properly, and protective covers are in place, the unit poses no direct hazard.
WHEN INSTALLING OR SERVICING THE ELECTRICAL COMPONENTS, ALWAYS
SHUT THE POWER OFF AT THE FAN DISCONNECT, AND LOCK THE FAN
DISCONNECT IN THE OFF POSITION, SO NO POWER CAN BE DELIVERED TO THE
FAN WHILE YOU ARE SERVICING THE UNIT.
IN PERFORMING ELECTRICAL CHECKS WITH THE POWER ON, USE A VOLTMETER
AND BE CAREFUL NOT TO CONTACT LIVE PARTS.
B.) The unit, when operating, has a fan blade turning at high speed, and when guarded
with the screen guard, poses no direct hazard.
MAKE SURE THE SCREEN GUARD IS SECURELY FASTENED IN PLACE.
WHEN SERVICING THE FAN BLADE, MAKE SURE THE ELECTRICAL POWER IS
SHUT OFF AT THE FAN DISCONNECT, AND LOCK THE FAN DISCONNECT IN THE
OFF POSITION.

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Bulletin 441G
Safety Decals
READ AND BE CERTAIN THAT YOU FULLY UNDERSTAND THE MEANING OF ALL SAFETY DECALS
BEFORE OPERATING YOUR FAN.
Keep safety decals clean and readable at all times. Replace any safety decals that become unreadable or are
missing. If a part with an attached safety decal is replaced, make sure the proper safety decal is attached in
the proper location on the replacement part. You may obtain new decals from your local dealer.
The following are representative of the safety decals on your Axial fans:
I.) Danger High Voltage:
II.) Warning Rotating
Fan Blade:
Figure 2. Danger High Voltage
Figure 3. Warning Rotating Blade

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Bulletin 441G
Figure 4. Warning To Prevent Roof Damage.
III.) Warning Roof and Wall Damage of Structure:
Read and follow the safety instructions before starting your Axial fan:

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Bulletin 441G
CALDWELL AXIAL FAN
INSTALLATION AND OPERATION MANUAL
THIS MANUAL IS FOR THE INSTALLATION OPERATION AND MAINTENANCE OF ALL AXIAL
FANS WITH SERIAL NUMBER 06A_____ AND UP. READ MANUAL THOROUGHLY BEFORE
INSTALLING OR OPERATING THE FANS. KEEP THIS MANUAL IN A LOCATION FOR QUICK
ACCESS AND REFERENCE.
SPECIAL SERVICE NOTICE
If you are unable to remedy any service problem after thoroughly studying this manual, contact the
dealer from whom you purchased the unit. YOUR DEALER IS YOUR FIRST LINE OF SERVICE. GIVE
THEM THE INFORMATION REQUESTED BELOW AND EXPLAIN YOUR PROBLEM. If they are unable to
remedy the problem, refer to the factory. When calling the factory for service, ask for the Customer
Service Department. Give the information requested below and explain your problem. If adequate
information relating to the problem is given, the Customer Service Department should be able to
pin-point the problem and suggest an immediate remedy. THE CHIEF AGRI/INDUSTRIAL DIVISION
SERVICE POLICY IS INCLUDED AT THE END OF THIS MANUAL.
1.)*Fan Model Number __________________________
2.)*Fan Serial Number __________________________
3.)Size of Bin Diameter __________________________
4.)Type of Grain __________________________
5.)Grain Depth __________________________
6.)Line Voltage (Measured)__________________________
7.)*Dealer Purchased From__________________________
8.)*Date Purchased __________________________
* fill in these items at date of purchase
THE ABOVE INFORMATION MUST BE AVAILABLE BEFORE
CONTACTING THE DEALER OR FACTORY FOR SERVICE.
Figure 5. Serial Number Plate.

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Bulletin 441G
PACKING LIST
The shipment should contain the following items. Check carefully when unpacking and
before installing. In case of any shortage or damage while in shipment, file a claim with
the carrier.
QUANTITY COMPONENT DESCRIPTION
1 FAN FANASSEMBLY
1 BOLT BAG ASSEMBLY
1 MANUAL BULLETIN 441G
1 AUTHORIZED MOTOR
SERVICECENTER BULLETIN
FAN ACCESSORIES AVAILABLE
1.) A humidistat is available to cycle the fan according to ambient relative humidity conditions. The
Humidistat model NHC-2 (Part#736280) can be used with any fan that has 230Volt magnetic controls.
2.) Rainhoods are available to reduce the addition of rain water into the fan.
3.) Standard Drying Transitions are available for all fans used with full floors. Refer to the fan location
information on Page 12 when drying transitions are used.
4.) Electric Humidity Controllers are available for most fans. The Humidity Controller will supply a small
amount of heat to lower the relative humidity of the drying air and aid in grain storage.
5.) Gas Fired Heaters are available for most fans. The gas fired heater is used when a large temperature
rise is required. The Gas Fired Heater is a direct combustion unit and should not be used in inhabited
areas.

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Bulletin 441G
A
XIAL FAN B
F18 30"
F24 42"
F28 46"
A
XIAL FAN D
F18 3"
F24 3"
Table 1. Fan Pad Distance from Bin Wall
for use with Caldwell Drying Transition.
Table 2. Fan Pad Distance from Building
Wall for use with Caldwell Wall Adaptor
with Angle Flange.
Figure 6. Fan Mounting Pad Location for Drying Transition.
Figure 7. Fan Mounting Pad Location for Wall Adaptor with Angle Flange.

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Bulletin 441G
Table 3. FAN MODEL SPECIFICATIONS FOR TUBE AXIAL AERATION & DRYING
FANS
FAN MODEL
NO.
FAN
HORSE
POWER
MOTOR PHASE &
VOLTAGE
R.P.M. FAN
DIAMETER
INCHES
UNIT
AMPERAGE
MAX.
F12-751 0.75 SINGLE-115/230V 3450 12 7.0/3.5
F12-753 0.75 THREE-230/460V 3450 12 2.6/1.3
F14-11 1.00 SINGLE-115/230V 3450 14 9.2/4.6
F14-13 1.00 THREE-230/460 3450 14 3.6/1.8
DOMESTIC
UNITS
F18-11 1.50 SINGLE-230V 3450 18 6.5
AF12-751 0.75 SINGLE-115/230V 3450 12 7.0/3.5
AF18-11 1.5 SINGLE-230V 3450 18 6.5
F18-13 1.5 THREE-230/460V 3450 18 4.6/2.3
F18-135 1.5 THREE-575V 3450 18 1.6
F18-31 3.0 SINGLE-230V 3450 18 13.2
F18-33 3.0 THREE-230/460V 3450 18 8.4/4.2
F18-335 3.0 THREE-575V 3450 18 3.6
F24-51 5.0 SINGLE-230V 3450 24 28
F24-53 5.0 THREE-230/460V 3450 24 16/8
F24-535 5.0 THREE-575V 3450 24 6.4
F24-71 7.5 SINGLE-230V 3450 24 35
F24-73 7.5 THREE-230/460V 3450 24 22.4/11.2
F24-735 7.5 THREE-575V 3450 24 9.0
F24-101 10.0 SINGLE-230V 3450 24 38
F24-103 10.0 THREE-230/460V 3450 24 25/12.5
F24-1035 10.0 THREE-575V 3450 24 10.4
F28-121 12.5 SINGLE-230V 3450 28 51
F28-123 12.5 THREE-230/460V 3450 28 33/16.5
CSA
LISTED
UNITS
F28-1235 12.5 THREE-575V 3450 28 13.2
NOTE: Fan models F12-751, AF12-751, F14-11, F18-11, and AF18-11 have automatic
overload protection. All other fan models, except F12-753 and F14-13, have internal
thermal protection. Fan models F12-753 and F14-13 do not have internal motor
protection.
All Single Phase Fans utilize a Permanent-Split Phase Capacitor Start Motor.

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Bulletin 441G
INSTALLATION INSTRUCTIONS
1. FOUNDATION FOR THE FAN
For proper operation of your fan, the unit is to be mounted on a level pad. The fan should
not be anchored to the pad but allow to float on the pad. The fan pad should be at the same
elevation as the floor of the bin or 1.50” below the floor of a building.
A. PAD LOCATION FOR DRYING TRANSITION
When the Axial Fan is to be used with a standard Caldwell Drying Transition, locate the
fan pad as indicated in Figure 6 and Table 1 referred to on Page 12.
B. PAD LOCATION FOR WALL ADAPTOR WITH ANGLE FLANGE
When the Axial Fan is used with a standard Caldwell Wall Adaptor with an angle flange,
locate the fan pad as indicated in Figure 7 and Table 2 referred to on Page 12.
2. INSTALLATION OF THE FAN
a) PHYSICAL SIZE OF THE FAN
Figure 13 on Page 18 illustrates the physical size of the fan. Use the illustration and the
dimensions in Table 4 in determining the position of the fan when installed.
b) MECHANICAL CHECK
Rotate the fan blade to be sure it revolves freely and does not hit the housing. If there is
interference, the motor will need to be shimmed per the instructions on page 29. Check
all the fasteners on the fan to make sure they are tight. If any are loose, check for proper
clearance and retighten.
c) AIR FLOW DIRECTION INSTALLATION
In most applications fans are installed to
force air up through the stored grain. This
operating condition is referred to as a
“Positive” aeration system. For this
operation condition the screen guard is
mounted on the end of the fan opposite the
blade. The axial fans can be installed to
pull air down through the stored grain. This
operating condition is referred to as a
“Negative” aeration system. For this
operation condition the screen guard needs
to be moved to the blade end of the fan
housing.
d) FASTENING THE FAN TO A FLANGED
ADAPTOR
On the end of the fan housing opposite the
screen guard mount the fan to the
transition or aeration wall adaptor with the
fasteners provided in the bolt bag. (Eight 5/16” x 3/4” capscrews and 5/16” whiz nuts
are provided.)
Figure 8. Screen Guard Location.

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Bulletin 441G
3. ELECTRICAL INSTALLATION OF THE FAN
A. GENERAL INSTRUCTIONS
The electrical installation must be performed by a certified electrician, in accordance with
the appropriate national and local electrical codes.
(CAUTION: ANY VIOLATION OF ELECTRICAL WIRING CODES COULD
JEOPARDIZE THE CALDWELL STANDARD LIMITED WARRANTY.)
B. ELECTRICAL SERVICE INSTALLATION
Check the type of electrical service and make sure the fan to be wired is manufactured to
operate on the electrical service. Table 3 on Page 13 titled “Fan Model Specifications”
indicates the electrical service the fan is designed to utilize in the column labeled “Motor
Phase & Voltage”. The electrical service must match this specification. Note that the
Caldwell Three Phase 230V and 460V fans can be wired for either voltage, and if you need
to convert either of these models to the other voltage refer to Page 29.
The components to connect the electrical service to the fan need to be sized for the
electrical service present. Tables 5, 6 and 7 located on Page 19 illustrate the sizing
information for Single Phase 230 Volt, Three Phase 230 and 460 Volt, and Three Phase
575 Volt respectively. Use the appropriate table and size the following electrical service
components:
1.) TRANSFORMER
The transformer size for the fan only is indicated in a KVA rating. Example: For an
F18-312 Fan, Table 5 would be used. The KVA rating for the 3 horsepower motor is
4.5 KVA. This KVA rating is for the fan only. Your electrician will need to add the KVA
requirements for the other electrical components of the system in sizing the
transformer.
2.) FAN DISCONNECT
A disconnect for the fan needs to be sized to handle the recommended cartridge type
fusetron size. Example: For an F18-312 Fan, Table 5 would be used, and the
fusetron size is 30 amp. Install the fusetron recommended in the disconnect. Note
that a circuit breaker can be used, however, the circuit breaker or any fuse used, must
be a time delay type sized to provide the equivalent current in-rush of the fusetron
fuse to allow the initial starting in-rush current to the fan.
3.) CONDUCTOR SIZE FOR THE FAN DISCONNECT TO FAN WIRING
The conductor size for the fan needs to be sized according to the distance between the
fan and disconnect. Example: For an F18-312 Fan located 200’ from the disconnect,
use Table 5 to determine the conductor size to be a #6 AWG. The proper sized
wiring must be used to make sure a voltage drop is not developed.

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Bulletin 441G
C. ELECTRICAL CONNECTION AT THE FAN
1. SINGLE PHASE
When a 115 Volt accessory is to be
used with the Axial Fan a 4-wire
system should be provided for fans to
be operated on single phase power.
The four wires consist of the two
current carrying conductors, a
grounded neutral, and a ground.
When any 115 Volt accessory
equipment will not be used a 3-wire
system can be used. In this case the
grounded neutral wire is not required.
The current carrying conductors are
connected securely to terminals L1
and L2 of the contactor as illustrated
in Figure 9. The contactor is located
in the control enclosure. The ground
wire is secured to the terminal in the
control enclosure labeled “G”.
2. THREE PHASE
When a 115 Volt accessory is to be
used with the Axial Fan a 5 wire
system should be provided for fans to
be operated on three phase 230Volt
power. The five wires consist of three
current carrying conductors, a
grounded neutral and a ground. A 4-
wire system should be provided for
fans to be operated on 460 Volt or
575 Volt three phase power or when
any 115 Volt accessory equipment will
not be used. The four wires consist of
three current carrying conductors and
a ground. The current carrying
conductors are connected securely to
terminals L1, L2, and L3 of the
contactor as illustrated in Figure 10.
The contactor is located in the control
enclosure. The grounded neutral for
230 Volt systems is required for
application of any 115 Volt
accessories. The ground wire is
secured to the terminal in the control enclosure labeled “G”.
Figure 9. Field Power Installation Single
Phase.
Figure 10. Field Power Installation Three
Phase.

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Bulletin 441G
4. LEVELING OF THE FAN
A. AXIAL FAN
When fastened to the transition the fan legs should be evenly supported on the concrete
pad for smooth trouble free operation. If not, use shims under the fan leg, so the fan
cannot generate a natural frequency to vibrate.
5. INSTALLATION OF ACCESSORIES
For the proper installation of a humidistat, gas fired heater, or humidity controller, refer
to the installation instructions provided with each accessory.
6. INSTALLATION CHECK
When the fan is completely installed, the unit will need to be checked for proper rotation.
Provide power to the fan controls and start the fan momentarily. Make sure that the
blade rotation develops airflow in the direction that the decal on the fan housing
illustrates. If the blade is rotating the wrong direction, have your electrician correct as
follows:
A. SINGLE PHASE SYSTEM
With the power “LOCKED OUT AND TAGGED OUT” at
the fan disconnect, the motor lead wires will need to
be exchanged and then securely connected to the
outlet terminal of the contactor T1 and T2 as
illustrated in Figure 11. Note that this figure
illustrates the proper connection of the motor lead
wires for the counterclockwise rotation of the fan
blade. The location of lead wires is based on the lead
wire marking for motor labeled per the NEMA
standard. Refer to the motor nameplate for the
specific wiring connections and which wires are
interchanged to reverse rotation direction. The unit
will then need to be rechecked for proper rotation.
B. THREE PHASE SYSTEM
With the power “LOCKED OUT AND
TAGGED OUT” at the fan
disconnect, exchange the location
of the current carrying conductors
at terminals L1 and L3 of the
contactor as illustrated in Figure
12. The unit will then need to be
rechecked for proper rotation.
Figure 11. Motor Connection
for Single Phase.
Figure 12. Correcting Fan Rotation Three Phase.

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Bulletin 441G
Table 4. Axial Fan Housing Dimensions.
NOTE A: On the F12 and AF12 fan, four slots are used in the angle ring for mounting
located at 12:00, 3:00, 6:00, and 9:00.
NOTE B: On the F14 fan, four slots are used in the angle ring for mounting located
midway between the 12:00, 3:00, 6:00, and 9:00 locations.
NOTE C: On the F18, AF18, F24, and F28 fans, eight slots are used in the angle ring for
mounting located at 45 degree increments with the first slot at the top of the
fan housing.
NOTE D: The fan is placed on level concrete slab. Anchoring to the fan pad is not
required.
Fan
Model
"L"
Fan
Length
"H" Fan
Diameter
"C" Bolt
Circle
Bolt
Size
"A" Base
Location
"B"
Spacing
"D" Base
Length
AF12,
F12 14" 14 7/8” 13 1/8”
1/4" 0” 6” 1 1/4”
F14 14" 17 1/4” 15 3/8” 1/4" 0” 6” 1 1/4”
AF18,
F18 18" 21 3/4” 19 3/4”
5/16" 3 5/8” 14 1/4” 8”
F24 24" 27 1/2” 25 7/8” 5/16" 9 1/2” 18 1/2” 8”
F28 24" 31 7/8” 30” 5/16" 4 3/4” 21 3/8” 10”
Figure 13. End and Side View of Axial Housing.

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Bulletin 441G
TABLE 5. Electrical Service For Single Phase Operation 230 Volt
COPPER WIRE SIZE DISTANCE MOTOR
TO DISCONNECT IN FT. UP TO
MOTOR H.P.
TRANSFORMER
SIZE (NOTE B)
(MINIMUM)
0'-50' 100' 200' 300'
CARTRIDGE TYPE
FUSETRON OR
EQUIVALENT
TIME DELAY FUSE
AMP
1.5 2.5 KVA 14 12 10 8 15
3 4.5 KVA 12 10 6 5 30
5 8.5 KVA 8 6 4 3 50
7.5 10.0 KVA 6 6 3 1 60
10 13.0 KVA 6 4 2 1/0 70
12.5 16.0 KVA 4 2 00 000 80
TABLE 6. Electrical Service for Three Phase Operation 230/460 Volt
COPPER WIRE SIZE DISTANCE MOTOR TO
DISCONNECT IN FT. UP TO
CARTRIDGE
TYPE
FUSETRON OR
EQUIVALENT
TIME DELAY
FUSE AMP
0'-50' 100' 200' 300'
MOTOR
H.P.
TRANSFORMER
SIZE (NOTE B)
(MINIMUM)
230 460 230 460 230 460 230 460
230 460
1.5 2.5 KVA 14 14 14 14 12 14 10 12 10 5
3 4.5 KVA 14 14 12 14 10 12 8 10 15 8
5 8.5 KVA 12 14 10 12 6 10 4 8 30 15
7.5 10.0 KVA 10 14 8 12 6 8 4 6 40 20
10 13.0 KVA 10 12 8 10 4 8 2 6 50 25
12.5 16.0 KVA 48 12 6 10 2 6 1 4 60 30
TABLE 7. Electrical Service for Three Phase Operation 575 Volt
COPPER WIRE SIZE DISTANCE MOTOR TO
DISCONNECT IN FT. UP TO
MOTOR H.P.
TRANSFORMER
SIZE (NOTE B)
(MINIMUM)
0'-50' 100' 200' 300'
CARTRIDGE
TYPE FUSETRON
OR
EQUIVALENT
TIME DELAY
FUSE AMP
1.5 2.5 KVA 14 14 14 14 4
3 4.5 KVA 14 14 12 12 8
5 8.5 KVA 14 12 10 8 10
7.5 10.0 KVA 14 12 8 8 15
10 13.0 KVA 12 12 8 6 20
12.5 16.0 KVA 12 10 6 4 25
NOTE A: Always check current local, state, and national codes on electrical requirements
before installing any electrical equipment.
NOTE B: Transformer size is based on current draw from the fan only. Your electrician
will need to add the KVA requirements for other components of the system in
sizing the transformer.
NOTE C: Copper wire (rated 75°C) is sized for the fan service. The wire size from the
transformer to the disconnect service will be determined from the fan and the
other electrical equipment requirements.

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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 Su
pp
l
y