VA/AVA/AF
WARNING
This unit has rotating parts. Safety precautions
should be exercised at all times during installation,
operation, and maintenance.
ALWAYS disconnect power prior to working on
Personal Safety
Disconnect switches are recommended. Place the
disconnect switch near the fan in order that the
power can be swiftly cut off in case of an emergency,
and in order that maintenance personnel are
provided complete control of the power source.
Vane Axial Inline Blowers
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and maintenance instructions for standard units
of the VA/AVA/AF- Vane Axial Inline Blowers.
• VAD/VAB/VAHB • AVAD/AVAB
• AFB-C/AFBV-C • AFB-H/AFBV-H
• AFB-S/AFBV-S • AFD-C/AFDV-C
Carefully read this publication prior to any installation or maintenance procedure.
Loren Cook catalog, VA/AVA/AF, provides additional
information describing the equipment, fan performance,
available accessories, and specification data.
For additional safety information, refer to AMCA publication 410-96, Safety Practices for Users and Installers
of Industrial and Commercial Fans.
All of the publications listed above can be obtained
from Loren Cook Company by phoning (417) 869-6474,
extension 166; by FAX at (417) 832-9431; or by e-mail at
info@lorencook.com.
For information on special equipment, contact Loren
Cook Company Customer Service Department at (417)
869-6474.
Receiving and Inspection
Carefully inspect the fan and accessories for any damage and shortage immediately upon receipt of the fan.
• Turn the prop by hand to ensure it turns freely and
does not bind.
• Record on the Delivery Receipt any visible sign of
damage.
Outdoor Storage
To maintain good working condition of a Vane Axial when
it is stored outdoors, or on a construction site, follow the
additional steps below.
• Cover the inlet and outlet, and belt tunnel opening to
prevent the accumulation of dirt and moisture in the
housing.
• Periodically rotate the prop and operate dampers (if
supplied) to keep a coating of grease on all internal
bearing parts.
• Periodically inspect the unit to prevent damaging conditions.
Installation
To prevent damage to the fan during shipping, motors 25
HP and larger, and extremely heavy motors (cast iron or
severe duty) are shipped loose and must be field mounted
by bolting the motor on the motor mounting plate in the
existing mounting slots.
Handling
Handle your equipment with care. Some fans are provided with lifting lugs or holes for easy handling. Others
must be handled using nylon straps or well-padded
chains and cables which protect the fan’s coating and
housing. Spreade r bars shou ld be used whe n lifting large
parts.
Axial fans should be lifted by using straps around the
fan housing only. DO NOT LIFT AXIAL FANS BY THE
MOTOR, MOTOR BASE, PROP OR FLANGES.
Storage
If the fan is stored for any length of time prior to installation, completely fill the bearings with grease or moisture-inhibiting oil. Refer to Lubricants on page 6. Also,
store the fan in its original crate and protect it from dust,
debris and the weather.
VAD
Rubber-In-Shear Ceiling Isolators
Ceiling Mounted Spring Isolator
Figure 2 - Ceiling Mount Isolators
Non-ducted Inlet Clearance
MIN
1 DIA
Inlet Bell
Free Discharge
Correct
Incorrect
MIN
3 DIA
Inlet Duct Turns
Correct
Incorrect
Min 3
Dia
Isolation Installation
Note
Extreme vibration is a serious problem that may
cause structural and mechanical failure. To help
vibration and noise from being transferred to the
building, isolators are recommended.
Figure 1 -Floor Mount Isolators
Rubber-In-Shear Isolator
Spring Isolator
Floor Mounted Spring Isolators
a. Mount fan and motor on unitary base (if supplied).
b. Elevate fan (or isolation base) to operating height and
insert blocks to hold in position.
c. Position isolators under the fan and vertically align by
inserting leveling bolt through mounting holes in the fan or
the base. The isolator must be installed on a level surface.
d. Adjust the isolators by turning the leveling nut counter
clockwise several turns at a time alternately on each isolator until the fan weight is transferred onto the isolators and
the fan raises uniformly off the blocks. Then remove the
blocks.
e. Turn lock nut onto leveling bolt and secure firmly in place
against the top of the mounting flange or frame.
f. Secure isolators to mounting surface.
Duct Installation
Efficient fan performance relies on the proper installation
of inlet and discharge ducts. Be sure your fan conforms to
the guidelines below.
Non-Ducted Inlet Clearance
If your fan has an open inlet (no duct work), the fa n must
be placed one fan wheel diameter away from walls and
bulkheads.
Floor Mounted Rubber-In-Shear (RIS) Isolators
a. Mount fan and motor on a unitary isolation base (if sup-
plied).
b. Elevate fan to provide room to insert isolators between the
fan and foundation and block in position.
c. Position isolators under fan and secure bolts.
d. Remove blocks and allow fan to rest on floor. Isolators
must be installed on a level surface (leveling should not be
required).
e. Secure isolators to mounting surface.
Ceiling Mounted Spring and Rubber-in-Shear (RIS) Isolators
a. Elevate fan to operating height and brace.
b. Attach threaded rod to overhead support structure directly
above each mounting hole. Rod should extend to within a
few feet of fan.
c. Attach isolator to end of threaded rod using a nut on ea ch
side of isolator bracket.
d. Insert another section of threaded rod through the fan
mounting hole and isolator.
e. Attach two nuts to threaded rod in isolator.
f. Place adjusting nut and locking nut on threaded rod near
fan mounting bracket.
g. Alternately rotate adjusting nut at each mounting loc ation
until the fan weight is uniformly transferred to th e isolators.
Remove bracing.
Incorrect
Fan
Inlet Bell
Air Flow
Min
1 Dia.
Correct
Fan
Inlet Bell
Air Flow
Free Discharge
Avoid a free discharge into the plenum. This will result in
lost efficiency because it doesn’t allow for a static regain.
Correct
Incorrect
Inlet Duct Turns
For ducted inlets, allow at least 3 fan wheel diameters
between duct turns or elbows and the fan inlet.
2
Discharge Duct Turns
Discharge Duct Turns
Correct
Incorrect
MIN
3 DIA
Inlet Cone
1 foot
1/4 inch
Figure 3
When possible, allow 3 duct diameters between duct
turns or elbows and the fan outlet. Refer to the dra wings at
the top of page 3.
Correct Incorrect
Small
Duct
Diverging
Inlet
Cone
Air Flow
Fan
Large
Duct
Small
Duct
Inlet
Air Flow
Fan
Large
Duct
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is first started. Belts will produce a loud
squeal which dissipates after the fan is operating at full
capacity. If the belt tension is too tight or too loose, lost efficiency and possible damage can occur.
Do not change the pulley pitch diameter to change tension. This will result in a different fan speed.
a. Loosen motor plate adjustment bolts and move motor
plate in order that the belts can easily slip into the
grooves on the pulleys. Never pry, roll, or force the
belts over the rim of the pulley.
b. Adjust the motor plate until proper tension is reached.
For proper tension, a deflection of approximately 1/4”
per foot of center distance should be obtained by
firmly pressing the belt. Refer to Figure 3.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4.
Tolerance
Center Distance
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Maximum
Gap
Pulley Alignment
Pulley alignment is
OFFSET ANGULAR OFFSET/ANGULAR
A
W
CENTER
X
DISTANCE
Y
(CD)
adjusted by loosening
the motor pulley setscrew and by moving
the motor pulley on the motor shaft.
Z
B
GAP
GAP
Figure 4
Figure 4 indicates where to measure
the allowable gap for the drive alignment
tolerance. All contact points (indicated by
WXYZ) are to have a gap less than the
tolerance shown in the table. When the
pulleys are not the same width, the
allowable gap must be adjusted by half
of the difference in width (As shown in A
& B of Figure 4). Figure 5 illustrates
using a carpenter’s square to adjust the
position of the motor pulley until the belt
Figure 5
is parallel to the longer leg of the square.
Wiring Installation
All wiring should be in accordance with local ordinances
and the National Electrical Code, NFPA 70. Ensure the
power supply (voltage, frequency, and current carrying
capacity of wires) is in accordance with the motor nameplate.
Lock off all power sources befor e unit is wired to power
source.
Leave enough slack in the wiring to allow for motor movement when adjusting belt tension. Some fractional motors
have to be removed in order to make the connection with
the terminal box at the end of the motor. To remove motor,
remove bolts securing motor base to power assembly. Do
not remove motor mounting bolts.
Follow the wiring diagram in the disconnect switch
and the wiring diagram provided with the motor. Correctly label the circuit on the main power box and
always identify a closed sw it ch to promote safety (i.e.,
red tape over a closed switch).
3
4
5
6
1
728
3
9
L
1
L2L
3
456
789
12
3
L
1
L2L
3
Low Voltage
208/230 Volts
High Voltage
460 Volts
3 Phase, 9 Lead Motor
Y-Connection
Use of Variable Frequency Drives
Motors -
Motors that are to be operated using a Variable Frequency Drive (VFD) must be VFD compatible. At a minimum, this must be a Premium Efficiency motor with
Class F insulation. Motors that are not supplied by Loren
Cook Company should have the recommendation of the
motor manufacturer for use with a VFD.
Grounding -
The fan frame, motor and VFD must be connected to
a common earth ground to prevent tran sien t vo ltages
from damaging rotating elements.
Wiring -
Line reactors may be required to reduce over-voltage
spikes in the motors. The motor manufacturer should be
consulted for recommended line impedence and usage of
line reactors or filters, if the lead length between the VFD
and the motor exceeds 10 feet (3m).
Fan -
It is the responsibility of the installing body to perform
coast-down tests and identify any resonant frequencies
after the equipment is fully installed. These resonant frequencies are to be removed from the operating range of
the fan by using the “skip frequency” function in the VFD
programming. Failure to remove resonant frequencies
from the operating range will decrease the operating life of
the fan and void the warranty.
Please refer to AVA critical speed table on page 5. Variable frequency drives should not allow AVA fans to operate
between the low and the high speeds list.
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
T-1
T-4
Ground B
L
1
Line
L
2
Wiring Diagrams
3 Phase, 9 Lead Motor
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
7
6
1
L
1
When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
To reverse, interchange any 2 line leads.
2 Speed, 2 Winding, Single Phase Motor 2 Speed, 1 Winding, 3 Phase Motor
Ground A
T-1
T-4
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.
High Speed
L
1
L
2
Low Speed
Line
1
Together
2
Motor
3
L
1
4
L
5
2
6
Line
L
3
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
Single Speed, Single Phase, Dual Voltage 2 Speed, 2 Winding, 3 Phase
Ground A
L
T-5
J-10
Ground B
Link A
Link B
Low Voltage
Line
L
1
T-5
J-10
2
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
Ground A
Link A & B
High Voltage
T
Low Speed
3
Low Speed
T
L
1
Line
L
2
Motor
T
T
T
T
2
1
11
12
13
Low Speed
High Speed
High Speed
High Speed
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T
line leads.
and T2. Both Speeds-interchange any 2
1
Typical Fan Motor/Damper Motor Schematic
High Voltage
460 Volts
9
8
4
2
L3L
2
Low SpeedHigh Speed
789
5
3
456
3
12
L1L
L
3
2
L
1
1
L
2
3
4
5
6
2
L
3
Open
Line
L
L
L
1
2
Line
3
Transformer**
Fan
Motor
Damper
Motor*
Second
Damper
Motor
L3
L2
L1
Transformer**
For 3 phase, damper motor voltage should be the same between L1 and
. For single phase application, disregard L3. *Damper motors may be
L
2
available in 115, 230 and 460 volt models. The damper motor nameplate
voltage should be verified prior to connection. ** A transformer may be
provided in some installations to correct the damper motor voltage to the
specified voltage.
4
Prop Concerns
Instructions for adjusting blade angle setting on adju st-
able pitch Vane Axial Inline Blowers (AV A).
Note: Verify that the fan at the new pitch does not
operate at a critical speed, (RPM), see p age 7.
Warning: The maximum safe blade angle setting
for this fan is shown on the decal located inside the
hub cover.
a. Disconnect power supply.
b. Remove hub cover.
c. Placing a bubble protractor on the flat machined
surface on the discharge side of the hub, t ake an initial reading, when setting the blade to the desired
angle, (no greater than 40°) remember to allow for
the angle at which the fan is installed, as indicated
by the is initial reading.
d. Adjust each blade individually as follows (note that
one person should hold and adjust the blade while
another tightens the nuts).
e. Replace hub cover.
f. Reconnect power supply.
1. Place blade in 3 o’clock or 9 o’clock position.
2. Loosen retaining nut on blade bolt.
3. Postition bubble protractor on the face (discharge
side) of the blade at the indicated line. If the line is not
visible, position protractor on a line perpendicular to
the blade center line, and 30% of the wheel radius in
from the tip on 39”, 49”, 63” and 79” fans (22% On 3 5”,
44”, 55” and 71” fans).
4. Set blade to desired angle, correcting for angle of
installation.
5. Tighten nut so that blade is snug.
6. Recheck blade angle. If blade has shifted, tap blade
near hub with soft mallet to correct.
7. Tighten nut to tabulate torque:
Bolt Size
Minimum Maximum
5/8” 40 110
3/4” 140 190
7/8” 265 350
1” 450 550
Torque (Ft. Lbs.)
8. Rotate wheel to bring next blade into same position
and repeat steps 1-8 until all blades are adjusted.
AVA Critical Fan Speed (The AVA should not operate between the high and low RPM.)
Fan
Size
35
Fan RPM
Blade
Angle
Low High Low High Low High Low High Low High Low High Low High Low High
600 615
10
900 925 565 580 790 800 460 470 500 510 325 340 370 400 370 400
1820 1865 1135 1165 1590 1615 935 950 1005 1025 660 680 750 805 750 805
615 630
13
920 945 570 585 790 805 465 475 510 520 330 340 375 400 375 400
1860 1910 1150 1180 1595 1620 940 955 1015 1035 665 680 755 810 755 810
625 645
16
940 965 575 590 530 535 465 475 520 530 330 345 380 400 380 400
1895 1950 1160 1195 1600 1625 945 960 1020 1045 665 685 760 810 760 810
635 655
19
955 980 580 600 530 540 470 480 520 535 330 345 380 405 380 405
1925 1980 1175 1210 1605 1630 950 970 1025 1050 670 685 765 815 765 815
645 660
22
965 995 585 605 800 810 470 480 520 535 330 345 385 405 385 405
1950 2005 1185 1220 1615 1635 955 975 1035 1060 670 690 770 820 770 820
650 670
25
975 1005 590 610 805 815 475 485 525 540 330 350 385 405 385 405
1970 2025 1195 1230 1620 1645 960 980 1040 1065 675 695 775 820 775 820
655 675
28
985 1010 595 615 805 820 475 490 525 540 335 350 385 410 385 410
1980 2040 12051240 1625 1650 970 985 1050 1070 675 700 780 825 780 825
655 675
31
985 1015 600 620 810 825 480 495 525 540 335 350 390 410 390 410
1990 2045 12151250 1635 1660 975 990 1055 1070 680 700 785 825 785 825
660 675
34
990 1015 605 625 815 825 485 500 525 540 340 350 390 410 390 410
1995 2045 12201250 1640 1670 980 1000 1060 1075 685 700 790 830 790 830
660 675
990 1010 610 625 815 830 485 500 525 540 340 350 395 410 395 410
37
1995 2040 12251250 1650 1675 985 1005 1065 1080 690 705 795 830 795 830
655 670
40
985 1005 615 625 820 835 490 500 525 540 340 350 395 415 395 415
1990 2030 12301245 1655 1685 995 1010 1070 1085 695 705 795 835 795 835
Fan
Size
39
Blade
Angle
10
13
16
19
22
25
28
31
34
37
40
Fan RPM
370 385
375 390
380 395
385 400
390
405
390 410
395 410
400 415
400 420
405 420
410 420
Fan
Size
44
Blade
Angle
10
13
16
19
22
25
28
31
34
37
40
Fan RPM
525 535
525 535
795 805
795 810
530 540
535 545
535 545
540 550
540 550
545 555
545 555
Fan
Size
49
Blade
Angle
10
13
16
19
22
25
28
31
34
37
40
Fan RPM
315 320
320 325
320 325
320 325
320 325
320 325
325 330
325 330
325 335
325 335
325 340
Fan
Size
57
Blade
Angle
10
13
16
19
22
25
28
31
34
37
40
Fan RPM
330 340
335 345
340 350
340 350
340 350
340 350
345 355
345 355
350 360
350 360
350 360
Fan
Size
63
Blade
Angle
10
13
16
19
22
25
28
31
34
37
40
Fan RPM
215 225
220 230
220 230
220 230
220 230
225 235
225 235
225 235
225 235
225 235
225 235
Fan
Size
71
Blade
Angle
10
13
16
19
22
25
28
31
34
37
40
Fan RPM
250 265
250 265
250 270
255 270
255 270
255 270
260 270
260 275
260 275
260 275
265 275
Fan
Size
79
Blade
Angle
10
13
16
19
22
25
28
31
34
37
40
Fan RPM
250 265
250 265
250 270
255 270
255 270
255 270
260 270
260 275
260 275
275
260
265 275
5
Personal Safety
Disconnect switches are recommended. Place the
disconnect switch near the fan in order that the
power can be swiftly cut off in case of an emergency,
and in order that maintenance personnel are
provided complete control of the power source.
Prop Rotation
Test the fan to ensure the rotation of the wheel is the
same as indicated by the arrow marked Rotation.
115 and 230 Single Phase Motors
Fan wheel rotation is set correctly at the factory. Changing the rotation of this type of motor should only be
attempted by a qualified electrician.
208, 230, and 460, 3 Phase Motors
These motors are electrically reversible by switching two
of the supply leads. For this reason, the rotation of the fan
cannot be restricted to one direction at the factory. See Wiring Diagrams for specific information on reversing wheel
direction.
Do not allow the fan to run in the wrong direction. This
will overheat the motor and cause serious damage . For
3-phase motors, if the fan is running in the wrong direction, check the control switch. It is possible to interchange two leads at this location so that the fan is
operating in the correct direction.
Rotation
VAB/VAHB
Prop Side Prop Side Prop Side
Rotation
AVAB
Rotation
AFB
Final Installation Steps
a. Inspect fasteners and setscrews, particular ly fan
mounting and bearing fasteners, and tighten according
to the recommended torque shown in the table Recom-
mended Torque for Setscrews/Bolts.
b. Inspect for correct voltage with voltmeter.
c. Ensure all accessories are installed.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power so ur ces.
b. Ensure fasteners and setscrews, particularly those
used for mounting the fan, are tightened.
c. Inspect belt tension and pulley alignment.
d. Inspect motor wiring.
e. Ensure belt touches only the pulley.
f. Ensure fan and ductwork are clean and free of deb ris.
g. Inspect prop-to-inlet clearance. The correct prop-to-
inlet clearance is critical to proper fan performance.
h. Close and secure all access doors.
i. Restore power to the fan.
Start Up
Turn the fan on. In variable speed units, set the fan to
its lowest speed and inspect for the following:
• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for squealing).
• Improper motor amperage or voltage .
Recommended Torque for Setscrews/Bolts
Setscrews
Recommended
Size
No.10 3/32” 28 33 3/8”-16 240
5/16” 5/32” 126 156 5/8”-11 1200
7/16” 7/32” 29 348 7/8”-9 2040
Key Hex
Across
Flats
1/4” 1/8” 66 80 1/2”-13 600
3/8” 3/16” 228 275 3/4”-10 2100
1/2” 1/4” 42 504
3/4” 3/8” 120 1440
Torque
Inch-lbs.
Min. Max. Size
Hold Down Bolts
Wrench
Torque
(inch-lbs)
--5/8” 5/16” 92 1104
If a problem is discovered, immediately shut the
fan off. Lock out all electrical power and check for the
cause of the trouble. See Troubleshooting.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory
operation. During the inspections, stop the fan and
inspect as per the Conditions Chart.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts.
Adjust and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten
as necessary.
24 Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating
conditions and location of the fan.
Inspect fans exhausting corrosive or contaminated air
within the first month of o peration. Fans exha usting contaminated air (airborne abrasives) should be inspected
every three months.
Regular inspections are recommended for fans
exhausting non-contaminated air.
It is recommended the following inspection be conducted twice per year.
• Inspect bolts and setscrews for tightness. Tighten as
necessary.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed.
Refer to Belt and Pulley Installation, page 3.
• Bearings should be inspected as recommen de d in
the Conditions Chart on page 6.
6
• Inspect springs and rubber isolators for deterioration
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
including 184T
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
and replace as needed.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing
assures proper motor cooling. Removing dirt from
the wheel and housing prevent imbalance and damage. housing prevent imbalance and damage.
Lubrication - Fan Bearings
V ane Axial bearings ar e lubricated through a grease fitting on the exterior of the fan housing and should be
lubricated by the schedule, Lubrication Conditions Chart.
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead
forms around the bearing seals. Excessive grease can
burst seals thus reducing bearing life.
Before lubricating, the grease nipple and immediate
vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease shou ld be su pp lied
slowly as the bearing rotates until fresh grease slips past
Lubrication Conditions Chart
Fan Class Fan Status
Normal Conditions
Inlet Vane
Axial Blowers
(Clean, Dry & Smooth)
Extreme Conditions
(Dirty/Wet/Rough)
Fan Operating
Temperature (F)
up to 120 4,500
121 to 160 1,500
161 to 200 700
201 to 400 (*) 200
up to 160 700
161 to 200 400
201 to 400 (*) 200
Maximum Interval
(operational hrs)
or excessive contaminates, it is advisable to have the maintenance department disassemble and lubricate the bearings after 3 years of operation to prevent interruption of
service.
For motors with provisions for relubrication, follow inter-
vals of the table below.
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Motor Services
Should the motor prove defective within a on e -ye a r
period, contact your local Loren Cook representative or
your nearest authorized electric motor service representative.
the seal. Excessive pressure should be avoided to prevent seal damage.
Use no more than three injections with a hand-oper-
ated grease gun.
Exceptions to the greasing interval chart:
• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be per-
formed prior to each break in operation.
• Higher Te mperature: it is reco mmended to halve the
intervals for every 30°F increase in operating temperature above 120°F not to exceed 230°F for standard bearings; High Temperature bearings (optional) can operate
up to 400°F.
• Vertical Shaft: it is recommended that the intervals
should be halved.
Loren Cook Company uses petroleum lubricant in a
lithium base. Other types of grease should not be used
unless the bearings and lines have been flushed clean. If
another type of grease is used, it should be a lithiumbased grease conforming to NLGI grade 2 consistency.
A NLGI grade 2 grease is a light viscosity, low-torque,
rust-inhibiting lubricant that is water resistant. Its temperature range is from -30°F to +200°F and capable of intermittent highs of +250°F. For temperatures above 250°F
Mobiltemp SHC 32 is recommended.
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Motor bearings without provisions for relubrication will
operate up to 10 years under normal conditions with no
maintenance. In severe applications, high temperatures
Changing Shaft Speed
All belt driven AF fans with motors up to and including 5
HP are equipped with variable pitch pulleys. To change the
fan speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
b. Turn the pulley rim to open or close the groove facing.
If the pulley has multiple grooves, all must be adjusted
to the same width.
c. After adjustment, inspect for proper belt tension.
Speed Reduction
Open the pulley in order that the belt rides deeper in
the groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that the belt rides higher in
the groove (larger pitch diameter ). Ensure that th e RPM
limits of the fan and the horsepower limits of the motor
are maintained.
The AVAB and VAB have standard fixed pitch
sheaves. To change speeds, consult factory.
Pulley and Belt Replacement
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys and
shafts.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when exces-
sive force is used in placing the pulleys on their
respective shafts.
7
g. Tighten in place.
6
5
4
3
2
1
Airflow
h. Install belts on pulleys and align as described in the Belt and
Pulley Installation section.
Bearing Replacement
The fan bearings are pillow block ball bearings.
a. Loosen and remove belts by lowering motor mounting plate
with the four adjusting nuts.
b. Remove the bearing cover. Do not remove fan sheave yet.
c. Remove prop by loosening setscrews and retaining bolts and
sliding off shaft.
d. Record the location of the fan sheave from end of shaft, and
remove the sheave.
e. Record the distance from the bearing to the end of the shaft.
f. Loosen setscrews on bearings and remove shaft.
g. Remove bearings and replace with new bearings.
h. Slide shaft through bearings until shaft protru des the same
amount as original shaft. Tighten setscrews.
i. Replace fan sheave in original location.
j. Replace prop but do not tighten yet.
k. Slide prop on shaft and center prop.
l. Replace and tighten belts.
m. Test run the fan.
n. Re-tighten setscrews on bearings, sheave, and prop . Recheck
belt tension and adjust as needed.
o. Replace bearing cover.
Prop Adjustment
The AVA prop pitch is adjustable. Consult factory for procedure.
VAD Parts List
Item
No.
1 Drum Weldment
2 Propeller Fixed Pitch
3 Prop Bushing
4 Motor
5 Wiring Box
6 Motor Mounting Bolts
Description
8
VAB Parts List
1
2
3
4
5
10
6
12
7
9
8
Airflow
VAHB Parts List
12
6
Item
No.
Description
1 Drum Weldment
2 Shaft
3 Bearing (2)
4Prop
5 Prop Bushing
6 Belt Tunnel
7 Motor Plate
8 Inner Drum Nose
9Motor
10 Drive Sheave
11 Driven Sheave
12 Belt
Item
No.
9
10
7
1 Drum Weldment
2 Shaft
3 Bearing (2)
4Prop
5 Prop Bushing
Description
6 Belt Tunnel
7 Motor Plate
8 Inner Drum Nose
9 Motor
10 Drive Sheave
11 Driven Sheave
12 Belt
5
Airflow
4
8
2
3
1
9
11
Airflow
2
1
3
4
5
6
7
8
9
10
11
12
AVAD Parts List
1
2
6
4
3
5
Airflow
AVAB Parts List
Item
No.
1 Drum Weldment
2Prop
3 Prop Bushing
4 Motor
5Wiring Box
6 Motor Mounting Bolts
Item
No.
1 Drum Weldment
2Shaft
3 Bearing
4Prop
5 Prop Bushing
6 Motor Plate
7 Inner Drum Nose
8 Motor
9 Drive Sheave
10 Driven Sheave
11 Belt
12 Belt Tunnel (2)
Description
Description
10
Airflow
4
5
3
2
1
Airflow
1
4
2
8
7
9
3
6
5
10
11
12
AFB Parts List
Airflow
1
4
2
8
7
9
3
6
5
10
11
AFBV Parts List
Item
No.
Description
1 Drum Weldment
2 Shaft
3 Bearing
4 Motor Plate
Prop
C-Cast Bushing
H-High Temperature
5
Construction
S-Stainless Steel
Construction
6 Prop Bushing
7 Bearing Cover
8 Motor
9 Drive Sheave
10 Driven Sheave
11 Belt
Item
No.
Description
1 Drum Weldment
2 Shaft
3Bearing
4 Motor Plate
Prop
C-Cast Bushing
H-High Temperature
5
Construction
S-Stainless Steel
Construction
6Prop Bushing
7 Bearing Cover
8 Motor
9 Drive Sheave
10 Driven Sheave
11 Belt
12 Vane Section
AFD-C Parts List
Item
No.
Description
1 Drum Weldment
2 Propeller
3 Prop Bushing
4 Motor
5 Motor Mounting Bolts
11
Airflow
4
5
3
2
1
6
AFDV-C Parts List
Item
No.
1 Drum Weldment
2 Propeller
3 Prop Bushing
4 Motor
5 Motor Mounting Bolts
6 Vane Section
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at the inlet.
•Improper prop alignment.
Description
Excessive Vibration and Noise
•Damaged or unbalanced wheel.
•Belts too loose; worn or oily belts.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Bearings need lubrication or replacement.
•Fan surge.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Cooling air diverted or blocked.
•Improper prop clearance.
•Incorrect fan RPMs.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
Limited Warranty
Loren Cook Company warr ants that y our Loren Co ok fan was ma nufact ured free of defects in materials and workmanship, to the extent stated herein. For a period of one (1)
year after date of shipment, we will replace any parts found to be defective without charge, except for shipping costs which will be paid by you. This warranty is granted only to
the original purchaser placing the fan in service. This warranty is void if the fan or any part thereof has been alter ed or modified fr om its original design or has been abused, misused, damaged or is in worn condition or if the fan has been used oth er than f or the uses described in t he company manua l. Thi s warranty does no t cover defects resul tin g fr om
normal wear and tear. To make a warranty claim, notify Loren Cook Company, General Offices, 2015 East Dale Street, Springfield, Missouri 65803-4637, explaining in writing,
in detail, your complaint and referring to the specific model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notified,
within thirty (30) days of our receipt of your complaint, in writing, as to the manner in which your claim will be handled . If you are e nt itled to war ranty r elief, a warrant y adjustment
will be completed within sixty (60) business days of the receipt of your written complaint by Loren Cook Company. This warranty gives only the original purchaser placing the
fan in service specifically the right. You may have other legal rights which vary from state to state.
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
lorencook.com
12
VA/AVA/AF IOM - AUG 2009
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