This publication contains the installation, operation
and maintenance procedures for standard units of the
AQ/SEP/ETE/ETS - Propeller Roof Fans.
Carefully read this publication prior to any installa-
tion or maintenance procedure.
Loren Cook catalog,
tional information describing the equipment, fan performance, available accessories and specification data.
For additional safety information, refer to AMCA publication 410-96,
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 and instructions on special equipment,
contact Loren Cook Company at 417/869-6474.
Safety Practices for Users and Installers of
Propeller Roof Fans
.
, provides addi-
Receiving and Inspection
Carefully inspect the fan and accessories for any damage
and shortage immediately upon receipt of the fan.
• Turn the propeller by hand to ensure it turns freely and
does not bind.
• Check dampers (if included) for free operation of all
moving parts.
• Record on the
damage.
Delivery Receipt
any visible sign of
Handling
Lift the fan by the base or by the shipping carton. Never
lift by the shaft, motor or housing.
If your fan is covered with a protective coating (e.g., phe-
nolic enamels, or other protective coatings), handle with
extreme care . Even a small chip will break the coating’s
continuity and destroy its ability to protect the metal.
Propellers are carefully balanced to give smooth, vibration-free operation. If the propeller is damaged during handling, it will require rebalancing.
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 fan.
To maintain good working condition of the fan when it is
stored outdoors or at a construction site, follow the additional instructions below.
• Coat the shaft and bearings with grease or rust preventative compound to help seal out moisture.
• Periodically rotate the propeller and operate the dampers (if supplied) to keep a coating of grease on all internal bearing parts.
• Periodically inspect the fan to prevent damaging conditions.
• Block propeller to prevent natural rotation.
• Cover the unit with some type of weather cover to prevent moisture, corrosion, dirt or dust accumulation.
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.
Installation
Damper Installation
If your fan is supplied with dampers, follow the directions
below. If your fan does not include dampers, proceed to
Motor Installation
a. Place the damper inside the curb. Ensure the damper
will open freely for the correct direction of the airflow.
b. Secure to curb at the damper shelf by installing at least
two sheet metal screws (#10 x 1/2”) on each side of the
damper, through the tray, with the screw head catching
the flange on the damper. This will prevent the exhaust
dampers from lifting and keep the supply dampers centered.
Damper Installation continued
.
Storage
If the fan is stored for any length of time prior to installation, store it in its original shipping crate and protect it from
dust, debris and the weather.
Outdoor Storage
SEP/AQD
1
Page 2
.
c. Drill a hole in the curb shelf for conduit needed for
motor wiring.
d. Operate the dampers manually to ensure the blades
move freely. Dampers should be released from full
open position to check for proper closing.
1/4 inch
1 foot
Figure 1
Motor Installation (Belt Drive fans)
To prevent damage to the fan during shipping, motors 5
HP and larger, and extremely heavy motors (cast iron or
severe duty) are shipped loose and must be field mounted.
a. Remove the motor plate mounting bolts and the motor
plate.
b. Remove the motor mounting bolts from the motor
plate.
c. Mount the motor to the motor plate aligning to the
appropriate holes.
d. Place the motor plate on the power assembly and rein-
stall the mounting bolts.
Correct
Incorrect
c. Lock the motor plate adjustment nuts
in place.
d. Ensure pulleys are properly aligned.
Refer to
Figure 2
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley setscrew and by
moving the motor pulley on the motor
shaft or by moving the entire motor along
the motor mounting bracket.
Figure 2
illustrates correct and incorrect pulley alignment.
Figure 3
A recommended method of inspecting the pulley alignment
is shown in
Figure 3
. With the shorter leg of a carpenter’s
square or other straight edge lying along the case of the
motor, adjust the position of the motor pulley (or the motor)
until the longer leg of the square is parallel to the belt.
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. Refer to the
Wiring Diagrams
on page 3.
Lock off all power sources before unit is wired to power
source.
Leave enough slack in the wiring to allow for motor move-
ment when adjusting belt tension.
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.
IncorrectIncorrect
Figure 2
Belt and Pulley Installation
If your fan is a direct drive, proceed to
Wiring Installation
Belt tension is determined by the sound of the belts when
the fan is first started. The belts will produce a loud squeal,
which dissipates after the fan is operating at full capacity. If
belt tension is too tight or too loose, lost efficiency and
damage can occur.
Do not change the pulley pitch diameter to change tension. The change will result in a different fan speed.
a. Loosen the motor plate adjustment nuts on motor base
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 1
.
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 switch to promote safety (i.e.,
red tape over a closed switch).
Fan Installation
The fan support (roof curb) should provide a level surface
for installation. If the roof is pitched more than 1/2:12, a
sloped curb must be used to correct for the incline.
.
Place fan over roof opening. Secure the fan with lag
screws, anchor bolts, or other suitable fasteners.
Ground B
When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
1
Line
L
2
Wiring Diagrams
3 Phase, 9 Lead Motor
Low Voltage
208/230 Volts
4
6
5
3
1
9
728
L2L
L
3
To reverse, interchange any 2 line leads.
1
High Voltage
2 Speed, 2 Winding, Single Phase Motor2 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
To reverse, interchange any 2 line leads. Motors require magnetic control.
Motor
High Speed
1
Together
2
3
L
4
L
5
6
L
1
2
Line
3
Motor
Single Speed, Single Phase, Dual Voltage2 Speed, 2 Winding, 3 Phase
Ground A
L
Line
L
1
T- 5
J-10
2
Ground B
T- 5
J-10
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.
Link A
Link B
Low Voltage
Ground A
Link A & B
L
1
Line
L
2
Low Speed
T
3
Low Speed
T
2
Low Speed
T
Motor
To reverse: High Speed-interchange leads T
Low Speed-interchange leads T
line leads.
1
T
11
T
12
T
13
High Speed
High Speed
High Speed
and T
1
. Both Speeds-interchange any 2
2
Typical Damper Motor Schematic
460 Volts
456
789
12
L2L
L
1
Low Speed
and T
11
3
3
L
1
1
L
2
2
3
4
5
6
12
Line
L
3
Open
L
1
Line
L
2
L
3
.
Fan
Motor
Transformer**
Damper
Motor*
Second
Damper
Motor
Transformer**
L3
L2
L1
For 3 phase, damper motor voltage should be the same between L
L
. For single phase application, disregard 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.
Final Installation Steps
a. Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners, and tighten according
to the recommended torque shown in the table below,
Recommended Torque for Setscrews/Bolts
b. Inspect for correct voltage with voltmeter.
c. Ensure all accessories are installed.
d. Test the fan to be sure the rotation is the same as indi-
cated by the arrow marked Rotation .
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.
.
and
. *Damper motors may be
3
1
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power sources.
b. Inspect fasteners and setscrews, particularly those
used for mounting the unit, and tighten if necessary.
c. Inspect belt tension and pulley alignment. (Remember,
if belt tension is correct, a loud squeal occurs as the
fan increases to full power.)
d. Inspect motor wiring.
e. Ensure the belt touches only the pulleys.
f. Rotate the propeller to ensure it does not rub against
the base.
g. Ensure fan and ductwork are clean and free of debris.
h. Test the fan to ensure the rotation of the propeller is the
same as indicated by the rotation label.
i. Restore power to unit.
3
Page 4
Start Up
Turn the fan on. In variable speed units, set the fan to its
lowest speed. Inspect for the following:
• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for a continuous squealing noise).
• Improper motor amperage or voltage.
If a problem is discovered, immediately shut off the
fan. Lock out all electrical power and check for the
cause of the trouble. Refer to
Troubleshooting,
page 5.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as per
the chart below.
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.
WARNING
Disconnect power before checking and cleaning
filters. Inadvertent operation of the fan could pull
objects from the roof into the propeller.
Filter
If you fan is not supplied with filters proceed to
.
nance
Inspect filters within the first two weeks of operation. If
there is no excessive build-up, monthly servicing should be
adequate.
To clean reusable aluminum filters, back flush with soap
and water. When clean, shake off excess water and allow
the filter to air-dry before reinstalling it.
Mainte-
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 operation. Fans exhausting contaminated air (airborne abrasives) should be inspected every
three months. Clean the propeller and air inlets if material
build-up is excessive. Excessive build-up can cause imbalance and failure of the propeller.
Regular inspections are recommended for fans exhausting non-contaminated air.
It is recommended the following inspections 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. See
Belt and Pulley Installation
, page 2.
• Bearings should be inspected as recommended in the
Conditions Chart
.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
Lubricants
Loren Cook Company uses petroleum lubricant in a lithium base conforming to NLGI grade 2 consistency. Other
grades of grease should not be used unless the bearings
and lines have been flushed clean. If another grade of
grease is used, it should be lithium-based.
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.
Motor Bearings
Motor bearings are pre-lubricated and sealed. Under
normal conditions they will not require further maintenance
for a period of ten years. However, it is advisable to have
your maintenance department remove and disassemble
the motor, and lubricate the bearings after three years of
operation in excessive heat and or in a contaminated airstream consisting of airborne abrasives.
Conditions Chart
RPMTemperature
100Up to 120˚FClean6 to 12 months
500 Up to 150˚FClean2 to 6 months
1000 Up to 210˚FClean2 weeks to 2 months
1500 Over 210˚FCleanWeekly
Any
Speed
Any
Speed
Any
Speed
Any
Speed
Up to 150˚FDirty1 week to 1 month
Over 150˚FDirtyDaily to 2 weeks
Any TemperatureVery DirtyDaily to 2 weeks
Any Temperature
Fan
Status
Extreme
Conditions
Greasing
Interval
Daily to 2 weeks
Fan Bearings
Fan bearings are lubricated through a grease connector
and should be lubricated by the schedule,
Chart
, shown above.
Conditions
For best results, lubricate the bearing while the fan is
rotating. Slowly pump grease into the bearing until a slight
bead forms around the bearing seals. Excessive grease
can burst seals thus reduce bearing life.
In the event the bearing cannot be seen, use no more
than three injections with a hand-operated grease gun.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook representative or
your nearest authorized electric motor service representative.
4
Page 5
Changing Shaft Speed
All belt driven propeller roof fans with motors up to and
including 5HP 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 the RPM limits
of the fan and the horsepower limits of the motor are maintained.
Pulley and Belt Replacement
a. Clean the motor and fan shafts.
b. Loosen the motor plate mounting bolts to relieve the
belt tension. Remove the belt.
c. Loosen the pulley setscrews and remove the pulleys
from the shaft.
If excessive force is required to remove the pulleys, a three-jaw puller can be used. This tool,
however, can easily warp a pulley. If the puller is
used, inspect the trueness of the pulley after it is
removed from the shaft. The pulley will need
replacement if it is more than 0.020 inch out of
true.
d. Clean the bores of the pulleys and place a light coat of
oil on the bores.
e. Remove grease, rust and burrs from the shaft.
f. Place fan pulley on the fan shaft and the motor pulley
on the motor shaft. Damage to the pulleys can occur
when excessive force is used in placing the pulleys on
their respective shafts.
g. After the pulleys have been correctly placed back onto
their shafts, tighten the pulley setscrews.
h. Install the belts on the pulleys. Align and adjust the
belts to the proper tension as described in
ley Installation
, page 2.
Belt and Pul-
Bearing Replacement
The fan bearings are pillow block ball bearings.
a. Remove the top cap to gain access to the fan.
b. Loosen the motor plate mounting bolts and remove the
drive belts.
c. Remove the propeller from the shaft.
d. Remove the four (4) bearing hold-down bolts and then
remove the shaft and bearings from the fan as an
assembly.
e. Measure and record the location of the bearings on the
shaft. This will aid the reassembly.
f. Loosen the bearing setscrews and remove the bear-
ings from the shaft.
g. Remove any imperfections in the shaft using a smooth
file or emery cloth.
h. Place new bearings on the shaft.
i. Locate one of the bearings using the previous mea-
surements and tighten one setscrew.
j. Install the propeller on the shaft. Center the propeller in
the opening and tighten the bearing bolts.
k. Rotate the propeller to allow the bearings to find their
center of free movement.
l. Align the bearing setscrews and tighten to proper
torque. Refer to the
Torque chart
on page 2.
m. Reassemble drive assembly and replace top cap.
Propeller and Shaft Replacement Precautions
• If the shaft is dropped and bent, it may cause unbalanced operation of the fan.
• When handling the propeller separately from the shaft,
place a support through the hub for lifting, making sure
not to injure the finished bore of the propeller.
• Never allow the propeller to rest its entire weight on the
blades. The propeller and shaft can be lifted by slings
around the shaft on each side of the propeller so the
propeller is supported by its hub.
• If using a chain to lift the propeller, make sure there is
sufficient padding on the shaft and propeller. This prevents the scoring of the shaft or injury to the propeller.
The chain or cable should be spread with timbers, or
braced by some other method to prevent damage to the
propeller side plates.
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 propeller alignment.
Excessive Vibration and Noise
•Damaged or unbalanced propeller.
•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.
Loren Cook Company warrants that your Loren Cook fan was manufactured 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 altered or modified from its original design or has been abused, misused, damaged or is in worn condition or if
the fan has been used other than for the uses described in the company manual. This warranty does not cover defects resulting from 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 entitled to warranty relief, a warranty 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
www.lorencook.com
AQ/SEP/ETE/ETS IOM - January1999
8
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