This publication contains the installation, operation and mainte-
nance instructions for standard units of the ACSC-Smoke Control
Ventilator .
• ACSC/ACSC-HP/ACSC-XP
Carefully read this publication prior to any installation or main-
tenance procedure.
Loren Cook catalog, AC , provides additional information describing
the equipment, fan performance, available accessories, and specifica-
tion 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 and instructions on special equipment, contact Loren
Cook Company at (417)869-6474.
Receiving and Inspection
Immediately upon receipt of an AC fan, carefully inspect the fan and
accessories for damage and shortage.
• Turn the wheel by hand to ensure it turns freely and does not bind.
• Record on the Delivery Receipt any visible sign of damage.
Handling
Lift the fan by the shipping carton or lifting lugs
provided under top cap. Never lift by the shaft,
motor or housing.
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.
Damper
Use of any backdraft dampers is NOT permitted. Fire dampers and/or smoke dampers may be required in a smoke
control system. These dampers must meet the requirements determined by the local code authority.
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.
Installation
If the fan was delivered with the motor unmounted, see the mainte-
nance section for belt and pulley installation.
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 , next page.
Lock off all power sources before the fan 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.
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.
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).
Final Installation Steps
a. Ensure fasteners and set screws, particularly fan mounting and
bearing fasteners are tightened according to the recommended
Lifting Lugs
torque shown in the table on page 2, Recommended Torque for
Setscrews/Bolts.
b. Inspect for correct amperage with an ammeter and correct voltage
with a voltmeter.
c. Ensure that all accessories are installed.
d. Test the fan to be sure the rotation is the same as indicated 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.
e. Inspect wheel-to-inlet clearance. Wheels may shift in shipment. To
realign wheel-to-inlet, shift upper bearing so there is an equal
radial clearance between the wheel and inlet.
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.
ACSC fan is intended for general ventilation, and is UL listed for
Smoke Control Systems. The fan should not be used to exhaust corrosive or contaminated air.
Regular, twice per year, inspections are recommended and may be
required per local codes.
Contact the local code authority for inspection requirements.
• Inspect bolts and setscrews for tightness. Tighten as necessary.
Refer to Torque chart .
• Inspect belt wear and alignment. Replace worn belts with new belts
and adjust alignment as needed. Refer to Belt and Pulley Installa-
tion, page 3.
• 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.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power sources.
b. Inspect and tighten fasteners and setscrews, particularly fan
mounting and bearing fasteners Refer to Torque chart .
c. Inspect belt tension and pulley alignment. Refer to Belt and Pulley
Installation , page 3.
d. Inspect motor wiring. Refer to Wiring Installation .
e. Ensure belt touches only the pulleys.
f. Rotate the wheel to ensure it rotates freely.
g. Ensure fan and ductwork are clean and free of debris.
h. Close and secure all access doors.
i. Restore power to fan.
ACSC
Page 2
2
e
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
T-1
T-4
Ground B
When ground is required, attach
to ground A or B with no. 6 thread
forming screw. To reverse, inter-
L
change T-1 and T-4.
1
Line
L
2
2 Speed, 2 Winding, Single 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
Low Speed
L
1
Line
L
2
Single Speed, Single Phase, Dual Voltage
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
Line
L
1
2
Start-up
Turn on the fan. 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 squealing)
• Improper motor amperage or voltage
If a problem is discovered, immediately shut the fan off. Lock out
all electrical power and check for the cause of the trouble. Refer to
Troubleshooting on page 4.
Inspection
Inspection of the fan should be conducted at the first 30 minute , 8
hour and 24 hour intervals of satisfactory operation. During the inspec-
tions, stop the fan and inspect as instructed.
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.
Recommended Torque for Setscrews/Bolts (IN/LB)
Size
No.103/32”28333/8”-16240
1/4”1/8”66801/2”-13600
5/16”5/32”1261565/8”-111200
3/8”3/16”2282753/4”-102100
7/16”7/32”293487/8”-92040
1/2”1/4”42504
5/8”5/16”921104
3/4”3/8”1201440
Setscrews
Key Hex
Across
Flats
Recommended
Min.Max.Size
Hold Down Bolts
Wrench
Torque
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
3
1
9
728
L2L
L
1
3
High Voltage
460 Volts
456
789
12
L
1
3
L2L
3
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
L
L
1
2
L
3
9
5
3
High Voltage
460 Volts
789
456
12
L1L
3
L
3
2
To reverse, interchange any 2 line leads.
2 Speed, 1 Winding, 3 Phase Motor
Motor
Low Speed
1
2
3
4
5
6
L
1
L
2
L
3
Open
Lin
High Speed
1
Together
2
Motor
3
L
4
1
L
5
2
6
Line
L
3
To reverse, interchange any 2 line leads. Motors require magnetic control.
2 Speed, 2 Winding, 3 Phase
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
High Speed
T
11
High Speed
T
12
High Speed
T
13
and T
. Both Speeds-interchange any 2
1
2
11
and T
.
12
L
1
Line
L
2
L
3
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 or in a contaminated airstream consisting
of airborne abrasives.
Fan Bearings
Fan bearings are lubricated through a grease connector and should
be lubricated by the schedule, Conditions Chart.
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.
Conditions Chart
RPMTemperatureFan StatusGreasing Interval
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
Extreme
Conditions
Daily to 2 weeks
Page 3
3
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.
Changing Shaft Speed
All belt driven ventilators (5HP or less) are equipped with variable
pitch pulleys. To change 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.
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 any grease, rust or burrs from pul-
leys.
f. Place the 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 plac-
1/4 inch
ing the pulleys on their respective
shafts.
1 foot
g. After the pulleys have been cor-
rectly placed back onto their
shafts, tighten the pulley setscrews.
Figure 1
Belt and Pulley 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 may occur.
Do not change the pulley pitch diameter to change tension. The
change will result in a different fan speed.
a. Loosen motor plate adjustment bolts and slide motor plate so that
belts easily slip into the grooves on the pulleys. Never pry, roll, or
force the belts over the rim of the pulley.
b. Slide 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 .
c. Lock the motor plate adjustment bolts 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.
Figure 2 illustrates correct and incorrect pulley alignment. A recom-
mended 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.
Correct
IncorrectIncorrect
Figure 2
Incorrect
Bearing Replacement
The fan bearings are pillow block type ball bearings.
a. Remove the old bearing.
b. Remove any burrs from the shaft by sanding.
c. Slide new bearings onto the shaft to the desired
location and loosely mount bearings onto the
bearing support. Bearing bolts and setscrews
should be loose enough to allow shaft positioning.
d. Correctly position the wheel and tighten the bear-
ing bolts securely to the bearing support.
e. Align setscrews bearing to bearing and secure
Figure 3
tightly to the shaft.
Never tighten both pairs of setscrews before securing bearing
mounting bolts. This may damage the shaft .
f. Inspect the wheel position again. If necessary, readjust by loosening
the bearing bolts and setscrews and repeat from step e.
Wheel Replacement
a. Drill two holes approximately centered between the shaft and the
edge of the hub OD with the following dimensions:
• 1/4" diameter
• 3/8" to 1/2" deep
• 180˚ apart in face of hub
b. Tap 1/4" holes to 5/16" thread with the 5/16" hole tap. Do not drill or
tap any larger than recommended.
• 1/4" diameter
• 3/8" to 1/2" deep
• 180˚ apart in face of hub
c. Tap 1/4" holes to 5/16" thread with the 5/16" hole tap. Do not drill or
tap any larger than recommended.
d. Screw the puller arms into the tapped holes full depth of threads (3/
8" to 1/2" approximately). Align center of puller with center of shaft.
Make certain all setscrews in hub (normally a quantity of two) are fully
removed. Work puller slowly to back wheel off the shaft.
Recommended Puller
Lisle No. 45000 Sterling Wheel Puller. This puller is available at most auto-
motive parts retail outlets.
Above - Drilled hole placement.
Right - Wheel puller.
Page 4
1A
2
18
20
19
16
17
15
3
21
1B
10
23
4
ACSC Parts List
Part
No.
1aTop Cap LidTop Cap LidTop Cap Lid
1bTop Cap CylinderTop Cap CylinderTop Cap Cylinder
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.
11
7
12
13
5
8
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 wheel alignment.
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 inlet clearance.
•Incorrect fan RPMs.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
LOREN COOK COMPANY
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
lorencook.com
4
ACSC IOM - November 2002
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