INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance procedures for standard units of the VCR,
VCRD, VCR-HP, VCRD-HP, VCR-XP, & VCRD-XP
Centrifugal Roof and Wall Exhausters.
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook Company’s VCR catalog 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.
VCR
Centrifugal Roof and Wall Exhausters
The attachment of roof mounted fans to the roof curb
as well as the attachment of roof curbs to the building
structure must exceed the structural requirements
based on the environmental loading derived from the
applicable building code for the site. The local code
official may require variations from the recognized
code based on local data. The licensed engineer of
record will be responsible for prescribing the correct
attachment based on construction materials, code
requirements and environmental effects specific to
the installation.
Failure to follow these instructions could result in
death or serious injury.
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.
Rotating Parts & Electrical Shock Hazard:
Disconnect electric power before working on unit.
Follow proper lockout / tagout procedures to ensure
the unit cannot be energized while being installed or
serviced.
A disconnect switch should be placed 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.
Grounding is required. All field-installed wiring must
be completed by qualified personnel. All fieldinstalled wiring must comply with National Electric
Code (NFPA 70) and all applicable local codes.
Failure to follow these instructions could result in
death or serious injury.
Receiving and Inspection
Immediately upon receipt of a VCR 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 lifting lugs provided under top cap.
NOTICE! Never lift by the shaft, motor or housing.
Installation
If the fan was delivered with the
motor unmounted, see the maintenance sections for belt and pulley
installation.
If the fan was purchased as a wall
mount unit and a grease terminator or grease trough was
not purchased, a 1-1/16 inch diameter drain hole should be
inserted on the bottom side of the unit for drainage.
Fan Installation
a. Ensure the fan discharge is a minimum 40 inches
above the roof surface and a minimum of 10 foot from any
building air intake in order to comply with NFPA 96.
Lifting Lugs
b. Minimum exhaust velocity in the duct should be 1500
FPM in accordance with NFPA 96.
c. If the fan is installed on a surface that is not level, install
the fan in a position that places the drain tube at the
lowest position.
d. Secure the fan to the roof curb at all four corners using
a minimum of four anchor bolts, lag screws or other
suitable fastener.
All wires must be protected from abrasion when
passing through the opening of a field wiring
compartment.
Do not use cooling tubes for electrical connections.
Do not use vertical conduit if fan will be used in a
grease and/or heat exhaust application, use of the
vertical conduit does not conform to NFPA 96 and UL
762.
Failure to follow these instructions could result in
death or serious injury.
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 following Wiring Diagrams.
Upblast units have two wiring conduits. The vertical conduit comes plugged. The horizontal conduit is directly above
vertical conduit.
Lock off all power sources before the fan is wired to power
source.
NOTICE! 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 With a Junction Box
a. Wire the motor using the junction box located on the
outside of the fan.
b. Reinstall the junction box cover and ensure that the
gasket forms a complete seal.
Fan Without a Junction Box
A field wiring compartment must be installed for wire connections. Wire the motor by pulling the electrical wire
through the conduit. For further information refer to the
National Electrical Code and the wiring diagram provided on
the motor.
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, interchange T-1 and T-4.
L
1
Line
L
2
2 Speed, 2 Winding, Single Phase Motor
When ground required,
attach to ground A or B
with No. 6 thread forming
screw. To reverse, inter-
L
1
change T-1 and T-4
Line
leads.
L
2
T-1
T-4
Ground B
Ground A
High Speed
Low Speed
Single Speed, Single Phase, Dual Voltage
Ground A
L
L2L
1
T-5
Line
J-10
L
2
Ground B
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
7
6
1
3
3
L
1
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
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
3
1
9
728
L2L
L
1
To reverse, interchange any 2 line leads.
3
High Voltage
460 Volts
456
789
12
L
1
Ground A
L
789
456
3
L
2
3
Line
L
1
2
Link A & B
High Voltage
9
8
5
4
3
2
L
3L2
460 Volts
12
L1L
2 Speed, 2 Winding, 3 Phase
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2 line leads
Typical Damper Motor Schematic
Fan
Motor
Transformer**
Damper
Motor*
For 3 phase, damper motor voltage should be the same between L1 and L2. For single
phase application, disregard L3. *Damper motors may be 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.
Second
Damper
Motor
L3
L2
L1
Transformer**
VCRD with Shade Pole or PSC Motors
White Line
Black Line
2
VCRD with 2-Speed PSC Motors
White Line
Black (High)
Red (Low)
NOTE: Insulate Unused Lead
FSC - 115 VOLT 10 AMP
VCR
FAN*
FSC
VCR
FAN*
*See VCR Wiring Diagram for correct lead.
†
Locate away from heat.
*
*
WHITE
BLAC
Grease Terminator Installation
PVC
Extension
Lid
Sealing Nut
Terminator
Fan Inlet Side
Sealing Nut
Final Installation Steps
1. Ensure fasteners and setscrews, particularly fan
mounting and bearing fasteners, are tightened according to the recommended torque shown in the table
below, Recommended Torque for Setscrews/Bolts.
2. Inspect for correct voltage with voltmeter.
3. Ensure all accessories are installed.
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Size
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 348 384 7/8”-9 2040
1/2” 1/4” 504 600 1”-8 3000
5/8” 5/16” 1104 1200 1-1/8”-7 4200
3/4” 3/8” 1440 1800 1-1/4”-7 6000
Key Hex
Across
Flats
Recommended
Torque Inch-lbs.
Min. Max. Size
Hold Down Bolts
Wrench
Torque (inch-lbs)
Line
4. Test the fan to be sure the rotation is the same as
indicated by the arrow marked ‘rotation’.
NOTICE! 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.
5. 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.
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power
sources.
2. Inspect and tighten fasteners and setscrews, particularly fan mounting and bearing fasteners. Refer to
Torque chart.
3. Inspect belt tension and pulley alignment. Refer to
Belt and Pulley Installation, page 5.
4. Inspect motor wiring. Refer to Wiring Installation,
page 2.
5. Ensure belt touches only the pulleys
6. Rotate the wheel to ensure it rotates freely.
7. Ensure fan and ductwork are clean and free of
debris.
8. Close and secure all access doors.
9. Restore power to fan.
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 squeal-
ing)
• Improper motor amperage or voltage
NOTICE! 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 Trouble-
shooting, page 6.
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 instructed 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.
3
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.
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. 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 Installation, page 5.
• Bearings should be inspected as recommended in the
Conditions Chart, page 4.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
Grease Terminator
Regular inspections of the Grease Terminator 2 are recommended. Depending on the amount of grease discharged through the fan, the Grease Terminator 2 should
be changed every 30 to 45 days to ensure proper operation. Any buildup of grease is easily seen during a visual
inspection of the clear canister. However, if the Grease Terminator 2 becomes saturated, grease will no longer be
absorbed.
To replace the Grease Terminator, simply unscrew the
used canister and screw on a new one.
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 -30F to +200F and capable of intermittent highs of +250F.
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.
Relubrication Intervals
NEMA Frame Size
Up to and
Service
Conditions
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
including 184T
1800 RPM
and less
Over 1800
RPM
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Fan Bearings
Fan bearings are lubricated through the grease fitting and
should be lubricated by the schedule, Conditions Chart,
shown below.
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.
RPM Temp °F Greasing Interval
Up to 1000
1000 to 3000
Over 3000
Any Speed < -30 Consult Factory
Any Speed > 200 1 week
For moist or otherwise contaminated installations; divide the interval by a
factor of 3. For vertical shaft installations divide the interval by a factor of 2.
-30 to 120 6 months
120 to 200 2 months
-30 to 120 3 months
120 to 200 1 month
-30 to 120 1 month
120 to 200 2 weeks
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 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.
4
Maximum RPM
1 foot
1/4 inch
VCR VCR-HP
Standard Reinforced Standard Reinforced
Size
100 2002 120 1671 135 1574 150 1520 - 1952 165 1295 - 1728 - 2508
180 1546 - 1829 - 2396
195 1353 - 1570 - 2100
210 1227 - 1626 - 2126
225 1086 - 1435 - 1879
245 901 - 1185 1234 1616
270 766 - 1025 1049 1656
300 837 877 980 1046 1391
330 716 748 830 912 1182
365 624 659 735 872 1132
402 539 560 445 463 473
490 360 403
VCR-XP
Replacing Pulleys and Belts
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 pulleys.
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.
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 can 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 move motor plate so that the belts easily slip into
the grooves on the pulleys. Never pry , roll, or force the
belts over the rim of the pulley.
b. Slide the motor plate back until proper tension is
Figure 1
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 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. Figure 3 illustrates using a carpenter’s
square to adjust the position of the motor pulley until the
belt is parallel to the longer leg of the square.
Figure 2
Center Distance
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
OFFSET ANGULAR OFFSET/ANGULAR
A
W
B
CENTER
DISTANCE
(CD)
GAP
Figure 3
X
Y
Z
Maximum
Gap
GAP
5
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 loca-
tion 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 bearing
bolts securely to the bearing support.
e. Align setscrews bearing to bearing and secure tightly
to the shaft.
NOTICE! 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.
g. Test run the fan.
h. Retighten setscrews on bearings, sheave and wheel.
Recheck belt tension and adjust as needed.
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.
c. 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 automotive parts retail outlets.
Wheel Replacement Components
ing for correct overlap.
Adjust the overlap by loosening the wheel hub and mov-
ing the wheel along the shaft to obtain the correct value.
A uniform radial gap
(space between the edge of
the cone and the edge of the
inlet) is obtained by loosening the inlet cone bolts and
repositioning the inlet cone.
Size Overlap
100 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”
445 - 490 1/2”
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.
Above - Drilled hole placement.
Right - Wheel puller.
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be verified before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet draw-
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.
6
Parts List
VCR/VCR-HP/VCR-XP Parts
1a
1b
3
12
21
20
4
13
23
10
11
17
22
VCRD/VCRD-HP/VCRD-XP Parts
19
18
16
14
Part
No.
1a Top Cap Lid Top Cap Lid Top Cap Lid
2
15
8
24
9
5
6
7
1b Top Cap Cylinder Top Cap Cylinder Top Cap Cylinder
2 Top Cap Clip (4) Top Cap Clip (4) Top Cap Clip (8)
3 Motor Motor Motor
4 Spun Motor Plate Spun Motor Plate Spun Motor Plate
5 Baffle Baffle Baffle
6 Wheel Assembly Wheel Assembly Wheel Assembly
7 Base Base Base
8 Conduit Conduit Conduit
9 Isolator (4) Isolator (4) Isolator (4)
10 Upper Post (4) Upper Post (4) Upper Post (8)
11 Lower Post (4) Lower Post (4) Lower Post (8)
12 Wind Band Wind Band Wind Band
13 Brace (4) Brace (4) Brace (8)
14 Power Assembly Power Assembly Power Assembly
15 Shaft Shaft Shaft
16 Bearing (2) Bearing (2) Bearing (2)
17 Drive Sheave Drive Sheave Drive Sheave
18 Driven Sheave Driven Sheave Driven Sheave
19 Belt Set Belt Set Belt Set
20 Vent Tube Vent Tube Vent Tube
21 Grommet (2) Grommet (2) Grommet (2)
22 — Cut Off (HP & XP Only ) Cut Off (HP & XP Only )
23 Insulation Insulation Insulation
24 NEMA 3 Junction Box NEMA 3 Junction Box NEMA 3 Junction Box
VCR/VCR-HP/VCR-XP Parts Description
100-225 245 270-490
15
14
12
1a
3
Part
No.
2
1b
1a Top Cap Lid
1b Top Cap Cylinder
9
7
4
5
13
6
10
11
8
10 Upper Post (4)
12 Wind Band
13 Brace (4)
14 Vent Tube (2)
15 Grommet (4)
7
VCRD/VCRD-HP/
VCRD-XP Parts
Description
100-195
2 Top Cap Clip (4)
3 Motor
4 Spun Motor Plate
5 Baffle
6 Wheel Assembly
7 NEMA 3 Junction Box
8 Base
9 Conduit
11 Lower Post (4)
Limited Warranty
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.
For fans provided with motors, the motor manufacturer warrants motors for a designated period stated in the manufacturer’s warranty. Warranty periods vary from manufacturer
to manufacturer. Should motors furnished by Loren Cook Company prove defective during the designated period, they should be returned to the nearest authorized motor service station. Loren Cook Company will not be responsible for any removal or installation costs.
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
lorencook.com
8
VCR IOM - Feb. 2014
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