COOK CV User Manual

CV

Centri-Vane® Aluminum Inline and Roof Fans

INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

This publication contains the installation, operation and
maintenance instructions for standard units of the CV, Centri­Vane® Aluminum Inline and Roof Fans.

• CVD / CVB, CVR / CVR-S, CV/UCV-S, CVS

Carefully read this publication and any supplemental
documents prior to any installation or maintenance
procedure.

Loren Cook CV catalog provides additional information
describing the equipment, fan performance, available accessories,
and specification data.

For additional safety information, refer to AMCA publication 410­96, 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 [phone], extension 166; by FAX
at [phone]; or by e-mail at [e-mail].

For information and instructions on special equipment, contact
Loren Cook Company at 417.869-6474.

To maintain good working condition of a CV 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 wheel and operate dampers (if supplied)

to keep a coating of grease on all internal bearing parts.

Installation

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 by bolting the motor on
the motor mounting plate in the existing mounting slots.

Receiving and Inspection

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.

UCV 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. If the unit is installed on a
non-level surface, the damper door pivot should be positioned
perpendicular to the peak of the roof.

Place fan over roof opening. Secure the fan with lag screws,
anchor bolts, or other suitable fasteners.

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.

Carefully inspect the fan and accessories for any damage and

shortage immediately upon receipt of the fan.

• Turn the wheel by hand to ensure it turns freely and does not
bind.

• Inspect dampers for free operation of all moving parts.

• Record on the Delivery Receipt any visible sign of damage.

Handling

Lift the fan by the outside housing (box) and support bracket.

Never lift by the shaft or motor.

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.

CVB

Wiring Installation

Pulley Alignment

NOTICE! 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

loosening the motor pulley setscrew and
by moving the motor pulley on the motor
shaft.

in accordance with the motor nameplate. Refer to the

Wiring Diagrams, on page 3.
NOTICE! Lock off all power sources before unit is wired to
power source.

Direct drive - Wire the electrical box on the blower housing.
Belt drive - The motor can be wired directly since the motor is

external to the fan.

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

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.

Final Installation Steps

motor base to power assembly. Do not remove motor mounting
bolts.

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 identify the closed switch to promote
safety (i.e., red tape over a closed switch).

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

1/4 inch

1 foot

Figure 1

Wheel Rotation

same as indicated by the arrow marked Rotation.

115 and 230 Single Phase Motors

Changing the rotation of this type of motor should only be
attempted by a qualified electrician.

208, 230, and 460, 3 Phase Motors

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.

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.

a. Loosen motor plate adjustment bolts and slide motor

plate so 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. Slide motor plate back until proper tension is reached.

For proper tension, a deflection of approximately 1/4”
per foot of center distance should be obtained by

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.

firmly pressing the belt. Refer to Figure1.
c. Lock the motor plate adjustment bolts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.

Pulley alignment is adjusted by

Figure 2 indicates where to measure

Figure 3

1. Ensure that all accessories are installed.

2. Ensure that the blower is secured to ductwork.

3. Inspect wheel-to-inlet clearance. Ensure wheel does
not rub against the inlet.

4. Test the fan to ensure the rotation of the wheel is the
same as indicated by the rotation label.

5. Inspect for correct amperage with an ammeter and
correct voltage with a voltmeter.

Test the fan to ensure the rotation of the wheel is the

Fan wheel rotation is set correctly at the factory.

These motors are electrically reversible by switching two

NOTICE!

Do not allow the fan to run in the wrong

Tolerance

Center Distance

Up thru 12” 1/16”

12” up through 48 1/8”

Over 48” 1/4”

Figure 2

Maximum

Gap

OFFSET ANGULAR OFFSET/ANGULAR

A

W

B

CENTER

DISTANCE

(CD)

GAP

X
Y

Z

GAP

2

Wiring Diagrams

Single Speed, Single Phase Motor

When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.

2 Speed, 2 Winding, Single Phase Motor

Ground A

T-1

T-4

When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.

Ground B

Single Speed, Single Phase, Dual Voltage

Ground A

L

Line

L

1

T-5

J-10

2

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

Typical Damper Motor Schematic

Ground B

High Speed

L

1

L

2

Low Speed

Ground A

Link A & B

Line

L

Line

L

1

2

Wiring Diagrams

3 Phase, 9 Lead Motor
Y-Connection

Low Voltage

208/230 Volts

4

5

6

1
728

To reverse, interchange any 2 line leads.

3
9

L2L

L

3

1

High Voltage

460 Volts

456

789

12

L2L

L

1

2 Speed, 1 Winding, 3 Phase Motor

High Speed

1

Together

2

Motor

To reverse, interchange any 2 line leads. Motors require magnetic control.

3

L

4

1

L

5

2

6

Line

L

3

2 Speed, 2 Winding, 3 Phase

To reverse: High Speed-interchange leads T
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.

3 Phase, 9 Lead Motor
Delta-Connection

Low Voltage

3

3

208/230 Volts

7
6

1

L

1

Motor

8
4
2

L

L

3

2

Low Speed

1
2
3

4
5

6

and T12.

11

9
5

3

High Voltage

460 Volts

789
456

12

L

1

L

1

L

2

Line

L

3

Open

3

L

L

2

3

Fan

Motor

Transformer**

Damper

Motor*

Second
Damper

Motor

L3
L2
L1

Transformer**

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.

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.
d. Inspect motor wiring.
e. Ensure fan and ductwork are clean and free of debris.
f. Close and secure all access doors.
g. 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.

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 chart below.

30 Minute Interval

Inspect bolts, setscrews, and motor mounting bolts.
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.

• 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. 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 lithium-based
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.

Fan Bearings

The fan bearings are provided prelubricated. Any
specialized lubrication instructions on fan labels
supersedes information provided herein. Bearing grease is
a petroleum lubricant in a lithium base conforming to a
NLGI #2 consistency. If user desires to utilize another type
of lubricant, they take responsibility for flushing bearings
and lines, and maintaining a lubricant that is compatible
with the installation.

A NLGI #2 grease is a light viscosity, low-torque, rust­inhibiting lubricant that is water resistant. Its temperature
range is from -30°F to 200°F and capable of intermittent
highs of 250°F.

Bearings should be relubricated in accordance with the

Conditions Chart

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

condition chart below.

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 damage
seal and reduce life through excess contamination and/or
loss of lubricant.

In the event that the bearing cannot be seen, use no
more than three injections with a hand operated grease
gun.

Motor Bearings

Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.

Direct Drive 1050/1075,1200,1300 &1500 rpm units use
a prelubricated sleeve bearing that has a oil saturated
wicking material surrounding it. The initial factory
lubrication is adequate for up to 10 years of operation
under normal conditions. However, it is advisable to add
lubricant after 3 years. Use only LIGHT grade mineral oil or
SAE 10W oil up to 30 drops. If the unit has been stored for
a year or more it is advisable to lubricate as directed above.
For VCR direct drive units and other units in severe
conditions, lubrication intervals should be reduced to half.

Motors without sleeve bearings (as described above) will
have grease lubricated ball or roller bearings. Motor
bearings without provisions for relubrication will operate up
to 10 years under normal conditions with no maintenance.
In severe applications, high temperatures 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
intervals of the table below.

Relubrication Intervals

NEMA Frame Size

Service

Conditions

Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months

Severe 1 yr. 3 months 1 yr. 3 months6 months 1 months

Up to and

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

Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatible 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 one-year
period, contact your local Loren Cook representative or
your nearest authorized electric motor service
representative.

Changing Fan Speed

All belt driven fans with motors up to and including 5 HP

are equipped with variable pitch pulleys.

4

a. Loosen setscrew on motor pulley.
b. Open or close the groove facing to change the pitch

diameter.

Speed Reduction - Open the pulley in order that the

belt rests deeper in the groove.

Speed Increase - Close the pulley in order that the belt
rests higher in the groove. Ensure RPM limits of the fan
and the horsepower limits of the motor are maintained.

c. Retighten pulley setscrew on one of the flat areas of

the motor shaft.

d. After the adjustment is made, check for proper belt

tension. See the Belt and Pulley Installation section.

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.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its

shaft.

Do not hammer the pulleys onto the shafts because
this may damage the bearings.

g. Tighten in place.
h. Install belts on pulleys and align as described in the

Belt and Pulley Installation section.

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

Min. Max. Size

Hold Down Bolts

Wrench

Torque

i. Replace the hub plate and wheel, align properly and

then tighten bearing hold-down bolts securely to the
bearing supports.

j. Align setscrews bearing to bearing and secure tightly to

the shaft.

Never tighten both pairs of setscrews before securing

bearing mounting bolts. This may damage the shaft.
k. Reassemble the unit.
l. Inspect the wheel position again. If necessary, readjust

by loosening the bearing bolts and setscrews and

repeat from step e.

Hub Removal

a. Drill two 1/4” diameter holes, 180 apart centered

approximately between the shaft and the outside

diameter of the hub, 3/8” to 1/2” in depth.
b. Tap 1/4” holes to 5/16” thread with a 5/16” hole tap. Do

not drill or tap greater than recommended.
c. Screw the puller arms to the full depth of the threads

into the tapped holes. Align center of the puller with the

center of the shaft. Ensure all setscrews in the hub,

normally two, are fully removed.
d. Slowly remove wheel from the shaft.

Recommended Puller

Lisle No. 45000 Sterling Wheel Puller. This puller is

available at most automotive parts retail outlets.

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.

Bearing Replacement

The fan bearings are flange ball bearings.

a. Loosen the motor plate adjustment bolts, then slide

the motor plate so the belt will easily slip off.
b. Remove the driven pulley by loosening the setscrew.
c. Separate the outer housing halves.
d. Remove wheel, then loosen the setscrews on the hub

that holds the shaft and remove the hub plate. (Refer

to hub removal instructions below.)
e. Remove the bolts next to the straightening vanes and

pull the inner housing out.
f. Loosen the bearing setscrews and hold-down bolts,

then slide shaft out.
g. Sand the burrs on the shaft where the setscrews were

located.
h. 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.

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.

Overheated Bearings

•Improper bearing lubrication

•Excessive belt tension.

5

CVD Parts List

CVB Parts List

2

2

1

1

8

8

7

7

6

6

Air Flow

Air Flow

1

12

11

10

9

Air Flow

3

3

4

4

5

5

2

3

4

5

6

7

8

Part

No.

1 Outer Discharge Housing
2 Straightening Vanes
3 Motor Plate
4 Wheel Assembly
5 Outer Inlet Housing
6 Support Leg
7 Rubber Channel Isolator
8 Motor

Parts No.

1 Belt Set
2 Motor
3 Motor Plate
4 Motor Plate Saddle
5 Wheel Assembly
6 Bearings
7 Bearing Plate
8 Outer Inlet Housing
9 Support Legs

10 Rubber Channel Isolator

11 Shaft

12 Outer Discharge Housing

Part Description

Sizes 70-180

Part Description

Sizes 12-36

CVS Parts List

2

1

3

2

1

4

11

Air Flow

5

6

7

8

9

10

Parts No.

1 Saddle
2 Motor Plate
3 Motor
4 Outer Discharge Housing with Flange
5 Belt
6 Inlet Housing with Flange
7 Wheel Blades
8 Hub
9 Bearings

10 Shaft

11 Mounting Bracket

Part Description

Sizes 12-36

6

CVR Parts List

2

1

12

11

10

Air Flow

Parts No.

3

5

4

6

7

9

8

1 T opcap Assembly
2 Post
3 Outer Discharge Housing
4 Belt Set
5 Belt Guard
6 Motor
7 Motor Plate
8 Motor Plate Saddle

9 Wheel Assembly
10 Bearing Plate
11 Outer Inlet Housing
12 Bearings

Part Description

Sizes 10-36

CVR-S Parts List

2

1

12

11
10

9

Air Flow

3

4

5

6

7

8

Parts No.

1 Topcap Assembly
2 Post
3 Wheel Assembly
4 Motor Plate Saddle
5 Motor Plate
6 Motor
7 Belt Guard
8 Belt Set
9 Outer Discharge Housing

10 Bearings

11 Outer Inlet Housing

12 Bearing Plate

Part Description

Sizes 10-36

7

UCV Parts List

1

13

12

11

10

Air Flow

UCV-S Parts List

13

12

11

10

8

9

Parts No.

1 Damper Assembly

2

3

4

5

6

7

8

9

1

2

6

7

3

4

5

2 Outer Discharge Housing
3 Belt Set
4 Belt Guard
5 Motor
6 Motor Plate
7 Motor Plate Saddle
8 Bearing Plate

9 Wheel Assembly
10 Base
11 Outer Inlet Housing
12 Bearings
13 Shaft

Parts No.

1 Damper Assembly

2 Motor Plate Mount

3 Motor

4 Weather Cover

5 Belt Set

6 Main Housing

7 Bearing Plate

8 Wheel Assembly

9 Base

10 Outer Inlet Housing
11 Bearings
12 Shaft
13 Outer Discharge Housing

Part Description

Sizes 10-36

Part Description

Sizes 10-36

Air Flow

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 five (5)
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

lorencook.com

8

CV IOM - November 2013