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