Cook CP User Manual download pdf (Page 5)

Fan

Motor

Damper

Motor*

Second

Damper

Motor

Transformer**

Motor

Together

High Speed

Line

Open

Low Speed

Line

Motor

456

Low Voltage

208/230 Volts

High Voltage

460 Volts

3 Phase, 9 Lead Motor

Y-Connection

789

Low Voltage

208/230 Volts

High Voltage

460 Volts

3 Phase, 9 Lead Motor

Delta-Connection

T-1

T-4

Ground B

Ground A

Line

Ground A

Ground B

T-1

T-4

Low Speed

High Speed

Line

Wiring Diagrams

When ground is required, attach to ground A or B with no. 6 thread forming

screw. To reverse, interchange T-1 and T-4.

Single Speed, Single Phase Motor

To reverse, interchange any 2 line leads.

When ground required, attach to ground A or B with No. 6 thread forming

screw. To reverse, interchange T-1 and T-4 leads.

2 Speed, 2 Winding, Single Phase Motor

2 Speed, 1 Winding, 3 Phase Motor

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

Single Speed, Single Phase, Dual Voltage

2 Speed, 2 Winding, 3 Phase

When ground required, attach to ground A or B with No. 6 thread forming

screw. To reverse, interchange T-5 and J-10 leads.

To reverse: High Speed-interchange leads T

and T

Low Speed-interchange leads T

and T

. Both Speeds-interchange any 2

line leads.

Typical Damper Motor Schematic

For 3 phase, damper motor voltage should be the same between L

and

. For single phase application, disregard L

. *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 pro-

vided in some installations to correct the damper motor voltage to the

specified voltage.

Ground B

J-10

T-5

Ground A

Link A

Link B

Low Voltage

Line

Ground A

Link A & B

Line

Ground B

T-5

J-10

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.

NOTICE! 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.

Operation

Pre-Start Checks

1. Lock out all the primary and secondary power

sources.

2. Ensure fasteners and setscrews, particularly those

used for mounting the fan, are tightened.

3. Inspect belt tension and pulley alignment.

4. Inspect motor wiring.

5. Ensure belt touches only the pulleys.

6. Ensure fan and ductwork are clean and free of debris.

7. Inspect wheel-to-inlet clearance. The correct wheel-

to-inlet clearance is critical to proper fan performance.

8. Close and secure all access doors.

9. Restore power to the fan.

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Cook CP User Manual Page 5

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