3
CV IO&M
B51161-003
2 Speed, 2 Winding, 3 Phase
L
1
T
1
T
2
T
3
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T
13
T
12
T
11
L
2
Line
L
3
To reverse:
High Speed - interchange leads T
11
and T
12
.
Low Speed - interchange leads T
1
and T
2
.
Both Speeds - interchange any two line leads.
Typical Damper Motor Schematic
Fan
Motor
Damper
Motor*
Second
Damper
Motor
Transformer**
Transformer**
L3
L2
L1
For 3 phase, damper motor voltage should be the same be-
tween L
1
and L
2
. For single phase application, disregard L
3
.
*Damper motors may be available in 115, 230 and 460 volt
models. The damper motor nameplate voltage should be veri-
fied 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
1. Lock out all the primary and secondary power sources.
2. Inspect fasteners and setscrews, particularly those used for
mounting the unit, and tighten if necessary.
3. Inspect belt tension and pulley alignment. (Remember, if
belt tension is correct, a loud squeal occurs as the fan in-
creases to full power.)
4. Inspect motor wiring.
5. Ensure the belt touches only the pulleys.
6. Rotate the prop to ensure it does not rub against the venturi.
7. Ensure fan and ductwork are clean and free of debris.
8. Test the fan to ensure the rotation of the propeller is the
same as indicated by the rotation label.
9. Close and secure all access doors.
10. Restore power to unit.
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 a continuous
squealing noise)
• Improper motor amperage or voltage
NOTICE! If a problem is discovered, immediately shut
off the fan. Lock out all electrical power and check
for the cause of the trouble. Refer to Troubleshooting.
Wiring Diagrams
Single Speed, Single Phase Motor
T-1
T-4
Ground B
L 2
L1
Ground A
Line
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
Ground B
T-1
T-4
Low Speed
High Speed
L1
L2
Line
When ground required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-1 and T-4
leads.
Single Speed, Single Phase, Dual Voltage
Ground B
J-10
T-5
Ground A
Link A
Link B
Low Voltage
Line
L 2
L 1
Ground A
Link A & B
L1
L2
Line
Ground B
T-5
J-10
When ground required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-5 and J-10
leads.
3-Phase, 9 Lead Motor
4 5 6
1
7
2
8
3
9
L1 L2 L3
4 5 6
7 8 9
1 2 3
L1 L2 L3
Low Voltage
208/230 Volts
High Voltage
460 Volts
3 Phase, 9 Lead Motor
Y-Connection
7
1
6
7 8 9
4 5 6
1 2 3
Low Voltage
208/230 Volts
High Voltage
460 Volts
8
2
4
9
3
5
L1
L3
L2
L1
L3
L2
3 Phase, 9 Lead Motor
Delta-Connection
To reverse, interchange any two line leads.
2 Speed, 1 Winding, 3 Phase Motor
Motor
1
2
3
4
5
6
Together
High Speed
Line
L1
L2
L3
1
2
3
4
5
6
Open
Low Speed
Line
L1
L2
L3
Motor
To reverse, interchange any two line leads. Motors require
magnetic control.
