9
SQN IO&M
B51141-004
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.
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.
Parts Lists
SQN-B/SQN-HP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Airflow
16
17
18
Part
No.
Description
Sizes 60 - 165
Sizes 180 - 210
Sizes 225 - 402
1
L-Bolt (2)
L-Bolt (2)
L-Bolt (2)
2
Motor Plate (1)
Motor Plate (1)
Motor Plate (1)
3
Motor (1)
Motor (1)
Motor (1)
4
Motor Support
Bracket (2)
Motor Support
Bracket (2)
Motor Support
Bracket (2)
5
Motor Support Rail
(2)
Motor Support Rail
(3)
Motor Support Rail
(2)
6
Housing Panel
Motor Side (1)
Housing Panel
Motor Side (1)
Housing Panel
Motor Side (1)
7
Access Panel (3)
Access Panel (3)
Access Panel (3)
8
Bearing Support
Reinforcement Plate
(1)
Bearing Support
Reinforcement Plate
(1)
Bearing Support
Reinforcement Plate
(2)
9
Belt Cover (1)
Belt Cover (1)
Belt Cover (1)
10
Bearing Support &
Bearing Support Leg
Bearing Support &
Bearing Support Leg
Bearing Support &
Bearing Support Leg
11
Inlet Panel (1)
Inlet Panel (1)
Inlet Panel (1)
12
Housing Frame
Support (6)
Housing Frame
Support (6)
Housing Frame
Support (6)
13
Inlet Cone, Sizes
135-402 (1)
Inlet Cone, Sizes
135-402 (1)
Inlet Cone, Sizes
135-402 (1)
14
Wheel (1)
Wheel (1)
Wheel (1)
15
Shaft (1)
Shaft (1)
Shaft (1)
16
Bearing Cover (1)
Bearing Cover (1)
Bearing Cover (1)
17 Housing Frame Rail
(2)
Housing Frame Rail
(2)
Housing Frame Rail
(2)
18
Bearing (2)
Bearing (2)
Bearing (2)
