TROUBLESHOOTING
PROBLEM | CAUSE | CORRECTIVE ACTION | |
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| System resistance is too high. | Check backdraft dampers for proper operation. | |
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| Remove obstructions in ductwork. Clean dirty | |
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| filters. Check for adequate supply air for | |
Reduced airflow |
| exhaust fans or exhaust air for supply fans. | |
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Fan too close to damper. | Increase distance between fan and damper. | ||
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| Unit running backwards. | See | |
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| Fan speed too low. | Increase fan speed. | |
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| Excessive dirt on propeller. | Clean propeller. | |
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| Bearings | Tighten bearing collars and set screws | |
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| Lubricate bearings. Replace defective bearings. | |
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| Tighten pulleys on motor and fan shaft. Adjust | ||
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| belt tension. Align pulleys. Replace worn belts | |
Excessive Noise |
| or pulleys. See "Routine Maintenance". | |
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Excessive vibration | Remove dirt | ||
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| screws and fasteners for tightness. Check for | |
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| worn bearing. Correct propeller imbalance. | |
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| Check for loose dampers, guards or ductwork. | |
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| Defective Motor | Replace motor. | |
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Motor load amperage must be checked and compared to nameplate rating to avoid serious damage to motor when speed is increased.
Belt Drive Fans Parts List
10 | 6 |
7
5
9 | 4 |
3
8
2
1
1.Fan Panel
2.Propeller
3.Drive Frame Channel (2)
4.Motor Plate
5.Motor
6.Motor Pulley
7.Shaft Pulley
8.Fan Shaft
9.Bearings (2)
10.Belt
11.Bearing Plate (Level 3 fans only - not shown)
Direct Drive Fans Parts List
4
3
5
2
1
1.Fan Panel
2.Propeller
3.Drive Frame Channel (2)
4.Motor Plate
5.Motor
IOM RB
