Fan Troubleshooting Guide
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 RPM.
- Incorrect voltage.
Overheated Bearings
- Improper bearing
lubrication.
- Excessive belt
tension.
Heat Gain form Occupants of Conditioned Spaces
| Typical
Application |
Sensible
Heat
(BTU/HR) |
Latent
Heat
(BTU/HR)
|
| Theater-Matinee |
200 |
130 |
| Theater-Evening |
215 |
135 |
| Offices, Hotels,
Apartments |
215 |
185 |
| Retail &
Department Stores |
220 |
230 |
| Drug Store |
220 |
280 |
| Bank |
220 |
280 |
| Restaurant |
240 |
310 |
| Factory |
240 |
510 |
| Dance Hall |
270 |
580 |
| Factory |
330 |
670 |
| Bowling Alley |
510 |
940 |
| Factory |
510 |
940 |
Notes
- Tabulated values
are based on 78F for dry-bulb temperature.
- Adjusted total
heat value for sedentary work, restaurant, includes 60 Btuh for food
per individual (30 Btu sensible and 30 Btu latent).
- For bowling figure
one person per alley actually bowling, and all others as sitting (400
Btuh) or standing (550 Btuh).
- Use sensible values
only when calculated ventilation to remove heat.
|