Troubleshooting
Symptom | Possible Cause | Corrective Action | |
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| Blown fuse or open circuit breaker | Replace fuse or reset circuit breaker and check amps | |
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Blower fails to | Broken fan belt | Replace | |
operate | Defective motor or capacitor | Replace | |
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| Motor starter overloaded | Reset starter and check amps | |
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| Airflow too high | Check airflow and adjust drives if needed | |
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| Static pressures are higher or lower | If higher, ductwork should be improved | |
| than design | If lower, fan RPMs should be lower | |
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Motor overamps | Blower rotation is incorrect | Check rotation and correct | |
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Motor voltage incorrect | Check motor nameplate and supplied voltage | ||
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| Motor horsepower too low | See specifications and catalog for fan curves to determine | |
| if horsepower is sufficient | ||
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| Shorted windings in motor | Replace motor | |
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| Mixing box damper not fully open | Adjust damper linkage or replace damper motor | |
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| System static pressure too high | Improve ductwork to eliminate losses using good duct | |
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| Blower speed too low | Check for correct drives and RPMs with catalog data | |
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Insufficient airflow | Mixing box dampers closed | Open and adjust | |
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Dirty or clogged filters | Clean or replace | ||
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| Leaks in ductwork | Repair | |
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| Elbows, or other obstructions may | Correct or improve ductwork | |
| restrict fan outlet | ||
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| Belt slippage | Adjust belt tension | |
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| Blower fan speed too high | Check for correct fan RPM | |
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Too much airflow | Filter(s) not in place | Install filters | |
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Insufficient static pressure | Induce static pressure into system ductwork | ||
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| (airflow resistance) | ||
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| Wheel rubbing on housing | Center wheel | |
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| Loose wheel on shaft | Tighten wheel setscrew | |
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| Loose motor or blower sheave | Tighten sheave setscrew | |
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| Belts too loose | Adjust belt tension after 24 hours of operation | |
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| Belts too tight | Loosen to maintain 3/8 inch deflection per ft. of span | |
| between sheaves | ||
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Excessive noise | Worn belt | Replace | |
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or vibration | Motor base or blower loose | Tighten mountings bolts | |
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| Worn bearings | Replace | |
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| Bearing and drive alignment | Realign | |
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| Motor out of balance | Replace | |
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| Wheel out of balance | Replace or rebalance | |
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| Sheaves eccentric or | Replace or rebalance | |
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| Accumulation of material on wheel | Clean wheel and housing | |
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10 Model VFCD/VFCB Vertical Fan Coil
®
