Greenheck Housed Plenum Array , Plug and Plenum Fans (475405 Manual de usuario descargar pdf (Pagina 14)

Housed Plenum Array, Plug and Plenum

Problem Cause Corrective Action

Excessive Noise

Wheel rubbing (inlet)

Adjust wheel and/or inlet cone.

Tighten wheel hub or bearing collars on shaft.

V-belt drive

Tighten Sheaves on motor/fan shaft. Adjust belt tension. Align sheaves

properly (see V-Belt Drive section). Replace worn belts or sheaves.

Bearings

Replace defective bearing(s). Lubricate bearings.

Tighten collars and fasteners.

Wheel unbalance

Clean all dirt off wheel. Check wheel balance, rebalance in place if

necessary.

Low CFM

Fan Check wheel for correct rotation. Increase fan speed.*

Duct system Check duct installations with poor inlet or discharge conﬁgurations.

High CFM Fan Decrease fan speed.

High Horsepower Fan Check rotation of wheel. Reduce fan speed.

Fan Doesn’t

Operate

Electrical supply

Check fuses/circuit breakers. Check for switches turned off or

disconnected. Check for correct supply voltage.

Drive Check for broken belts. Tighten loose pulleys.

Motor Assure motor is correct horsepower and not tripping overload protector.

Overheated Shaft

Bearing

Lubrication Check for excessive or insufﬁcient grease in the bearings.

Mechanical

Replace damaged bearing. Relieve excessive belt tension. Align

bearings. Check for bent shaft.

Excessive

Vibration

Belts Adjust tightness of belts. Replacement belts should be a matched set.

System unbalance

Check alignment of shaft, motor and pulleys. Adjustable pitch pulleys

with motors over 15 hp are especially prone to unbalance. Check wheel

balance, rebalance if necessary.

* Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor and

result in motor failure. Do not exceed the maximum cataloged RPM of the fan.

NOTE: Always provide the unit model and serial numbers when requesting parts or service information.

Troubleshooting

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Greenheck Housed Plenum Array , Plug and Plenum Fans (475405 Manual de usuario Pagina 14

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