Greenheck Fan 474051 manual Troubleshooting, Problem, Cause, Corrective Action

Troubleshooting

Problem	Cause	Corrective Action
	Wheel rubbing (inlet)	Adjust wheel.
		Tighten wheel hub or bearing collars on shaft.
		Tighten Sheaves on motor/fan shaft. Adjust belt tension. Align
	V-belt drive	sheaves properly (see V-Belt Drives section). Replace worn belts
Excessive Noise		or sheaves.
	Bearings	Replace defective bearing(s). Lubricate bearings.
		Tighten collars and fasteners.
	Wheel unbalance	Clean all dirt off wheel. Check wheel balance, rebalance if
		necessary.
Low CFM	Fan	Check wheel for correct rotation. Increase fan speed.*
	Duct system	See page 3.
High CFM	Fan	Decrease fan speed.
	Duct system	Resize ductwork. Access door, filters, grilles not installed.
	Duct system
Static Pressure	has more or less	Change obstructions in system. Use correction factor to adjust
Wrong	restriction than	for temperature/altitude. Resize ductwork. Change fan speed.*
	anticipated
	Fan	Check rotation of wheel. Reduce fan speed.
High Horsepower
	Duct system	Resize ductwork. Check proper operation of face and bypass
		dampers. Check filters and access doors.
	Electrical supply	Check fuses/circuit breakers. Check for switches turned off or
		disconnected. Check for correct supply voltage.
Fan Doesn’t Operate	Drive	Check for broken belts. Tighten loose pulleys.
	Motor	Assure motor is correct horsepower and not tripping overload
		protector.
Overheated Shaft	Lubrication	Check for excessive or insufficient grease in the bearings.
		Replace damaged bearing. Relieve excessive belt tension. Align
Bearing	Mechanical
		bearings. Check for bent shaft.
	Belts	Adjust tightness of belts. Replacement belts should be a matched
		set.
Excessive	System unbalance	Check alignment of shaft, motor and pulleys. Check wheel
		balance, rebalance if necessary.
Vibration
	Coupling	Check alignment between coupling, motor and fan shafts.
		Any adjustments should be made per coupling manufacturer’s
	misalignment
		instructions. Shim only under motor.

*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.

Model BCSW-FRP 11