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Troubleshooting
Problem
Excessive noise
Low CFM
High CFM
Static pressure wrong
High horsepower
Fan doesn't operate
Overheated bearing
Excessive vibration
* 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.
Unit Identification
The tag below is an example of an identification label on the fan. The information provides general details
about the fan, as well as containing specific information unique to the unit. When contacting your Greenheck
representative with future needs or questions, please have the information on this label available.
Tags are mounted in an area which is clearly visible—usually on the side of the fan housing.
®
MODEL
S/N
MARK
4
Vektor-CD Centrifugal Laboratory Exhaust
Cause
Wheel rubbing inlet
V-belt drive
Bearings
Wheel unbalance
Fan
Duct system
Fan
Duct system
Duct system has more
or less restriction than
anticipated
Fan
Duct system
Electrical supply
Drive
Motor
Lubrication
Mechanical
Belts
System unbalance
Corrective Action
Adjust wheel and/or inlet cone. Tighten wheel hub or
bearing collars on shaft.
Tighten sheaves on motor/fan shaft. Adjust belt tension.
Align sheaves properly (see procedure). Replace worn
belts or sheaves.
Replace defective bearing(s). Lubricate bearings.
Tighten collars and fasteners.
Clean all dirt off wheel. Check wheel balance, replace if
necessary.
Check wheel for correct rotation. Check blade position
of bypass air plenum (BAP) damper, increase fan speed.*
Higher pressure than design. Filters need replacement.
Decrease fan speed.
Increase BAP damper blade open position. Resize
ductwork. Access door, filters, dampers not installed.
Change obstructions in system. Use correction factor
to adjust for temperature/altitude. Adjust set point used
to control BAP damper modulation. Resize ductwork.
Clean filters/coils. Change fan speed.*
Check rotation of wheel. Reduce fan speed.
Resize ductwork. Check proper operation of isolation
and bypass dampers. Check filters and access doors.
Check fuses/circuit breakers. Check for switches turned
off or disconnected. Check for correct supply voltage.
Check for broken belts. Tighten loose pulleys.
Assure motor is correct horsepower and not tripping
overload protector.
Check for excessive or insufficient grease in the bearing.
Replace damaged bearing. Relieve excessive belt
tension. Align bearings. Check for bent shaft.
Adjust tightness of belts. Replacement belts should be a
matched set.
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.
Model — General description of fan
S/N
— Serial Number assigned by Greenheck,
which is a unique identifier for every unit
Mark — Customer supplied identification
®
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