Troubleshooting; Our Commitment - Greenheck DFD Series Installation, Operation And Maintenance Manual

Troubleshooting

WARNING
Before taking any corrective action, make certain unit
is not capable of operation during repairs.
PROBLEM
Wheel rubbing inlet
V-belt drive
Bearings
Wheel unbalance
Excessive
Belts too tight or too loose
noise
Wheel improperly aligned and rubbing Center wheel on inlet, see page 7, Figure 13.
or vibration
Loose drive or motor pulleys
Foreign objects in wheel or housing
Fan base not securely anchored
Motor hood loose and rattling
Defective or loose motor bearings
Fan
High
horsepower
Duct system
Electrical supply
Fan does
Drive
not operate
Motor
Lubrication
Mechanical
Belt slippage
Motor
Over/Under line voltage
overloads
or overheats
Incorrect wheel rotation
Wheel RPM too high
Undersized motor
Motor wired incorrectly
System resistance too high
Unit running backwards
Excessive dirt buildup on wheels
Reduced
Improper wheel alignment
airflow
Dampers closed
Blocked duct/clogged filter
Belt slippage
Speed too slow

Our Commitment

As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
Greenheck's Centrifugal Upblast and Sidewall Exhaust catalog
provides additional information describing the equipment, fan
performance, available accessories, and specification data.
®
Phone: 715.359.6171 • Fax: 715.355.2399 • Parts : 800.355.5354 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
12 471560 • CUE and CUBE, Rev. 12, July 2019
CAUSE
Adjust wheel and/or inlet cone. Tighten wheel hub or bearing collars on shaft.
Tighten pulleys on motor/fan shaft. Adjust belt tension. Align pulleys properly,
see page 7, Figures 15 and 16. Replace worn belts or pulleys.
Replace defective bearing(s). Lubricate bearings. Tighten collars and fasteners.
Clean all dirt off wheel. Check wheel balance, rebalance in place if necessary.
Adjust tension, see page 8, Figures 18a and 18b.
Align and tighten. See "Pre-Starting Checks", pages 7 and 8.
Remove objects, check for damage or unbalance.
Secure properly.
Tighten fasteners to secure the motor hood.
Replace motor with same frame size, RPM-HP
Check rotation of wheel, see page 7, Figure 14. Reduce fan speed.
Resize ductwork. Check proper operation of face and bypass dampers.
Check filters and access doors.
Check fuses/circuit breakers. Check for switches off. Check for correct supply voltage.
Check for broken belts. Tighten loose pulleys or belts.
Ensure 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 tension or replace bad belts, see pages 7 and 8.
Contact power company.
Check motor wiring, see page 4, Figure 6. Confirm wheel rotation, see page 7, Figure 14.
Check drives or slow down fan by opening variable pitch pulley on motor shaft.
Check motor ratings with catalog speed and air capacity chart.
Check motor wiring to wiring diagram located on fan motor.
Check system: Proper operation of backdraft or control dampers, obstruction in
ductwork, clean dirty filters.
Correct as shown see page 7, Figure 14.
Clean wheel, see page 9.
Center wheel on inlet, see "Pre-Starting Checks".
Inspect and repair.
Clean or replace.
Replace and adjust tension.
Check for correct drives.
AVERTISSEMENT
Avant d'entreprendre toute action corrective, s'assurer
que l'appareil ne pourra pas fonctionner durant les
réparations.
CORRECTIVE ACTION
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides
additional safety information. This publication can be obtained
from AMCA International, Inc. at www.amca.org.
Copyright 2019 © Greenheck Fan Corporation