Greenheck EQB (479049) - Manual (Page 6)

Mixed Flow Inline Fan 6
Motor maintenance is generally limited to cleaning
and lubrication (where applicable). Limit cleaning to
exterior surfaces only. Removing dust buildup on
motor housing ensures proper motor cooling.
Greasing of motors is only intended when fittings are
provided. Many fractional horsepower motors are
permanently lubricated and should not be lubricated
after installation. Motors supplied with grease fittings
should be greased in accordance with manufacturers’
recommendations. Where motor temperatures do not
exceed 104ºF (40ºC), the grease should be replaced
after 2,000 hours of running time as a general rule.
Wheels require little attention when moving clean air.
Occasionally, oil and dust may accumulate causing
imbalance. When this occurs clean the wheel and
housing to ensure smooth and safe operation.
Prior to restarting unit, check all fasteners for
tightness each time maintenance checks are
performed.
A proper maintenance program will help deliver years
of dependable service. Once the unit has been put
into operation, a routine maintenance schedule should
be set up to accomplish the following:
1. Lubrication of bearings and motor.
2. Belts should be checked for wear and tightness.
3. Wheel, housing, bolts and set screws on the entire
fan should be checked for tightness.
4. Any dirt accumulation on the wheel or in the
housing should be removed to prevent imbalance
and possible damage.
5. Spring isolators should be checked for breaks and
fatigue. Check rubber isolators for deterioration.
6. Inspect fan impeller and housing looking for
fatigue, corrosion or wear.
Belt/Drive Sheave Maintenance
Belts and drive sheaves must be checked on a
regular basis for wear, tension, alignment and dirt
accumulation. Premature or frequent belt failures
can be caused by improper belt tension (either too
IMPORTANT
Changing the belts or drives can significantly
increase the amp draw of the motor. If changes
are made to the drives or belts, the amps must be
checked to assure no overamping.
Vibration
Excessive vibration is the most frequent problem
experienced during initial start-up. Left unchecked,
excessive vibration can cause a multitude of
problems, including structural and/or
component failure.
The most common sources of vibration are:
• Wheel imbalance
• Drive pulley misalignment
• Incorrect belt tension
• Bearing misalignment
• Mechanical looseness
• Faulty belts
• Drive component unbalance
• Poor inlet/outlet conditions
• Foundation stiffness
Many of these conditions can be discovered by
careful observation. Refer to the Troubleshooting
section of this manual for corrective actions.
If observation cannot locate the source of vibration, a
qualified technician using vibration analysis equipment
should be consulted. If the problem is wheel
imbalance, in place balancing can be done providing
there is access to the fan wheel. Any correction
weights added to the wheel should be welded to
either the wheel back (single-plane balance) or to the
wheel back and wheel cone (two-plane balance).
Inspection
Inspection of the fan should be conducted at the
first 30 minute and 24 hour intervals of satisfactory
operation.
30 Minute Interval - Inspect bolts, set screws
and motor mounting bolts. Adjust and tighten as
necessary.
24 Hour Interval - Check all internal components.
Inspect belt alignment and tension. Adjust and tighten
as necessary.
IMPORTANT
Some maintenance procedures will require the fan
to be removed from the duct system. Ensure there
is enough space around the fan to perform this
operation and that proper lifting equipment is used.
IMPORTANT
Do not allow water or solvents to enter the motor or
bearings. Under no circumstances should motors or
bearings be sprayed with steam, water or solvents.
Maintenance
Installation and maintenance are to be performed
only by qualified personnel who are familiar with local
codes and regulations, and who are experienced with
this type of equipment.
DANGER
Disconnect and secure to the ‘OFF’ position all
electrical power to the fan prior to inspection
or servicing. Failure to comply with this safety
precaution could result in serious injury or death.
DANGER
Pour écarter les risques de blessure grave ou
de mort, débrancher et verrouiller l’alimentation
électrique en position « Arrêt » avant tout contrôle
ou entretien.
®