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Unit Start-Up
DANGER
High voltage electrical input is needed for this
equipment. This work should be performed by a
qualified electrician.
WARNING
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.
1. Disconnect and lock-out all power switches to fan.
2. Check all fasteners, set screws and locking collars
on the fan, impeller, bearings, drive, motor base and
accessories for tightness.
3. Rotate the fan impeller by hand and assure no parts
are rubbing.
4. Check for bearing alignment and lubrication.
(VAB)
5. Check the V-belt drive for proper alignment and
tension. (VAB)
6. Check all guarding (if supplied) to ensure that it is
securely attached and not interfering with rotating
parts.
7. Check all electrical connections for proper
attachment.
8. Check housing and ductwork, if accessible, for
obstructions and foreign material that may damage
the fan impeller.
6
Vane Axial Fans
Routine Maintenance
When performing any service to the fan, disconnect the
electrical supply and secure fan impeller.
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 (see below).
2. Impeller, housing, bolts and set screws on the entire
fan should be checked for tightness.
3. Any dirt accumulation on the impeller or in the
housing should be removed to prevent unbalance
and possible damage.
4. Isolation bases should be checked for freedom
of movement and the bolts for tightness. Springs
should be checked for breaks and fatigue. Rubber
isolators should be checked for deterioration.
5. Inspect fan impeller and housing looking for fatigue,
corrosion, or wear.
Motors
Motor maintenance is generally limited to cleaning
and lubrication. Cleaning should be limited to exterior
surfaces only. Removing dust and grease build up on
the motor housing assists proper motor cooling. Never
wash-down motor with high pressure spray. Many
fractional motors are permanently lubricated for life
and require no further lubrication. Motors supplied with
grease fittings should be greased in accordance with
the manufacturer's recommendations.
CAUTION
When operating conditions of the fan are to be
changed (speed, pressure, temperature, etc.), consult
Greenheck to determine if the unit can operate safely
at the new conditions.
Variable Frequency Drive Operation
WARNING
For operation with Variable Frequency Drive (VFD),
always check motor amps when adjusting the
operating frequency. Motor may be sized for the
original selected operating speed under 60 Hz.
Bypassing the VFD or increasing the speed from this
original selection, even if less than 60 Hz, may cause
motor overload or failure. Consult factory with fan
serial number before increasing the upper limiting
frequency.
Always check the fan rpm when adjusting the
operating frequency. Do not exceed maximum fan rpm
stated on the unit identification nameplate.
®
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