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Operation
Before electrical connections are made, the supply
voltage, phase and ampere capacity must be checked
for compatibility with the fan motor. In addition, the
supply wiring must be properly fused and conform to
local and national electrical codes.
The supply wires are then connected to an optional
safety disconnect switch, to the optional wiring pigtail,
or directly to the motor junction box.
Start-Up Checks
1. Check all fasteners for tightness. Fasteners may
come loose during transit or handling at the jobsite.
This includes motor bolts, mounting brackets, and
bushing bolts attaching the propeller to the motor
shaft.
2. Propeller rotation should be in the same direction
as the rotation decal affixed to the unit. For 3-phase
installations, fan rotation can be reversed by simply
interchanging any two of the three electrical leads.
Field Performance Adjustments
The performance of a GJX fan can be adjusted through
the use of a Variable Frequency Drive (VFD).
Any change—increase or decrease—in fan speed
(RPM) can represent a substantial increase in power
required from the motor.
Check motor load amperage and compare to nameplate
rating when changing the fan speed.
Torque Specifications for Bushings and
Propeller Bolts
Bushing Type
Unidirectional
Bushing Bolts/
12.2 N-m
Set Screw
Propeller Bolts
9.5 N-m
Adjusting Performance with a Variable
Frequency Drive
Before wiring a Variable Frequency Drive (VFD),
determine that the motor is compatible with this type
of equipment. Connecting a VFD to a non-compatible
motor may reduce the life of the motor. Additionally, it
is important to properly ground fans being wired with a
VFD. For more information on these subjects, refer to
Greenheck document "Are Bearing Currents Causing
Your Motor Failures?" located at www.greenheck.com.
Click on Application Info, then on Product Application
Articles, and use the keyword "VFD". Greenheck is not
responsible for improper wiring of a VFD or for potential
motor damage as a result of operating a fan over its
maximum operating frequency.
NOTE
Maintenance
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.
Once the unit has been put into operation, a routine
maintenance schedule should be set up to accomplish
the following:
1. Propeller, housing and bolts on the entire fan should
be checked for tightness.
2. Any dirt accumulation on the propeller or in the
housing should be removed to prevent unbalance
and possible damage.
3. Inspection of fan propeller and housing looking for
fatigue, corrosion or wear.
Motors
Motor maintenance is generally limited to cleaning.
Cleaning should be limited to exterior surfaces only.
Removing dust and grease buildup on the motor
housing assists proper motor cooling. Never wash down
the motor with high pressure spray.
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.
Greasing of motor bearings is not required.
Infrequent Use
Infrequent use is defined as a fan that is used less than
once per month or is used in emergency situations only.
The fan should be run at least four hours every month
to ensure adequate lubrication in the motor bearings.
Ideally this would be two hours every other week.
Fasteners and Set Screws
A periodic inspection should include checking all
fasteners and bolts for tightness. Particular attention
should be paid to the bushing attaching the propeller to
the motor shaft and the motor to its mounting fixture.
Removal of Dust and Dirt
Dirt clogs the cooling openings on the motor housing,
contaminates bearing lubricant and collects on the
propeller causing severe imbalance if left unchecked.
The exterior surface of the motor and propeller should
be thoroughly cleaned periodically. Use caution and do
allow water or solvents to enter the motor. Under no
circumstances should motors be sprayed with steam or
water.
®
GJX GreenJet
5
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