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Unit Start-Up
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.
Visual Inspection of Equipment
The equipment type and arrangement should be verified
as ordered at once when it arrives at the job site. When
a discrepancy is found, the local sales representative
must be notified immediately so that corrective action
may be investigated, also verify electrical conformance
to specifications. Unauthorized alterations and
unauthorized back charges will not be recognized by
the manufacturer.
After the unit has been assembled, installed and all
utilities have been hooked up, the unit is now ready for
operation.
Check
Before starting the unit, check the following:
1. Confirm that building supply voltage matches the
voltage for which the unit is wired.
2. Check all piping and wiring penetrations made by
contractors for water tightness. All penetrations
must be made watertight to prevent water damage
to the unit and building.
3. Rotate the fan wheel manually to be sure that it is
free to operate. Remove any dirt or debris that may
have accumulated during installation.
4. Check the fan bearing setscrews for tightness.
5. Check alignment of sheaves and V-belts (See
maintenance section).
6. Inspect all fasteners to ensure that none have
loosened during shipment.
7. Check flex coupling for proper alignment and
connect between motor shaft and fan shaft (direct
drive).
8. Check all guarding to ensure that it is securely
attached and not interfering with rotating parts.
9. Check all electrical connections for proper
attachment.
10. Check housing and ductwork, if accessible, for
obstructions and foreign material that may damage
the fan wheel.
11. Fill drainage piping trap.
®
Additional Steps for Initial Start-Up
1. Check for proper wheel rotation by momentarily
energizing the fan. Access to view the wheel can be
gained through the blower housing access panel.
One of the most frequently encountered problems
are motors that are wired to rotate the wheel in the
wrong direction. This is especially true with 3-phase
installations where the motor will run in either
direction, depending on how it has been wired. To
reverse rotation of a 3-phase motor, interchange any
two of the three electrical leads. Single phase motors
can be reversed by changing internal connections as
described on the motor label or wiring diagram.
2. Fans with multi-speed motors should be checked on
low speed during initial start-up.
3. Check for unusual noise, vibration or overheating of
bearings. Refer to the "Troubleshooting" section of
this manual if a problem develops.
4. Grease may be forced out of the bearing seals during
initial start-up. This is a normal self-purging feature
for the type of bearing used on this product.
Vibration
On start-up and during operation, the unit should
operate smoothly with minimal vibration. It is possible
that a higher degree of vibration may be experienced.
Excessive vibration if left unchecked, can cause a
multitude of problems, including structural and/or
Common Sources of Vibration
1. Wheel Unbalance
2. Drive Pulley Misalignment
3. Incorrect Belt Tension
4. Bearing Misalignment
5. Mechanical Looseness
6. Faulty Belts
7. Drive Component Unbalance
8. Poor Inlet/Outlet Conditions
9. Foundation Stiffness
actions. If observation cannot locate the source of
vibration, a qualified technician using vibration analysis
equipment should be consulted. If the problem is wheel
unbalance, in-place balancing can be done through the
access panel located on the side of each fan's tubular
housing. 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).
FumeJet
component failure.
The most common
sources of vibration
are listed.
Many of these
conditions can be
discovered by careful
observation. Refer to
the troubleshooting
section of this
manual for corrective
®
Fume Exhaust Fans
9
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