Unit Start-Up, Vibration | Greenheck Fan 474051 specs

Clockwise Rotation Always viewed from the drive side.

Unit Start-Up

1.Disconnect and lock-out all power switches to fan. See warning below.

2.Check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and accessories for tightness.

3.Rotate the fan wheel by hand and assure no parts are rubbing.

4.Check for bearing alignment and lubrication.

5.Check for coupling alignment (Arr. 8 only).

6.Check the V-belt drive for proper alignment and tension.

7.Check all the guarding (if supplied) for being securely attached and not interfering with rotating parts.

8.Check all electrical connections for proper attachment.

9.Check housing and ductwork, if accessible, for obstructions and foreign material that may damage the fan wheel.

10. Check that the drain is connected, or plugged, and the housing is being properly drained.

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.

Additional Steps for Initial Start-Up

1.Check for proper wheel rotation by momentarily

energizing the fan. Rotation

is always determined by viewing the wheel from

the drive side and should correspond to the rotation decal affixed to the unit.

One of the most frequently encountered problems with Centrifugal Fans is motors which are wired to run 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.

2.Check for unusual noise, vibration or overheating of bearings. Refer to the “Troubleshooting” section of this manual if a problem develops.

3.Grease may be forced out of the bearing seals during initial start-up. This is a normal self-purging feature of this type of bearing.

Vibration

Excessive vibration is the most frequent problem experienced during initial start-up.

Common Sources of Vibration

1.Wheel Unbalance

2.Drive Pulley Misalignment

3.Incorrect Belt Tension

4.Bearing / Coupling Misalignment

5.Mechanical Looseness

6.Faulty Belts

7.Drive Component Unbalance

8.Poor Inlet/Outlet Conditions

9.Foundation Stiffness

Left unchecked, excessive vibration can cause a multitude of problems, including structural and/or component failure.

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 unbalance, the wheel should be sent back to the factory to be properly rebalanced.

Greenheck performs a vibration test on all centrifugal fans before shipping. Three vibration readings are taken on each bearing in the horizontal, vertical, and axial directions. The allowable maximum vibration for belt drive units is 0.078 in/sec. peak (0.05 in/ sec. direct drive) velocity filter-in at the fan RPM per AMCA Standard 204. These vibration signatures are a permanent record of how the fan left the factory and are available upon request.

Generally, fan vibration and noise is transmitted to other parts of the building by the ductwork. To eliminate this undesirable effect, the use of heavy canvas connectors is recommended. If fireproof material is required, FlexweaveTM 1000 - Type FN-30 can be used.

8Model BCSW-FRP