Greenheck Fan 47555 specifications Unit Start-Up, Additional steps for initial start-up, Vibration

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.

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

2.Check for bearing alignment and lubrication.

3.Check the V-belt drive for proper alignment and tension (belt drive).

4.Check rigid coupling for proper alignment and connect between motor shaft and fan shaft (direct drive).

5.Check all guarding to ensure that it is securely attached and not interfering with rotating parts.

6.Check operation of isolation and bypass dampers (if supplied) for freedom of movement.

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 wheel.

9.Fill drainage piping trap.

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

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

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.

Centrifugal	Centrifugal
Backward Inclined	Airfoil

CW Rotation - always viewed from the drive side.

One of the most frequently encountered problems with Centrifugal Fans are 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. Single phase motors can be reversed by changing internal connections as described on the motor label or wiring diagram.

2.If the fan has inlet vanes, they should be partially closed to reduce power requirements. This is especially important if the fan is designed for a high temperature application and is being started at room temperature.

3.Fans with multi-speed motors should be checked on low speed during initial start-up.

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

5.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. Left unchecked, excessive vibration can cause a multitude of problems, including structural and/or component failure. The most common sources of vibration are listed below.

•Wheel Unbalance

•Drive Pulley Misalignment

•Incorrect Belt Tension

•Bearing Misalignment

•Mechanical Looseness

•Faulty Belts

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, 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).

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 0.10 in./sec. peak (0.08 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.

10 Vektor-CD Centrifugal Laboratory Exhaust

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