ROTATION

The propeller's rotation direction is determined to be clockwise (CW) or counterclockwise (CCW) when viewed from the air discharge side (air blowing in your face). The discharge side is the concave ("cupped") side of the blade.

Imagine standing in a sandbox and dropping the propeller face up, or face down, on the sand. Regardless of which side is up, the direction of rotation is the same as the direction required to turn the propeller into the sand.

MOTOR NAMEPLATE

The motor nameplate provides the most important information for selection of a replacement propeller - the RPM and the BHP. The horsepower required by the propeller selected should not exceed the BHP of the motor nameplate at the rated RPM.

If the motor nameplate does not include the BHP rating, the replacement propeller must be selected only on the basis of the pitch and the number of blades of the old propeller. In this case, it is advisable after replacement of the propeller to check the actual amperage draw of the motor to ensure that it does not exceed the rated amps.

PROPELLER SELECTION CHECKLIST

To help you make the best selection of a replacement propeller, regardless of manufacturer, use this checklist to record the necessary information from the motor nameplate and from the broken or faulty propeller.

  _________ Diameter

  _________ Number of Blades

  _________ Pitch

  _________ Rotation (CW or CCW)

  _________ Bore Size

  _________ Propeller Type

                   (Free Air or Condenser)

  _________ Motor Nameplate RPM

  _________ Motor Nameplate HP, or if not

                   available, AMP rating.

 Match above listed information with the performance tables given in the Lau Universal Replacement 2000C Catalog to select the proper Lau replacement. See Technical Information on previous page.

1. Disconnect electrical power before working on unit.
2. Note location of old propeller in unit. Remove old propeller from motor shaft. Use proper type of puller. Do not hammer on propeller as this can result in a bent shaft or bearing damage.
3. Remove burrs and rust from motor shaft.
4. Use extra care in handling and installation. Locate interchangeable hub on desired side of propeller (air intake or air discharge). Attach hub to propeller with three (3) screws provided (to determine side to locate hub on, it will be helpful to note hub location of old propeller). Tighten screws approximately 30 in.-lbs..
5. Place propeller on motor shaft in unit and locate in approximately the same position as the old propeller.
6. Make sure that the propeller will be rotating in the right direction.
7. Fasten the propeller to the motor shaft by tightening set screws securely. Be sure to align set screw with flat on motor shaft.   (See Chart Below)
8. Rotate the propeller by hand to make sure that the blades clear any obstructions by at least 1/4".