Fan Blades & Accessories

Transcription

1 D46 WHEN SHOULD YOU REPLACE A PROPELLER? HERE ARE A COUPLE OCCASIONS: Propeller balance is very sensitive. All Lau props are balanced AFTER the label has been applied to the blade. Balance is subject to change from even the slightest of pressure (such as simply resting the motor and propeller assembly on the ground after disassembly from a condensing unit). This is especially true of original equipment props as they are constructed of lighter gauge material. If a puller must be used to remove a prop from a motor shaft, it is very likely that the propeller will be distorted from the pressure. For the nominal cost of a propeller vs. the cost of a new motor, it makes sense to consider replacing the props with a Conaire heavy duty replacement designed to hold its balance in the toughest of applications and ensure years of continued service. GENERAL INFORMATION The simplest form of axial fans consists of a propeller, usually with three to five aluminum blades mounted in a venture. This type of fan finds wide use in applications requiring high air volumes at low static pressures. The performance characteristics of propellers may vary in many ways. Some general guidelines are: a. Increased blade pitch increases CFM and HP b. Decreased blade pitch decreases CFM and HP c. Increasing the number of blades increases static pressure characteristics BLADE SHAPE There are only three basic important shapes which are of interest in the propeller section - round blade, wide pressure blade and narrow pressure blades: Round blades are used for free air delivery and low pressure applications; round blades are quieter Wide Pressure blades are used in most applications operating at substantial static pressures. Wide pressure blades have excellent pressure characteristics and reasonable noise levels. Narrow Pressure blades are generally used in applications where higher static pressure exists, such as multi-row coils or places where minimum axial depth is necessary. PROPELLER VIBRATION Propellers, by nature, are rather flexible and subject to vibration. Commercially available propellers will have a number of natural frequencies occurring as different parts of the propeller vibrate, or as they vibrate in different modes. Lau exercises great care in designing propellers so natural frequencies do not occur at frequencies normally found in systems. PITCH SELECTION Pitch is measured at the spider lobe Consult the chart for pitch selection to avoid motor overload Make certain that the propeller horsepower does not exceed the motor horsepower On "Free Air" type propellers, use the brake horsepower published under the RPM in the performance chart On "Condenser" type applications, where static pressure is unknown, use the brake horsepower published at.3" static pressure for the appropriate RPM PROPELLER ROTATION The direction of rotation of a propeller is determined to be clockwise (CW) or counter-clockwise (CCW) when viewed from the air discharge side The discharge side is the concave ("cupped") side of the blade "Sandbox Method" - 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

2 D47 Free Air Type Fan Blades (3 Blade) Universal Replacement Propellers with Interchangeable Hubs Typical Applications These quality Lau propellers are designed for such free air and low pressure applications as: Pedestal Fans Wall and Roof Exhausters Air Circulators Window Fans Commercial Ventilating Equipment Agricultural Ventilating Equipment Unit Heaters General Cooling/Heating Applications Features Lau free air type propellers give you these important features: 3 blade designed with pitches to interchange with most field applications Rounded blade design for maximum free air delivery with minimum noise levels Pitches available for most common horsepower and motor speeds up to 1725 RPM in both CW and CCW rotations High quality aluminum blades Interchangeable hubs from 1/4" through 3/4" bore may be attached on either intake or discharge side Each propeller clearly identified as to pitch, diameter, rotation and maximum RPM Free Air Ratings Rotation Diameter Pitch 1050 RPM 1140 RPM 1550 RPM 1725 RPM Description Brand Part Number CFM BHP CFM BHP CFM BHP CFM BHP CW 10" 27 o F1027CW Lau CCW 10" 27 o F1027CCW Lau CW 12" 23 o F1223CW Lau CCW 12" 23 o F1223CCW Lau CW 14" 23 o F1423CW Lau CCW 14" 23 o F1423CCW Lau CW 16" 23 o F1623CW Lau CCW 16" 23 o F1623CCW Lau CW 18" 23 o F1823CW Lau CCW 18" 23 o F1823CCW Lau CW 20" 23 o F2023CW Lau CCW 20" 23 o F2023CCW Lau CW o F2418CW Lau Hubs must be ordered separately

3 D48 Heavy Duty Condenser Fan Blades (3 Blade) Hubs must be ordered separately

4 D49 Heavy Duty Condenser Fan Blades (4 Blade) Hubs must be ordered separately

5 D50 Heavy Duty Condenser Fan Blades (4 Blade) Hubs must be ordered separately

6 D51 OEM Condenser Fan Blades Diameter Pitch Number of Blades Rotation Hub Location Bore I.D. Description Brand Part Number 18" 24 o 3 CW Intake 0.5" Fits FS3BA018KA, FS3BA024KA Frigidaire R 18" 30 o 4 CW Discharge 0.5" Fits FS3BA030KA, FS3BA036KA and FS3BA042KA Frigidaire R 18" 30 o 4 CW Intake 0.5" Fits FS3BA048KA Frigidaire R 24" 30 o 3 CW Intake 0.5" Fits FS3BA060KA, FS3BA060KB Frigidaire R Discharge Intake

7 Hub Type Fan Blades Typical Applications Air Moving - heating or cooling Fan Coils Freezers Refrigerators Refrigerated Display Cases Heaters Ventilators Range Hoods Small Appliances Features 5 and 6 Blade designs 5 1/2" to 10" Diameters 1/4" and 5/16" Bores CW and CCW rotations High quality aluminum blades CW rotation - hub on intake side CCW rotation - hub on discharge side D52

8 D53 Plastic Fan Blades Rotation Bore Type Bore Diameter Fan Diameter Brand Part Number C.W. Round Bore Hub.1811" 3 1/2" Fasco K-FAN6012 C.W. Round Bore Hub.1811" 4" Fasco K-FAN6011 C.W. "D" Shaped Hub.2178" 6 5/8" Fasco K-FAN Round Bore Hub.1811" 4 5/8" Fasco K-FAN "D" Shaped Hub.2178" 4 5/8" Fasco K-FAN4032 K-FAN6009 K-FAN6011 K-FAN6012 K-FAN4031 K-FAN4032 Push Nut For Fan Blades - Used With K-Line Motors Fits Bore Diameter Brand Part Number.1811" Fasco K-NUT

9 D54 Hex / Round Hubs