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Greenheck Fan 240XP-CUb manual

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Table of contents for the manual

  • Page 1

    Fan Selection Application-Based Selection Performance Theory[...]

  • Page 2

    This book is designed to help you select the fan that will best fit the application for which it is intended. With the large number of differ ent fan types and sizes available it's necessary to know which fan model does the best job in certain applications and then be able to select the most economical fan size for the job. With that in mind, [...]

  • Page 3

    T ABLE OF CONTENTS SECTION 1 INTRODUCTION TO F AN SELECTION T erms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Model Designation . . . . . . . . . . . . . . . . . . . . . .4 Reading Performance Charts . . . . . . . . . . . . . .5 Matching a Specification . . . . . . . . . . . . . . . . .7 Cross Refer ence Chart . . . . . . . . [...]

  • Page 4

    This is the first and most basic of this manual’s three sections, all of which are designed to enable you to select the right fan for the job. Look at this first section as a “user’s manual” for Greenheck literature. It will answer the following questions (and more): What is a SONE? How are model numbers and performance tables used to selec[...]

  • Page 5

    Reading Performance Charts Assume that a job requires a belt drive roof exhauster to move 1000 cfm against 0.25 in. Ps. Refer to the performance model at the bottom of this page. Start at the top of the chart with the 0.25 in. Ps column. (All numbers in this column correspond to .25 in. Ps.) Now follow the column downward until a value is found tha[...]

  • Page 6

    Model Common Accessories Roof Curb G & GB Backdraft Damper Roof Curb CUBE Grease Trap SB Wall Mount Housing or Wall Mount Collar Model Common Accessories Speed Control SP & CSP Discharge Vents Backdraft Damper SQ & BSQ Vibration Isolators One advantage of choosing the GB-101-4-R2 over the GB-101-4-R1 is that it is capable of running at [...]

  • Page 7

    Model RSF and BCF Selection The RSF and BCF selection charts are different from all other selection charts. For these models, the cfm values are at the left side of the chart in a single column and the rpms are in the performance boxes. It is just the opposite for other models. The reason for this is that the RSF and BCF models are forward curved, [...]

  • Page 8

    Cross Refer ence Chart (Models in italics refer to older models) Direct Drive 120 W 1 0 D Direct Drive rpm x 100 Model ACW Wheel Size Belt Drive 150 V 6 B Belt Drive 3/4 hp Model VCR Wheel Size = 15 in. Direct Drive PW 135 A 8 860 rpm 1/20 hp Wheel Size =13.5 in. Model PW Belt Drive PNN 163 G 1/2 hp Wheel Size = 16.3 in. Model PNN Cook- Acme - Lett[...]

  • Page 9

    F AN SELECTION BASED ON F AN APPLICA TION Direct Drive vs Belt Drive Direct drive fans are economical for low volume (2000 cfm or less) and low static pressure (0.50 in. or less). They require little maintenance and most direct drive motors can be used with a speed control to adjust the cfm. Belt drive fans are better suited for air volumes above 2[...]

  • Page 10

    Recommended Exhaust Fans Commer cial Kitchen V entilation Model CUBE Model USGF Model CWB Model SWB Belt Drive Belt Drive Belt Drive Belt Drive Upblast Roof Exhaust Upblast Roof Exhaust Sidewall Exhaust Utility Blower 300-30,000 cfm 300-7,000 cfm 300-12,000 cfm 500-30,000 cfm Up to 5.0 in. wg Up to 3 in. wg Up to 2.75 in. wg Up to 5.0 in. wg The ab[...]

  • Page 11

    Commer cial Kitchen V entilation Fan Sizing Exhaust When not specified by local codes, the following guidelines may be used to determine the minimum kitchen hood exhaust cfm. Some local codes require 100 cfm/ft. 2 of hood area for wall style hoods. Supply Recommended supply airflow is 90% of exhaust cfm. The remaining 10% of supply air will be draw[...]

  • Page 12

    General Commer cial V entilation Models SQ and BSQ are versatile fans that can be used for exhaust or supply and can be mounted in any position. Two removable side panels provide access for service. Model G Direct Drive Roof Exhaust 90-3,200 cfm Up to 1.0 in. wg Model GB Belt Drive Roof Exhaust 80-44,700 cfm Up to 3.25 in. wg Model CW Direct Drive [...]

  • Page 13

    T ypical Commer cial V entilation Installations 13[...]

  • Page 14

    General Industrial V entilation Typical Applications Propeller fans are ideal for ventilating high air volumes at low static pressures (0.50 in. or less). Industrial applications often include factories and warehouses. A variety of fan models offer flexibility for roof or wall mount as well as exhaust or supply. However, because the motors are moun[...]

  • Page 15

    High Static Pr essure V entilation Typical Applications Models SWB and BSQ are general, all-purpose fans that are capable of moving high air volumes against high static pressures (up to 5.0 in wg). High static pressures are generated by long or complex duct systems, especially when capture hoods are present. Both models can be used for either exhau[...]

  • Page 16

    Area Min./Chg. Area Min./Chg. Area Min./Chg. Assembly Hall 3-1 0 Dance Hall 3-7 Machine Shop 3-6 Attic 2-4 Dining Room 4-8 Mill 3-8 Auditorium 3-10 Dry Cleaner 2-5 Office 2-8 Bakery 2-3 Engine Room 1-3 Packing House 2-5 Bar 2-4 Factory 2-7 Projection Room 1-2 Barn 12-18 Foundry 1-5 Recreation Room 2-8 Boiler Room 1-3 Garage 2-1 0 Residence 2-6 Bowl[...]

  • Page 17

    Determining Static Pressur e (Ps) The pressures generated by fans in ductwork are very small. Yet, accurately estimating the static pressure is critical to proper fan selection. Fan static pressure is measured in inches of water gauge. One pound per square inch is equivalent to 27.7 in. of water gauge. Static pressures in fan systems are typically [...]

  • Page 18

    GB-200-5 (512-770) GB-180-7 (764-1055) GB-180-5 (700-940) 0.000 0.125 0.250 0.375 0.500 0.625 0.750 0.875 1.000 Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp STATIC PRESSURE / CAPACITY Preliminary Selections At this point we know the model, cfm and Ps. With this information we can refer to the GB performance chart[...]

  • Page 19

    Motor Horsepower The motor horsepower for direct drive fans is always sized by Greenheck and does not require further consideration. For belt drive models, the catalog identifies which horsepower is recommended. However, there are times when it is wise to bump the horsepower one size. For example, the hp recommended for the GB-180 at 810 rpm is 1/3[...]

  • Page 20

    Installation To ensure proper fan performance as cataloged, caution must be exercised in fan placement and connection to the ventilation system. Obstructions, transitions, poorly designed elbows, improperly selected dampers, etc., can cause reduced performance, excessive noise, and increased mechanical stressing. For the fan to perform as published[...]

  • Page 21

    F AN PERFORMANCE System Dynamics For a given flow rate (cfm), an air distribution system produces a resistance to airflow (Ps). This resistance is the sum of all static pressure losses as the air flows through the system. Resistance producing elements include ductwork, dampers, grills, coils, etc. A fan is simply the device that creates the pressur[...]

  • Page 22

    Combining Fan and System Dynamics The previous two sections introduced fan curves and system resistance curves. This section will show how these relate to each other to provide an understanding of the way the fan-system operates as a complete entity. Remember that a fan curve is the series of points at which the fan can operate at a constant rpm. L[...]

  • Page 23

    Adjusting Fan Performance There is a direct relationship between cfm and rpm within a system. Doubling the fan rpm will double the cfm delivered. Sample problem: The figure on page 21 showed a fan curve at 700 rpm which had an operating point of 1000 cfm at 0.25 in. Ps. What rpm is required to move 2000 cfm through the same system? Solution: Within[...]

  • Page 24

    In a steady-state system, as the fan rpm changes, cfm, Ps and BHp (horsepower) also change. The equations below, known better as fan laws, show the relationship between these performance parameters. cfm New = rpm New x cfm Old rpm Old Ps New = ( rpm New ) 2 x Ps Old rpm Old Bhp New = ( rpm New ) 3 x Bhp Old rpm Old The first two equations have alre[...]