Greenheck Fan 240XP-CUb User Manual

Fan Selection

Application-Based Selection

Performance Theory

SELECTING THE RIGHT FAN FOR THE JOB

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 different 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, this guide is constructed in three sections.

Section One describes how to select a fan using catalog performance tables with a given air volume and static pressure. This section also interprets Greenheck model numbers and illustrates the relationship between fan speed and airflow.

Section Two covers the basics of fan selection—determining the proper fan model, air volume, static pressure and loudness appropriate for a given application. This is important when your customer does not know the amount of air to be moved or the resistance to airflow that will be encountered. This section also illustrates proper fan installation and proper wheel rotation.

Section Three goes beyond fan selection with information of a more comprehensive and technical nature about air movement and air systems.

TABLE OF CONTENTS

SECTION 1

INTRODUCTION TO FAN SELECTION

Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Model Designation . . . . . . . . . . . . . . . . . . . . . .4

Reading Performance Charts . . . . . . . . . . . . . .5

Matching a Specification . . . . . . . . . . . . . . . . .7

Cross Reference Chart . . . . . . . . . . . . . . . . . . .8

SECTION 2

FAN SELECTION BASED ON FAN APPLICATION

Basic Overview. . . . . . . . . . . . . . . . . . . . . . . . .9

Commercial Kitchen Ventilation . . . . . . . . . . .10

General Commercial Ventilation . . . . . . . . . . .12

High Static Pressure Ventilation . . . . . . . . . .15

Determining CFM . . . . . . . . . . . . . . . . . . . . . .16

Determining Static Pressure . . . . . . . . . . . . .17

Sound Levels . . . . . . . . . . . . . . . . . . . . . . . . .19

Motor Horsepower . . . . . . . . . . . . . . . . . . . . .19

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Wheel Rotation . . . . . . . . . . . . . . . . . . . . . . . .20

SECTION 3

FAN PERFORMANCE

Fan Dynamics . . . . . . . . . . . . . . . . . . . . . . . . .21

System Dynamics . . . . . . . . . . . . . . . . . . . . . .21

Combining Fan and System Dynamics . . . . . .22

Adjusting Fan Performance . . . . . . . . . . . . . .23

Fan Laws . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

INTRODUCTION TO FAN SELECTION

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 select a fan? How are direct drive and

Terms

cfm - Cubic Feet Per Minute. A measure of airflow.

Ps - Static Pressure. Resistance to airflow measured in inches of water gauge.

sone - A measure of loudness. One sone can be approximated as the loudness of a quiet

refrigerator at a distance of 5 feet. Sones follow a linear scale, that is, 10 sones are twice as loud as 5 sones.

Bhp - Brake Horsepower. A measure of power consumption. Used to determine the proper

motor horsepower and wiring.

hp - Horsepower. Used to indicate a fan’s motor size.

rpm - Revolutions Per Minute. Measure of fan speed.

TS - Tip Speed. The speed of the tip of a fan wheel or prop measured in feet per minute.

AMCA - Air Movement and Control Association. A nationally recognized association which

establishes standards for fan testing and performance ratings. AMCA also licenses air volume and sound certified ratings.

belt driven fans different? What types of motors and accessories are used with these fans? Are there Greenheck fans that will match the size and performance of fans from other manufacturers? The goal is to understand and use the Greenheck literature as an important tool in filling a customer’s fan order.

Model Designation

For Greenheck belt drive models, the model designation tells the model type, size and the motor hp.

EXAMPLE: GB-090-6

Model is GB hp is 1/6

Nominal Wheel Dia. 9 in.

For direct drive units, the model designation tells the model type, the size and the motor/fan rpm.

EXAMPLE: G-121- B

Model is G rpm is 1140

Nominal Wheel Dia. 12 in.

The table below lists model designation suffixes for motor horsepower and fan rpm.

Belt Drive

Suffix Motor hp Suffix Fan rpm

6 4 3 5

7 10 1 E 1050 15 11/2 F 680 20 2 P 1625 30 3 50 5 75 71/2

/6 A 1725

/4 B 1140

/3 C 860

/2 D 1550

/4 G 1300

Direct Drive

Reading Performance Charts

The most important part of selecting a fan is the ability to read the performance charts. Most of the performance charts in the catalog are similar and are read in the same manner. Models RSF and BCF are

Belt Drive Selection

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 that slightly exceeds 1000 cfm. In this case, 1012 cfm is the first box that meets the requirements.

Note: Notice that each performance box is divided into 3 smaller boxes. The numbers refer to cfm, Sones and Bhp.

Example:

CFM

Sone Bhp

At this performance point, the sone value is 11.1 and the fan Bhp required is 0.16. Now by following the row to the left, we can determine fan rpm and fan model. In this case, the fan rpm is 1510 and the model is GB-090-4 which has a 1/4 hp motor.

Notice that the GB-090-4 is not the only model to choose from. If we follow the 0.250 in. Ps column down further, we find a performance point at 1010 cfm.

1012

11.1 0.16

exceptions to this rule. The selection procedure for these models is handled separately. Direct drive and belt drive fans are also addressed separately.

At this point, the sone value is 7.9 and the Bhp is 0.14. Following across to the left we find the rpm to be 1355. The model is GB-101-4-R1, which also has a 1/4 hp motor.

Both the GB-090-4 and the GB-101-4-R1 will perform the air movement task equally as well. However, the sound generated by the fan may have to be considered. Compare the sone values: 7.9 sones for the GB-101 and 11.1 for the GB-090. The GB-101 is about 30% quieter. Where a low sound fan is required, the GB-101 would be a better selection. If loudness is not a factor, the GB-090 would be a better selection because it is less expensive.

Another possibility for this particular selection is a GB-100-4-R2. Even though there is no performance box showing close to 1000 cfm, there are two performance boxes that bracket 1000 cfm. At 921 cfm the fan will be running at 1260 rpm. At 1269 cfm the fan will be running at 1635 rpm. Therefore, there is an rpm for this model that will correspond to 1000 cfm (obviously somewhere within the 1260-1635 rpm range). As with all Greenheck belt drive fans, intermediate cfm values are easily achieved by adjusting the motor pulley (see illustration on next page).

Table 2

MODEL

(rpm RANGE)

GB-090-4

(1290-1710)

GB-101-4-R1

(1020-1400)

GB-101-4-R2

(1260-1635)

GB-101-3

1/4

1/3

RPM

1360 3983

1510 4422

1710

1070 3116

1355 3946

1260

1635

1800 5242

5008

3669

4761

STATIC PRESSURE / CAPACITY

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

1030

10.1 0.11 9.9 0.12 9.6 0.12 9.3 0.12 8.8 0.13 8.5 0.13 1144

0.15 11.2 0.16 11.1 0.16 10.7 0.17 10.4 0.17 10.0 0.17 9.8 0.17 9.5 0.17

11.4 1295 1237 1179 1121 1061 999 934 866 785

13.4 0.22 13.3 0.23 13.2 0.23 13.0 0.24 12.7 0.24 12.4 0.25 12.1 0.25 11.8 0.25 11.6 0.25

906

6.0 0.060 5.4 0.065 5.0 0.070 4.3 0.070 1148 1077 1010 943 856 739

0.12

8.5 1067 991 921 840 735 385

0.099 7.1 0.104 6.8 0.112 6.5 0.115 5.9 0.115 4.4 0.083

7.6 1385 1325 1269 1214 1161 1094 1019 928 792

11.1 0.22 10.8 0.22 10.4 0.23 10.2 0.24 9.8 0.25 9.3 0.25 8.9 0.25 8.4 0.25 7.8 0.24 1525 1471 1418 1367 1320 1270 1208 1141 1064

0.29

13.2

8.1

12.8

957

1078

818

0.13

0.30

884

1012 946 875 800 720 607

731

7.9 0.14 7.8 0.14 7.2 0.14 6.8 0.14

0.30

12.5

807

607

0.31 12.2 0.33 11.3 0.33 10.8 0.33 10.6 0.33 10.1 0.33

12.3

725

632

One advantage of choosing the GB-101-4-R2 over the GB-101-4-R1 is that it is capable of running at higher rpm’s, which enables the fan to move more air if necessary.

Motor pulleys are adjusted by loosening the set screw and turning the top half of the pulley (see illustrations at right). This causes the pulley diameter to change, which results in changing the fan rpm.

Direct Drive Selection

Selection of direct drive fans (those with the motor shaft connected to the fan wheel or propeller) is nearly the same as belt drive selection. However, there are two differences worth noting. Where belt drive fan speed can be altered by adjusting the motor pulley, direct drive fans (since they have no pulleys) must use a different method.

1. To adjust a direct drive fan's speed (also motor speed) or to provide a means of meeting an exact performance requirement, a speed control can be furnished. Speed controls vary the voltage supplied to the fan and slows it down; a principle similar to the way dimmer light switches work.

Belt

Opening the pulley decreases fan rpm. Closing the pulley increases fan rpm.

2. Models CUE and CW, sizes 060-095 and Model SQ, sizes 60-95, are provided with 115 volt, 60 cycle motors. The three speeds are 1550 rpm (D), 1300 rpm (G) and 1050 rpm (E). Changing a motor lead is all that is necessary to change speeds. When selecting a model with 3 speed motors, it is recommended that the G speed be chosen whenever possible. This is the middle speed, which gives the greatest flexibility in air volume because airflow can be increased or decreased simply by changing a motor lead.

Typical Motor Tag

Electrical Instructions

Suffix Letter Motor Speed Wiring Connections

D 1550 rpm White to L1 Black to L2 G 1300 rpm White to L1 Blue to L2 E 1050 rpm White to L1 Red to L2

Motor Information (Belt Drive Only)

When specifying a belt drive fan, the model designation does not completely describe the unit. Additional information about the motor is necessary. These items are listed below:

Motor Enclosure

This will be either “Open” (open, drip proof), “TE” (totally enclosed) or “EXP” (explosion resistant). Open is the most common and will be supplied unless otherwise specified.

Speeds

Motors are available in either single speed or two speed. Single speed motors are 1725 rpm. Two speed motors will be 1725/1140 rpm. Single speed will be supplied unless otherwise specified.

Electrical Characteristics

Voltage and phase. Voltage can be 115, 208, 230 or

460. Phase is either single or 3 phase. A 115 volt, single phase motor is shown as 115/1. Typically, motors of 1/2 hp and less are single phase. Motors of 3/4 hp and greater are 3 phase.

Accessories

Most fans are ordered with accessories. Here are some common accessories for selected models:

Model Common Accessories

G & GB

CUBE

Roof Curb Backdraft Damper

Roof Curb Grease Trap

Wall Mount Housing or Wall Mount Collar

Model Common Accessories

SP & CSP

SQ & BSQ

Speed Control Discharge Vents

Backdraft Damper Vibration Isolators

Matching a Specification

There will be times when a Greenheck model will have to be matched to a competing manufacturer’s unit. To aid in these circumstances, we have provided a cross reference chart which includes our nine most common competitors. If the manufacturer you need is not on this chart, contact Greenheck for assistance.

To use the cross reference chart, on next page, start with the manufacturer at the top. Then follow down until the model in question is found. Follow across to

the left to determine which Greenheck model is equivalent. Once this is determined, refer to the Greenheck catalog to find the best size to meet the specified performance.

Hint: Typically, when matching a Greenheck fan to a competitive model, the size should also be matched. If you are unsure of the size of the competitive unit, compare fan rpm. Fans of equal size should move approximately the same amount of air.

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, and the fan industry historically catalogs forward curved fans in this fashion.

Sample problem:

Choose the fan size and appropriate motor horsepower to move 980 cfm against 0.625 in. Ps.

Solution: (Refer to table below)

The first row in the chart corresponds to 980 cfm. Follow across to the right to the 0.625 in. Ps column. The performance box reveals that size 90 will meet this performance at 893 rpm and will require 0.20 Bhp.

Motor hp selection for forward curved fans is more

complicated. The Bhp is only 0.20, which suggests that a 1/4 hp motor is adequate. However, forward curved fans draw more horsepower at low Ps than at high Ps. Assume this fan was running at about 893 rpm, but instead of 0.625 in. Ps, it was operating at only 0.25 in. Ps. The new performance box in the 0.25 in. Ps column reveals 894 rpm at 0.45 Bhp. The airflow would then be 1860 cfm.

Notice that as the Ps was reduced from 0.625 in. to 0.25 in., the Bhp increased from 0.20 to 0.45. This would burn out the 1/4 hp motor quickly. With this in mind, it is good practice to size RSF and BCF motors at least one size larger than necessary based on the Bhp value in the performance box, especially if the estimated Ps is questionable.

For this case, an RSF-90-3 (1/3 hp motor) would be a good selection if we had confidence in the estimated Ps. Otherwise, use an RSF-90-5 (1/2 hp motor).

RSF-90-4 (1/4 hp motor) is not recommended for this job.

MODEL

RSF-90

RSF-100

CFM

980 1065

1200

1420 1543

1640 1783

1860 2022

2080 2261

1240 1097

1780

2140

1304

1575

1894

rpm

Bhp

rpm

Bhp

rpm

Bhp

rpm

Bhp

rpm

Bhp

rpm

Bhp

rpm

Bhp

rpm

Bhp

rpm

Bhp

STATIC PRESSURE / CAPACITY

0.125 0.250 0.375 0.500 0.625 0.750 1.000 1.250 1.500 1.750

521 630 725 812 893 967

0.08 0.11 0.13 0.16 0.20 0.23

593 685 771 849 925 994 1125

0.13

668

0.19 0.23 0.27 0.31 0.35 0.39 0.48 0.57 0.67

746 819 887 953 1016 1077 1191 1298

0.28

828 894 954 1014 1073 1128 1236

0.40 0.45 0.50 0.55 0.60 0.65 0.76

910 970 1027 1080 1134

0.54 0.60 0.66 0.71 0.77

476 572 656 733 807 876

0.10

605 679 748 813 873 931 1040 1143 1240

0.24 0.29 0.33 0.38 0.42 0.47 0.56 0.66 0.77

699

0.40 0.45 0.50 0.56 0.61 0.67 0.78 0.89 1.00 1.12

0.16 0.19 0.23 0.26 0.30 0.38

747

0.33

0.13

763

825

0.37

0.16

823 880 935 989 1086 1181 1269 1354

898

0.42 0.46 0.51 0.61 0.71

0.19

966

0.23

1031

0.27

1153

1267 1371

Cross Reference Chart

(Models in italics refer to older models)

Greenheck

CE,CX,CH

CDE, CBX

Cook

Updated 12-7-2004

ACED

C-D,CVD,TCD

ACEB

C-B,TCB,UCB

Penn Acme

Domex DX

XQ,XR,AT,AW

Domex DXB

KB,JB,MB,AB,LB

PRN CRD VEDK

PN,PNN,PV NBCR

CUE ACRUD, VCRD Fumex FX PDU n/a VUDK CUD, UBD n/a DU CUBE

UCBE,UCBH

SW,GW

CWB

GWB

ACRUB,VCR

URB,R-B,BTD

ACWD

ACWB

CWB,TWB

SP Gemini GC Zephyr

CSP Gemini Inline GN Zephyr

DSQ,SQD

SQID,SQND

CV-D

BSQ SQIB,SQNB,

Fumex FXB

FMXB

Fumex WFX

Domex WX,WA,WB

Fumex WFXB

Domex WCB,WLB

PNU

PUB,PU,PUH

PDU-W

PNU-W

PWB

VQ/VQL J,EC,L VCDB,VCDC,

Z, (RA,TD)

VQ/VQL n/a VCDB IL DCF n/a

Z, (TDA)

Centrex SX XD ISD

Centrex SX-BC XB ILB VIBK

SQN-HP

SE/SS

SDE

SWD

P FQ GDW

SCE/SCS AWD BC FN n/a LRDA,LNDA CDC HV, HVE

SBE/SBS

SPFE/SPFS

SBE/SBS-3

SPNE/SPNS

XLW,XMW

SWB SPB

BBK,BFL DC TBW LWBK,LMBK

XLWH,XMWH BF DCH LBW LJDB, LKDB,

SBCE/SBCS AWB BC,BAT DCK, K HBW LRBA,LNBA CBC HA

RBS/RBE

RPE,RPS

HXSL, HXSM, HXEL, HXEM

AF EC/EC-S n/a LTBA,LGBA PB n/a n/a

RBCE/RBCS HEE,HES AC EC, ECH HBRE,HBRS n/a PBC n/a n/a RE/RS HEE-D/HES-D AF n/a n/a LTDA,LGDA PD n/a n/a RBU

PBU,PUB

LEU, LXUL, LXUM

AVB,VB

HF,HS,HZ

(cast)

UBG BRU LUBA JBH,JBC

RBUMO SUBH, SUB HX UBH available LUKA n/a RUBDX

RDU AUD HZ,HC UD DRU LUDA JDC UP

RSF ASP

CFS

Muffan MU AFSN

PLS

RSFP ASP-T n/a AFSL n/a VHBB n/a n/a n/a SFD CPF-D n/a FCE FCD n/a n/a UDF n/a SFB CPF-B n/a FCF, FCD,

FCA

SWB CPV,CPS Dynamo D,QX

GWB

QBR JVS VBBA VSBC UXB BI

Jenn

(Breidert)

(Stanley)

Carnes

VEDB,VEDC

VEBK

BCR

NBTD

NBRTD

VEBC

VUBK,VRBK

VUBB,URBA

CWD VWDK

VWDB

NBTD

NBRTD (UL 762)

VWBK

VWBB

VCDD

VIDK

ILD

VIDB,AMDA

COOLAIR

(ILG)

AirMaster

(Chelsea)

CRD CDD

RDD

CRB

LSB

UBC,CUB

CVB

CWD

CWF

CBD

RDB

CBU

CUBA

CDU

WDC

CWB CBU

WBC

CF NCF

SQDA

CLD

n/a CVIDK

Captive Aire

NCA

CFA

SQBA SBCL CVIBK

VIBA

HDW,FDW

LYDK,LZDK

LWDA

UDU/UDFPVEPR

WFA

C-EPR

n/a

PLFA

TYPE T

CBL,CBHPFHA

IND, FHA

CPB

CBHX n/a n/a

LRDA, LNDA

n/a

IND

(cast)

UPB

RUBA

CUPB

n/a

(cast)

CUPD

RUDA

BCFS VSBB

VSBA

CFS CAS n/a

FCB VFBA VSFC UXF n/a

(Flow Air)

Competitor Model Number Deciphering Hints

Cook-

Direct Drive 120 W 10 D

Direct Drive

rpm x 100

Model ACW

Wheel Size

Letter Designations C=ACE (G,GB) R=ACRU (CUBE) W=ACW (CW,CWB) V=VCR (CUBE)

Belt Drive 150 V 6 B

Belt Drive

3/4 hp

Model VCR

Wheel Size = 15 in.

Horsepower Designations

=1/6 hp

2 3=1/4 4=1/3

=1/2

6 7=1 8=1

1 11=5 12=7

Acme -

Direct Drive PW 135 A 8

860 rpm

1/20 hp

Wheel Size =13.5 in.

Model PW

Direct Drive rpm Designation

8 = 860 rpm 6 = 1160 rpm 4 = 1725 rpm

Belt Drive PNN 163 G

1/2 hp

Wheel Size = 16.3 in.

Model PNN

Horsepower Designation

1/20 hp

A B=1/12 C=1/8

1/6

D E=1/4

F G=1/2 H=3/4

J K=1

1/3

L M=3 N=5

R=10

+ 16 hidden pages