BIRD DA25 VHF Series Owner's manual

Brand: BIRD

Model: DA25 VHF Series

Type: Owner's manual

This manual is also suitable for

DIGITAL AIR™

LOAD RESISTORS

Operation Manual

by Bird Technologies Inc.

Instruction Book Part Number 920-8579AS Rev. L

Thruline

is a Registered Trademark and

Digital Air™ is a Trademark of Bird Electronic Corporation

DigitalAirLoadResistors

Safety Precautions

Thefollowingaregeneralsafetyprecautionsthatarenotnecessarilyrelatedto

anyspecificpartorprocedure,anddonotnecessarilyappearelsewhereinthis

publication.Theseprecautionsmustbethoroughlyunderstoodandapplytoall

phasesofoperationandmaintenance.

WARNING

KeepAwayFromLiveCircuits

OperatingPersonnelmustatalltimesobservegeneralsafetyprecautions.Do

notreplacecomponentsormakeadjustmentstotheinsideofthetest

equipmentwiththehighvoltagesupplyturnedon.Toavoidcasualties,always

removepower.

WARNING

ShockHazard

DonotattempttoremovetheRF

transmissionlinewhileRFpowerispresent.

WARNING

DoNotServiceOrAdjustAlone

Undernocircumstancesshouldanypersonreachintoanenclosureforthe

purposeofserviceoradjustmentofequipmentexceptinthepresenceof

someonewhoiscapableofrenderingaid.

WARNING

SafetyEarthGround

Anuninterruptibleearthsafetyground

mustbesuppliedfromthemain

powersourcetotestinstruments.Groundingoneconductorofatwo

conductorpowercableisnotsufficientprotection.Seriousinjuryordeathcan

occurifthisgroundingisnotproperlysupplied.

WARNING

Resuscitation

Personnelworkingwithornearhighvoltagesshouldbefamiliarwithmodern

methods

ofresuscitation.

WARNING

RemovePower

Observegeneralsafetyprecautions.Donotopentheinstrumentwiththe

poweron.

SafetyPrecautions

Safety Symbols

Thissymbolindicatesthatashockhazardexistsiftheprecautionsin

thein

structionmanualarenotfollowed.

Thecautionsymbolappearsontheequipmentindicatingthereis

importantinf

ormationintheinstructionmanualregardingthat

particulararea.

Thissymbolindicatesthattheunitradiatesheatandshouldnotbe

touchedwhi

lehot.

Note: Callsattentiontosupplementalinformation.

Warning Statements

Thefollowingsafetywarningsappearinthetextwherethereisdangerto

operatingandmaintenancepersonnel,andarerepeatedhereforemphasis.

Seepages8and.22.

Seepages12and13,

Seepage14.

WARNING

rningnotescallattentiontoaprocedure,whichifnotcorrectlyperformed,

couldresultinpersonalinjury.

CAUTION

Cautionnotescallattentiontoaprocedure,whichifnotcorrectlyperformed,

couldresultindamagetotheinstrument.

WARNING

TurnoffACpowerandRFpowerbeforeremovingorreplacingtheaccess

panel;thepot

entialforelectricalshockexists.

WARNING

Ensurethepoweristurnedoffwhenattachingpowercableorwire.

WARNING

NeverattempttoconnectordisconnectanRFcableorlinewhilepowerison

attheRFpowersource.RadiatedRFenergyisapotentialhealthhazard.

DigitalAirLoadResistors

iii

Seepage16.

Seepages19.

Seepage22.

Caution Statements

Thefollowingequipmentcautionsappearinthetextwhenevertheequipmentis

indangerofdamageandarerepeatedhereforemphasis.

Seepage7.

Seepage9.

WARNING

Exhaustedairmayexceed95°C(203°F).

WARNING

DisconnectthisunitfromtheRFpowersourcesandtheaclinebeforeany

disassembly.Thepotentialforelectricalshockexists.

WARNING

Improperwiringcouldresultinelectricshockanddeath.

WARNING

Highheatpresentinsideunit!Letcoolforatleast10minutesbeforeservicing

orsevereburnscouldresult.

WARNING

Maintenancebyotherthantrainedservicepersonnelcouldresultinelectric

shock.

CAUTION

Donotblockairflow.Airisforcedintothehousingviafansonallfoursides

andexhauststhroughagrilleonthelowerrearoftheunit.Blockingairinputs

orexhaustcould

causeunitfailure.

CAUTION

Connectinterlockbefor eRFoperation.

SafetyPrecautions

Seepage12.

Seepage16

CAUTION

Seepag

e17.

Seepage17.

Seepage22.

CAUTION

Che

ckthelocalelectricalcodeforproperAChookuppriortooperationofthe 

unit.Makesuretheneutralorreturnhookupisonlyusedforthatpurpose.

CAUTION

DonotoperatewithoutACpowertotheload.

Dono

toperateabovetheratedcapacity.See “Specifications”onpage25.if

unsureoftheratingthemodelload.Theunitwillhandleasmallpercentage

ofoverloadforbriefperiodsoftimeduringtransmittertuningoradjustment.

However,longperiodsofoverload(>10%ofratedpowerfor>30min)ma

y

damagetheunitorcausethetemperatureinterlocktoopen.

CAUTION

ApplyingmorethantheratedaverageRFpowertotheloadmaydamagethe

loadresistor.

CAUTION

DonotdisconnectAClinepowerbeforeturningoffRFpowertotheload.

ApplicationoffullRFpowertotheloadwhi

lethefansarenotrunningwill

causetheloadtooverheatanddestroytheresistorelements.

CAUTION

Improperwiringcoulddisableload.

CAUTION

Donotdisablefans.Appl icationoffullRFpowertotheloadwhiletheair

circulationisoffwillcausetheloadtooverheatanddestroytheresistor

elemen

ts.

DigitalAirLoadResistors

Seepage22.

CAUTION

Allreplacementwiringmustbe18AWG,withinsulationratedto400°F

(205°

 C).Useofotherwiringcouldresultinunitdamage.

CAUTION

Thiscircuitdiagramforusebytrainedservicepersonnelonly.Improperuse

coulddisableload.

SafetyPrecautions

Safety Statements

USAGE

ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY

THE MANUFACTURER MAY IMPAIR THE INSTRUMENT’S SAFETY

PROTECTION.

USO

EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA

POR EL FABRICANTE, PUEDE ANULAR LA PROTECCIÓN DE

SEGURIDAD DEL INSTRUMENTO.

BENUTZUNG

WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM

HERSTELLER BESCHRIEBEN, KANN DIE GERÄTESICHERHEIT

BEEINTRÄCHTIGT WERDEN.

UTILISATION

TOUTE UTILISATION DE CET INSTRUMENT QUI N’EST PAS

EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT

ENDOMMAGER LE DISPOSITIF DE PROTECTION DE

L’INSTRUMENT.

IMPIEGO

QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO

DIVERSO DA COME SPECIFICATO DAL PRODUTTORE LA

PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA.

DigitalAirLoadResistors

vii

SERVICE

SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE - TRAINED

PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO

NOT PERFORM ANY SERVICING UNLESS QUALIFIED TO DO SO.

SERVICIO

LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO

DEL PERSONAL DE SERVICIO CAPACITADO. PARA EVITAR EL

PELIGRO DE DESCARGAS ELÉCTRICAS, NO REALICE NINGÚN

SERVICIO A MENOS QUE ESTÉ CAPACITADO PARA HACERIO.

WARTUNG

ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES GELTEN NUR

FÜR GESCHULTES FACHPERSONAL. ZUR VERMEIDUNG

GEFÄHRLICHE, ELEKTRISCHE SCHOCKS, SIND

WARTUNGSARBEITEN AUSSCHLIEßLICH VON QUALIFIZIERTEM

SERVICEPERSONAL DURCHZUFÜHREN.

ENTRENTIEN

L’EMPLOI DES INSTRUCTIONS D’ENTRETIEN DOIT ÊTRE RÉSERVÉ

AU PERSONNEL FORMÉ AUX OPÉRATIONS D’ENTRETIEN. POUR

PRÉVENIR UN CHOC ÉLECTRIQUE DANGEREUX, NE PAS

EFFECTUER D’ENTRETIEN SI L’ON N’A PAS ÉTÉ QUALIFIÉ POUR CE

FAIRE.

ASSISTENZA TECNICA

LE ISTRUZIONI RELATIVE ALL’ASSISTENZA SONO PREVISTE

ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE

ADDESTRATO. PER EVITARE PERICOLOSE SCOSSE ELETTRICHE

NON EFFETTUARRE ALCUNA RIPARAZIONE A MENO CHE

QUALIFICATI A FARLA.

SafetyPrecautions

viii

CONNECT INTERLOCK TO TRANSMITTER BEFORE OPERATING.

BRANCHER LE VERROUILLAGE À L’ÉMETTEUR AVANT EMPLOI.

CONECTE EL INTERBLOQUEO AL TRANSMISOR ANTES DE LA

OPERACION.

VOR INBETRIEBNAHME VERRIEGELUNG AM SENDER

ANSCHLIESSEN.

PRIMA DI METTERE IN FUNZIONE L’APPARECCHIO, COLLEGARE

IL DISPOSITIVO DI BLOCCO AL TRASMETTITORE.

DigitalAirLoadResistors

About This Manual

ThisinstructionbookcoversBirdDigitalAirLoadResistorModels:

Changes to this Manual

Wehavemadeeveryefforttoensurethismanualisaccurate.Ifanyerrorsare

discovered,orifthereareanysuggestionsforimprovingthismanual,please

sendcommentstoourSolon,Ohiofactory.Thismanualmaybeperiodically

updated.Wheninquiringaboutupdatestothismanualrefertothepart

number

andrevisiononthetitlepage.

ThemostrecentrevisionofthismanualcanbefoundonBird’swebsite:

http://www.birdrf.com.

DA5F15 DA5U15 DA5UR15

DA5F30 DA5U30 DA5UR30

DA10F15 DA10U15 DA10UR15

DA10F30 DA10U30 DA10UR30

DA15F15 DA15U15 DA15UR15

DA15F30 DA15U30 DA15UR30

DA25F15 DA25U15

DA25F30 DA25U30

DA25-4U15

DA25-4U30

DA40F15 DA40-5U15

DA40F30 DA40-5U30

DA10V1F15 DA10V1U15 DA10V1UR15

DA10V1F30 DA10V1U30 DA10V1UR30

DA10V3F15 DA10V3U15 DA10V3UR15

DA10V3F30 DA10V3U30 DA10V3UR30

DA25V3F15 DA25V3U15 DA25V3UR15

DA25V3F30 DA25V3U30 DA25V3UR30

DA25V4U15

DA25V4U30

AboutThisManual

Chapter Layout

Introduction —

DescribesthefeaturesoftheDigitalAirLoad,listsequipment

suppliedandoptionalequipment,andprovidespower‐upinstructions.

Installation — Describeshowtosetuptheloads,reviewsfeaturesofthe

DigitalAirLoadthathelpininitialuse,andprovidespower‐upinstructions.

Operating Instructions — Describesbasicuseandvariousmodesof

operation.

Maintenance — Listsroutinemaintenancetasksaswellastroubleshootingfor

commonproblems.

Theory of Operation — DescribeshowtheDigitalAirloadswork.

Specifications — Listsspecificationsandpartsinformation.

Table of Contents

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i

SafetySymbols...... ................ ................ ..........

.. ii

WarningStatements............................ ................. ii

Caution

Statements................ ................ ..............iii

SafetyStatements..

.............................. ...............vi

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

ChangestothisManual.

............... ................ ...........ix

ChapterLayout.......

....................................... x

Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description ..........

........................................... 2

Chapter 2 Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

RFSectionDescription...

........................................ 4

HeatRemoval........

........................................ 4

FanActivation........

.............................. ......... 4

ThermalInterlock.........

................................... 5

LinePowerInterlock............

.............................. 5

Chapter 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

UnpackingandInspection................

......................... 6

UnitPlacement..... ................ ..

............... ........... 6

DuctingPlacement... .. .................

............... ......... 7

AccessPanel..................... ...

............................ 8

InterlockConnection ....................

......................... 9

SixTerminalInterlockwithPowerRelay ....... ............

....... 9

SixTerminalInterlockwithout PowerRelay ...................... 11

TwoTerminalInterlock ............

........................... 11

ACPowerHookup....................

.......................... 12

ACPowerCable.....................

........................ 12

ACPowerCableStrainRelief.................. ...

................ 13

ACHardWiring..................... ..........

................. 13

EarthGroundingLug..............................

........... 13

ConnectingRFPower....................................

....... 14

TableofContents

xii

SwivelFlangedCoupling............ .......................... 14

UnflangedCoupling ....

...................................... 14

4‐1/16”Coupling .........

................................... 15

Chapter 4 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

AutomaticMode............

................................... 16

ManualMode.......... ...

............... ................ ...... 16

LoadOperation...........

............... ................ ... 16

InterlockOperation ..............

............... ............. 17

ManualShutDown...................

............... ........ 17

AutomaticShutDown . .......................

................ 18

MeasurementandMonitoringofRFPower......................... 18

Chapter 5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Troubleshooting.

............................................... 19

CleaningandInspection

................................... ...... 20

PreparationforStorageorShipment....

........................... 20

Storage ................. .....

..............................  20

Shipment...................

............................... 20

CustomerService..... ............

..............................  21

CircuitDiagram..................

..............................  22

Specifications ...................

............................... 25

Appendix 1 Difference Data Sheet 29

Specificationsfor12.5kWDigitalAirLoad...........

...............  29

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chapter 1 Introduction

Figure 1 Digital Air Outline Drawing

Series Dim. A Dim. B Dim. C Dim. D Dim. E Dim. F Dim. G

DA10V 23.5”

(597mm)

23.5”

(597mm)

49.5”

(1257mm)

59”

(1499mm)

N/A

†

† Forklift openings are not provided for these models.

N/A

†

N/A

†

DA25V 27.0”

(686mm)

27.0”

(686mm)

50.8”

(1289mm)

61.0”

(1549mm)

N/A

†

N/A

†

N/A

†

DA5 17.0”

(432mm)

17.0”

(432mm)

55.5”

(1410mm)

64.0”

(1626mm)

N/A

†

N/A

†

N/A

†

DA10 19.5”

(495mm)

19.5”

(495mm)

60.0”

(1524mm)

68.5”

(1740mm)

N/A

†

N/A

†

N/A

†

DA15 25.0”

(635mm)

25.0”

(635mm)

68.0”

(1727mm)

76.5”

(1943

mm)

24.5”

(622mm)

6.0”

(152mm)

2.0”

(50.8mm)

DA25 27.0”

(686mm)

27.0”

(686mm)

68.0”

(1727mm)

76.5”

(1943mm)

24.5”

(622mm)

6.0”

(152mm)

2.0”

(50.8mm)

DA40 27.5”

(701mm)

27.5”

(701mm)

78.8”

(1999mm)

84.0”

(2134mm)

24.5”

(622mm)

6.0”

(152mm)

2.0”

(50.8mm)

Introduction

BirdDigitalAirLoadResistorsareaircooledandcapableofdissipatingRFline

powerupto40kW(dependingonthemodel).Virtuallymaintenancefreeand

simpletooperate,thisunitshouldprovideyearsoftroublefreeoperation.

Description

Theunitissupportedbyfourbumperfeet.TheRFinputconnectorislocatedon

thetopoftheunit. Fansonallfoursidesallowforforcedaircoolingofthe

resistors.Thetransmitterinterlockislocatedonthefrontpanel.Themodel

numberisprintedonalabelon

thelowerleftoftheunit.

Theunitisnot intendedforexposedoutdooruse,orinareasofcondensing

humidity.Ensureadequatespaceisavailableforaircirculation.

TheDigitalAirLoadResistorsareofferedinavarietyofformsdifferingintheir

powerratings,acinputpowerrequirements,frequencyranges,andconnector

types(see

Figure2onpage3

formodelnumbers).

Example‐AModelDA10F15isaUHF10kWloadwitha3‐1/8”

flangedconnectorthatrequiresa115V50/60Hzpowersource.

DigitalAirLoadResistors

Figure 2 Digital Air Load Models

Model Number

Power Connector Freq. Range

Flanged,

115 VAC

Unflanged,

Flush

115 VAC

Unflanged,

Recessed

115 VAC

Flanged,

230 VAC

Unflanged,

Flush

230 VAC

Unflanged,

Recessed

230 VAC

5kW 3‐1/8”EIA 470‐890MHz DA5F15 DA5U15 DA5UR15 DA5F30 DA5U30 DA5UR30

10kW 3‐1/8”EIA 470‐890MHz DA10F15 DA10U15 DA10UR15 DA10F30 DA10U30 DA10UR30

15kW 3‐1/8”EIA 470‐890MHz DA15F15 DA15U15 DA15UR15 DA15F30 DA15U30 DA15UR30

25kW 4‐1/16”Myat 470‐890MHz DA25F15 DA25U15 DA25F30 DA25U30

25kW 4‐1/2”IEC 470‐890MHz DA25‐4U15 DA25‐4U30

40kW 4‐7/8 ” IEC 470‐890MHz DA40‐5U15 DA40‐5U30

40kW 6‐1/8”EIA 470‐890MHz DA40F15

10kW 1‐5/8 ” EIA DC‐240MHz DA10V1F15 DA10V1U30 DA10V1UR30

10kW 3‐1/8”EIA DC‐240MHz DA10V3F15 DA10V3U30 DA10V3UR30

25kW 3‐1/8”EIA DC‐240MHz DA25V3F15 DA25V3U30 DA25V3UR30

25kW 4‐1/2”IEC DC‐240MHz

DA40F30

DA10V1U15 DA10V1UR15 DA10V1F30

DA10V3U15 DA10V3UR15 DA10V3F30

DA25V3U15 DA25V3UR15 DA25V3F30

DA25V4U15

DA25V4U30

Chapter 2 Theory of Operation

TheDigitalAirSeriesLoadsarehighpowered,air‐cooled,RFloadsusedfor

terminationofcoaxialtransmissionlines.TheRFenergy,whenconvertedinto

heat,istransmittedtothesurroundingareabyaforcedairsystem.

RF Section Description

TheRFsectionofaDigital Airloadisabroadb andtuneddevicecomposedof

tubularceramicresistors.Thesearecarefullypositionedtoproduceavery

uniformandalmostreflectionlesslineterminationoverthestatedfrequencies

oftheloadresistor.

Heat Removal

Wheninoperation,airisforcedintoallfoursidesoftheunitanddirectedover

theRFresistornetwork.Thehea t,developedintheresistorsfromdissipationof

RFenergy,iscarriedoffbytheflowofairovertheresistorssurface.Thehotairis

thenexhaustedthroughthe

grill einthebackofthe unit.

Fan Activation

ThefansontheDigitalAirloadsaretriggeredwithapairofnormallyopensnap

diskthermoswitches.ThetopswitchislocatedintheRFchamber,whilethe

bottomswitchislocatedintheairexitduct.Insteadystateoperation,afancycle

happensasfollows:

1. RisingairtemperatureintheRFchamberclosesthetopthermoswitch,

turningthefanson.

2. Thehotairisforcedintotheexitductbythefans,heatingthebottom

thermoswitchuntilitcloses.

3. AsthecoolairisblownintotheRFchamber,thetopswitchreopens.Since

thebottomswitchisclosed,thefansstayon.

4. WhenRFpowerisremoved,coolairreachestheexitduct,thebottom

switchopensandthefansturnoff.

Forpowerlevelssubstantiallybelowtheunit’spowerrating,theairintheexit

ductmaynotheatupsufficientlytoclosethebottomswitch.Asaresult,the

fanscycleonandoffmoreoften.Forthesepowerlevels,itisrecommendedthat

theunitbeoperatedinmanualmode.

DigitalAirLoadResistors

Thermal Interlock

AllDigitalAir loadsaresupplied withapassive,normallyclosed,snapdisk

overtemperaturethermoswitch.Normallyclosed,theswitchopensabovethe

maximumsafeloadtemperature,turningoffthetransmitterpower.Because

dissipationoftheheatgeneratedbytheRFpowerdependsuponforcedair

cooling,ifairflowovertheresistor

arrayshouldstoporberestrictedthe

temperatureintheRFchambercanrisebeyondasafelimit.Theheatsensorwill

sensethechangeandactuatetheinterlockswitchtoturnoffthetransmitter.

Theinterlocksystemwillnotpermitre‐operationofthetransmitteruntila

lower,safe

temperatureintheRFhousingisreached.

Line Power Interlock

DigitalAirloadsareequippedwithalinepowerfailureinterlocktoprovide

protectionagainstthelossofACpower.Theswitchisanormallyclosedrelay.

Theswitchopensifnolinepowerissuppliedtotheload,thebreakerontheload

istripped,orthepowerswitchon

theloadhasbeenturnedoff.Whenpoweris

restored,theinterlockwillreset.

Chapter 3 Installation

Thischapterprovidesinformationforon‐siterequirements,unpacking,

inspection,andpreparingtheDigitalAirloadforuse.

Unpacking and Inspection

1. Carefullyinspectshippingcontainerforsignsofdamage.

 Iftheshippingcontainerisdamaged,donotunpacktheunit.

ImmediatelynotifytheshippingcarrierandBirdTec hn o logies.

 Iftheshippingcontainerisnotdamaged,unpacktheunit.Save

shippingmaterialsforrepackaging.

2. Inspectunitforvisualsignsofdamage.

Note: Ifthereisdamage,immediatelynotifytheshippingcarrier

andBirdTechnologies.

Unit Placement

Refertotheguidelinesinthissectionwhenplacingtheload.Handlesare

providedforallmodels.Forkliftopeningsareprovidedforlargermodels(see

Figure1

).Placementofthesemodelswithouttheuseofaforkliftisnot

recommended.

 Donotuseinexposedoutdoorlocationsorinareasofcondensing

humidity.

 Surroundingairmustbefreeofcontaminantsorparticlesthatcouldbe

drawnintotheairintakes.

 DigitalAirloadshavenointermediatedielectricfluidorcoolant.No

waterhookupsarerequired.

 DigitalAirloadsaredesignedtobeusedupright.

Note: Consultthefactoryforotherintendedorientations.

DigitalAirLoadResistors

Makesurethefollowingopenairrequirementsaremet:

 Donotplacetheunitinasmallroomorclosetwithoutproper

ventilation.

Note: Inrestrictedareastheheatgivenoffbytheunitmay

increasetheambienttemperaturetoanunacceptablelevel.

 Fanintakeopeningsshouldbeatleast4inchesfromwallsand

obstacles.

Note: Intakeairshouldnotexceedmaximumambienttempera‐

turesof45°C.

 Theairexitductshouldbeatleast24inchesfromwallsandobstacles.

 Donotplacetemperaturesensitiveequipmentneartheairexit,or

equipmentthatwillbeaffectedbyariseinambientairtemperature.

Note: Exitairtemperaturescanreachinexcessof95°Cdepending

onenvironmentalconditions.

Ducting Placement

Ductingtheunitexhaustisrecommendedforlargermodels.Mountingnutsare

providedontherearoftheunitforducting.Referto

Figure3

forthelocationof

themountingnuts.

Shouldanexternalductbedesired,makesurethefollowingrequirementsare

met:

 Maximum0.2"H

Opressureriseat45°Cambient.

 Allductsshouldbeatleasttheareaoftheairexitductontheunit.

Referto

Figure3

 Ninetydegreeelbowsgoinguptotheceilingmay beginimmediatelyat

theloadexit.However,theyshouldhaveaminimum4inchradius,>15

inchespreferredandshouldtransitiontoalargerarea.

 Ninetydegreeelbowsintothefloororatrightanglestothefloor

shouldstartaminimum5inchesfromtheloadexitandshouldhavea 

minimum4inchradius,>15inchespreferredandshouldtransitiontoa

largerarea.

CAUTION

Donotblockairflow.Ai r isforcedintothehousingviafans

onallfoursidesandexhauststhroughagrilleonthelower

rearoftheunit.Blockingairinputsorexhaustcouldcause

unitfailure.

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BIRD DA25 VHF Series Owner's manual

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