BENSON VRC-3 20-3 Manual

1704VRC3‐AMEN,p.1/35
1704VRC-3AMEN
Gas‐fired,balancedflueor
power‐ventedunitheater
VRC‐3
20‐3,30‐3,45‐3,60‐3
75‐3,100‐3
ThisappliancemeetsthefollowingECDirectives
DIR2009/142/EC:GAD
DIR2014/30/EC:EMC
DIR2014/35/EC:LVD
DIR2006/42/EC:MD
INSTALLATION–COMMISSIONING–SERVICING‐USER
INSTRUCTIONS
WARNING
Improper installation, adjustment, alteration, service, or maintenance can cause property
damage, injury, or death. All work must be carried out by appropriately qualified persons. The
manufacturer does not take any responsibility in the event of non-observance of the regulations
concerning the connection of the apparatus causing a dangerous operation of the apparatus, possibly
resulting in damage to the apparatus and/or environment in which the unit is installed.
Please read this document carefully before commencing installation commissioning and/or servicing.
Leave it with the user or attached to the appliance or gas service meter after installation.
Subject to modifications

1704VRC3-AMEN, p 2/35
TABLEOFCONTENTS


1.0INTRODUCTION  
1.1 BasicInformation
1.2 Warranty

2.0TECHNICALDATA
2.1 Technicaldata
2.2Burnerpressure
2.3Blowercurves
2.4Bloweroptions
2.5Dimensions

3.0GENERALREQUIREMENTS 
3.1 RelatedDocuments
3.2 HeaterLocation
3.3 CombustionAirInletPipeandFluePipe
3.4 AirSupply
3.5 AirDistributionSystem
3.6 ElectricalSupply
3.7 GasSupply

4.0INSTALLATION
4.1 UncratingandPreparation
4.2 SuspendingtheHeater
4.3 FittingtheCombustionAirInlet/FluePipe
System
4.4 GasConnection
4.5 ElectricalConnections
4.6 RoomThermostatSiting

5.0AIRDISTRIBUTION

6.0COMMISSIONINGANDTESTING
6.1 ElectricalCheck
6.2 GasConnection
6.3 SuspensionandSupport
6.4 LightingtheHeater
6.5 Heaterpipework
6.6 Adjustments
6.7 AirDistributionSystem
6.8 HeaterControls
6.9 HandingOver

7.0SERVICINGINSTRUCTIONS  

8.0REMOVALANDREPLACEMENTOFPARTS
8.1 MainBurnerRemoval
8.2 MainBurnerInjectors
8.3 IgnitionSystem
8.4 OperatingGasValve
8.5 LimitControls
8.6 CombustionAirPressureSwitch
8.7CombustionAirFan

9.0FAULTFINDING

10.0PARTSLIST 

11.0GASCONVERSION

12.0USERSINSTRUCTIONS

13.0HEALTH&SAFETYSTATEMENT



HAZARDINTENSITYLEVELS

DANGER
Failuretocomplywill resultinseverepersonalinjuryordeathand/or
propertydamage.
WARNING
Failuretocomplycould resultinseverepersonalinjuryordeathand/or
propertydamage.
CAUTION
Failuretocomplycouldresultinminorpersonalinjuryand/orproperty
damage.


WARNING: The electrical isolator should only be used in an emergency and should not be
used for closing down the main burner, as it switches off the fan prematurely and may
damage the heat exchanger, invalidating the warranty.
ATTENTION: This appliance is not intended for use by persons (including children) with reduced
sensory or mental capacities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.

1704VRC3-AMEN, p 3/35

 INTRODUCTION
1.1BasicInformation
TheinstructionsinthismanualapplytoModelVRC‐3gas‐fired/fan‐assistedwarmairheaters.These
modelshaveanaxialfanforairdelivery.Theseheatersaredesignedforoverheadsuspensionandare
suitableforindoorinstallationonlyinstalledatanoperationambienttemperaturebetween‐15°Cand
45°C.WheninstalledasatypeC12/C32andwheretheheightabovefloorlevelisgreaterthan1,8metres
measuredtotheundersideoftheappliancetheymaybeusedasagarageairheater.Thisappliancemust
beinstalledinaccordancewiththerulesinforce.
Beforeinstallation,checkthatthelocaldistributionconditions,natureofgasandpressureand
adjustmentoftheappliancearecompatible.Apermanentelectricitysupplyof230volts,50Hz,single
phaseisrequired.
Heatersareapprovedfor: TypeC12‐horizontalventforbalanced‐flueheaters;
    TypeC32‐verticalventforbalanced‐flueheaters;
    TypeB22‐verticalvent;
    CategoryII2H3+forGBandIE
Whentheexternalcontrolcallsforheat,anelectroniccontrolbeginstheignitionsequencetoprovideforasafe
start.About30secondsafterthecallforheat,thefanwillbegincirculatingwarmair.Theelectroniccontrolwill
supervisetheflameduringtheentireheatingcycletoensuresafeoperation.Whentherequiredroom
temperatureisreached,themainburnerwillshutdownleavingthefanrunningtocooldowntheheat
exchanger.Afterapproximately45seconds,thefandelayrelaywillturnoffthefan.
1.2Warranty
Warrantyisvoidif:





  TECHNICALDATA


2.1Specifications
Table1
20 30 45 60 75 100
Gas category
Comb. Air & Flue Type B (1)
Comb. Air & Flue Type C (1)
Connection colars mm 100 100 130 130 130 130
Heat inputs Hs kW 26,42 31,63 54,38 73,25 87,85 114,87
Heat inputs Hi kW 23,80 28,50 49,00 66,00 79,15 103,50
Heat output kW 21,82 25,99 44,64 60,92 73,13 94,50
Thermal efficiency % 91,70 91,20 91,10 92,30 92,39 91,30
Gas consumption G20 m3/h 2,52 3,02 5,19 6,98 8,38 11,19
Gas consumption G31 kg/h 1,86 2,22 3,82 5,15 6,17 8,24
Gas pipe connection (2) inch
ESP MIN Press Pa 50 50 50 100 150 100
ESP MAX Press Pa 200 300 200 200 350 300
Air flow measured m3/h 2248 2741 4023 5573 7079 8068
Temperature rise (3) K 28 28 32 32 30 34
Electrical service (protection IP20) 400V 3P
50Hz
Blower electrical rating W 660 1250 1410 1700 3070 3200
Total electrical rating W 770 1370 1530 1810 3180 3320
Blower Weight kg 14,5 20,5 27 26 41 45
Unit Weight kg 54 55,8 87 99 109 155
Total Weight kg 68,5 76,3 114 125 150 200
230/240V 1N 50Hz 230/240V 1N 50Hz
VRC-3 II2H3+
B22P
C12, C32, C42, C82
½" ¾"





a) VRC-3 heaters are installed in atmospheres containing flammable vapors or
atmospheres containing chlorinated or halogenated hydrocarbons or atmospheres
containing any silicone, aluminum oxide, etc., that adheres to spark ignition flame
sensing probes.
b) The installation is not in accordance with these instructions.
1
2
(1) Gas appliance Classifications for approved venting methods based on CEN report CR 1749:2001.
(2) There is a difference between the gas connection diameter and the diameter of the supply line. Always use the most adequate diameter of the supply line
to minimize the pressure drop through the gas pipes – if necessary, reduce the diameter of the supply line at the inlet of the unit.
(3)
Figure for isothermal conditions.

1704VRC3-AMEN, p 4/35
VRC 20-3 30-3 45-3 60-3 75-3 100-3
Quantity 5 6 10 8 10 12
mm 2,10 2,10 2,20 2,70 2,70 2,90
marking 210 210 220 270 270 290
Burner pressure (mbar) (1) 8,00 7,25 6,90 8,50 8,30 7,50
Injector size
VRC 20-3 30-3 45-3 60-3 75-3 100-3
Quantity 5 6 10 8 10 12
mm 1,15 1,15 1,15 1,45 1,45 1,50
marking 115 115 115 145 145 150
Butane 28,10 28,10 28,14 27,90 27,75 26,96
Propane 35,80 35,80 35,90 35,60 35,40 34,40
Injector size
Burner pressure (mbar) (1)
2.2Burnerpressure&injectorsize

Table2A:InjectorsizeandburnerpressureG20naturalgas(Inletpressure=20.0mbar)







Table2B:InjectorsizeandburnerpressureG30/G31butane/propane(InletpressuresG30=28mbar‐G31=37mbar)








1)withopenservicedoor


2.3Blowercurves
VRC 20-3

1704VRC3-AMEN, p 5/35
VRC 30-3
VRC 45-3

1704VRC3-AMEN, p 6/35
VRC 60-3
VRC 75-3

1704VRC3-AMEN, p 7/35
2.4 Blower options
2.4.1 Mixing cabinet
Bottomexit Rearexit
closed open
open closed
half half
Damperposition
VRC 100-3
VRC 20-3 with mix box

1704VRC3-AMEN, p 8/35
VRC 30-3 with mix box
VRC 45-3 with mix box

1704VRC3-AMEN, p 9/35
VRC 60-3 with mix box
VRC 75-3 with mix box

1704VRC3-AMEN, p 10/35
2.4.2 Mixing cabinet and filters
VRC 100-3 with mix box
VRC 20-3 with mix box and filters

1704VRC3-AMEN, p 11/35
VRC 30-3 with mix box and filters
VRC 45-3 with mix box and filters

1704VRC3-AMEN, p 12/35
VRC 60-3 with mix box and filters
VRC 75-3 with mix box and filters

1704VRC3-AMEN, p 13/35
2.4.3 Free blowing
Freeblowing Dimensions[mm]
LCSC Restriction
partno
A BC
20 ‐ ‐ ‐ ‐
30 1002436 58 70240
45 1002437 154154320
60 1002438 130154320
75 1002439 130154396
100 1002440 166178396
VRC 100-3 with mix box and filters

1704VRC3-AMEN, p 14/35
2.5 Dimensions
STANDARD UNIT

1704VRC3-AMEN, p 15/35
UNIT WITH MIXING CABINET (option 526)

1704VRC3-AMEN, p 16/35
  GENERALREQUIREMENTS

3.1Relateddocuments

Itisimportantthatallgasappliancesareinstalled
inaccordancewiththerulesinforceandby
appropriatelyqualifiedpersons.Failuretoinstall
appliancescorrectlycouldleadtoprosecution.Itis
inyourowninterestandthatofsafetytoensure
compliancewiththelaw.

Airheatersshouldnotbeinstalledin
corrosiveatmospheres,i.e.nearplatingor
degreasingplantsorinareaswherethere
isafirerisk.
Donotlocatetheairheaterwhereitmay
beexposedtowaterspray,rain,etc.

3.2Heaterlocation

Thelocationchosenfortheairheatermustpermittheprovisionofasatisfactoryfluesystemventingto
outdooratmosphereandadequatelyventilatedtoprovideforcombustionair.Thelocationmustalso
providesufficientspacetoallowtheheatertobeserviced.

Table3Minimuminstallationclearances(mm) Table4Recommended mountingheights(m)(*)








*Measurerearclearancefromthebackofthemotor




*Heightfromfloortobottomsurfaceofheater.Theseare
recommendationsonly.Positioningofheatersdependson
application.

Airheatersshould,whereeverpossiblealwaysbeinstalledtoblowtowardoralongexternalwall
surfaces.Wheretwoormoreairheatersareinstalledinthesameroom,ageneralschemetoensure
continuousaircirculationshouldbemaintainedforbestresults.Suspendedheatersaremosteffective
whenlocatedasclosetotheoccupancyzoneaspossible,thisfactshouldbeborninmindwhen
determiningthemountingheightstobeused.Careshouldbeexercisedtoavoiddirectingwarmair
directlyontotheoccupants.Partitions,columns,counters,storageracking,etc.shouldbetakeninto
accountwhenchoosingthelocationsothatanunobstructedpathfortheaircirculationcanbe
maintained.Whereairheatersarelocatedinthecentreofthespacetobeheated,theairshouldbe
dischargedtowardoutsidewalls.Inlargeareas,theyshouldbelocatedtodischargeairalongoutside
wallswithadditionalheatersprovidedtoblowairintothecentreofthearea.Inplaceswhereinfiltration
ofcoldisexcessive,suchasentrancedoorsitisdesirabletolocateaheatersothatwarmairis
dischargeddirectlytowardthesourceofcoldairfromadistanceof4,5‐6,0metres.

3.3Combustionairsupply&fluesystem

Theairheatermaybeinstalledasabalanced
flue(TypeC)heaterrequiringbotha
combustionairinletductandafluepipeorasa
powervented(TypeB)heater,whichrequires
onlyafluepipeexhaustingtooutdoors.All
productsofcombustionmustbefluedto
outdooratmosphere.Eachheaterinstalledasa
typeBappliancemustbefittedwithan
individualfluepipeandthecombustionairinlet
openingmustbeprovidedwithaprotection
grill(askyourdistributorfortheappropriate
protectiongrill(IP20)(dia130=PN0225094).
EachheaterinstalledasatypeCappliancemust
befittedwithanindividualcombustionair/flue
pipesystem.Onlysystemsspecifiedbytheair
heatermanufacturermaybeused.Common
flueandcombustionairsystemsmustnotbe
used!
Figure2a:Combustionairandfluepipesockets
1Flueoutletsocket
2Combustionairinletopening
3Gasconnectioninletwithsealingring
4Electricalconnections


3
VRC-3 20 3045 others
Mounting height 3 4 5
VRC-3 100
Top 150
Flue connecto
r
150
Access panel 500
Non access si
d
150
Bottom 150
Rear* 250

1704VRC3-AMEN, p 17/35
IMPORTANT:Thefluemustbeinstalledinaccordancewithnationalandlocalregulations.Failureto
provideproperflueingcouldresultindeath,seriousinjuryand/orpropertydamage.Theairheater
mustbeinstalledwithafluetotheoutsideofthebuilding.Safeoperationofanypowerventedgas
apparatusrequiresaproperlyoperatingfluesystem,correctprovisionforcombustionair,andregular
maintenanceandinspection.



3.3.1Fluesforpowerventedinstallations(TypeBappliances)

IftheairheateristobeinstalledasatypeBappliance,airforcombustionwillbetakenfromwithinthe
spacewheretheheaterisinstalled.Ensurethatanadequateairsupplyforcombustionandventilationis
providedwithinthebuildinginaccordancewiththeregulations&rulesinforce.

Table5showsfluepipesizesandmaximumpipe
lengths.Theminimumfluelengthis0.5metres.
Singlewallfluepipesarerequired.Alljoints
mustbesealedtopreventproductsof
combustionfromleakingintothebuilding.An
approvedflueterminalisrequired.

Ifthefluepassesthroughacombustible
elementofthebuildingitmustbeenclosedbya
sleeveofnon‐combustiblematerialand
separatedfromthesleevebyatleasta25mm
airbreak.

Table5:Fluepipediameters&maximumlengths
Thetemperatureofanycombustiblematerialneartothefluemustnotexceed65°Cwhentheheaterisin
operation.Thefluemustbeatleast50mmawayfromanycombustiblematerial.Singlewallfluepipe
exposedtocoldairorrunthroughunheatedareasmustbeinsulated.Wherecondensationis
unavoidable,provisionmustbemadeforthecondensationtoflowfreelytoapointtowhichitcanbe
released,i.e.adrainorgully.Thecondensationdrainfromthefluemustbeconstructedfromnon‐
corrodiblematerialnotlessthan20mmdiameter.Copperorcopperbasedalloysmustnotbeusedfor
condensationdrains.


3.3.2Combustionairinletpipe&fluepipeforbalancedflueinstallation(TypeCappliances)

Balancedflueairheatersaredesignedtobefittedwithacombustionairinletpipethatobtainsoutdoor
airandafluepipethatexhaustsflueproductstooutdoors.

Airheatersiffittedwithapowerventerpermittingeitheraverticalorhorizontalcombustionair
inlet/fluepipesystem.Theheatersmustbeinstalledwithaconcentricverticalorhorizontal
flue/combustionairinlet.Theheatersareonlyapprovedforusewheninstalledwiththeappropriate
approvedconcentricventterminal.Seetable6.

Boththeflueandcombustionairpipesmustbesealed.Usegasketsealedseamlessaluminumpipeor
equivalent.
Thefluepipemustincludeare‐sealabletestporttoallowgoodaveragesamplingofthefluegasmixture
fortesting,theportmustbeatleast450mmawayfromtheairheaterflueconnectionsocket.

Followanyfluepipemanufacturers’installationinstructionsformakingjoints,includingconnectionsto
theairheater,forpassingthroughabuildingelementandforsupportrequirements.Ifmorethanoneair
heaterisbeinginstalledinthesameplaceeachheatermusthaveaseparatefluesystem.
Wherecondensationisunavoidable,provisionmustbemadeforthecondensationtoflowfreelytoa
pointtowhichitcanbereleased,i.e.adrainorgully.Thecondensationdrainfromthefluemustbe
constructedfromnon‐corrodiblematerialnotlessthan20mmdiameter.Copperorcopperbasedalloys
mustnotbeusedforcondensationdrains.
VRC-3 other sizes
Heater socket & mm
pipe dia
Maximum straight m
length
Equivalent length m
of 45° elbow
Equivalent length m
of 90° elbow
9
0.75
1.5
20 & 30
100
130

1704VRC3-AMEN, p 18/35

Figure2b:
Combustionairandfluepipesockets,TypeC
Table6
Combustionairinlet&fluepiperequirements
1 Fluepipeoutletcollar
2Combustionairpipeinletcollar



3.4Airsupply

Itisimportanttoensurethatthereisan
adequateairsupplyatalltimesforbothcom‐
bustionandheatingrequirements.
Modernconstructionsinvolvethegreateruse
ofinsulation,improvedvaporbarriers,and
weatherproofing.Thispracticemeansthat
buildingsaresealedmuchtighterthaninthepast.

Thecombustionairsupplyforapowerventedgas
firedairheater(TypeBinstallation)canbe
affectedbylackofairsupply.Naturalinfiltration
maynotbeadequate.Useofextractfans
aggravatesthissituation.Itisimportanttoensure
thatthereisanadequateairsupplyatalltimes.
Relianceondoorsandwindowsisnotallowed.
Alwaysensurethatanadequateinletforfreshair
forcombustionisprovidedsizedtosuitthetotal
installationofanycombustionapparatus.

Fitanaccessguardtothecombustionairinleton
thebackoftheheaterandtakeappropriate
actiontoensurethatitremainsunblocked.See
figure2c.



WARNING:Thismodelairheaterisinstalled
asatypeBapplicationandisdesignedto
takeairforcombustionfromthespacein
whichitisinstalled.Donotrestrictthe
combustionairintake.
Figure2c
Combustionairandfluepipesockets,TypeB
1
2
1 Flue pipe outlet collar
2 combustion air inlet opening

3.5Airdistribution

Followrecommendedpracticeforbuildingairdistribution.Thefollowingnotesareofparticular
importance:
"Wherefreeblowingairheatersareinstalleditmustbetakenintoaccountthatheatedairisbuoyantwhenitleavesthe
appliance,therefore,airpatternswithinthespacebeingheatedwillmodifytheairthrowpatternachieved.
Inbuildinghavinglowheatlosswheresingleheatersarerequiredtocoveralargefloorareaandinbuildingswithhigh
ceilingheights,airre‐circulationfansmaybefittedtoensureevenheatdistributionandminimizestratification.Care
shouldbetakentoavoidimpedingairflowwithstorageracking,partitions,etc."

3.6Electricalsupply

Wiringexternaltotheairheatermustbecarriedoutinaccordancewiththerulesinforceandby
appropriatelyqualifiedpersons.Aconstant230Volt50Hertzsinglephasefusedelectricitysupplywith
neutrallinkisrequired.Allheatersandcontrolsmustbeearthed.Alockableisolatorwithcontact
separationofatleast3.0mmonallpolesshouldbeinstalledadjacenttotheapplianceandwithinreach
ofanypersonworkingontheheater.
1
2
VRC-3
Flue pipe
Inlet pipe
Flue pipe
Inlet pipe
Flue pipe
Inlet pipe
Flue pipe
Inlet pipe 1,5
Heater socket
& pipe dia mm
Max. straight
length m9
9
Concentricvertical ventor wall terminal : Mugro/Burfixdia 130
Concentrichorizontal ventor roofterminal :Mugro/Burfixdia 130
Equivalent length
of 45° elbow
Equivalent length
of 90° elbow
m
m1,5
0,75
0,75
20 & 30 other sizes
100
100
130
130

1704VRC3-AMEN, p 19/35
Whenanumberofheatersaretobeconnectedaspartofasingleinstallationeachheatermustbe
providedwithaseparateisolator.
Theelectricalconnectiontotheairheaterisatthebackoftheappliance.Thefinalconnectionmustbe
madeintheterminalsprovidedinthecontrolcompartment.Followthewiringdiagramprovidedwiththe
airheater.
Electricalsupplycableconductorsizeshouldbe1.5mm.Fitthecordgripsuppliedwiththeheater.The
lengthofconductorsbetweenthecordgripandtheterminalsmustbesuchthatintheeventthatthe
cablebecomestautthelineconductorsdosobeforetheearthconductor.

3.7Gassupply

VRC‐3airheatersaredesignedtooperateoneithernaturalgas(G20)orpropanegas(G31).Refertothe
specificationsinsection2ofthisdocumentandtothedataplatefordetailsofsupplypressures.Thegas
meterandgasservicemustbecheckedbythesupplyundertakingtoensurethattheyareadequateto
dealwiththetotalloadofallgasfiredapparatusinstalled.



INSTALLATION


4.1Unpackingandpreparation

Priortodispatch,theairheaterwasoperatedandtestedatthefactory.Iftheheaterhasincurredany
damageinshipment,fileareportclaimwithin2workingdaysfromreceipt.
Checktheshippinglabelanddataplatetoensurethespecificationofgasandelectricalsuppliesare
compatible.Readthisdocumentandbecomefamiliarwiththeinstallationrequirementsandthe
appliancebeforecommencinginstallation.

4.2Suspendingtheairheater

Beforeinstallingtheappliance,checktoensurethatthesupportingstructureisadequatetocarrythe
weightoftheapplianceanditsancillariesi.e.fluesystem.Pleasecheckweightsspecifiedintable1.

Whentheheaterisliftedforsuspension,support
thebottomoftheheaterwithplywoodorother
appropriatelyplacedmaterial.Ifthebottomisnot
supported,damagecouldoccur.Theheateris
suppliedwithfourpointsuspension.Allpoints
mustbeused.Twothreadednutretainersare
providedoneachsideofthetopoftheheater.See
dimensionsinsection2.2andfigure3.Besurethat
thethreadedhangerrodsarelockedtotheheateras
illustrated.Recommendedmaximumhangerrodlength
is1.8m.

IMPORTANT:
Suspendtheheaterfromthethreadednutretainers.Do
notsuspendfromtheheatercabinetpanels.Donotplace
oraddadditionalweighttothesuspendedairheater.See
hazardlevels,page2.Theheatermustbeinstalledina
levelplanetoensureproperoperation.
Figure3Suspensiondetail
Addanuttolockthe
M10x1.5hangerrod
totheheater




4.3FittingtheCombustionairinlet/Fluesystem

Fluepiperunsmaybehorizontalorverticalandterminateeitherthroughthewallorroof.Seetable5for
maximumpipelengthforanapplianceinstalledastypeBortable6formaximumlengthsandapproved
suppliedconcentricterminalsforaheaterinstalledasatypeCappliance.Allpiperunsmustbe
independentlysupportedsothattheheaterdoesnotcarryanyoftheweightofthefluesystem.
4

1704VRC3-AMEN, p 20/35

4.3.1Fittingthefluepipe
Thefluepipesocketislocatedonthebackoftheairheater.Fluepipesmust
besealed.Useseamless,aluminiumpipeorequivalent.Followpipe
manufacturer'sinstructions(seefigures4&5).
Table7Fluepipesocketsize(diamm)




4.3.2Installingaguardonthecombustionairinletpipeforpowervent(TypeBinstallations)
Thecombustionairinletsocketislocatedatthebackoftheheater.WheninstalledasatypeBappliance,
protecttheinletbyfittinganaccessguardonthesocket.Donotblockthissocketasitsuppliescombustion
airfortheburner(seefigure4).

4.3.3Fittingthecombustionairinletpipeforbalancedflue(TypeC
installations)
Thecombustionairpipeattachesdirectlytotheinletsocketatthe
backoftheheater.Airinletpipesmustbesealed.Useseamless
aluminiumorequivalent.Followthepipemanufacturer'sinstallation
instructions.Seetypicalinstallationsinfigure5.

Table8Airinletsocketsize(diamm))


Figure4

Figure5



4.4Gasconnection


Donotusetheappliancegassupplyto
balanceorsupportanypartofthe
appliance.

Figure6


Connectiontoagasnetworkmayonlybecarriedoutby
appropriatelyqualifiedpersons.Thegasinstallationmust
complywiththerulesinforceusingmaterialsappropriatefor
gasinstallation.

Tofacilitateservicing,theairheatermustbefittedwithan
approvedgasservicetapandunionfittingoruniontap
adjacenttotheappliance.
Theinletgassupplylinemustbeinstalledsoastopermitthe
accessdoortobeopenedandtoallowremovaloftheslide
outburnerassembly.
Airheaterssuspendedbyflexiblesuspensionmaterialsordrop
rodsmustbeconnectedtothegassupplyusinganapproved
flexibleconnector.Sufficientslackmustbeprovidedinthe
connectiontoallowformovementoftheappliance.Usea
flexibleconnectorofsuitablesizetoreducethepressuredrop
andthepossibilityofgasflownoise.

1Gastubeinletsealingring
2Inletgaspipe
3Unionfitting
4Gasservicetap
5Gaspipe
Sizes20/30=½”
Othersizes=¾”
20 & 30 Other sizes
100 130
VRC-3
Socket
20 & 30 Other sizes
100 130
VRC-3
Socket