A.O. Smith VB/VW 500/750/1000 Quick Start Guide download pdf (Page 2)

• Measuretheincominggaspressure.-Minimuminletgassupplypressureof4”w.c.andmaximumis11.0fornaturalgasor

8”w.c.minand13.8maxforpropane.Themaximumvaluespeciedmustnotbeexceededunderbothloadandnoload

conditions.Ifthisconditioncannotbeobtainedapositivelock-uptypepressureregulatorMUSTbeinstalledapproximately

vefeetawayfromthegasvalveoftheboilerandpertheregulatormanufacture’sinstructions.

• Checkallgassupplylinesforleaks.

• Checkthatallventingisproperlyinstalledinaccordancewiththeventingsectionoftheinstructionmanual.

Follow the lighting and operating instructions in the Instruction Manual.

IV. Boiler Start-Up

• Starting the boiler for the rst time

-Theboileristestedatthefactoryandshouldstartproperlyifinstalledinaccordancewiththeboiler’sinstructionmanual.

- Before starting the boiler, refer to the temperature set-point procedure section in the boilers instruction manual.

 -Turnontheboiler’son/offswitch.Ensuretheoperatingsetpointissethighenoughtoactivateacallforheat.Ifanexternal

controlisusingtheboiler’sEnable/Disablecircuit,ensurethattheexternalcontrol’scontactsareclosed.Ifthereisno

externalcontrol,ensurethatthetwowiresprovidedforthiscircuitarewire-nuttedtogetherinthejunctionboxontheback

oftheboiler.Refertothewiringdiagramontheboiler.

- Allow the unit to run for at least 10 minutes before proceeding with the combustion analysis. Take a combustion sample and

record CO and CO

or O

readings.

• Setting of the test mode

-OnUIMgotomainmenu,scrolldowntousersettingsandpressselect.ScrolldowntoMODmode,pressselect.Use

theupanddownkeystoselectoptions:MIN(MINIMUMFIRINGRATE).MAX(MAXIMUMFIRINGRATE).MOD(FOR

AUTOMATICMODULATIONMODE).Pressselectforthedesiredoption.ForcheckingthecombustionsetuponMINor

MAXtheboilerwillremaininthisstatefor20minutesbeforedefaultingtotheMOD(modulation)mode.

• MAXIMUM FIRE ADJUSTMENT

- Combustion sample

 -Firstsetboilertothe“TestModeMax,”asdescribedabove,toachievemaximumringrateoftheboiler.Checkcombustion

readingsusingacombustionanalyzer.Ifcombustionreadingsarenotinaccordancewiththechartbelowadjustasfollows:remove

theat,round,blueplasticcapfromthecover.Usinga3mm(7/64”)hexwrench,turntheadjustmentscrewcounterclockwiseto

increaseorclockwisetodecreasegasowandachievethedesiredCO

level. See Table referenced below for correct settings.

TherewillbeaslighttimedelaybetweentheadjustmentandtheresponseoftheCO

measuringinstrument.Adjustthesettings

insmall1/16incrementsandallowthecombustionreadingstostabilizebeforereadjusting.Whendesiredadjustmentsare

complete, reinstall the blue plastic cap on the cover. Combustion samples shall be taken within 8 inches from the rear boiler.

IMPROPERADJUSTMENTCANCAUSEINCOMPLETECOMBUSTIONRESULTINGINDEATH.

• MINIMUM FIRE ADJUSTMENT - Combustion sample

 -Nextsetboilertothe“TestModeMin,”asdescribedabove,toachieveminimumringrateoftheboiler.Checkcombustion

readingsusingacombustionanalyzer.Ifcombustionreadingsarenotinaccordancewiththechartshownbelowadjustas

follows:removethemetalcaponthegasregulatorusingaslottedscrewdriver.Thiswillexposetheoffsetadjustmentscrew.

UsingaTORX®T40ora5mmhexwrench,carefullyadjustthelowregassettingtoachievetheCO

level prescribed

inbelowreferencetable.Note:TherotationoftheLowFireadjustmentisoppositeoftheHighFireasfollows:Clockwise

rotationincreasesgasow,counterclockwiserotationdecreasesgasow.Adjustmentstotheoffsetpressureregulators

shouldnotexceed1/16incrementsatatimebeforeallowingthereadingstorespondandstabilize.Afterproperlowre

offsetadjustmentismade,reinstalltheslottedcapontheregulator.

 Followingallgasvalveadjustments,checkforproperlight-offandverifycorrectfuel/airmixduringtestmodeprocedureprescribedabove.

 Ifadjustmentshavebeenmade,repeatthecombustionsamplingusingthe“TestMode”proceduretoinsurethatthereadingsremain

withintheranges.IfthereadingsarenotinaccordancerepeattheHighandLowreadjustmentprocedure.

IMPORTANT!! The Min Mode and Max Mode are used for checking combustion during start up. Return boiler to Mod Mode after

checking combustion.

• Combustion readings should fall within the ranges listed in the table below.

Combustion Samples Acceptable Range

% CO

, for Natural Gas @ max input 8.0% - 9.5%

% CO

, for Propane Gas @ max input 8.5% - 10.0%

CO PPM < 200 PPM

% CO

, for Natural Gas @ min input 6.5%-7.5%

% CO

, for Propane Gas @ min input 7.5%-8.5%

CO PPM < 100 PPM

1 2 3 4 5 6 7 8

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A.O. Smith VB/VW 500/750/1000 Quick Start Guide Page 2

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