IBC SL 40-399 G3 - Combustion testing and adjustment

Combustion testing and adjustment
Danger
Acombustiontestchecksthatthegasvalveisoperatingproperlyinthefield.Toperformacombustiontest,you
mustbeaqualified,trainedandlicensedgasfitter.
MakingadjustmentstotheIBCgasvalvewithoutaproperlycalibratedgascombustionanalyzerandbypeople
whoarenottrainedandexperiencedinitsuseisforbidden.Failuretouseananalyzercanresultinan
immediatehazard.
Model Number High Fire Input
SL40-399G3 399MBH
Table 2 Rated input of a converted boiler
Normalignitionsystemsequenceofoperation:
Theboilercontrol,uponacallforheatorDHW,turnsonthecombustionfanfora20-secondpre-purge,thenenergizesthe
sparkelectrodeandgasvalvefora4-secondtrialforignition.
Iftheburnerdoesnotlight,theprocessisrepeateduntiltheburnerlightsandflameisdetected.After3trialsforignition,the
boilerlocksoutandwillneedtobemanuallyresetbyclearingtheerroronthetouchscreencontroller(Diagnostics>
AdvancedDiagnostics>ClearErrors).Theboilerautomaticallyresetsafter60minutes,ifnoactionistaken.
To perform a combustion test and adjustment:
1. Turnofftheboiler’sgasshut-offvalve.
2. Withasmall(1/8"or3mm)flatscrewdriver,opentheinletgassupplypressuretestportbyturningitscenter-screw1
fullturncounterclockwise.
3. Attachamanometertotheinletpressuretestportandturnongastoappliance.
Staticmanometerreadingshouldbeideally7"w.c.forNaturalGasand11"w.c.forPropane.
Minimumandmaximumstaticpressureshouldbebetween5"and14"w.c.Monitorpressurethroughoutthe
commissioning(start-up)procedure.Pressuremaydropupto1"to2"w.c.athighfire.
4. Beforeyouchangetheloadtomanualcontrol,notetheloadsetting.
5. Settheloadtomanualcontrol,andsettheheat-outvaluetothemaximumMBHfortheboiler.Thisloadshouldbe
largeenoughtoallowtheboilertooperateathighfireforover10minutes.
6. Withacombustionanalyzerprobeinthefluegastestport,checkthefluegasreadingandadjustthegas:airratio
screwtobringthefluegastowithintheparametersindicatedinTable 1 .
7. Adjustslowly(clockwise)theHighFire(Gas:AirRatioAdjustment)screwtoobtainthecorrectCO
2
value(see
Table 1 ).
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