Siemens LMV51.140C1 - Page 188

TechnicalInstructions  LMVSeries
DocumentNo.LV5‐1000
Section6 Page16SCCInc.

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11. TheAZL52willthenprompt"whenvaluestable,continuewithENTER”.Aftertheburnerisat
Point2,waitatleastanadditional30secondstomakesurethattheO
2
valuebeingreadis
representativeofPoint2,thenpressEnter.PressingEnterstorestheO
2
RatioControlCurve
point.Thevaluethatisstoredshouldbeclose(+/‐0.2%)tothe"saved"valuethatwasrecorded
forPoint2duringRatioControlCurvecommissioning.

NOTE:Itisimportanttowaitlongenoughtogetasteady‐stateO
2
valuebeforeEnteris
pressed.Ifindoubt,waitlongerforthevaluetostabilize.Waitinglongerthannecessaryhas
noilleffectsfortheO
2
trimcommissioning.

NOTE:IftheO
2
valuedisplayedontheAZL52isnotsteady(oscillatingmorethan+/‐0.1%O
2
),
itislikelythattheO
2
sensorisnotmountedcorrectly,orthereareotherissueswiththe
burner/boilerthatareaffectingthefuel/airratio.Theseissuesmustbecorrectedbefore
proceeding.

12. Next,slowlyincreasetheStandardValnumber,whichreducestheairflowintotheburner.The
readingbesideO2ControlshouldstarttodropasStandardValisincreased.NotethattheTa
u
timeoftheboilercomesintoplayhere,soitmaytake10‐15secondsormoreforachangein
theStandardValnumbertobeseenintheO
2
reading.

13. OncetheStandardValnumberhasbeenincreasedenoughtogetthe%O
2
atleast0.5%below
theO
2
RatioControlCurve,thepointcanbestored.ThisisdonebypressingEnter,Escape,and
thenEnteragain.

NOTE:IftheRatioControlCurvepointwassaved0.5%O
2
abovethetarget%O
2
(seestep3
above),thenloweringthe%O
2
by0.5%usingtheStandardV alshouldputtheO
2
ControlCurve
pointonorveryclosetothetarget%O
2
.
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14. Afterthepointisstored,thedelaytimeatPoint2(TauLow‐Fire)willbemeasured.Thisshould
occurandtheAZL52shouldstate"MeasurementSuccessful,ControlParametersStored".

15. TherestofthePoints(3thru10)cannowbedoneinasimilarmanner.Thedelaytime(Tau
High‐Fire)willalsobemeasuredatth
ehighfirepoint,inthis casePoint10.
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16. AfterthedelaytimeissuccessfullymeasuredatPoint10,escapeoutoftheO
2
controlcurve.See
Figures6‐6and6‐7belowforanexampleofwhattypicalO
2
trimcurvesandLambdaFactor
curvesmightlooklikeforthisapplication.

17. IftheburnermustalwaysberunwitheithertemperaturecompensationorO
2
trim(mostultra‐
lowNOxmeshburners):

a. LimitthelowfiretotheloadnumberatPoint2.Thiscanbedonebysettingparameter
MinLoadGastotheloadnumberofPoint2usingthefollowingmenupath:

Params&Display>RatioControl>GasSettings>LoadLimits>MinLoadGas

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