Siemens LMV51.140C1 - Pre-Requisites for LMV52 Systems with O 2 Trim

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page5 Section4
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6. LMV52/VFDcombinationmustbe“Standardized”beforeoperation.SeeSection5(VSD)for
moredetails.
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a. Verifythattheairdamperopenstopre‐purgepositionbeforetheblowerisenergized
forstandardization.
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Pre‐RequisitesforLMV52SystemswithO2Trim
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1. AllprerequisitesoftheBasicLMV51systemapply.
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2. TheO
2
sensormustbemountedcorrectly. SeeAppendixB(LMV5AccessoriesGuide)formore
details.Particularattentionshouldbepaidtothefollowing:
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a. IftheO
2
sensorcannotbeinstalledperAppendixB(LMV5AccessoriesGuide),contact
SCCforassistance.
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b. TheQGO20O
2
sensorisnotsuitedformosttypesofbiogasorfuelsthatproduceash,
suchas#6oil.ContactSCCforadviceonthecompatibilityofuncommonfuels.
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3. TheO
2
sensormustbewiredtothePLL52correctly.SeeSection2(Wiring)formoredetails.
Particularattentionshouldbepaidtothefollowing:
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a. ThePLL52modulemustbewithin30feetoftheO
2
sensor.
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b. TwoconduitsmustberunbetweentheQGO20O
2
sensorandthePLL52module.One
conduitmustcontainthelowvoltagesignalswhiletheotherconduitmustcontainthe
highvoltageforthesensorheater.
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4. Thefurnacepressureoftheboilerbeingcommissionedmustberepeatable atagivenfiringrate.
Repeatabilityof+/‐0.2inWCateachfiringrateisadequate.
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5. Afuelflowmeterorsomemeansofdeterminingtheload(firingrate)to+/‐3%isrequired.A
moreaccurateloadnumb
er(+/‐3%)foreachcurvepointisnecessaryforreliableO
2
trim
functionality.
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6. TheLMV52mustbepoweredandconfiguredfortheQGO20O
2
sensorfortwohourspriorto
commissioning.ThisisdonetolettheQGO20sensorheatupthoroughly.
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7. Theboilermustbeuptonormaloperatingtemperature/pressureforatleastonehourbefore
commissioningtheO
2
trim.
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