EngA DJM3

A DJM3
IOM-17 20 of 27 Mar 99 R3
PilotSetUp(StandardBurners)
Donotsetuppilotuntilyouareconfidenttheburnerisoperatingwithcorrectair/fuelmixture.
Ensurethepilottubeisfree ofdebrisandblockages.Onstandard roundburners,setpilotas
perthefollowingprocedure.
1. Installa10,000‐ohmresistorinserieswiththeflame
rodcircuit.
2. ConnectaDCvoltmeteracrosstheresistor.
3. Thereadingwillbeinmillivoltsifyourmeterdoes
notautoscale.
4. Connectamanometertothepilotline.
5. Runtheburneronmainflameforafewminutesto
havetheburnerplatewarm.
6. Leavethepilotonbutturnthemaingasoff.Youwill
havetojumpertheDJM3terminalsPV1andPV2to
dothisandremovethewirefromterminalVFB120orVFB24(dependingonvalvevoltage).
7. Aslowpilotgaspressurecandamagetheceramics,reducethepilotgaspressureto2.5
inchesandimmediatelyreturnittoahigherpressure.Thisistoensurethepilotgasregular
respondsproperly.
8. Adjustthepilotvalveregulatortoapressureinexcessof4.5inchespressure.
9. Slowlyreducethepilotgaspressurewhilewatchingboththepressureandthevoltmeter.
Themillivoltreadingshouldbeincreasing.Atthepointwhereitbeginstofallyoushould
stopreducingpressureandreturntothehighspot.
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NOTE: Thefallinpressurecouldonlybeassmallasacoupleofmillivolts.Thispointshouldbe
between4.5and2.5inchespilotpressure.
NOTE: Somesmallerburners(DJ40250,000BTUHandsmaller),mayneedtohaveascrewplaced
throughthepilotairtubetoreducetheamountofairtothepilot.
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10. Thisreadingisusedtodeterminetheadjustmentthatwillusuallygivethebestpilotlighting
andprovingstrength.However,caremustbetakentonotadjustthereadingforpilotgas
pressurebelow2.5incheswatercolumnpressureoryouwillbreakthepilotceramics.
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11. Next,visuallyobservethepilotflame.Itshouldbevisibleataminimumof3oftheholes
aroundthepilot.Ifthepilotcannotbeseenthenitislikelyburningtoodeepintothepilot
box.Ifthisisoccurringcheckthatthegasketonthepilotassemblyisformingatightseal.
Alsoensurethattheburnerislocatedinthecenteroftheburnertube.Ifitismountedtoo
lowthentoomuchaircanflowoverthetopoftheburnerandaffectthepilot.
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NOTE:Aftersetupiscompletemakesuretoturnoffdipswitch5.
Ignition
Control
10,000ohms
MVmeter
OK
Toolargeagap.Raise
burnerplateupto
centre
.