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10) Checktheinletpressureandadjustifnecessary.Verifythattheinletpressureisbetweentheupperandlowerlimitsshown
ontheratingplatewithallgasappliancesonandoff.
WARNING
THE OUTLET PRESSURE FOR THE GAS VALVE HAS BEEN FACTORY SET
AND REQUIRES NO FIELD ADJUSTMENT. THIS SETTING IS SATISFACTORY
FOR BOTH NATURAL GAS AND PROPANE. ATTEMPTING TO ADJUST THE
OUTLET PRESSURE MAY RESULT IN DAMAGE TO THE GAS VALVE AND
CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
7) Starttheboilerusingthelightinginstructionsonpage49.Aftertheboilerispoweredup,itshouldgothroughthefollowing
sequence.
Sequence Display Meaning
1 U.125 orBlank  Checkinginternalsoftware(power-uponly)
2 0.SWT  Boilerinstandby.SWT =SupplyWaterTemp.Nocallforheat.
  (Aftercallforheatfromheatingthermostat)
3 A.SWT Self-CheckonStart-up
  4   5.SWT Blowerandcirculatoron.Checkingforadequateairow.
5 1.SWT  Prepurge
6 2.SWT  Trialforignition
7 3.SWT   Flameestablished.Boilerrespondingtoacallforheat.
8) Uponinitialstart-up,thegastrainwillbelledwithair.Evenifthegaslinehasbeencompletelypurgedofair,itmaytake
severaltriesforignitionbeforeaameisestablished.Ifmorethan5triesforignitionareneeded,itwillbenecessaryto
presstheresetbuttontorestarttheboiler.Onceaamehasbeenestablishedforthersttime,subsequentcallsforburner
operationshouldresultinaameonthersttry.
9) Inspecttheamevisiblethroughthewindow.Onhighretheameshouldbestableandmostlyblue(Figure11.1).No
yellowtippingshouldbepresent;however,intermittentecksofyellowandorangeintheamearenormal.
Figure 11.1: Burner Flame