Specifications
61
10) Checktheinletpressureandadjustifnecessary.Verifythattheinletpressureisbetweentheupperandlowerlimitsshown
ontheratingplatewithallgasappliancesonandoff.
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) Starttheboilerusingthelightinginstructionsonpage49.Aftertheboilerispoweredup,itshouldgothroughthefollowing
sequence.
Sequence Display Meaning
1 U.125 orBlank Checkinginternalsoftware(power-uponly)
2 0.SWT Boilerinstandby.SWT =SupplyWaterTemp.Nocallforheat.
(Aftercallforheatfromheatingthermostat)
3 A.SWT Self-CheckonStart-up
4 5.SWT Blowerandcirculatoron.Checkingforadequateairow.
5 1.SWT Prepurge
6 2.SWT Trialforignition
7 3.SWT Flameestablished.Boilerrespondingtoacallforheat.
8) Uponinitialstart-up,thegastrainwillbelledwithair.Evenifthegaslinehasbeencompletelypurgedofair,itmaytake
severaltriesforignitionbeforeaameisestablished.Ifmorethan5triesforignitionareneeded,itwillbenecessaryto
presstheresetbuttontorestarttheboiler.Onceaamehasbeenestablishedforthersttime,subsequentcallsforburner
operationshouldresultinaameonthersttry.
9) Inspecttheamevisiblethroughthewindow.Onhighretheameshouldbestableandmostlyblue(Figure11.1).No
yellowtippingshouldbepresent;however,intermittentecksofyellowandorangeintheamearenormal.
Figure 11.1: Burner Flame