A.O. Smith 110 - PURGE THE GAS LINE OF AIR; CHECKING MANIFOLD GAS PRESSURE

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TroubleshootingGuide

22|Page

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5) Slowlyre‐openthemanualgasvalve.Checktoseethattherearenogasleaks.

6) Opensomeofthefixturesthatusethehighestflowratetoactivate.

7) Checktheinletgaspressure.Appropriatepressuresarelistedinthespecificationpageat

thefrontofthismanual.

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PURGETHEGA SLINEOFAIR:

1) Theunitshouldnotberunningduringthisprocedure.Turnoffpowertotheunit.

2) Turnthegasvalvetotheoffposition(perpendiculartothegasline).

3) Loosenthegaslineontheunitsideofthegasvalve(ataflarefittingorunion).

4) Next

openthegasvalveveryslightlyuntilyoucansmellgasbywaftingtheairtowardsyour

nose.Thismeansanyairpreviouslyinthegaslinehasbeenremovedandonlygasremains.

5) Turngasbackoffandre‐tightengasline.

6) Turngasbackonand

checkforleaks.Spraywater&dishsoapmixtureontofittings.No

bubblesmeanstherearenoleaks.

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CHECKINGMANIFOLDGASPRESSURE:

1) Ensuretheunitisnotinoperation.

2) Removethescrewoffthemanifoldport.

3) Connectamanometertothemanifoldportusing

atube(Figure1).Ensurethatthisconnectionis

secureenoughtopreventgasleak.

4) Runwaterthroughtheunittoactivateits

operation.It

issuggestedthatalargeamountof

flowisdrawninordertopreventoverheating

duringmaxburn.Ifpresenceofagasleakis

detected,immediatelyshutofftheunitand

inspectthetube/manifoldconnection;otherwise,

proceedontothenextstep.

5) Tocheckthemanifoldgaspressureduring

maximumcombustion,pressandholdthe“MAX”

buttononthecomputerboard.Tocheckthemanifoldpressureduringminimum

combustion,pressandholdthe“MIN”buttononthecomputerboard.Thedesired

pressuresarelistedinthespecificationtableatthebeginningofthismanual.

6) Ifthemanifold

pressuresdonotmatchupwiththoselisted, adjustthemanifoldpressure

(seethefollowingprocedure).

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Figure19

A.O. Smith 110 - PURGE THE GAS LINE OF AIR; CHECKING MANIFOLD GAS PRESSURE

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