Specifications

31
31
Heat Exchanger Cleaning Procedure
1) Turnoffelectricalpowerandgassupplytotheboiler.
2) Disconnectthedamperandventconnectorfromtheboiler.
3)Removetheupperfrontandtopjacketpanels.Ifpossible,removetherearandleftsidejacketpanels.
4) Removetheburners.
5) Removetheblockedvent(“spill”)switch.
6) Removethe¼-20nutsandwashersholdingtheuecollectorontotheheatexchanger.
7) Carefullyremovetheuecollectorgasketstripsandsetthemaside.
8) Removetheuecollectorfromtheheatexchanger.
9) Cleantheuepassagewaysusingastiffbristlebrush.Becertainthatallforeignmaterialisremovedfromthegaps 
 betweenthepins.
10) Cleanthebottomsurfacesoftheheatexchanger.
11) Putalightinthecombustionchamberandlookthroughtheuepassagesfromthetoptoverifythattheyhavebeen 
 thoroughlycleaned.
12) Replacetheuecollectorgasketstrips.Ifdesired,RTVsiliconesealantwitha500Fintermittentdutytemperaturemay
besubstitutedforthisropegasket.Theuecollectormustbethoroughlysealedtotheheatexchanger.
13) Replacethe¼-20nutsandwashersthatholddowntheuecollector.
14) Reattachallthejacketcomponents.
15) Reinstallburners,beingcarefultoputthepilotmainburnerinitsoriginallocation.
16) Replacetheblockedventswitch.
17)Reconnectthedamperandventsystem.
WARNING
SOOTDEPOSITSINTHEFLUEPASSAGESAREASIGNTHATTHEBOILERMAYBEOPERATING
ATHIGHCARBONMONOXIDE(CO)LEVELS.AFTERCLEANINGTHEBOILEROFSOOTDEPOSITS,
CHECKTHECOLEVELINTHEFLUEGASTOINSURETHATTHEBOILERISOPERATINGPROPERLY.
IfitisnecessarytocheckCO,useacombustionanalyzer,orotherinstrumentwhichisdesignedtomeasureCOinue
gas.ACO“sniffer”designedfortestingCOlevelsinambientaircannotbeusedtocheckboilercombustion.Takeauegas
samplebyinsertingasampleprobethroughthedraftdiverteropeningandintotheuecollectorsothatthesampleistaken
intheareadirectlyovertheheatexchanger.Donottakeasampleuntiltheboilerhasbeenringforatleastveminutes.
AnormalCOreadingforaCWIseriesboilerislessthan50ppm(0.005%).Areadingofmorethan100ppm(0.01%)is
indicativeofacombustionproblem.
SomecausesofexcessiveCOinclude:
• Incorrectlysizedmainburneroriceforthealtitudeatwhichboilerisinstalled
• Crookedorout-of-roundoriceholes(neverattempttodrilloriceforthisboilerintheeld)
• Partiallypluggeduepassages
• Impropermanifoldpressure
• Foreignmaterialinburnerventurisorburnerports
• Leakinsealbetweenuecollectorandheatexchanger
 • Inadequatesupplyofcombustionair