Specifications

22
B. Removing an Existing Boiler From a Common Chimney
ReadthisonlyiftheFCMboilerisreplacinganexistingboilerthatisbeingremovedfromacommonchimney. 
ThissectiondoesnotapplytotheinstallationofaFCMboiler.
  Insomecases,whenanexistingboilerisremovedfromacommonchimney,thecommonventingsystemmaybe
toolargefortheremainingappliances.Atthetimeofremovalofanexistingboiler,thefollowingstepsshallbefollowed
witheachapplianceremainingconnectedtothecommonventingsystemplacedinoperation,whiletheotherappliances
remainingconnectedtothecommonventingsystemarenotinoperation.
(a)Sealanyunusedopeningsinthecommonventingsystem.
(b)Visuallyinspecttheventingsystemforpropersizeandhorizontalpitchanddeterminethereisnoblockage  
orrestriction,leakage,corrosionandotherdeciencieswhichcouldcauseanunsafecondition.
(c)Insofaraspractical,closeallbuildingdoorsandwindowsandalldoorsbetweenthespaceinwhichallthe  
appliancesremainingconnectedtothecommonventingsystemarelocatedandotherspacesofthebuilding.Turn
onclothesdryersandanyappliancenotconnectedtothecommonventingsystem.Turnonanyexhaustfans,suchas
rangehoodsandbathroomexhausts,sotheywilloperateatmaximumspeed.Donotoperateasummerexhaustfan.
Closereplacedampers.
(d)Placeinoperationtheappliancebeinginspected.Followthelightinginstructions.Adjustthermostatsotheappliance
willoperatecontinuously.
(e)Testforspillageatthedrafthoodreliefopeningafter5minutesofmainburneroperation.Usetheameofamatchor
candle,orsmokefromacigarette,cigar,orpipe.
(f)Afterithasbeendeterminedthateachapplianceremainingconnectedtothecommonventingsystemproperlyvents
whentestedasoutlinedabove,returndoors,windows,exhaustfans,replacedampersandanyothergas-burning
appliancestotheirpreviousconditionofuse.
(g)Anyimproperoperationofthecommonventingsystemshouldbecorrectedsotheinstallationconformswiththe
NationalFuelGasCode,ANSIZ223.1.Whenre-sizinganyportionofthecommonventingsystem,thecommon
ventingsystemshouldbere-sizedtoapproachtheminimumsizeasdeterminedusingtheappropriatetablesinPart11
oftheNationalFuelGasCode,ANSIZ223.1.
WARNING
NEVER COMMON VENT A FCM BOILER WITH OTHER APPLIANCES.