ProSelect Force Steam Gas Boiler Installation Manual

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CAUTION
• INSTALLBOILERSOTHATTHEGASIGNITIONSYSTEMCOMPONENTSAREPROTECTED
 FROMWATER(DRIPPING,SPRAYING,RAIN,ETC.)DURINGAPPLIANCEOPERATIONANDSERVICE
 (CIRCULATORREPLACEMENT,ETC.).
• OPERATIONOFTHISBOILERINASYSTEMHAVINGSIGNIFICANTAMOUNTSOFDISSOLVED
 OXYGENCANCAUSESEVEREHEATEXCHANGERCORROSIONDAMAGE.
VIII. System Piping
General Piping Notes
Figure7showsrecommendednearboilerpipingformostcommontypesofgravityreturnsteamsystems.Additional
informationonsteamsystemdesignmaybefoundinInstallation Guide for Residential Hydronic Heating Systems(Pub.
#200).
Oneoftheprimarypurposesofthisnearboilerpipingistoseparatetinywaterdropletsfromthesteamexitingtheboiler
sothat“dry”steamissenttothesystem.Ifthenearboilerpipingisnotcorrect,wetsteamwillenterthesystemandthe
followingproblemsmayoccur:
• Short cycling on low water
• BoilerorsystemFlooding
• Hammering
• Failuretoheatoneormoreradiators
AvoidthethreecommonpipingmistakesshowninFigure8.Thisapplieseveniftheexistingboilerhasoneofthepiping
mistakesshowninFigure8andappearstobeworking.Iftwoormoresteammainsmustbeconnectedtotheboiler,connecta
separatetake-offforeachmainintotheheaderbetweentheriser(s)andequalizer.Alsonotethefollowingpoints:
1) Asizereductionmustbemadetoconnecttheheadertotheequalizer.Thisreductionmustbemadeintheequalizerline.
Donotmakethissizereductioninthehorizontalheader.
2) Onepipesteamsystemsrequireairventsoneachradiator,aswellasattheendofeachmain.Forthesystemtowork
properly,theseventsmustbeproperlyinstalled,sized,andbeingoodcondition.Inspectandreplaceanydefectivevents.
Iftherearenoventsattheendsofthemains,installthem.
3) DonotattempttomanifoldmultipleFORCESTMboilerswithgravityreturns.
4) Forinstallationswithcondensateorboilerfeedpumps,followthepumpmanufacturer’spipinginstructions.Such
systemsgenerallydonotrequireHartfordloops.
5) Donotuseacheckvalveinplaceof,orinadditionto,aHartfordlooponagravityreturnsystem.
6) Pipethellconnectionfromacleansourceofcoldwater.Whenthewatersupplyisfromawell,makesurethatastrainer
isinstalledinthewellsystem.
7) PipingwithaChiller-Iftheboilerisusedinconjunctionwithachiller,pipetheboilerinparallelwithchiller.Use
isolationvalvestopreventchilledwaterfromenteringtheboiler.