ProSelect Force Steam Gas Boiler Installation Manual

14
106324-04 - 4/18
AllFORCESTMseriesboilersareequippedwithtappingstopermittheconnectionofaLinkSL™IndirectWater
Heater,orotherindirectwaterheater.Inthistypeofsystem,hotboilerwaterisdrawnfrombelowthewaterlineand
passedthroughtheheatexchangerintheindirectwaterheater.Thissectiondescribesboiler-sidepipingonly.RefertoLink
SL™Installation,OperatingandServiceInstructionsforadditionalinformation
.Thecomponentsinthissystemandtheir
functionsareasfollows:
1) Circulator-MountthecirculatorasshowninFigure9.Thecirculatorshouldbelocatedaslowandasclosetothe
boileraspractical.Donotinstallvalves,orotherdeviceshavingasignicantpressuredrop,betweentheboiler
andthecirculatorinlet.Allpipingbetweentheboilerandthecirculatorinletshouldbe1”,regardlessofthesizeof
thepipingrequiredintherestofthesystem.SeeFigure10inPartXforwiringinformation.
2) “Y”Strainer-Installa“Y”strainertopreventsedimentfromaccumulatinginsidetheindirectwaterheater.
3) CheckValve-Preventsgravitycirculationthroughtheindirectwaterheaterwhentheboilerisrespondingtoacall
forheat.
4) BoilerLimitControl-UseaSPSTbreak-on-risetemperaturelimitcontrolsuchastheHoneywellL4006A.Donot
setthelimitabove180°Fasdoingsomaycausetheboilertosteamwhenthereisnocallforheat.SeeFigure10
forwiringinformation.
5) ValvesandUnions-Installshut-offvalves,drainvalves,andunionsinlocationsthatwillfacilitatemaintenanceof
thesystem.Donotinstallanyvalvesbetweentheboilerandcirculatorinlet.
IMPORTANT
Someindirectwaterheatersmaynotbesuitableforusewithasteamboiler.Consultthewaterheater
manufacturersguidelinesbeforeinstallingitinthistypeofsystem.
• Boilerwatertemperaturesandowratesinthistypeofsystemmaybeconsiderablylowerthanthoseupon
whichthewaterheatermanufacturersratingsarebased.Thismayresultinsubstantiallylongerwaterheater
recoverytimes.
FIGURE 9: INDIRECT WATER HEATER BOILER-SIDE PIPING
IX. Indirect Water Heater Piping