Crown Bermuda Installation Manual

IX Indirect Water Heater Piping

AllBSIseriesboilersareequippedwithtappingstopermittheconnectionofaCrownMega-Stor,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theindirectwaterheaterinstructionmanual

fordomesticwaterpiping.Thecomponentsinthissystemandtheirfunctionsareasfollows:

1)Circulator-MountthecirculatorasshowninFigure13.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15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180Fasdoingsomaycausetheboilertosteamwhenthereisnocallforheat.SeeFigure15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 

manufacturer’s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manufacturer’sratingsarebased.Thismayresultinsubstantiallylongerwaterheaterrecoverytimes.

FIGURE13:INDIRECTWATERHEATERBOILER-SIDEPIPING