ProSelect Force Steam Gas Boiler Installation Manual

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FIGURE 10: WIRING INDIRECT WATER HEATER TO BOILER
Indirect Water Heater Wiring
Figure10showseldwiringforanindirectwaterheater.AHoneywellR845AorequivalentDPSTrelayandtransformer
isrequired.ThehighlimitdescribedinPartIXmustalsobesuppliedbytheinstaller.Acallforheatfromtheindirectwater
heaterthermostatwillenergizetherelaymakingbothsetsofcontacts.Onesetofthesecontactsthenenergizesthecirculator.
Theothersetofcontactswillmakethe“T”and“T”contactsontheburnerprimarycontrol,ringtheburner.Iftheboiler
watertemperatureexceedsthehighlimitsettingof180°F,thehighlimitwillopenthe“T”-“T”circuitandtheburnerwill
shutdown.
Ifthereisacallforspaceheat,theheatingthermostatwillmakethe“T”-“T”circuitandtheboilerwillrewithoutregard
tothestatusoftheindirectwaterheater.Thelowwatercut-offandpressurelimitcontrolwillinterrupt120voltpowertothe
burnerintheeventofalowwaterorexcessivepressurecondition.
X. Electrical (continued)