Install Instructions

1) LineVoltage(120VAC)Connections(Figure10.1)–Thelinevoltageconnectionsarelocatedinthejunctionboxonthe

rightsideofthevestibule:

• Black–Linevoltage“hot”

• White–“Neutral”forboilerandcirculators

• Red–“Heating”circulator“hot”

• Blue–“IndirectWaterHeater“circulator“hot”

• Green–Groundconnection

2) Maximumcirculatorcontinuouscurrentdrawis2A.WhenPipingMethod#1isused,itmaybedesirabletousethe

boilertodirectlycontroltheprimarycirculatorinadditiontothesecondarycirculator.Ifthisisdone,controlboth

heatingcirculatorsusingarelaywitha120VACcoil,suchasaHoneywellR4222,asshowninFigure10.3.Selecta

relaywithacontactratinginexcessofthecombineddrawofthetwocirculators.

3) LowVoltageConnections(Figure10.1)–Theseconnectionsarescrewterminalslocatedontheterminalstripnextto

thejunctionboxontheleft:

• Terminals1and2–“Heating”thermostatconnections

• Terminals3and4–“ExternalLimitControl”connections

• Terminals5and6–“OutdoorResetSensor”connections

• Terminals7and8–“DomesticIndirectWaterHeater”thermostatconnections

• Terminal9–“FlameSignalReading”

• Heatanticipatorsettingforthethermostatconnectionis0.1Awhenthermostatisconnecteddirectlytoterminals1

and2.

WARNING

All wiring and grounding must be done in accordance with the authority having

jurisdiction or, in the absence of such requirements, with the National Electrical

Code (ANSI/NFPA 70).

X Wiring

CAUTION

WHEN MAKING LOW VOLTAGE CONNECTIONS, MAKE SURE THAT NO

EXTERNAL POWER SOURCE IS PRESENT IN THE THERMOSTAT OR

LIMIT CIRCUITS. IF SUCH A POWER SOURCE IS PRESENT, IT COULD

DESTROY THE BOILER’S MICROPROCESSOR CONTROL (MCBA).

ONE EXAMPLE OF AN EXTERNAL POWER SOURCE THAT COULD BE

INADVERTENTLY CONNECTED TO THE LOW VOLTAGE CONNECTIONS

IS A TRANSFORMER IN OLD THERMOSTAT WIRING.

4) Iftheoutdoorsensorisconnectedtoterminals5and6,theboilerwilladjustthetargetspaceheatingsetpointsupplywater

temperaturedownwardsastheoutdoorairtemperatureincreases.Ifused,thissensorshouldbelocatedontheoutsideofthe

structureinanareawhereitwillsensetheaverageairtemperaturearoundthehouse.Avoidplacingthissensorinareaswhere

itmaybecoveredwithiceorsnow.Ingeneral,locationswherethesensorwillpickupdirectradiationfromthesunshould

alsobeavoided.Avoidplacingthesensornearpotentialsourcesofelectricalnoisesuchastransformers,powerlines,and

uorescentlighting.Wirethesensortotheboilerusing22gaugeorlargerwire.Aswiththesensor,thesensorwiringshould

beroutedawayfromsourcesofelectricalnoise.Whereitisimpossibletoavoidsuchnoisesources,wirethesensorusinga

2conductor,ULTypeCM,AWMStyle2092,300Volt60°Cshieldedcable.Connectoneendoftheshieldingonthiscableto

ground.