Burnham FREEDOM - Wiring

54
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.