State Industries SW 37-670 instruction manual Wiring Diagrams

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DIAGRAM 2.

THREE PHASE WYE WITH THERMOSTAT

DIAGRAM 1.

THREE PHASE DELTA WITH THERMOSTAT

WIRING DIAGRAMS

NOTE(S):

1.IF A MANUAL RESET HLMT IS USED, THE SECOND AUTO RESET HLMT SWITCH IS NOT USED.

STD. WIRING

OPTIONAL OR FIELD WIRING AS REQ’D

NOTE(S):

1.IF A MANUAL RESET HLMT IS USED, THE SECOND AUTO RESET HLMT SWITCH IS NOT USED.

STD. WIRING

OPTIONAL OR FIELD WIRING AS REQ’D

CONTACTOR COIL

INDICATION LIGHT

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Contents Commercial Electric Boilers Installation Operation Service Maintenance Limited WarrantySafe INSTALLATION, USE and Service Precautions Hydrogen GAS Flammable General Safety InformationGrounding Instructions Introduction Table of ContentsSizes and Data NW37 Thru NW150 Dimension DataSizes and Data NW220 Thru Boiler Specifications Standard Dimension Data cont’dActual Configuration MAY Vary Features and ComponentsModel and Rating Locating the Boiler ApprovalsFacts to Consider About the Location Required Ability InstallationGeneral Pressure Relief ValveThermal Expansion Closed Water SystemsBranch Circuit Electrical DataCalculating Amperage Overcurrent Protection Boiler CircuitsWiring Diagrams Diagram Three Phase WYE with Step Control Diagram Three Phase Delta with Step ControlTemperature Regulation High Temperature LimitsOperation Filling the BoilerDraining Temperature ControlsFlushing MaintenanceSediment Removal Water and Lime Scale RemovalSystem Water Test Troubleshooting ChecklistSW-37 Thru SW-670 Electric HOT Water Boiler Limited Warranty Division of A. O. Smith Corporation RENTON, Washington