State Industries SW 37-670 Division of A. O. Smith Corporation RENTON, Washington

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A DIVISION OF A. O. SMITH CORPORATION

RENTON, WASHINGTON

Technical Support: 800 527-1953

Parts Department: 800 433-2515

www.statewaterheaters.com

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Contents Installation Operation Service Maintenance Limited Warranty Commercial Electric BoilersSafe INSTALLATION, USE and Service Grounding Instructions General Safety InformationPrecautions Hydrogen GAS Flammable Table of Contents IntroductionDimension Data Sizes and Data NW37 Thru NW150Sizes and Data NW220 Thru Dimension Data cont’d Boiler Specifications StandardFeatures and Components Actual Configuration MAY VaryFacts to Consider About the Location ApprovalsModel and Rating Locating the Boiler Installation Required AbilityGeneral Pressure Relief ValveClosed Water Systems Thermal ExpansionElectrical Data Branch CircuitCalculating Amperage Overcurrent Protection Boiler CircuitsWiring Diagrams Diagram Three Phase Delta with Step Control Diagram Three Phase WYE with Step ControlHigh Temperature Limits Temperature RegulationOperation Filling the BoilerTemperature Controls DrainingMaintenance FlushingSediment Removal Water and Lime Scale RemovalTroubleshooting Checklist System Water TestSW-37 Thru SW-670 Electric HOT Water Boiler Limited Warranty Division of A. O. Smith Corporation RENTON, Washington