State Industries SW 37-670 manual

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

Contents

Installation Operation Service Maintenance Limited Warranty Commercial Electric Boilers Safe INSTALLATION, USE and Service Grounding Instructions General Safety InformationPrecautions Hydrogen GAS Flammable Table of Contents Introduction Dimension Data Sizes and Data NW37 Thru NW150 Sizes and Data NW220 Thru Dimension Data cont’d Boiler Specifications Standard Features and Components Actual Configuration MAY Vary Facts to Consider About the Location ApprovalsModel and Rating Locating the Boiler Installation Required AbilityGeneral Pressure Relief Valve Closed Water Systems Thermal Expansion Electrical Data Branch CircuitCalculating Amperage Overcurrent Protection Boiler Circuits Wiring Diagrams Diagram Three Phase Delta with Step Control Diagram Three Phase WYE with Step Control High Temperature Limits Temperature RegulationOperation Filling the Boiler Temperature Controls Draining Maintenance FlushingSediment Removal Water and Lime Scale Removal Troubleshooting Checklist System Water Test SW-37 Thru SW-670 Electric HOT Water Boiler Limited Warranty Division of A. O. Smith Corporation RENTON, Washington