State Industries SW 37-670 Wiring Diagrams, Std. Wiring Optional Or Field Wiring As Req’D

Models: SW 37-670

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DIAGRAM 2.

THREE PHASE WYE WITH THERMOSTAT

DIAGRAM 1.

THREE PHASE DELTA WITH THERMOSTAT

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

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

INDICATION LIGHT

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Contents

ASME A DIVISION OF A. O. SMITH CORPORATIONCOMMERCIAL ELECTRIC BOILERS MODELS SWDANGER SAFE INSTALLATION, USE AND SERVICEPRECAUTIONS GENERAL SAFETY INFORMATIONHYDROGEN GAS FLAMMABLE GROUNDING INSTRUCTIONSPreparing for the Installation TABLE OF CONTENTSINTRODUCTION SIZES 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 ASMERequired Ability INSTALLATIONGeneral Pressure Relief ValveTHERMAL EXPANSION CLOSED WATER SYSTEMSBranch Circuit ELECTRICAL DATACalculating Amperage Overcurrent Protection Boiler CircuitsSTD. WIRING OPTIONAL OR FIELD WIRING AS REQ’D WIRING DIAGRAMSSTD. WIRING OPTIONAL OR FIELD WIRING AS REQ’D CONTACTOR COIL INDICATION LIGHTDIAGRAM THREE PHASE WYE WITH STEP CONTROL DIAGRAM THREE PHASE DELTA WITH STEP CONTROLFilling the Boiler OPERATIONINITIAL START UP HIGH TEMPERATURE LIMITSDRAINING Temperature ControlsWater Temperature Time to Produce 2nd & 3rdSystem Cleaning MAINTENANCEPressure Relief Valve Test FLUSHINGSYSTEM WATER TEST TROUBLESHOOTING CHECKLISTNot enough or no hot water Water is too hot1.THE TANK A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON Technical Support