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Hubbell STH manual DOUBLE SAFETY SOLENOID SYSTEM if installed

Models: STH ST

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DOUBLE SAFETY SOLENOID SYSTEM (if installed)

DOUBLE SAFETY SOLENOID SYSTEM (if installed)

24

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Hubbell STH manual DOUBLE SAFETY SOLENOID SYSTEM if installed

Contents

BASE MODEL “ ST and STH ” OPERATING AND MAINTENANCE MANUAL FORSTEAM FIRED WATER HEATER ELECTRIC HEATER COMPANYWARNING / CAUTION HUBBELL ELECTRIC HEATER COMPANY P.O. BOXSTRATFORD, CT PHONE 203 FAX TABLE OF CONTENTS SECTIONTITLE PAGE #Page Page NOMENCLATURE FOR PARTS NOMENCLATURE FOR ACCESSORY PARTS Page GENERAL DESCRIPTION CONSTRUCTIONSECTION I - GENERAL DESCRIPTION AND CONSTRUCTION TANK Standard Tank ConstructionTANK CONNECTIONS OUTER SHELL, INSULATION, AND SUPPORTSSTEAM HEATING COIL STEAM OPERATING CONTROLS TrapsSteam Control Valves Single Solenoid Safety System Double Solenoid Safety SystemDial Temperature and Pressure Gauge OPTIONSWARNING / CAUTION SECTION II - INSTALLATION AND OPERATIONWATER HEATER PLACEMENT PIPING INSTALLATIONHOOK-UPOF AIR AND WATER OPERATED CONTROLS Typical Piping Diagram ELECTRICAL INSTALLATIONFILLING THE HEATER STARTUPSHUTDOWN SECTION III - SCHEDULED MAINTENANCE AND SERVICING WARNING / CAUTIONQUARTERLY INSPECTION ANNUAL INSPECTIONPage a.Shut down unit as described in Section Page Page SINGLE SAFETY SOLENOID SYSTEM if installed DOUBLE SAFETY SOLENOID SYSTEM if installed SECTION IV - ADJUSTMENT OF TEMPERATURE REGULATORS 5.ADJUSTMENT OF PILOT OPERATED VALVES 5Allow unit to heat until the valve closes off SECTION V - TROUBLESHOOTING SymptomSee separate component O&M for additional details Probable CauseExcessive vibration High rate of flow beyondWater hammer SECTION VI - MISCELLANEOUS CHARTS AND FORMULAS TORQUE VALUESMETRIC CONVERSIONS