American Water Heater COMMERCIAL ELECTRIC WATER HEATERS instruction

WATER HEATER CONSTRUCTION

ELECTRONIC CONTROL MODELS

Figure 2

Servicing should only be performed by a Qualified Service Agent

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American Water Heater COMMERCIAL ELECTRIC WATER HEATERS manual Electronic Control Models, Water Heater Construction

Contents

Technical Support and Parts Service HandbookCOMMERCIAL ELECTRIC WATER HEATERS MODELS STCE3-52/80/119 & ITCE3-52/80/119Page COMMERCIAL ELECTRIC WATER HEATER TABLE OF CONTENTSSERVICE MANUAL INTRODUCTION QUALIFICATIONS - QUALIFIED SERVICE AGENTSERVICE WARNING IMPORTANT SERVICE REMINDER TOOLS REQUIRED INSTRUCTION MANUAL THERMAL EXPANSION INSTALLATION CONSIDERATIONSCLOSED WATER SYSTEMS Grounding Power SupplyELECTRICAL REQUIREMENTS SERVICE PRECAUTIONS PRE SERVICE CHECKSWIRING CONNECTIONS ELECTRONIC CONTROL MODELS HEATING ELEMENT CONFIGURATIONSWATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELS WATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELS WATER HEATER CONSTRUCTION Amperage OPERATION & SERVICEPRINCIPLES OF ELECTRICITY Voltage Calculating Amps/Ohms/Volts/Watts Ohms Law applied to “SINGLE PHASE” 1Ø powerOhms Law L1 L2 L3 SINGLE AND THREE PHASE POWER Checking Single Phase 1Ø Power 3 L1 and L3 terminals of the water heater’s Power Distribution Block Checking Three Phase 3Ø Power1 L1 and L2 terminals of the water heater’s Power Distribution Block 2 L2 and L3 terminals of the water heater’s Power Distribution Block Surface Mount Control Models Single Phase to Three Phase PHASE CONVERSIONS - SURFACE MOUNT CONTROL MODELSSurface Mount Control Models Three Phase to Single Phase Electronic Control Models Single Phase to Three Phase PHASE CONVERSIONS - ELECTRONIC CONTROL MODELSElectronic Control Models Three Phase to Single Phase Volt Meter Method FUSESOhm Meter Method SURFACE MOUNT THERMOSTATS Thermostat & ECO Test Wire conductor inside tube HEATING ELEMENTSHeating Element Construction TOTAL Heating Element ConfigurationsNUMBER OF FACTORY INSTALLED Heating Element Ratings 208 VAC Heating Element AmperageELEMENT APPROXIMATE CURRENT - AMPS Heating Element Amperage Test Heating Element Voltage Test Measuring Resistance Heating Element Resistance & Ground Tests Replacing Heating Elements Heating Element Ground Test Three Current Sensors Element Sensor Functions ELEMENT SENSORSElement Sensor Construction Element Sensor Element Sensor Operation Contactor Construction - How They Work CONTACTORS Contactors Contactor ConfigurationsPower Connection Terminals Element Numbers/Connections Wire Colors to Elements Physically Operate Mechanical Contactor Inspection Contactor Coil Voltage - At Contactor Contactor Coil Voltage - At CCB H1 H2 H3 H4 H5 N/A Primary Winding Secondary Winding 120 VAC Control Circuit Transformer WiringX1 120 VAC TRANSFORMERS Secondary Winding Voltage Test 120 VAC Control Circuit Transformer TestPrimary Winding Voltage Test 24 VAC Transformer Test Temperature Sensor ECO High Temperature Limit SwitchIMMERSION TEMPERATURE PROBE WATER TEMPERATURE Temperature Sensor Resistance TestTemperature Sensor Resistance Data Checking Temperature Sensor Resistance DC Voltage To Temperature Sensor Temperature Sensor DC Voltage TestECO Continuity Test Checking ECO Switch Continuity Ground Connection ECO Voltage Test120 VAC To ECO 120 VAC From ECO UIM User Interface Module CCB Central Control Board ELECTRONIC CONTROLS CCB - CENTRAL CONTROL BOARD J4 Wiring Terminals - Contactor Coils CCB Socket & Wiring Terminal IdentificationJ2 Socket - 120 VAC Power Supply J3 Wiring Terminals - Alarm Output Relay see page J13 Socket - Heating Element Sensors Bank J7 Socket - Enable / Disable Circuits 1 & 2 see pages 45J16 Socket - Not Used J17 Wiring Terminals - Not Used J8 Socket - Not Used J9 Socket - Not Used J10 Socket - Not Used CCB Enable/Disable Circuits Test Checking for Ground Checking Power and Ground To The CCBChecking for 120 VAC UIM Circuit Board Front Service Notes - Button Pad Ribbon CableUIM - USER INTERFACE MODULE UIM Circuit Board Back UIM - User Interface Module CONTROL SYSTEM FEATURESELECTRONIC CONTROL SYSTEM CONTROL SYSTEM NAVIGATION THE DESKTOP SCREEN ICON Table 1 Status Icons MENUS† Table 2 - Operating StatesTable 3 - Control System Menus STATE Tank Temperature Differential SettingsTEMPERATURES MENU Operating Set Point Temperature Settings HEATER STATUS MENU Enable / Disable 1Alarm Condition Alarm Relay Output Current Time ECONOMY MODE SETUP MENUSetpoint Adjustment Desktop Screen During Economy Mode Economy Mode Setup Menu Economy Mode Settings Setpoint Adjustment Value Economy Mode Settings Time Clock Settings Normal Operation Between Economy Mode Settings Daily Operating Mode SettingsEconomy Mode All Day Alarm Output Settings ALARM OUTPUT SETUP MENUTemp Alarm SP Used for external Alarm SP Backlight Delay DISPLAY SETTINGS MENUDisplay Settings Temperature Units Bank # Cycles HEATER INFORMATION MENUElapsed Time Total Heating Time Main Menu - Current Fault Selected Fault History Menu CURRENT FAULT / ALERT MENUFAULT HISTORY MENU FAULT OCCURRENCE MENU Factory Default User Settings RESTORE FACTORY DEFAULTS MENURestore Factory Defaults Not Enough Hot Water TROUBLESHOOTINGCOMMON SERVICE PROBLEMS No Hot Water Alert Conditions Fault ConditionsResetting Control System CONTROL SYSTEM UNRESPONSIVE UIM is Inoperable Heating Cycle DisabledControl System Unresponsive cont “No Current Detected” FAULT AND ALERT MESSAGES “Temp Probe Short” Fault & Alert Messages“Temp Probe Open” “Energy Cut Out ECO” Page Page Page Page Technical Support and Parts