American Water Heater COMMERCIAL ELECTRIC WATER HEATERS Single And Three Phase Power, L1 L2 L3

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SINGLE AND THREE PHASE POWER

OPERATION & SERVICE

SINGLE AND THREE PHASE POWER

The water heaters covered in this manual can be field converted for a single or three phase power supply - see pages 15 and 16. These water heaters can be factory ordered for standard North American power supplies; 277/208/240/480 volt models. 277 volt models are single phase only. Voltage conversion kits with instructions are available from the manufacturer - voltage conversions are not covered in this manual. Verifying the power supply is adequate is typical first step during most service diagnostic procedures. The illustrations and instructions that follow outline how this is done using a standard AC volt meter - see Tools Required on page 3.

Service Warning: Never touch any wiring inside the water heater until the main power supply to the water heater has been secured. Secure power to the water heater by turning off the power supply breaker and/or disconnect switch AND verify with a volt meter that all wiring has no voltage present before touching any wiring inside the water heater’s control panel.

Service Warning: Zero or low voltage readings between internal wiring and/or Power Distribution Block terminals and ground can be due to an inadequate earth ground. TREAT ALL WIRES AS BEING HOT until it has been determined there is no voltage present.

L1 L2 L3

Power Distribution Block

(see Figures 1 & 2 on pages 8 and 9)

277 Volt 1Ø Power

208/240/480 Volt 1Ø Power

208/240/480 Volt 3Ø Power

Servicing should only be performed by a Qualified Service Agent

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Contents MODELS STCE3-52/80/119 & ITCE3-52/80/119 Service HandbookCOMMERCIAL ELECTRIC WATER HEATERS Technical Support and PartsPage COMMERCIAL ELECTRIC WATER HEATER TABLE OF CONTENTSSERVICE MANUAL IMPORTANT SERVICE REMINDER QUALIFICATIONS - QUALIFIED SERVICE AGENTSERVICE WARNING INTRODUCTIONINSTRUCTION MANUAL TOOLS REQUIREDTHERMAL EXPANSION INSTALLATION CONSIDERATIONSCLOSED WATER SYSTEMS Grounding Power SupplyELECTRICAL REQUIREMENTS SERVICE PRECAUTIONS PRE SERVICE CHECKSWIRING CONNECTIONS SURFACE MOUNT CONTROL MODELS HEATING ELEMENT CONFIGURATIONSWATER HEATER CONSTRUCTION ELECTRONIC CONTROL MODELSSURFACE MOUNT CONTROL MODELS WATER HEATER CONSTRUCTIONELECTRONIC CONTROL MODELS Voltage OPERATION & SERVICEPRINCIPLES OF ELECTRICITY AmperageCalculating Amps/Ohms/Volts/Watts Ohms Law applied to “SINGLE PHASE” 1Ø powerOhms Law SINGLE AND THREE PHASE POWER L1 L2 L3Checking Single Phase 1Ø Power 2 L2 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 3 L1 and L3 terminals of the water heater’s Power Distribution BlockSurface 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 Heating Element Ratings Heating Element ConfigurationsNUMBER OF FACTORY INSTALLED TOTALAPPROXIMATE CURRENT - AMPS Heating Element AmperageELEMENT 208 VACHeating Element Amperage Test Heating Element Voltage Test Heating Element Resistance & Ground Tests Measuring ResistanceHeating Element Ground Test Replacing Heating ElementsElement Sensor ELEMENT SENSORSElement Sensor Construction Three Current Sensors Element Sensor FunctionsElement Sensor Operation CONTACTORS Contactor Construction - How They WorkElement Numbers/Connections Wire Colors to Elements Contactor ConfigurationsPower Connection Terminals ContactorsContactor Inspection Physically Operate MechanicalContactor Coil Voltage - At Contactor Contactor Coil Voltage - At CCB TRANSFORMERS 120 VAC Control Circuit Transformer WiringX1 120 VAC H1 H2 H3 H4 H5 N/A Primary Winding Secondary WindingSecondary 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 Checking Temperature Sensor Resistance Temperature Sensor Resistance TestTemperature Sensor Resistance Data WATER TEMPERATUREChecking ECO Switch Continuity Temperature Sensor DC Voltage TestECO Continuity Test DC Voltage To Temperature Sensor120 VAC From ECO ECO Voltage Test120 VAC To ECO Ground ConnectionELECTRONIC CONTROLS UIM User Interface Module CCB Central Control BoardCCB - CENTRAL CONTROL BOARD J3 Wiring Terminals - Alarm Output Relay see page CCB Socket & Wiring Terminal IdentificationJ2 Socket - 120 VAC Power Supply J4 Wiring Terminals - Contactor CoilsJ8 Socket - Not Used J9 Socket - Not Used J10 Socket - Not Used J7 Socket - Enable / Disable Circuits 1 & 2 see pages 45J16 Socket - Not Used J17 Wiring Terminals - Not Used J13 Socket - Heating Element Sensors BankCCB Enable/Disable Circuits Test Checking for Ground Checking Power and Ground To The CCBChecking for 120 VAC UIM Circuit Board Back Service Notes - Button Pad Ribbon CableUIM - USER INTERFACE MODULE UIM Circuit Board FrontCONTROL SYSTEM NAVIGATION CONTROL SYSTEM FEATURESELECTRONIC CONTROL SYSTEM UIM - User Interface ModuleTHE DESKTOP SCREEN Table 1 Status Icons ICONSTATE Table 2 - Operating StatesTable 3 - Control System Menus MENUS†Operating Set Point Differential SettingsTEMPERATURES MENU Tank TemperatureTemperature Settings Alarm Relay Output Enable / Disable 1Alarm Condition HEATER STATUS MENUDesktop Screen During Economy Mode Economy Mode Setup Menu ECONOMY MODE SETUP MENUSetpoint Adjustment Current TimeEconomy 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 SP ALARM OUTPUT SETUP MENUTemp Alarm SP Used for external Alarm Output SettingsTemperature Units DISPLAY SETTINGS MENUDisplay Settings Backlight DelayTotal Heating Time HEATER INFORMATION MENUElapsed Time Bank # CyclesFAULT OCCURRENCE MENU CURRENT FAULT / ALERT MENUFAULT HISTORY MENU Main Menu - Current Fault Selected Fault History MenuFactory Default User Settings RESTORE FACTORY DEFAULTS MENURestore Factory Defaults No Hot Water TROUBLESHOOTINGCOMMON SERVICE PROBLEMS Not Enough Hot WaterCONTROL SYSTEM UNRESPONSIVE Fault ConditionsResetting Control System Alert ConditionsUIM is Inoperable Heating Cycle DisabledControl System Unresponsive cont FAULT AND ALERT MESSAGES “No Current Detected”“Temp Probe Short” Fault & Alert Messages“Temp Probe Open” “Energy Cut Out ECO” Page Page Page Page Technical Support and Parts
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