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American Water Heater ITCE3-52/80/119, STCE3-52/80/119 manual Electronic Controls

Models: ITCE3-52/80/119 COMMERCIAL ELECTRIC WATER HEATERS STCE3-52/80/119

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ELECTRONIC CONTROLS

This section covers the electronic control system used on Electronic Control Models - see Figure 1 on page 9. The control system includes a CCB (Central Control Board) and a UIM (User Interface Module).

The CCB constantly monitors safely controls, heating elements, water temperature and other functions of the water heater. Operational information is continuously reported to the user through text and icons on the liquid crystal display (LCD) portion of the UIM. When there are operational problems Fault and Alert messages will also be displayed. Users can navigate through multiple control system menus to view operational information and change user settings - see the Electronic Control System section beginning on page 48.

UIM (User Interface Module)

CCB (Central Control Board)

Servicing should only be performed by a Qualified Service Agent

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American Water Heater ITCE3-52/80/119 manual Electronic Controls, UIM User Interface Module CCB Central Control Board

Contents

Technical Support and Parts Service HandbookCOMMERCIAL ELECTRIC WATER HEATERS MODELS STCE3-52/80/119 & ITCE3-52/80/119Page SERVICE MANUAL TABLE OF CONTENTSCOMMERCIAL ELECTRIC WATER HEATER INTRODUCTION QUALIFICATIONS - QUALIFIED SERVICE AGENTSERVICE WARNING IMPORTANT SERVICE REMINDERTOOLS REQUIRED INSTRUCTION MANUALCLOSED WATER SYSTEMS INSTALLATION CONSIDERATIONSTHERMAL EXPANSION ELECTRICAL REQUIREMENTS Power SupplyGrounding WIRING CONNECTIONS PRE SERVICE CHECKSSERVICE PRECAUTIONS ELECTRONIC CONTROL MODELS HEATING ELEMENT CONFIGURATIONSWATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELSWATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELSWATER HEATER CONSTRUCTION ELECTRONIC CONTROL MODELSAmperage OPERATION & SERVICEPRINCIPLES OF ELECTRICITY VoltageOhms Law Ohms Law applied to “SINGLE PHASE” 1Ø powerCalculating Amps/Ohms/Volts/Watts L1 L2 L3 SINGLE AND THREE PHASE POWER208/240/480 Volt 1Ø Power Checking Single Phase 1Ø PowerPower Distribution Block 277 Volt 1Ø Power3 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 BlockL1 L2 L3 PHASE CONVERSIONS - SURFACE MOUNT CONTROL MODELSSurface Mount Control Models Three Phase to Single Phase Surface Mount Control Models Single Phase to Three PhaseL1 L2 L3 PHASE CONVERSIONS - ELECTRONIC CONTROL MODELSElectronic Control Models Three Phase to Single Phase Electronic Control Models Single Phase to Three PhaseOhm Meter Method FUSESVolt Meter Method SURFACE MOUNT THERMOSTATS OPERATION & SERVICE Thermostat & ECO TestHeating Element Construction HEATING ELEMENTSWire conductor inside tube TOTAL Heating Element ConfigurationsNUMBER OF FACTORY INSTALLED Heating Element Ratings208 VAC Heating Element AmperageELEMENT APPROXIMATE CURRENT - AMPSHeating Element Amperage Test Heating Element Voltage Test Measuring Resistance Heating Element Resistance & Ground TestsReplacing Heating Elements Heating Element Ground TestOPERATION & SERVICE Three Current Sensors Element Sensor Functions ELEMENT SENSORSElement Sensor Construction Element SensorElement Sensor Operation Contactor Construction - How They Work CONTACTORSContactors Contactor ConfigurationsPower Connection Terminals Element Numbers/Connections Wire Colors to ElementsPhysically Operate Mechanical Contactor InspectionContactor 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 TRANSFORMERSSecondary Winding Voltage Test 120 VAC Control Circuit Transformer TestOPERATION & SERVICE Primary Winding Voltage TestSecondary Winding Voltage Test 24 VAC Transformer TestOPERATION & SERVICE Primary Winding Voltage TestECO High Temperature Limit Switch IMMERSION TEMPERATURE PROBETemperature Sensor Checking Temperature Sensor Resistance Temperature Sensor Resistance TestTemperature Sensor Resistance Data OPERATION & SERVICEDC Voltage To Temperature Sensor Temperature Sensor DC Voltage TestECO Continuity Test OPERATION & SERVICE120 VAC From ECO ECO Voltage TestOPERATION & SERVICE 120 VAC To ECOUIM User Interface Module CCB Central Control Board ELECTRONIC CONTROLSCCB - 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 pageJ13 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 UsedCCB Enable/Disable Circuits Test Checking for 120 VAC Checking Power and Ground To The CCBChecking for Ground UIM Circuit Board Front Service Notes - Button Pad Ribbon CableUIM - USER INTERFACE MODULE UIM Circuit Board BackUIM - User Interface Module CONTROL SYSTEM FEATURESELECTRONIC CONTROL SYSTEM CONTROL SYSTEM NAVIGATIONTHE DESKTOP SCREEN DESCRIPTION Table 1 Status IconsELECTRONIC CONTROL SYSTEM ICONSTATE Table 2 - Operating StatesTable 3 - Control System Menus ELECTRONIC CONTROL SYSTEMOperating Set Point TEMPERATURES MENUDifferential Settings Tank TemperatureTemperature Settings HEATER STATUS MENU Enable / Disable 1Alarm Condition Alarm Relay OutputDesktop Screen During Economy Mode Economy Mode Setup Menu ECONOMY MODE SETUP MENUSetpoint Adjustment Heater In Economy ModeDISPLAY Economy Mode Settings Setpoint Adjustment ValueELECTRONIC CONTROL SYSTEM ACTIONDISPLAY Economy Mode Settings Time Clock SettingsELECTRONIC CONTROL SYSTEM ACTIONACTION Economy Mode Settings Daily Operating Mode SettingsEconomy Mode All Day ELECTRONIC CONTROL SYSTEMAlarm Output Settings ALARM OUTPUT SETUP MENUTemp Alarm SP Used for external Alarm SPDisplay Settings DISPLAY SETTINGS MENUTemperature Units Backlight DelayBank # Cycles HEATER INFORMATION MENUElapsed Time Total Heating TimeMain Menu - Current Fault Selected Fault History Menu CURRENT FAULT / ALERT MENUFAULT HISTORY MENU FAULT OCCURRENCE MENURestore Factory Defaults RESTORE FACTORY DEFAULTS MENUFactory Default User Settings Not Enough Hot Water TROUBLESHOOTINGCOMMON SERVICE PROBLEMS No Hot WaterAlert Conditions Fault ConditionsResetting Control System CONTROL SYSTEM UNRESPONSIVETROUBLESHOOTING Heating Cycle DisabledControl System Unresponsive cont UIM is Inoperable“No Current Detected” FAULT AND ALERT MESSAGES“Temp Probe Open” Fault & Alert Messages“Temp Probe Short” Fault Condition “Energy Cut Out ECO”Fault & Alert Messages TROUBLESHOOTINGPage Page Page Page Technical Support and Parts