Electronic Controls

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 REMINDER TOOLS REQUIRED INSTRUCTION MANUAL CLOSED 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 MODELS WATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELS WATER HEATER CONSTRUCTION Amperage OPERATION & SERVICEPRINCIPLES OF ELECTRICITY Voltage Ohms Law Ohms Law applied to “SINGLE PHASE” 1Ø powerCalculating Amps/Ohms/Volts/Watts 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 Three Phase to Single Phase PHASE CONVERSIONS - SURFACE MOUNT CONTROL MODELSSurface Mount Control Models Single Phase to Three Phase Electronic Control Models Three Phase to Single Phase PHASE CONVERSIONS - ELECTRONIC CONTROL MODELSElectronic Control Models Single Phase to Three Phase Ohm Meter Method FUSESVolt Meter Method SURFACE MOUNT THERMOSTATS Thermostat & ECO Test Heating Element Construction HEATING ELEMENTSWire conductor inside tube 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 Primary Winding Voltage Test 120 VAC Control Circuit Transformer TestSecondary Winding Voltage Test 24 VAC Transformer Test IMMERSION TEMPERATURE PROBE ECO High Temperature Limit SwitchTemperature Sensor 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 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 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 Economy Mode All Day Economy Mode Settings Daily Operating Mode SettingsNormal Operation Between 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 Restore Factory Defaults RESTORE FACTORY DEFAULTS MENUFactory Default User Settings Not Enough Hot Water TROUBLESHOOTINGCOMMON SERVICE PROBLEMS No Hot Water Alert Conditions Fault ConditionsResetting Control System CONTROL SYSTEM UNRESPONSIVE Control System Unresponsive cont Heating Cycle DisabledUIM is Inoperable “No Current Detected” FAULT AND ALERT MESSAGES “Temp Probe Open” Fault & Alert Messages“Temp Probe Short” “Energy Cut Out ECO” Page Page Page Page Technical Support and Parts

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

UIM (User Interface Module)