American Water Heater STCE3-52/80/119 manual Commercial Electric Water Heater, Table Of Contents

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COMMERCIAL ELECTRIC WATER HEATER

SERVICE MANUAL

TABLE OF CONTENTS

INTRODUCTION	2	ELECTRONIC CONTROLS	41
Qualifications	2	CCB - Central Control Board	42
Service Warning	2	CCB Socket & Wiring Terminal Identification	43
Tools Required	3	CCB Enable Disable Circuit(s) Test	45
INSTALLATION CONSIDERATIONS	4	Checking Power And Ground To The CCB	46
Closed Water Systems	4	UIM - User Interface Module	47
Thermal Expansion	4	ELECTRONIC CONTROL SYSTEM	48
Electrical Requirements	5	Control System Features	48
PRE SERVICE CHECKS	6	Control System Navigation	48
Wiring Connections	6	The Desktop Screen	49
Service Precautions	5	Status Icons	50
WATER HEATER CONSTRUCTION	7	Operating States	51
Surface Mount Control Models	8	Control System Menus	51
Electronic Control Models	9	Temperatures Menu	52
OPERATION & SERVICE	10	Temperature Settings	53
Principles of Electricity	10	Heater Status Menu	54
Single And Three Phase Power	12	Economy Mode Setup Menu	55
Checking Single Phase Power	13	Setpoint Adjustment Value	56
Checking Three Phase Power	14	Time Clock Settings	57
Phase Conversions - Surface Mount Control Models	15	Daily Operating Mode Settings	58
Phase Conversions - Electronic Control Models	16	Alarm Output Setup Menu	59
Fuses	17	Display Settings Menu	60
Surface Mount Thermostats	18	Heater Information Menu	61
Thermostat & ECO Test	19	Current Fault/Alert Menu	62
Heating Elements	20	Fault History Menu	62
Heating Element Construction	20	Fault Occurrence Menu	62
Heating Element Amperage Test	23	Restore Factory Defaults Menu	63
Heating Element Voltage Test	24	Factory Default User Settings	63
Heating Element Resistance & Ground Test	25	TROUBLESHOOTING	64
Replacing Heating Elements	26	Common Service Problems	64
Element Sensors	27	Surface Mount Control Models	64
Element Sensor Operation	28	Electronic Control Models	65
Contactors	29	Fault Conditions	65
Contactor Configurations	30	Alert Conditions	65
Contactor Inspection	31	Resetting The Control System	65
Contactor Coil Voltage - At Contactor	32	Control System Unresponsive	65
Contactor Coil Voltage - At CCB	33	UIM Display Is Blank	65
Transformers	34	UIM Is Inoperable	66
120 VAC Control Circuit Transformer Wiring	34	Heating Cycle Disabled	66
120 VAC Control Circuit Transformer Test	35	Fault & Alert Messages	67
24 VAC Transformer Test	36	No Current Detected	67
Immersion Temperature Probes	37	Temp Probe Open	68
Temperature Sensor Resistance Test	38	Temp Probe Short	68
Temperature Sensor DC Voltage Test	39	Energy Cut Out (ECO)	69
ECO Continuity Test	39
ECO Voltage Test	40

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Contents Technical Support and Parts Service HandbookCOMMERCIAL ELECTRIC WATER HEATERS MODELS STCE3-52/80/119 & ITCE3-52/80/119Page TABLE OF CONTENTS SERVICE MANUALCOMMERCIAL ELECTRIC WATER HEATER INTRODUCTION QUALIFICATIONS - QUALIFIED SERVICE AGENTSERVICE WARNING IMPORTANT SERVICE REMINDERTOOLS REQUIRED INSTRUCTION MANUALINSTALLATION CONSIDERATIONS CLOSED WATER SYSTEMSTHERMAL EXPANSION Power Supply ELECTRICAL REQUIREMENTSGrounding PRE SERVICE CHECKS WIRING CONNECTIONSSERVICE PRECAUTIONS ELECTRONIC CONTROL MODELS HEATING ELEMENT CONFIGURATIONSWATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELSWATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELSWATER HEATER CONSTRUCTION Amperage OPERATION & SERVICEPRINCIPLES OF ELECTRICITY VoltageOhms Law applied to “SINGLE PHASE” 1Ø power Ohms LawCalculating Amps/Ohms/Volts/Watts L1 L2 L3 SINGLE AND THREE PHASE POWERChecking 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 BlockPHASE CONVERSIONS - SURFACE MOUNT CONTROL MODELS Surface Mount Control Models Three Phase to Single PhaseSurface Mount Control Models Single Phase to Three Phase PHASE CONVERSIONS - ELECTRONIC CONTROL MODELS Electronic Control Models Three Phase to Single PhaseElectronic Control Models Single Phase to Three Phase FUSES Ohm Meter MethodVolt Meter Method SURFACE MOUNT THERMOSTATS Thermostat & ECO Test HEATING ELEMENTS Heating Element ConstructionWire 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 TestThree 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 TRANSFORMERS120 VAC Control Circuit Transformer Test Primary Winding Voltage TestSecondary Winding Voltage Test 24 VAC Transformer Test ECO High Temperature Limit Switch IMMERSION TEMPERATURE PROBETemperature Sensor WATER TEMPERATURE Temperature Sensor Resistance TestTemperature Sensor Resistance Data Checking Temperature Sensor ResistanceDC Voltage To Temperature Sensor Temperature Sensor DC Voltage TestECO Continuity Test Checking ECO Switch ContinuityGround Connection ECO Voltage Test120 VAC To ECO 120 VAC From 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 Power and Ground To The CCB Checking for 120 VACChecking 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 ICON Table 1 Status IconsMENUS† Table 2 - Operating StatesTable 3 - Control System Menus STATETank Temperature Differential SettingsTEMPERATURES MENU Operating Set PointTemperature Settings HEATER STATUS MENU Enable / Disable 1Alarm Condition Alarm Relay OutputCurrent Time ECONOMY MODE SETUP MENUSetpoint Adjustment Desktop Screen During Economy Mode Economy Mode Setup MenuEconomy Mode Settings Setpoint Adjustment Value Economy Mode Settings Time Clock Settings Economy Mode Settings Daily Operating Mode Settings Economy Mode All DayNormal Operation Between Alarm Output Settings ALARM OUTPUT SETUP MENUTemp Alarm SP Used for external Alarm SPBacklight Delay DISPLAY SETTINGS MENUDisplay Settings Temperature UnitsBank # 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 MENU Restore Factory DefaultsFactory Default User Settings Not Enough Hot Water TROUBLESHOOTINGCOMMON SERVICE PROBLEMS No Hot WaterAlert Conditions Fault ConditionsResetting Control System CONTROL SYSTEM UNRESPONSIVEHeating Cycle Disabled Control System Unresponsive contUIM is Inoperable “No Current Detected” FAULT AND ALERT MESSAGESFault & Alert Messages “Temp Probe Open”“Temp Probe Short” “Energy Cut Out ECO” Page Page Page Page Technical Support and Parts