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American Water Heater COMMERCIAL ELECTRIC WATER HEATERS “Energy Cut Out ECO”, Troubleshooting

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

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Page 71

“Energy Cut Out (ECO)”

TROUBLESHOOTING

Fault & Alert Messages

	DISPLAYED MESSAGE	CHECK/REPAIR
	CONDITION/INDICATES	CHECK/REPAIR
	CONDITION/INDICATES

	“Energy Cut Out (ECO)”	• Check the J5 plug/socket connections at the
	(Fault Condition)	CCB ensure they are mating properly and pro-
		viding good contact. Check the pins inside the
	The control system has detected excessive water	J5 plug/socket for wear or damage. See CCB
	temperature inside the water heater. The ECO high	illustration and socket identification on pages 42
	temperature limit switch activates at 202°F/94°C.	- 44. Replace damaged plug connectors/wiring
	See ECO High Temperature Limit Switch description	harness as necessary.
	on page 37.	• Check for pinched or broken wiring between the
	Possible Causes:	Immersion Temperature Probe and the J5 plug/
	Possible Causes:	socket connection on the CCB - repair or
	Plug/socket connection problems	replace damaged wiring as necessary. See
	Wiring connection problems	CCB illustration and socket identification on
	Contactor(s) stuck closed	pages 42 - 44.
	Contactor coils being energized in standby mode	• Check ECO continuity and for 120 VAC to and
	Defective Immersion Temperature Probe	• Check ECO continuity and for 120 VAC to and
	Defective Immersion Temperature Probe	from the ECO - see pages 37 - 40. Replace
	Water piping problems	from the ECO - see pages 37 - 40. Replace
	Water piping problems	Immersion Temperature Probe if ECO switch
		Immersion Temperature Probe if ECO switch
		contacts remain open at normal operating tem-
		peratures.
		• Ensure the contactors are not stuck closed - see
		page 31.
		• Ensure the contactor coils are not being ener-
		gized during standby mode - see pages 32 &
		33.
		• Check water system piping; ensure heat is not
		being added to the water inside the water heater
		being serviced by any other heating appliances
		or heat sources.
		• Call the toll free technical support phone num-
		ber on the back cover of this manual for further
		assistance if the problem has not been cor-
		rected after performing the procedures outlined
		here.

Servicing should only be performed by a Qualified Service Agent

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American Water Heater COMMERCIAL ELECTRIC WATER HEATERS “Energy Cut Out ECO”, Fault & Alert Messages, Troubleshooting

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 REMINDERTOOLS REQUIRED INSTRUCTION MANUALTHERMAL 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 MODELSWATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELSWATER HEATER CONSTRUCTION ELECTRONIC CONTROL MODELSAmperage OPERATION & SERVICEPRINCIPLES OF ELECTRICITY VoltageCalculating Amps/Ohms/Volts/Watts Ohms Law applied to “SINGLE PHASE” 1Ø powerOhms Law 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 PhaseVolt Meter Method FUSESOhm Meter Method SURFACE MOUNT THERMOSTATS OPERATION & SERVICE Thermostat & ECO TestWire conductor inside tube HEATING ELEMENTSHeating Element Construction 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 TestsOPERATION & SERVICE Heating Element Ground TestReplacing Heating Elements 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 TestTemperature Sensor IMMERSION TEMPERATURE PROBEECO High Temperature Limit Switch 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 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 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 MENUFactory Default User Settings RESTORE FACTORY DEFAULTS MENURestore Factory Defaults 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 Short” Fault & Alert Messages“Temp Probe Open” Fault Condition “Energy Cut Out ECO”Fault & Alert Messages TROUBLESHOOTINGPage Page Page Page Technical Support and Parts