American Water Heater STCE3-52/80/119 Phase Conversions - Electronic Control Models, L1 L2 L3

Page 18
PHASE CONVERSIONS - ELECTRONIC CONTROL MODELS

OPERATION & SERVICE

PHASE CONVERSIONS - ELECTRONIC CONTROL MODELS

Internal wiring connections between the Power Distribution Block and the heating elements is different on Surface Mount Control (see Figure 1 page 8) and Electronic Control (see Figure 2 page 9) model water heaters. Because of these differences there are two methods for field converting these models to work with single and three phase power supplies.

Service Note: 208 volt 54 KW models are 3 phase only and CAN NOT be converted to single phase. All other models can be phase converted.

SECURE MAIN POWER SUPPLY TO THE WATER HEATER AT THE MAIN BREAKER OR DISCONNECT SWITCH FIRST.

Service Warning: Never touch any wiring inside the water heater until the main power supply to the water heater has been turned off. Verify with a volt meter that all wiring has no voltage present before touching any wiring inside the water heater’s control panel.

Electronic Control Models

Three Phase to Single Phase

1Disconnect blue wires and yellow wires from terminal L-3.

2Connect all blue wires to terminal L-1 (with black wires).

3Connect all yellow wires to terminal L-2 (with red wires).

4Incoming power will be connected to terminals L-1 and L-2.

Service Note: 208 volt 54 KW models are three phase only - these models CAN NOT be converted to single phase. Keep in mind when converting other models from three phase power to single phase power the current/amperage will increase significantly - ensure breakers, fuses and wiring are properly sized to allow for the increased amperage before placing the water heater back in service. Contact a Qualified/Licensed electrician to make necessary changes.

Power Distribution Block

(see Figure 2 on page 9)

L1 L2 L3

Electronic Control Models

Single Phase to Three Phase

1Disconnect blue wires from terminal L-1.

2Disconnect yellow wires from terminal L-2.

3Connect all blue wires and yellow wires to terminal L-3.

4Incoming power will be connected to terminals L-1, L-2 and L-3.

Service Note: Keep in mind when converting from single phase power to three phase power the current/amperage will decrease significantly - ensure breakers and fuses are not oversized before placing the water heater back in service. Contact a Qualified/ Licensed electrician to make necessary changes.

Power Distribution Block

(see Figure 2 on page 9)

L1 L2 L3

Servicing should only be performed by a Qualified Service Agent

16

Page 17 Page 19
Image 18
Page 17 Page 19
Contents MODELS STCE3-52/80/119 & ITCE3-52/80/119 Service HandbookCOMMERCIAL ELECTRIC WATER HEATERS Technical Support and PartsPage TABLE OF CONTENTS SERVICE MANUALCOMMERCIAL ELECTRIC WATER HEATER IMPORTANT SERVICE REMINDER QUALIFICATIONS - QUALIFIED SERVICE AGENTSERVICE WARNING INTRODUCTIONINSTRUCTION MANUAL TOOLS REQUIREDINSTALLATION CONSIDERATIONS CLOSED WATER SYSTEMSTHERMAL EXPANSION Power Supply ELECTRICAL REQUIREMENTSGrounding PRE SERVICE CHECKS WIRING CONNECTIONSSERVICE PRECAUTIONS 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 AmperageOhms Law applied to “SINGLE PHASE” 1Ø power Ohms LawCalculating Amps/Ohms/Volts/Watts 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 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 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 Winding120 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 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 Power and Ground To The CCB Checking for 120 VACChecking for Ground 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 Economy Mode Settings Daily Operating Mode Settings Economy Mode All DayNormal Operation Between 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 MenuRESTORE FACTORY DEFAULTS MENU Restore Factory DefaultsFactory Default User Settings No Hot Water TROUBLESHOOTINGCOMMON SERVICE PROBLEMS Not Enough Hot WaterCONTROL SYSTEM UNRESPONSIVE Fault ConditionsResetting Control System Alert ConditionsHeating Cycle Disabled Control System Unresponsive contUIM is Inoperable FAULT AND ALERT MESSAGES “No Current Detected”Fault & Alert Messages “Temp Probe Open”“Temp Probe Short” “Energy Cut Out ECO” Page Page Page Page Technical Support and Parts
Top Page Image Contents