American Water Heater STCE3-52/80/119 manual Heating Element Amperage, Approximate Current - Amps

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Heating Element Amperage

OPERATION & SERVICE

Heating Element Amperage

This table shows the approximate amp draw for the various heating elements used. First determine the actual rated wattage and voltage of the element being tested - see Heating Element Ratings on page 21. Then follow the Heating Element Amperage Test procedure on page 23 to measure amperage at each heating element. Compare the measured value to the values in the table below. Keep in mind there may be some variance between measured values and the values in this table due to fluctuations in voltage, temperature and the calibration of test instruments being used.

ELEMENT

APPROXIMATE CURRENT - AMPS

WATTAGE

208 VAC

240 VAC

277 VAC

480 VAC

2000

9.62

8.33

7.22

4.17

3000

14.42

12.50

10.83

6.25

4000

19.23

16.67

14.44

8.33

4500

21.63

18.75

16.25

9.38

5000

24.04

20.83

18.05

10.42

6000

28.85

25.00

21.66

12.50

Service Note - Correct Elements: If the measured amp draw on any element is considerably less or more than the values given in the table above check the element rating to ensure it matches the water heater’s factory configuration - see Heating Element Ratings and Heating Element Configurations on page 21. All heating elements should have the same voltage and KW rating in a water heater. If an element is not the correct rating for the water heater being serviced it must be replaced with a properly rated heating element.

Service Note - Grounded Elements: Grounded elements on Surface Mount Control Models (Figure 1 page 8) can draw low amps because power is continuously present at one terminal on each element - see the wiring diagram on page 18. Power from the thermostat’s L4 terminal is always present at each element and can flow from a grounded element through the water to the storage tank. If the measured amps are considerably less than the values in the table above test those elements for grounding - see page 25.

Heating Element Resistance

This table shows the approximate resistance (in ohms) for the various heating elements used. First determine the actual rated wattage and voltage of the element being tested - see Heating Element Ratings on page 21. Then follow the Measuring Resistance Test procedure on page 25 to measure the resistance of each heating element. Compare the measured value to the values in the table below. Keep in mind there will be some variance between measured values and the values in this table due to fluctuations in temperature and the calibration of test instruments being used.

ELEMENT

APPROXIMATE RESISTANCE - OHMS

WATTAGE

208 VAC

240 VAC

277 VAC

480 VAC

2000

21.63

28.80

38.36

115.20

3000

14.42

19.20

25.58

76.80

4000

10.82

14.40

19.18

57.60

4500

9.61

12.80

17.05

51.20

5000

8.65

11.52

15.35

46.08

6000

7.21

9.60

12.79

38.40

Servicing should only be performed by a Qualified Service Agent

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Contents Service Handbook COMMERCIAL ELECTRIC WATER HEATERSMODELS STCE3-52/80/119 & ITCE3-52/80/119 Technical Support and PartsPage TABLE OF CONTENTS SERVICE MANUALCOMMERCIAL ELECTRIC WATER HEATER QUALIFICATIONS - QUALIFIED SERVICE AGENT SERVICE WARNINGIMPORTANT SERVICE REMINDER INTRODUCTIONINSTRUCTION MANUAL TOOLS REQUIREDINSTALLATION CONSIDERATIONS CLOSED WATER SYSTEMSTHERMAL EXPANSION Power Supply ELECTRICAL REQUIREMENTSGrounding PRE SERVICE CHECKS WIRING CONNECTIONSSERVICE PRECAUTIONS HEATING ELEMENT CONFIGURATIONS WATER HEATER CONSTRUCTIONSURFACE MOUNT CONTROL MODELS ELECTRONIC CONTROL MODELSSURFACE MOUNT CONTROL MODELS WATER HEATER CONSTRUCTIONELECTRONIC CONTROL MODELS OPERATION & SERVICE PRINCIPLES OF ELECTRICITYVoltage 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 Checking Three Phase 3Ø Power 1 L1 and L2 terminals of the water heater’s Power Distribution Block2 L2 and L3 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 Configurations NUMBER OF FACTORY INSTALLEDHeating Element Ratings TOTALHeating Element Amperage ELEMENTAPPROXIMATE CURRENT - AMPS 208 VACHeating Element Amperage Test Heating Element Voltage Test Heating Element Resistance & Ground Tests Measuring ResistanceHeating Element Ground Test Replacing Heating ElementsELEMENT SENSORS Element Sensor ConstructionElement Sensor Three Current Sensors Element Sensor FunctionsElement Sensor Operation CONTACTORS Contactor Construction - How They WorkContactor Configurations Power Connection TerminalsElement Numbers/Connections Wire Colors to Elements ContactorsContactor Inspection Physically Operate MechanicalContactor Coil Voltage - At Contactor Contactor Coil Voltage - At CCB 120 VAC Control Circuit Transformer Wiring X1 120 VACTRANSFORMERS 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 Temperature Sensor Resistance Test Temperature Sensor Resistance DataChecking Temperature Sensor Resistance WATER TEMPERATURETemperature Sensor DC Voltage Test ECO Continuity TestChecking ECO Switch Continuity DC Voltage To Temperature SensorECO Voltage Test 120 VAC To ECO120 VAC From ECO Ground ConnectionELECTRONIC CONTROLS UIM User Interface Module CCB Central Control BoardCCB - CENTRAL CONTROL BOARD CCB Socket & Wiring Terminal Identification J2 Socket - 120 VAC Power SupplyJ3 Wiring Terminals - Alarm Output Relay see page J4 Wiring Terminals - Contactor CoilsJ7 Socket - Enable / Disable Circuits 1 & 2 see pages 45 J16 Socket - Not Used J17 Wiring Terminals - Not UsedJ8 Socket - Not Used J9 Socket - Not Used J10 Socket - 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 Service Notes - Button Pad Ribbon Cable UIM - USER INTERFACE MODULEUIM Circuit Board Back UIM Circuit Board FrontCONTROL SYSTEM FEATURES ELECTRONIC CONTROL SYSTEMCONTROL SYSTEM NAVIGATION UIM - User Interface ModuleTHE DESKTOP SCREEN Table 1 Status Icons ICONTable 2 - Operating States Table 3 - Control System MenusSTATE MENUS†Differential Settings TEMPERATURES MENUOperating Set Point Tank TemperatureTemperature Settings Enable / Disable 1 Alarm ConditionAlarm Relay Output HEATER STATUS MENUECONOMY MODE SETUP MENU Setpoint AdjustmentDesktop Screen During Economy Mode Economy Mode Setup Menu 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 OUTPUT SETUP MENU Temp Alarm SP Used for externalAlarm SP Alarm Output SettingsDISPLAY SETTINGS MENU Display SettingsTemperature Units Backlight DelayHEATER INFORMATION MENU Elapsed TimeTotal Heating Time Bank # CyclesCURRENT FAULT / ALERT MENU FAULT HISTORY MENUFAULT OCCURRENCE MENU Main Menu - Current Fault Selected Fault History MenuRESTORE FACTORY DEFAULTS MENU Restore Factory DefaultsFactory Default User Settings TROUBLESHOOTING COMMON SERVICE PROBLEMSNo Hot Water Not Enough Hot WaterFault Conditions Resetting Control SystemCONTROL SYSTEM UNRESPONSIVE 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
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