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
22
