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OPERATION & SERVICE
Servicing should only be performed by a Qualified Service Agent
22
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.
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.
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
APPROXIMATE CURRENT - AMPSELEMENT
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
ELEMENT
WATTAGE
APPROXIMATE RESISTANCE - OHMS