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Activity D | Checking Elements
The following steps verify the heating elements are working correctly. The heating elements will
only draw voltage when hot water is being called for and uses only the voltage needed based on
the temperature setting. This feature is called self-modulation. When hot water is ‘demanded’
the elements instantly draw power. The heating elements then work in series, which means that
the element #1 (located on the inlet side of the unit) will be the first to draw power. In order for
the second element to draw power, the first element must be drawing at 100% capacity.
1.
Locate elements
A.
There are two red wires connected to the top of each element. To check if the element
is working, turn on a hot water tap. We suggest running the shower or sink so that both
elements will draw voltage and can be checked. Once water is running through the unit,
the LED display will light up and show the temperature setting on the unit. Using a volt
meter, place one probe on one screw and the other probe on the other screw located
on the top of the element (
see image 2-A
). Check what voltage is being drawn.
B.
When measuring voltage across the top of the elements there will be a reading between
220v – 240v. You must have water running in order for the elements to activate and draw
power.
C.
If LED display is illuminated, water is running through the unit, and a 0 voltage reading is
given (when measuring with probes on each screw), perform conductivity test:
i.
Turn breaker OFF, set meter for ohms and place one probe on one screw and the
other probe on the other screw located on the top of the element. (
see image 2-A
)
