UNITS WITH ELECTRIC HEATING ELEMENTS:
Units with electric elements CANNOT be fully electrically isolated (per the National Electric Code). The solution is then to ground to a single point. But the single point ground must run through the panel providing power for the electric elements. The following diagram shows a typical GARN installation with electric heating elements, no electrical isolation and potentially three separate ground paths: one through the electrical panel feeding the pump and controller, one through the independent ground rod of the GARN unit, and one through the electric element sequencer.
3. Ensure that the unit is grounded through the element box by attaching the ground wire to one of the studs in the electric element box. The ground wire must ultimately run back to ground of the meter/panel supplying power to the electric elements.
ATTACH THE GROUND WIRE TO THE ELECTRIC ELEMENT BOX MOUNTING STUD
The goal is to build to a single-ground point through the element box, the sequencer box, and ultimately the ground rod associated with the electric heating element service. To do this: 1. Follow the steps in the FULL ISOLATION (OPTION 1) section. 2. After completing the full isolation steps, the installation should now look like the following figure. The only ground connection should be through the sequencer box.
4. Single-point grounding with electric heating elements is now complete.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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