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The wire you just ran should have a bare copper wire. Just connect the ground wire from water heater to this wire. If you leave the heater set to heat pump only ( the most efficient setting ) does it trip the breaker then or only when it's set for the heat elements to also come on ?
If you ran 10-2 wire to this unit it should have a bare copper conductor inside the romex besides the black and white wires or black and red.
You asked how to correctly wire this unit and I told you wire the bare copper wire on the wire you ran to the ground wire ( the green wire ) of the water heater. What kind of answer were you looking for ??