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Aux heat
Now when the Arctic Heat Pump calls for supplemental back up heat, the dry contact behind terminal
E1/E2 will close, signaling to the boiler to begin contributing energy via its electric heating element.
Because R and W are closed this will turn on the back up heat. The Eco ULTRA will do so systematically
only applying as much heat energy as needed. When the tank reaches its target temperature (set up in the
heat pump controller), the call for back up heat will end, and the boiler will turn off. During this period the
hydronic pump will continue to stay on as long as there is thermostatic call regardless whether the energy
is coming from the heat pump or the Eco ULTRA (see separate manual for setting up pump and room
thermostat on Eco ULTRA).
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