The solenoid is 24VAC, so I'm not too worried about killing myself. The part I'm a little unsure of is where exactly to wire the relay into the furnace's control box.

The In-Furnace Controls Diagram parameter screen gives an overview of the in-furnace controls. It will vary slightly depending on the options shown in the next screen, Config . This diagram does not ...

Verify that your heat pump thermostat wiring is properly attached, according to the wiring diagram. “Make sure the wires are tight and all the way in the new thermostat,” Sherman says.