Almost done here but may have the wrong thermostat. I have a SpacePak indoor unit, Goodman heat pump outdoor unit and a Honeywell RTH2410 thermostat. I'm installing this without auxiliary backup heat. The SpacePak wiring shows a wire between the C's on the indoor and outdoor units, and also between the C's on the indoor and thermostat. But the Honeywell doesn't have a C (Common). What do I do? Exchange for another thermostat? (It said it worked for heat pumps..)
One thing I didn't show in the attached diagram, the Honeywell book says to jump the Y and W/AUX together for heat pumps without auxiliary backup heat. Consider that done.
Thanks for any advice here.