I installed a new 15k Penguin AC unit with heat pump only to find this unit will not function with the installed five button thermostat. I had to upgrade to a newer 10 button model for those considering a replacement. My question concerns what appears to be a relay in the 5" X 5" junction wire box, because the new AC came with the smaller 2-1/2 x 5" box and no relay. I am guessing it keeps both front and rear units from starting at the same time because it appears to interrupt ground. I emailed Dometic for some guidance, but no response for a week. I know the electronics in this new unt is more sophisticated, but can it eliminate this relay/solenoid in the old junction box? Does anyone have experience with this issue?
By the way I found the connection to the ductwork restricted airflow by at least 30%, that is air outlet and the inlet to the duct were misaligned by an 1-1/2" and the connector tube was squashed. Don't know if the unit was previously replaced, but given where the hole in duct is located it appears to be a factory manufacturing issue. New one works great after my modifications to the intake duct.