Fujitsu H-Series and VRF Air Handler With Backup Heat and 3rd party Thermostat

If you are looking to use a third party Thermostat with Fujitsu air Handler then you have to take a couple steps to make this work. 

First you need the UTY-TTRXZ1 third party Thermostat adapter. Then you also a Fujitsu wired controller such as the UTY-RNRUZ5 or UTY-RVRU.

You will need to complete all function settings with the Fujitsu controller before adding the third party thermostat adapter.

Function 60, 61, 62  need to be dealt with. 

Then you need to set up the adapter to give setpoints that won't force the electric heater on all the time.