The Fujitsu UTY-TTRXZ1 24V Thermostat Interface controls Halcyon products using a third party thermostat. Up to 16 indoor units can be connected as a group to one thermostat convertor.
Requires installation of 24V transformer (included)

Allows the ability to control Fujitsu indoor units with a 3rd party thermostat
Can be connected to up to 16 indoor units

UTY-TTRXZ1 24V Thermostat Converter
24Vac transformer
UTY-WIFI Plug

Allows Fujitsu indoor units to be connected to third party thermostats with 24Vac outputs, such as Honeywell, Nest, etc..
Up to 16 indoor units may be controlled with a single thermostat controller
Multiple indoor units connected to the interface can be operated by the same operating setting
Multi-speed fan control

Power Supply DC: 12.72-19.08 V
Max Power Consumption: .6 W
Wire Type: Non polar 2 or 3 core sheathed PVC cable
Operating Temperature Range: 32-114 F
Storage Temperature Range: 14-140 F
Humidity Range: 0-95%
Weight: 4 oz
Dimensions (HxWxD): 1 1/16" x 3 7/16" x 3 7/16"