One display that drew quite a few eyes at the Fujitsu General America booth this year revealed the reality behind what sounds like some engineering sleigh of hand. The company highlighted a DX kit that transition an existing air handler into part of an Airstage VRF system.
The air handler in question needs to be using R-410A. If it does, then the kit can integrate into the existing RTU and will power the existing coil in units made by a variety of manufacturers. The company said it will work on units ranging from .75 to 15 tons.