1.Double stage coupling refrigeration cycle system design, a R410A /R32system, two stage R134 /R515B /R1233yz system 2.Maximum outlet temperature 85℃/95℃ 3.Ambient temperature range: -35℃~43℃ 4.Unit modular design, multiple units in parallel to increase the total heat, centralized control. 5.4G DTU remote control unit