... )>Compact design> Easy and efficient installation Built in stop valve 4 way piping is possible(front,rear,right,down ... units:12HP,14HP,16HP5.Free combination up to 48HP with incremental 2HP,max.indoor units up to 64T3 ... 10HP,12HP 4. Free combination up to 36HP with incremental 2HP,max.indoor units up to 365.High ... 10HP,12HP 4. Free combination up to 48HP with incremental 2HP,max.indoor units up to 642 Way ...