Hybrid Air Handling Unit - HD During normal mode, the chilled water and hot water are connected from the central utilities. During Local mode, the chiller will give chilled water as well as hot water (hot water generated from condenser). Same Hot water is used to make steam for regeneration of Rotor. It is ideal for situations where Temperature and LOW Relative Humidity to be maintained continuously and where, steam from Boiler is not available. Special rotor can be Regenerated @ 60°C.