Hitachi RAS-8FSXN - Page 94

5. C o n t r o l s y s t e m
Index
5.1
Control system........................................................................................................................... 88
5.1.1 Cycle control................................................................................................................................. 88
5.1.2 Compressor operation control....................................................................................................... 89
5.1.3 Heat exchanger mode control....................................................................................................... 94
5.1.4 Outline of the control system......................................................................................................... 95
5.2 Standard operation sequence.................................................................................................... 97
5.2.1 Cooling operation.......................................................................................................................... 97
5.2.2 Cooling operation (continued)....................................................................................................... 98
5.2.3 Dry operation................................................................................................................................. 99
5.2.4 Dry operation (continued).............................................................................................................. 100
5.2.5 Antifreeze protection control during the cooling or dry operation.................................................. 101
5.2.6 Heating operation.......................................................................................................................... 102
5.2.7 Heating operation (continued)....................................................................................................... 103
5.2.8 Defrost operation........................................................................................................................... 104
5.2.9
Excessive high discharge air temperature prevention control (only for RCI, RCD and RPI (≤ 6
HP))............................................................................................................................................... 105
5.2.10 Protection control.......................................................................................................................... 106
5.2.11 Control of CH unit (CH-(6.0/10.0)N1)............................................................................................ 109
5.3 Control and safety devices......................................................................................................... 111
5.3.1 Outdoor unit.................................................................................................................................. 111
5.3.2 CH unit.......................................................................................................................................... 111
5 Control system
87
SMGB0065 rev. 1 - 12/2010
5