Hitachi RAS-8FSXN - Page 4

4.1.4 Setting of the DSW switches on PCB1....................................................................................... 78
4.1.5 Electrical wiring diagram RAS-(8–18)FSXN............................................................................... 82
4.2 CH unit....................................................................................................................................... 83
4.2.1 General information.................................................................................................................... 83
4.2.2 General verifications................................................................................................................... 83
4.2.3 Electrical wiring connection CH units.......................................................................................... 83
5 Control system................................................................................................. 87
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
6 Optional functions........................................................................................... 113
6.1 Setting method........................................................................................................................... 114
6.2 External input and output setting................................................................................................ 115
6.2.1 External input function setting..................................................................................................... 116
6.2.2 External output function setting................................................................................................... 120
6.3 Function setting.......................................................................................................................... 123
6.3.1 Indoor unit fan control during the Thermo-OFF in heating mode................................................ 130
6.3.2 Night-shift (Low noise)................................................................................................................ 131
6.3.3 Cancellation of the outdoor ambient temperature limit............................................................... 132
6.3.4 Defrost for cold area (change of defrost condition)..................................................................... 133
6.3.5 SLo defrost setting...................................................................................................................... 133
6.3.6 Cancellation of hot start.............................................................................................................. 133
6.3.7 Demand function setting............................................................................................................. 133
6.3.8 Wave function setting.................................................................................................................. 134
6.3.9 Cold draft protection.................................................................................................................... 134
6.3.10 Adjustment of fan rotation........................................................................................................... 134
7 Test run............................................................................................................. 135
7.1 Preliminary checks..................................................................................................................... 136
Index
iv
SMGB0065 rev. 1 - 12/2010