Hitachi UTOPIA RAS-4HVRP2E Service Manual page 7

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5. Control System ........................................................................................................ 79
5.1 Device control system ........................................................................................................................... 80
5.1.1 RAS-3HVRC2 ................................................................................................................................................ 80
5.1.2 RAS-(4-6)H(V)(R/N)(C/P)2E ......................................................................................................................... 81
5.1.3 Outline of the control system ......................................................................................................................... 82
5.2 Outdoor units Printed circuit board (PCB) ............................................................................................. 84
5.2.1 RAS-3HVRC2 ................................................................................................................................................ 84
5.2.2 RAS-(4-6)H(V)(R/N)(P/C)2E ......................................................................................................................... 85
5.2.2.1 RAS-(4-6)HV(R/N)(C/P)2E (PCB1) .................................................................................................. 85
5.2.2.2 RAS-(4-6)H(R/N)(C/P)2E (PCB) ...................................................................................................... 86
5.3 Protection control .................................................................................................................................. 87
5.3.1 Protection control code on 7-segment display .............................................................................................. 87
5.3.2 Activating condition of protection control code .............................................................................................. 88
5.4 Control and safety devices .................................................................................................................... 93
5.5 Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E .................................. 94
5.5.1 Cooling operation .......................................................................................................................................... 94
5.5.2 Dry operation ................................................................................................................................................. 96
5.5.3 Heating operation .......................................................................................................................................... 98
5.5.4 Defrost operation RAS-3HVRC2 ................................................................................................................. 100
5.5.5 Defrost operation RAS-(4-6)H(V)(R/N)(C/P)2E ........................................................................................... 101
5.6 Standard control functions................................................................................................................... 103
5.6.1 Freezing protection during cooling process or dry operation ...................................................................... 103
5.6.2 Prevention control for excessively high discharge gas temperature ........................................................... 104
6. Optional functions ................................................................................................. 105
6.1 RAS-3HVRC2...................................................................................................................................... 106
6.1.1 Menu mode accessing (by 7-segment display) ........................................................................................... 106
6.1.1.1 Check mode ................................................................................................................................... 106
6.1.1.2 External input and output setting .................................................................................................... 106
6.1.1.3 Function setting .............................................................................................................................. 106
6.1.2 External input and output setting (by 7-segment display) ........................................................................... 107
6.1.2.1 Available control functions .............................................................................................................. 107
6.1.2.2 Setting of external input and output ............................................................................................... 108
6.1.2.3 Optional external output signals ..................................................................................................... 108
6.1.2.4 Available ports ................................................................................................................................ 109
6.1.2.5 Available output signals ...................................................................................................................110
6.1.3 Function setting (by 7-segment display) ......................................................................................................110
6.1.3.1 Sequence of the function setting .....................................................................................................110
6.1.3.2 Function setting ...............................................................................................................................112
6.1.3.3 Circulator function at heating Thermo-OFF (FA) ............................................................................115
6.1.3.4 Night-shift (low noise)(ni) ..............................................................................................................115
v SMGB0136 rev.0 - 07/2021