Hitachi RAS-(4-12)HNP(1)(E) - 5 Control System

5 Control System
135
SMGB0087 rev.0 - 12/2013
5
Index
5.1. Device control system .........................................................................................................................136
5.2. Outdoor units PCB ..............................................................................................................................138
5.2.1. RAS-(2-2.5)HVNP1 / RAS-3HVNC1 ........................................................................................................ 138
5.2.2. RAS-3HVNP1E ........................................................................................................................................ 139
5.2.3. RAS-(4-6)H(V)NP1E ................................................................................................................................ 140
5.2.4. RAS-(4-6)H(V)NC1E ............................................................................................................................... 141
5.2.5. RAS-(8-10)HN(P/C)E .............................................................................................................................. 142
5.2.6. RAS-12HN(P/C) ...................................................................................................................................... 143
5.3. Protection and safety control ...............................................................................................................144
5.4. Standard operation sequence .............................................................................................................145
5.4.1. Cooling operation .................................................................................................................................... 145
5.4.2. Dry operation ........................................................................................................................................... 147
5.4.3. Heating operation .................................................................................................................................... 149
5.4.4. Automatic cooling and heating operation ................................................................................................ 151
5.4.5. Defrost operation control ......................................................................................................................... 152
5.5. Standard control functions...................................................................................................................155
5.5.1. Freezing protection during cooling process or dry operation ................................................................... 155
5.5.2. Prevention control for high pressure increase during cooling operation .................................................. 156
5.5.3. Prevention control for excessively high discharge gas temperature ....................................................... 157
5.5.4. Activation for protection device control .................................................................................................... 158
5.5.5. Preheating control of compressor ............................................................................................................ 159
5.5.6. Prevention control for high pressure increase ......................................................................................... 160
5 . C o n t r o l S y s t e m