Chapter 5 Control - Mitsubishi Electric PURY-HP72 Service Handbook

Chapter 5 Control
5-1 Dipswitch Functions and Factory Settings .................................................................................... 117
5-1-1 Outdoor Unit Switch Functions and Factory Settings ......................................................................... 117
5-1-2 Indoor Unit Switch Functions and Factory Settings ............................................................................ 121
5-1-3 Remote Controller Switch Functions and Factory Settings................................................................. 122
5-1-4 BC Controller Switch Settings............................................................................................................. 123
5-2 Outdoor Unit Control ........................................................................................................................ 124
5-2-1 Overview ............................................................................................................................................. 124
5-2-2 Rotation Control .................................................................................................................................. 124
5-2-3 Initial Control ....................................................................................................................................... 124
5-2-4 Startup Control.................................................................................................................................... 124
5-2-5 Refrigerant Bypass Control................................................................................................................. 125
5-2-6 Frequency Control .............................................................................................................................. 126
5-2-7 Defrost Operation Control ................................................................................................................... 127
5-2-8 ON-defrost operation control............................................................................................................... 129
5-2-9 Refrigerant Recovery Control ............................................................................................................. 129
5-2-10 Oil recovery during compressor operation at low frequency............................................................... 130
5-2-11 Outdoor Unit Fan Control.................................................................................................................... 130
5-2-12 Compressor discharge superheat control (expansion valve <LEV4>)................................................ 131
5-2-13 Evaporation Temperature Control (Expansion Valves <LEV5a>)....................................................... 131
5-2-14 Control at Initial Startup ...................................................................................................................... 131
5-2-15 Emergency Operation Mode ............................................................................................................... 133
5-2-16 Unit Control Scheme........................................................................................................................... 135
5-2-17 Refrigerant Circuits and Refrigerant Cycle Diagrams ......................................................................... 136
5-2-18 Operation Mode .................................................................................................................................. 137
5-2-19 Demand Control.................................................................................................................................. 138
5-3 BC Controller Control....................................................................................................................... 139
5-4 Operation Flowcharts ....................................................................................................................... 140
5-4-1 Operation Sequence Flowchart .......................................................................................................... 140
5-4-2 Actions Performed in Different Modes ................................................................................................ 143
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