Hitachi 8E040341, Service Manual

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General Index
SMGB0120 rev.0 - 11/2017 III
General Index
1. General information ................................................................................................... 1
1.1 General notes ..........................................................................................................................................2
1.2 Safety and applied symbols ....................................................................................................................3
1.2.1 Norms and Regulations ................................................................................................................................... 3
1.3 Product guide ..........................................................................................................................................4
1.3.1 Classification of water chiller models .............................................................................................................. 4
1.3.2 Product guide: Water chillers ........................................................................................................................... 4
2. Control Functions ...................................................................................................... 5
2.1 Control functions on the module ..............................................................................................................6
2.1.1 Water control ................................................................................................................................................... 9
2.1.2 Water temperature control ............................................................................................................................. 10
2.1.3 Compressor Control ...................................................................................................................................... 13
2.1.4 Control for recovery from power interruption (Option) ................................................................................... 15
2.1.5 Prevention of simultaneous startup ............................................................................................................... 16
2.1.6 Reverse prevention control ........................................................................................................................... 16
2.1.7 Control for prevention of wrong operation and wrong settings ...................................................................... 17
2.1.8 Demand control ............................................................................................................................................. 17
2.1.9 Forced load up capacity control from external signal .................................................................................... 21
2.1.10 2-temperature setting function ..................................................................................................................... 22
2.1.11 External thermo operation from external contact ......................................................................................... 23
2.1.12 Water Temperature of the Control Target .................................................................................................... 25
2.1.13 Operation from DC24V contact input .......................................................................................................... 26
2.1.14 Thermo OFF function selection ................................................................................................................... 31
2.1.15 Selection of enabling/disabling of alarm release by means of remote stop ................................................ 32
2.1.16 Limitation setting for pump feedback waiting time ....................................................................................... 33
2.1.17 Inlet water temperature thermo OFF function ............................................................................................. 34
2.2 Control of the cooling cycle ...................................................................................................................36
2.2.1 Compressor Control ...................................................................................................................................... 36
2.2.2 Expansion Valve Control ............................................................................................................................... 37
2.2.3 Overcurrent protection control ....................................................................................................................... 39
2.3 Control of Master/Slave group...............................................................................................................40
2.3.1 Summary of control of Master/Slave group ................................................................................................... 40
2.3.2 Setting method .............................................................................................................................................. 40
2.3.3 Operation method .......................................................................................................................................... 41
2.3.4 Other functions of the control of Master/Slave group .................................................................................... 43
2.3.5 Setting items .................................................................................................................................................. 44
2.3.6 Method for setting and confirmation of operation conditions through the LCD screen .................................. 46
2.4 Run operation ........................................................................................................................................48