Hitachi RCME-AH1, Service Manual

Page: 15 / 174

2. Control Functions
SMGB0082 rev.1 - 07/2015
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2
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C o n t r o l F u n c t i o n s
Index
2.1 Control functions on the module..............................................................................................................8
2.1.1 Water control ..................................................................................................................................................11
2.1.2 Water temperature control ............................................................................................................................. 12
2.1.3 Compressor Control ...................................................................................................................................... 15
2.1.4 Control for recovery from power interruption (Option) ................................................................................... 17
2.1.5 Prevention of simultaneous startup ............................................................................................................... 18
2.1.6 Reverse prevention control ........................................................................................................................... 18
2.1.7 Anti-Freezing Control for Winter .................................................................................................................... 19
2.1.8 Control for prevention of wrong operation and wrong settings ...................................................................... 22
2.1.9 Demand control ............................................................................................................................................. 22
2.1.10 Forced load up capacity control from external signal .................................................................................. 25
2.1.11 2-temperature setting function ..................................................................................................................... 26
2.1.12 External thermo operation from external contact ........................................................................................ 27
2.1.13 Water Temperature of the Control Target .................................................................................................... 29
2.1.14 Operation from DC24V contact input .......................................................................................................... 30
2.1.15 Attachment of snowfall switch (Forced fan operation) ................................................................................. 35
2.1.16 Silence priority mode (Night shift) (Only in cooling operation) .................................................................... 36
2.1.17 Thermo OFF function selection ................................................................................................................... 37
2.1.18 Selection of enabling/disabling of alarm release by means of remote stop ................................................ 38
2.1.19 Limitation setting for pump feedback waiting time ....................................................................................... 39
2.1.20 Inlet water temperature thermo OFF function ............................................................................................. 40
2.1.21 Intermitent fan operation ............................................................................................................................. 41
2.1.22 Switch for confirmation of high pressure cut. (Cooling operation). .............................................................. 42
2.1.23 Switch for confirmation of low pressure cut. (Cooling operation). ............................................................... 43
2.1.24 Switch for confirmation of low pressure cut. (Heating operation) ................................................................ 43
2.2 Control of the cooling cycle ...................................................................................................................44
2.2.1 Compressor Control ...................................................................................................................................... 44
2.2.2 Fan Control .................................................................................................................................................... 45
2.2.3 Expansion Valve Control ............................................................................................................................... 46
2.2.4 Overcurrent protection control ....................................................................................................................... 48
2.2.5 Defrosting (only for air-cooled heat pump systems (RHME)) ........................................................................ 49
2.3 Control of Master/Slave group ...............................................................................................................52
2.3.1 Summary of control of Master/Slave group ................................................................................................... 52
2.3.2 Setting method .............................................................................................................................................. 52
2.3.3 Operation method .......................................................................................................................................... 53
2.3.4 Other functions of the control of Master/Slave group .................................................................................... 56
2.3.5 Setting items .................................................................................................................................................. 58
2.3.6 Method for setting and confirmation of operation conditions through the LCD screen .................................. 59
2.4 Run operation ........................................................................................................................................61
2.4.1 Setting of switches on the setting PCB ......................................................................................................... 61
2.4.2 Operation control of the module .................................................................................................................... 62
2.5 Time chart .............................................................................................................................................63