Control System - Hitachi RCUE40AG2 Service Manual

Control system

Content
4. Control system ........................................................................................................49
4.1. List of Main Control Function ................................................................................................................ 50
4.2. Water control ........................................................................................................................................ 52
4.2.1. Automatic temperature adjustment .............................................................................................................. 52
4.3. Compressor control ............................................................................................................................. 53
4.3.1. Starting control ............................................................................................................................................. 53
4.3.2. Rotation control ........................................................................................................................................... 53
4.4. Current limit control .............................................................................................................................. 54
4.4.1. 4.4.1. 4.4.1. Actuation of current limiter Actuation of current limiter ........................................................................................................................... Actuation of current limiter ...........................................................................................................................
4.4.2. Standard setting value of unload time .......................................................................................................... 54
4.5. Reverse protection control.................................................................................................................... 55
4.6. Restart control after power failure ........................................................................................................ 56
4.6.1. Restart control after momentary power failure (<2 sec) ............................................................................... 56
4.6.2. Restart function after power failure <Option> (>2 sec) ................................................................................ 56
4.7. Operation error/wrong setting prevention control [40 - 40] ................................................................. 57
4.8. Forced capacity control ........................................................................................................................ 57
4.9. Second water temperature setting........................................................................................................ 58
4.10. Heat storage operation by external order ............................................................................................. 4.10. Heat storage operation by external order 4.10. Heat storage operation by external order .............................................................................................
4.11. Operation by DC24V input (Remote Control) ....................................................................................... 65
4.12. Installation of switch for snow measure (Fan manual operation) ......................................................... 68
4.13. Switch for confi rmation of high pressure cut......................................................................................... 69
4.14 Antifreeze control in winter ................................................................................................................... 4.14 Antifreeze control in winter ................................................................................................................... 4.14 Antifreeze control in winter
4.15. Saving energy priority mode, silence priority mode (night shift), only cooling ...................................... 70
4.16. Defrost (only air-cooled heat pump type) ............................................................................................. 72
4.17. Thermo off selection function ............................................................................................................... 75
4.17.1 Fan Control .................................................................................................................................................... 76
4.17.2 Electronic expansion valve ............................................................................................................................. 78
4.17.3. Protection Controls....................................................................................................................................... 81
pag. 49
SMGB0003 rev.0-01/2007
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