Hitachi YUTAKI RWM-2R1E - Page 9

GENERAL INDEX
PMML0575 rev.2 - 03/2022
IX
6.4 R410A Refrigerant circuit ..................................................................................................................................... 53
6.4.1 Refrigerant piping ........................................................................................................................................................... 53
6.4.2 Precautions in the event of gas refrigerant leaks ........................................................................................................... 54
6.5 Water piping ......................................................................................................................................................... 56
6.5.1 Water piping length......................................................................................................................................................... 56
6.5.2 Water piping size ............................................................................................................................................................ 56
6.5.3 Water quality................................................................................................................................................................... 59
6.5.4 Requirements and recommendations for the hydraulic circuit ....................................................................................... 61
6.5.5 Water ow control ........................................................................................................................................................... 61
6.6 water piping connection FOR YUTAKI M ............................................................................................................. 62
6.6.1 Piping Location And Connection Size ............................................................................................................................ 62
6.6.2 Suspension Of Water Piping .......................................................................................................................................... 62
6.7 Space heating and DHW ...................................................................................................................................... 63
6.7.1 YUTAKI S AND YUTAKI M ............................................................................................................................................. 63
6.7.2 YUTAKI S COMBI........................................................................................................................................................... 66
6.7.3 YUTAKI S80 ................................................................................................................................................................... 69
7 ELECTRICAL AND CONTROL SETTINGS ................................................................................72
7.1 General check ...................................................................................................................................................... 72
7.2 Electrical connection ............................................................................................................................................ 76
7.2.1 Wiring size ...................................................................................................................................................................... 76
7.2.2 Minimum requirements of the protection devices ........................................................................................................... 80
7.3 Setting of DIP switches and RSW switches ......................................................................................................... 84
7.3.1 Outdoor unit RAS-(2-3)WHVRP1, RAS-(4-10)WH(V)NPE and RASM-(2-6)(V)(N/R)E .................................................. 84
7.3.2 Indoor units RWM-(2.0-10.0)(R/N)1E / RWD-(2.0-6.0)(R/N)W1E-220S(-K) and RWH-(4.0-6.0)(V)NF(W)E ................. 88
7.3.3 YUTAKI CASCADE CONTROLLER ATW-YCC-(01-03) ................................................................................................. 93
7.3.4 Location of DIP switches and rotary switches ................................................................................................................ 93
7.4 Terminal board connections ................................................................................................................................. 98
7.4.1 Table board 1 .................................................................................................................................................................. 98
7.4.2 Table board 2 for YUTAKI M and YUTAKI S80 ............................................................................................................... 99
7.4.3 Table board 2 for YUTAKI S and YUTAKI S COMBI......................................................................................................110
8 UNIT CONTROLLER (PC-ARFH1E) ........................................................................................125
8.1 Denition of the switches.................................................................................................................................... 125
8.2 Description of the icons ...................................................................................................................................... 126
8.2.1 Common icons ............................................................................................................................................................. 126
8.2.2 Icons for the comprehensive view ................................................................................................................................ 127
8.2.3 Icons for the room thermostat view .............................................................................................................................. 128
8.3 Room thermostat contents ................................................................................................................................. 129