Hitachi YUTAKI S80 R410A Series Installation And Operation Manual page 9

6.3.2 LED indication ........................................................................................53
6.4 Terminal board connections ............................................................................53
6.4.1 Table board 1 .........................................................................................53
6.4.2 Table board 2 .........................................................................................54
6.4.2.1 Indoor/outdoor communication wiring (TB2) / ATW-RTU
6.4.2.2 Input terminals (Default input functions) ................................58
7. Maintenance .............................................................................................................67
7.1 Removing the covers .......................................................................................68
7.1.0.1 Removing the indoor unit covers .............................................68
7.1.0.2 Removing indoor unit electrical box ........................................71
7.1.1 Space heating pipes connection ...........................................................73
7.1.2 Drain pipes connection ..........................................................................73
7.1.3 Test and check .......................................................................................74
8. Commissioning .........................................................................................................75
8.1 Before operation ..............................................................................................76
8.2 Preliminary check ............................................................................................76
8.2.1 Checking the unit ...................................................................................76
8.2.2 Electrical checking .................................................................................77
8.2.3 Hydraulic circuit checking (space heating and DHW) ...........................77
8.2.4 Checking the refrigerant circuit .............................................................78
8.3 Commissioning procedure ..............................................................................78
8.4 Test run / air purge ..........................................................................................79
PMEN0648 rev.0 - 03/2023
Communication / Central Devices Communication .......... ......57
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