Hitachi YUTAKI H Combi HWD-WE-220S, Installation & Operation Manual, Page: 9 / 122

IX PMML0600 rev.0 - 06/2022
I
Gener
al Index
7.1 Before operation .........................................................................................................98
7.2 Preliminary check .......................................................................................................98
7.2.1 Checking the unit .............................................................................................98
7.2.2 Electrical checking ...........................................................................................98
7.2.3 Hydraulic circuit checking (space heating and DHW) ...............................99
7.2.4 Checking the refrigerant circuit .....................................................................99
7.2.5 Test and check ................................................................................................100
7.3 Commissioning procedure .....................................................................................100
7.4 Test run / air purge ...................................................................................................101
8. Maintenance ....................................................................................................................... 104
8.1 YUTAKI M R32 and YUTAKI Hydrosplit R32 ...........................................................105
8.1.1 RASM-(2-3)VRE ................................................................................................105
8.1.1.1 Removing the service cover ........................................................105
8.1.1.2 Removing the upper cover ..........................................................106
8.1.1.3 Removing the front cover ............................................................107
8.1.1.4 Removing the rear cover ..............................................................107
8.1.2 RASM-(4-7)(V)R(W)1E .....................................................................................109
8.1.2.1 Removing the service cover ........................................................109
8.1.2.2 Removing the upper cover ..........................................................110
8.1.2.3 Removing the rear cover ..............................................................111
8.2 YUTAKI H .....................................................................................................................112
8.2.1 Removing the indoor unit service cover ....................................................112
8.2.2 Removing indoor unit electrical box ..........................................................113
8.2.3 Space heating pipes connection ................................................................114
8.2.3.1 Drain pipes connection ................................................................114
8.2.4 Cover assembly ..............................................................................................115