Hitachi YUTAKI S80 Series - Installation of Indoor Unit with HITACHI Tank (Tank Integrated over the Indoor Unit); Water Pipes Connection to the Indoor Unit (Space Heating Pipes); Drain Pipes Connection; Water Pipes Connection to the Indoor Unit (Heating Coil Pipes)

28 PMML0291A rev.2 - 09/2014
INSTALLATION
7.4 INSTALLATION OF INDOOR UNIT WITH HITACHI TANK (TANK INTEGRATED OVER THE
INDOOR UNIT)
NOTE
Please, try to perform all this procedure following all the steps in the exact order which they are presented below.
Installation procedure
1 Water pipes connection to the indoor unit (Space heating
pipes).
2 Drain pipes connection.
3 Water pipes connection to the indoor unit (heating coil pipes).
4 Refrigerant piping connection and indoor unit’s placing.
5 Water pipes connection to the space heating (Space heating
pipes).
6 Water pipes connection to the tank (DHW pipes).
7 Removing the mounting foot.
8 Tank over the indoor unit assembly.
9 Water pipes connection to the tank (heating coil pipes).
10 Water pipes connection to the DHW installation (DHW pipes).
11 Power wiring connection.
12 Tank wiring connection.
13 Levelling procedure.
14 Tank’s xation to the wall.
15 Test and check.
16 Cover’s assembly.
7.4.1 Water pipes connection to the indoor unit (Space heating pipes)
Follow the same procedure explained in Installation of indoor unit alone (Without tank) on the YUTAKI S80 indoor unit Installation and
operation manual.
7.4.2 Drain pipes connection
Follow the same procedure explained in Installation of indoor unit alone (Without tank) on the YUTAKI S80 indoor unit Installation and
operation manual.
7.4.3 Water pipes connection to the indoor unit (Heating coil pipes)

Flexible water pipes identication
The DHW tank is factory supplied with four water pipes: two water pipes (heating coil pipes) to connect with the indoor unit (to the T-
branch and to the 3-way valve) and other two (DHW pipes) for connection with the DHW tank. It is necessary to identify which are the
two pipes for connection to the indoor unit and which are the other two pipes for connection to the DHW tank.
Factory-supplied
with the indoor unit
Heating coil pipes
Item Connection
365mm
960mm
Ø19.05
(3/4”)
Heating coil inlet pipe
For the connection between the 3-way valve water outlet and the heating
coil inlet.
Heating coil outlet pipe
For the connection between the T-branch water inlet and the heating coil
outlet.
DHW pipes
Item Connection
Ø19.05
(3/4”)
960mm
1045mm
DHW inlet pipe
For the connection between the DHW inlet connection (cold water to the
tank) and the DHW installation.
DHW outlet pipe
For the connection between the DHW outlet connection (hot water from
the tank) and the DHW installation.