Hitachi YUTAKI S80 Series - Water Pipes Connection to the Tank (Heating Coil Pipes); Water Pipes Connection to the DHW Installation (DHW Pipes)

34 PMML0291A rev.2 - 09/2014
INSTALLATION
CAUTION
• The tank’s weight is very high; therefore use at least two peo-
ple when lifting it.
• Take care with the connected exible water pipes (both in-
door unit and tank connections) when placing the tank over
the unit.
3 Fix the 4 bolts (factory supplied) between the indoor unit and
tank (2 screws accessing from left side and the other 2 ac-
cessing from right side).
(Left side)
(Right side)
(x4)
7.4.9 Water pipes connection to the tank
(heating coil pipes)
Perform the exible water pipes connection between indoor unit
and domestic hot water tank (Tank connections) as follows:

Connection procedure
The two heating coil pipes which had been connected to the in-
door unit must be connected to the tank:
1 The pipe connected to the 3-way valve must be connected to
the heating coil inlet connection of the tank.
2 The pipe connected to the T-branch must be connected to the
heating coil outlet connection of the tank.
1)
2)
(Left side view)
7.4.10 Water pipes connection to the DHW
installation (DHW pipes)
The two exible water pipes which had been connected to the
tank (DHW inlet and outlet connections) must be connected to
the DHW installation.
IMPORTANT NOTE
• Do not forget installing the pressure and temperature relief
valve accessory (DHWT-SWG-01) at the DHW inlet connec-
tion of the tank (as close as possible to the tank) to provide
the following functions.
- Pressure protection
- Non-return function
- Shut-off valve
- Filling
- Draining
If not, an specic device for each function should be installed.
• Install also a shut-off valve (eld supplied) in the DHW outlet
connection, in order to make easier any maintenance work.
For more details, refer to the section DHW hydraulic circuit.