Hitachi YUTAKI S COMBI Serie Manual De Instrucciones página 39

UNIT INSTALLATION
6.2.2 Removing indoor unit electrical box
!
D A N G E R
• Disconnect the unit from the power supply before touching any
of the parts in order to avoid an electrical shock.
• Do not touch the switch for DHW tank heater operation when
handling the electrical box. Keep the position of this switch in
factory setting position ("Automatic" operation).

Open the electrical box cover
1 Remove the indoor unit front cover.
2 Unscrew the 2 front screws of the electrical box cover and
then, open it.
!
C A U T I O N
Take care with the electrical box components in order to avoid damaging
it.
21 PMML0573 rev.1 - 07/2021
Switch
Indicative
(SW1)
label
6.3 INSTALLATION OF INDOOR UNIT
?
N O T E
Please, try to perform all this procedure following all the steps in the exact
order in which they are presented below.
Installation procedure
1 Space heating pipes connection
2 Drain pipes connection
3 DHW pipes connection
4 Refrigerant piping connection
5 Power and transmission wiring connection
6 Levelling procedure
7 Test and check
6.3.1 Space heating pipes connection
The unit is factory supplied with two shut-down valves to be
connected to the water inlet/outlet pipe. With these shut-down
valves it is very practical to connect the indoor unit to the
heating system by using the factory supplied gaskets just below
the valves (2-3HP: G 1"; 4-6HP: G 1-1/4"). Then, the space
heating installation can be carried out.
Shut-off valves
Gaskets
6.3.2 DHW pipes connection
The connection between the DHW installation and the DHW
connections of the indoor unit must be done taking into account
the following considerations:
1 Install a pressure and temperature relief valve at the DHW
inlet connec tion (as close as possible to the tank) to provide
the following functions.
• Pressure protection
• Non-return function
• Shut-down valve
• Filling
• Draining
If not, an specific device for each function should be installed.
2 Install also a shut-down valve (field supplied) in the DHW
outlet connection, in order to make easier any maintenance
work.
?
N O T E
For more details, refer to the section
(space heating and DHW)".
"7.2.3 Hydraulic circuit checking