Water Pipes Connection To The Dhw Installation (Dhw Pipes); Power Wiring Connection; Tank Wiring Connections - Hitachi YUTAKI S80 Series Installation And Operation Manual

INSTALLATION
2 Align the front side of the tank with the front side of the indoor
unit.
7.5.10 Water pipes connection to the DHW
installation (DHW pipes)
The two flexible water pipes which had been connected to the
tank (DHW inlet and outlet connections) must be connected to
the DHW installation.
I M P O R TA N T N O T E
• 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 specific device for each function should be installed.
• Install also a shut-off valve (field supplied) in the DHW outlet
connection, in order to make easier any maintenance work.
For more details, refer to the section

7.5.11 Power wiring connection

Follow the same procedure explained in
on the
alone (Without tank)
and operation manual.
N O T E
Check the requirements and recommendations in the chapter
Electrical Wiring.
D A N G E R
• Do not connect the power supply to the indoor unit and
DHW tank prior to filling both circuits with water and
checking water pressure and the total absence of any wa-
ter leakage.
• Do not connect or adjust any wiring or connections un-
less the main power switch is OFF.
• When using more than one power source, check and en-
sure that all of them are turned OFF before operating the
indoor unit.
44
(Top view)
DHW hydraulic circuit.
Installation of indoor unit
YUTAKI S80 indoor unit Installation
PMML0291A rev.2 - 09/2014
• Wait for 3 minutes after switching off the power of the
unit before any electrical work. This is necessary to en-
sure the discharge of internal capacitors in order to avoid
electrical shock.
• Avoid wiring installation in contact with the refrigerant
pipes, water pipes, edges of plates and electrical com-
ponents inside the unit to prevent damage, which may
cause electric shock or short circuit.
C A U T I O N
• Make sure that all wiring and protection devices are properly
selected, connected, identified and fixed to the correspond-
ing terminals of the unit, specially the protection (earth) and
power wiring, taking into account the applicable national and
local regulations.
• Protect the DHW tank against the entry of small animals (like
rodents) which could damage the drain pipe and any internal
wire or any other electrical part, leading to electric shock or
short-circuit.

7.5.12 Tank wiring connections


Cables identification
Factory supplied cables
The three electrical wires are already connected to the DHW tank.
They are located at the bottom front side of the tank fastened
with clamps. The LCD electrical cable at the right and the electric
heater and thermistor cables at left.
Location of the electric heater
and thermistor cables
Electric heater cable
Thermistor cable
LCD controller cable
Location of the
LCD cable
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