Hitachi YUTAKI S80 Series - Power Wiring Connection; Tank Wiring Connection

35
PMML0291A rev.2 - 09/2014
INSTALLATION
ENGLISH
7.4.11 Power wiring connection
Follow the same procedure explained in Installation of indoor unit
alone (Without tank) on the YUTAKI S80 indoor unit Installation
and operation manual.
NOTE
Check the requirements and recommendations in the chapter
Electrical Wiring.
DANGER
• Do not connect the power supply to the indoor unit and
DHW tank prior to lling 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.
• 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.
CAUTION
• Make sure that all wiring and protection devices are properly
selected, connected, identied and xed 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.
7.4.12 Tank wiring connection
The three electrical wires are already connected to the DHW tank.
They will be 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
LCD cable
Location of the electric heater
and thermistor cables

Electric heater of the tank
The Electrical heater cable is the labelled one with the TB2 and
24/25/14 connectors legend.
24
25
14
}
1 Take this electrical cable, pass it behind the partition plate and
wire the cable to the two clamps located at the left side and
upper part of the indoor unit.
Clamps
(Front view)
2 Take the cable to the Electrical Box 1 and pass it through one
of the upper holes. Connect the earth wire to the 14th terminal
and the other two wires to the 24 and 25 connections of the
Terminal Board 2.
Holes to the TB2
NOTE
• Do not touch the Manual safety reset of the electrical heater.
• Do not touch the temperature regulator unless the tank is
working in “emergency” operation due to indoor unit or out-
door unit malfunction. In this case, refer to the section DHW
tank electric heater “emergency” operation.
Heater’s
thermostat
Tank
thermistor
Manual safety reset
(Heater’s thermostat)
85ºC
Temperature
regulation knob
Lamp con-
nectors