Hitachi YUTAKI H Combi HWD-WE-220S Manual De Instrucciones página 15

UNIT INSTALLATION
5.1.4 Indoor unit main parts (Descriptions)
Nº Part
Indoor unit
1
front cover
Indoor unit left
2
2
cover
Indoor unit
3
1
right cover
Unit controller
4
frame
5 Unit controller
Piping
6
connections
5.2 Installation of Indoor unit

NOTE
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. Water piping connection
5. Power and transmission wiring connection
6. Levelling procedure
7. Test and check
5.2.1 Power and transmission wiring
connection
◆ Safety instructions

NOTE
Check the requirements and recommendations in this chapter
"4. Electrical and control settings".
!
DANGER
• Do not connect the power supply to the indoor unit prior to
filling the space heating and DHW circuits with water and
checking water pressure and the total absence of any water
leakage.
PMML0596 rev.0 - 04/2022
• Do not connect or adjust any wiring or connections unless the
main power switch is OFF.
• When using more than one power source, check and ensure
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that all of them are turned OFF before operating the indoor
unit.
• Avoid wiring installation in contact with the water pipes,
edges of plates and electrical components inside the unit to
prevent damage, which may cause electric shock or short
5
circuit.
!
4
• Use a dedicated power circuit for the indoor unit. Do not use
a power circuit shared with the outdoor unit or any other
appliance.
• Make sure that all wiring and protection devices are properly
3
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. Establish proper earthing; Incomplete earthing may
cause electrical shock.
• Protect the indoor unit 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.
• Keep a distance between each wiring terminal and attach
insulation tape or sleeve as shown in the figure.
◆ Connection procedure
Access to the electrical box before performing the next
steps:
1. Using the appropriate cable, connect the power
circuit to the appropriate terminals as shown on the
wiring label and the illustration below. Connect the
power supply cables to the terminal board (TB1) ,
and the earth conductor to the earth screw in the
electrical box plate.
CAUTION
Tape or sleeve
TERMINAL BOARD 1 (TB1)
Power
terminals
Earth
terminal
EN
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