Power And Transmission Wiring Connection - Hitachi YUTAKI S COMBI Series Instruction Manual

UNIT INSTALLATION

6.3.5 Power and transmission wiring connection

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Safety instructions
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N O T E
Check the requirements and recommendations in the chapter
ELECTRICAL AND CONTROL SETTINGS"
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D A N G E R
• 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.
• 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 that
all of them are turned OFF before operating the indoor unit.
• Avoid wiring installation in contact with the refrigerant pipes,
water pipes, edges of plates and electrical components inside
the unit to prevent damage, which may cause electric shock or
short circuit.
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C A U T I O N
• 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 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.
Tape or sleeve
26 PMML0338B rev.1 - 03/2016
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Connection procedure
Access to the electrical box before performing the next steps:
1 Using the appropriate cable, connect the power circuit to the
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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.
TERMINAL BOARD 1 (TB1)
Power terminals
Case 1. Power supply:
1~ 230V 50Hz
2 Connect the transmission wires between outdoor and indoor
unit to the terminals 1 and 2 on the terminal board 2 (TB2).
1
1
3 Carry out the necessary electrical connections of the optional
accessories using the terminal board 2 (TB2). Consult its
label for a better understanding.
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N O T E
Refer to the section "5.5 Optional indoor unit wiring
4 Pass the electrical wiring from the TB1 and TB2 to the lateral
holes of the electrical box. Then, fix the cables to the cord
bands located at the right side. Afterwards, route the cables
through the back side of the user controller plate, and fix
the them with the two clamps located at the top right side.
Finally, take the cables out through the electrical wiring holes
of the top rear side of the indoor unit.
Earth terminal
Power terminals
Case 2. Power supply:
3N~ 400V 50Hz
Indoor unit
2
Outdoor unit
2
(accessories)".