Hitachi RWM-2.5NE Instruction Manual page 21

ELECTRICAL AND CONTROL SETTINGS
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C A U T I O N
• Ensure specifically that there is an Earth Leakage Breaker (ELB) installed for the units (outdoor and indoor unit).
• If the installation is already equipped with an Earth Leakage Breaker (ELB), ensure that its rated current is large enough to hold the current of the
units (outdoor and indoor unit).
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N O T E
• Electric fuses can be used instead of magnetic Circuit Breakers (CB). In that case, select fuses with similar rated values as the CB.
• The Earth Leakage Breaker (ELB) mentioned on this manual is also commonly known as Residual Current Device (RCD) or Residual Current
Circuit Breaker (RCCB).
• The Circuit Breakers (CB) are also known as Thermal-Magnetic Circuit Breakers or just Magnetic Circuit Breakers (MCB).
5.4 TRANSMISSION WIRING BETWEEN OUTDOOR AND INDOOR UNIT
• The transmission is wired to terminals 1-2.
• The H-LINK II wiring system requires only two transmission cables that connect the indoor unit and the outdoor unit.
• Use twist pair wires (0.75 mm²) for operation wiring between outdoor unit and indoor unit. The wiring must consist of 2-core wires
(Do not use wire with more than 3 cores).
• Use shielded wires for intermediate wiring to protect the units from noise interference, with a length of less than 300 m and a size
in compliance with local codes.
• In the event that a conduit tube for field-wiring is not used, fix rubber bushes to the panel with adhesive.
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C A U T I O N
Ensure that the transmission wiring is not wrongly connected to any live part that could be damaged the PCB.
13 PMML0336B rev.1 - 03/2016
Indoor unit
1 2
Outdoor unit
1 2