Electrical Wiring - Hitachi R32/R410A-Serie Installations- Und Betriebshandbuch

ELECTRICAL WIRING

7 ELECTRICAL WIRING
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D A N G E R
• The electrical wiring work must be performed by authorized
installers. If not, it may cause an electric shock or a fire.
• Perform the electrical work according to each regulation of
region and "Installation and Operation Manual ", and the
dedicated electrical circuit must be used. If not performing the
electrical wiring work completely or a capacity shortage of the
power circuit, it will cause an electric shock or a fire.
• Install an ELB (Earth Leakage Breaker: 2/40/30 n/A/mA) and
CB (Circuit Breaker: 5A) in the power source. If not used, it will
cause an electric shock or a fire.
• Turn OFF the main power switch of the indoor unit and the
outdoor unit before an electrical wiring work or a periodical
check is performed. If not, it will cause an electric shock or a fire.
• Protect the wires, drain pipe, electrical parts, etc. from rats
or other small animals. If not protected, rats may gnaw at
unprotected parts and at the worst, a fire will occur.
• Select the wiring size, ELB (Earth Leakage Breaker) and isolating
switch according to each regulation of region and "Installation
& Operation Manual", and the dedicated electrical circuit must
be used.
• Tighten screws according to the following torque.
M3.5: 1.2 N-m
M4: 1.0 to 1.3 N-m
• Connect earth wires for the outdoor / indoor unit to prevent an
electrical shock or an unexpected accident. The earth resistance
must be less than 1 megohm. The earth work must be performed
by authorized installers.
• Pay attention not to bite electrical wirings when attaching the
service cover. It may cause an electrical shock or fire.
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C A U T I O N
• Make sure that the field-selected electrical components (main
power switches, circuit breakers, wires, conduit connectors and wire
terminals) have been properly selected according to the electrical
data given in "Technical Catalog". Make sure that the components
comply with National Electrical Code (NEC).
• Check to ensure that the electrical resistance is more than 1 megohm,
by measuring the resistance between ground and the terminal of the
electrical parts. If not, do not operate the system until the electrical
leakage is found and repaired.
• Do not connect the main power source cables to the control line
(Terminals A, B, 1 and 2 of TB2). If connected, the printed circuit
board (PCB) will be broken.
Power source cable size
EN 60335-1 *1
0.75mm
2
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N O T E
• Follow local codes and regulations when selecting field wires.
• The wire sizes marked with *1 in the above table are selected at the
maximum current of the unit according to the European Standard,
EN 60335-1. Use the wires which are not lighter than the ordinary
tough rubber sheathed flexible cord (code designation 60245 IEC 57)
or ordinary polychloroprene sheathed flexible cord (code designation
60245 IEC 57).
• Use the shielded twisted pair cable for control between the outdoor
unit and the indoor unit, the control cable between indoor units and
the remote control switch cable.
12 PMML0529 rev.1 - 02/2021
Transmitting cable size
EN 60335-1 *1
0.75mm
2
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Harmonics
In relation to IEC 61000-3-2, the situation of harmonics for each
model is as follows:
Situation of the models in relation to IEC
61000- 3-2
Installation restrictions may be applied by
supply authorities in relation to harmonics
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Details of electrical wiring connection
1 Use shielded twisted pair cable for the control cable between
the outdoor unit and the indoor unit, between indoor units.
They are connected to the terminals 1 and 2 of the terminal
boards. The total cable length should be less than 1000m.
2 Use shielded twisted pair cable for the remote control switch
cable. The total cable length should be less than 500m. If the
total length of the cable is less than 30m, other cables can
be used (0.3 to 0.75mm2 ) if comply with local regulations.
The remote control shielded twisted pair cable is connected
to the terminals A and B of each indoor unit terminal board.
3 Check to ensure that the communication cable between
outdoor unit and indoor units (H-Link), comply with Local
regulations and it is not affected by any electromagnetic
noise. It must be a shielded twisted pair cable (≥0.75mm2)
with a total H-Link length <1000m.
4 Control cable: connect the both ends of shielded twisted pair
cable to the earth as shown.
Shielded twisted pair cable
Earth
5 Remote control switch cable: Connect the one end of
shielded twisted pair cable to the earth as shown.
Shielded twisted pair cable
Earth
Model
RPIH-(4.0-6.0)FSRE
Wires
Shield
Earth
Wires
Shield