Hitachi HRNM Serie Installations- Und Betriebshandbuch Seite 43

15.4. ELECTRICAL WIRING BETWEEN INDOOR UNIT AND OUTDOOR UNIT
Connect the electrical wires between the indoor unit and
the outdoor unit, as shown below.
Check to ensure that the terminal for power source wiring
(terminals "L1" to "L1", "L2" to "L2", "L3" to "L3" and "N" to
"N" of each terminal board: AC380-415V), and
intermediate wires (Operating Line: terminals "1" to "1" and
"2" to "2" of each terminal board: DC5V) between the
indoor unit and the outdoor unit coincide correctly. If not,
some component will be damaged.
Follow local codes and regulations when performing
electrical wiring.
Connect the operation wiring to the units in the same
refrigerant cycle (The refrigerant piping and the control
wiring should be connected to the same indoor units). If the
refrigerant piping and the control wiring are connected to
the units in the different refrigerant cycle, it may cause a
abnormal operation.
Use twisted shielded pair wiring for operation wiring
between outdoor unit and indoor unit, and also for
operation wiring between indoor units (H-Link connection)
Unit Name of Dip Switch
Refrigerant Cycle
End Terminal Resistance
Refrigerant Cycle
Indoor Unit Address
It can be also used Shielded pair wiring.
Shield shall be connected to earth only in one cable side.
Do not use more than 3 cores for operation wiring (-H-
Link). Core sizes must be selected according to the
national regulations.
Connect the operating line for the units in the same
refrigerant cycle (The refrigerant line shall be connected to
the indoor units with the refrigerant piping connected to the
same outdoor unit). In the case that each of the refrigerant
piping and the operating line is connected to the units of
different cycle, it may cause an abnormal operation.
Open a hole near the connection hole of power source
wiring when multiple outdoor units are connected from one
power source line.
The recommended breaker sizes are shown in Table of
electrical data and recommended Wiring, Breaker Size/1
O.U.
In the case that a conduit tube for field-wiring is not used,
fix rubber bushes with adhesive on the panel.
All the field wiring and equipment must comply with local
and international codes.
Mark Setting Before Shipment
ON
DSW4
1 2 3 4 5 6
&
0
RSW1
ON
DSW5
1 2
ON
DSW5
1 2 3 4
0
RSW
ELECTRICAL WIRING
Function
For setting refrigerant cycle address of outdoor
unit. Set the DSW4 and RSW1 not to overlap
the setting of other outdoor units in the same H-
LINK system
For matching impedance of transmission circuit.
Set the DSW5 according to the quantity of
outdoor units in the H-LINK system. Setting of
End Terminal Resistance.
Before shipment, No. 1 pin of DSW5 is set at the
"ON" side.
In the case that the outdoor units quantity in the
same H-link is 2 or more, set No. 1 pin of DSW5
at the "OFF" side from the 2nd unit. If only one
outdoor unit is used, no setting is required.
For setting refrigerant cycle address of indoor
unit. Set the DSW5 corresponding to the
address of outdoor unit in the same refrigerant
cycle.
For setting indoor unit address. Set the RSW not
to overlap the setting of other indoor units in the
same refrigerant cycle. (If not set, the automatic
address function is perfomed.)
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