Hitachi RAS-5FSN Installations- Und Betriebshandbuch Seite 28

ELECTRICAL WIRING
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16.4. ELECTRICAL WIRING BETWEEN INDOOR UNIT AND OUTDOOR UNIT
Check to ensure that the terminal for power source wiring
(terminals "L1" to "L1" 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)
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.
Name of Setting
Unit Dip Mark Before
Switch Shipment
ON
Refrigerant
DSW1
Cycle
1 2 3 4
End ON
Terminal DSW10-1P
Resistance
1 2
ON
Refrigerant
DSW5
Cycle
1 2 3 4
0
Indoor Unit
RSW
Address
ATTENTION:
-
Pay attention to the connection of the operating line.
Incorrect connection may cause the failure of PCB.
-
In case that indoor unit quantity is more than 16
(excluding 16), count one outdoor unit as two units.
-
Regarding indoor unit No. From 17 to 32, set the
refrigerant cycle number by adding 1 (one) to the
outdoor unit refrigerant cycle number.
Function
For setting refrigerant cycle
address of outdoor unit. Set the
DSW1 not to overlap the setting
of other outdoor units in the
same H-LINK system
For matching impedance of
transmission circuit. Set the
DSW10 according to the
quantity of outdoor units in the
H-LINK system. Setting of End
Terminal Resistance.
Before shipment, No. 1 pin of
DSW10 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 DSW10 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.)