Hitachi FSG Series, Technical Catalogue

Page: 339 / 424

ELECTRICAL WIRING
15
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15.4 COMMON WIRING
15.4.1 ELECTRICAL WIRING BETWEEN INDOOR
UNIT AND OUTDOOR UNIT
&
CAUTION:
– Use twisted shielded pair cable or shielded pair cable
for transmission wires between the indoor and the
outdoor units, and connect the shielded part to the
earth screw in the electrical box of the indoor unit as
shown below.
– Connect the electrical cables between the indoor unit
and the outdoor unit, as shown in the wiring diagram.
– 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 in case of AC 380-
415V, and "L1" to "L1" and "N" to "N" of each AC 220 -
240V) intermediate wires (Operating Line: terminals “1
and 2” to “1 and 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 cable or shielded pair cable
(more than 0.75 mm²) between outdoor unit and
indoor unit, and also for operation wiring between
indoor unit and indoor unit (H-Link connection).
– Shield must 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 must 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.
Unit
Name of Dip
Switch
Mark
Setting Before
Shipment
Function
Refrigerant
Cycle
DSW1
ON
1 2 3 4
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
Outd
oor Unit
End
Terminal
Resistance
DSW10-1P
ON
1 2
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.
Refrigerant
Cycle
DSW5
ON
1 2 3 4
For setting refrigerant cycle
address of indoor unit. Set the
DSW5 corresponding to the
address of outdoor unit in the
same refrigerant cycle.
Indo
or
U
n
it
Indoor Unit
Address
RSW
0
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.)
$
ATTENTION:
Pay attention to the connection of the operating line.
Incorrect connection may cause the failure of PCB.
Transmission
Wires
Power Supply
Wires
Shield Part
Earth Screw