Hitachi FSG Series Service Manual page 228

4
OPTIONAL FUNCTION
28
n System of more than 16 units
Layout and Electrical Wiring
In the case that more than 16 indoor units including 16 units
up to 256 units are controlled by the Central Station, 16
groups as a maximum can be controlled by this Central
Station and each group can consist of 16 units as a
maximum.
The ON/OFF control of each group is available.
Furthermore, the operation status of all indoor units can be
monitored by the Central Station.
Remote Control Switch (3 Wires)
Main Unit of
Group 1
Nº 1
Central
Station
(PSC-3S1)
Connector
Number
DSW1
Main Unit of
Control
Group 2
Cable
(2 Wires)
Nº 2
Main Unit of
Group 16
Nº 0
Unit nº 0
Unit nº 8
Branch Unit Branch Unit
Nº 2 Nº 0
Branch Unit Branch Unit
Nº 3 Nº 1
Branch Unit Branch Unit
Nº 1 Nº 15
Start Here (Group 1)
Start Here (Group 2)
Unit nº 1 Unit nº 2 Unit nº 3
Unit nº 9 Unit nº 10 Unit nº 11
n Setting of Rotary Switches
Set the number by using the rotary switch, DSW1 on the PCB
in the indoor units. Firstly set the unit number for the main
unit in group 1 and secondly set the unit numbers for the
branch units one by one according to the figure below. Next,
set the unit number for the main unit in group 2 and set the
unit numbers for the branch units one by one. However,
please note that the unit number for the main unit in group 2
should be set from the next number as shown below. Repeat
this work for the remaining units.
WARNING:
ΠDo not set the same indoor unit number in the same
refrigeration cycle.
If the same number exists, an alarm code of 35
appears.
ΠDo not set the same indoor unit number in the main
indoor units.
Always start from No.1 for the main indoor units.
ΠDo not use No.0 setting for the first main indoor unit.
Start Here (Group 3)
. . . .
Unit nº 4 Unit nº 5
Unit nº 12 Unit nº 13
Unit nº 6 Unit nº 7
“ go to unit 8
Unit nº 14 Unit nº 15
“ go to unit 0