Hitachi FS3 Series, Service Manual

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28
OPTIONAL FUNCTION
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.
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:
Œ
Do not set the same indoor unit number in the same
refrigeration cycle.
If the same number exists, an alarm code of 35
appears.
Œ
Do not set the same indoor unit number in the main
indoor units.
Always start from No.1 for the main indoor units.
Œ
Do not use No.0 setting for the first main indoor unit.
Start Here (Group 1)
Start Here (Group 2)
Start Here (Group 3)
Unit nº 0 Unit nº 1 Unit nº 2 Unit nº 3 Unit nº 4 Unit nº 5 Unit nº 6 Unit nº 7
Unit nº 8 Unit nº 9 Unit nº 10 Unit nº 11 Unit nº 12 Unit nº 13 Unit nº 14 Unit nº 15
“
go to unit 8
“
go to unit 0
. . . .
Remote Control Switch (3 Wires)
Group 1
Group 2
Group 3
Main Unit of
Group 1
Branch Unit Branch Unit
Branch Unit Branch Unit
Branch Unit Branch Unit
Main Unit of
Group 2
Main Unit of
Group 16
DSW1
Central
Station
(PSC-3S1)
Connector
Number
Control
Cable
(2 Wires)
Nº 1 Nº 2 Nº 0
Nº 2 Nº 3 Nº 1
Nº 0 Nº 1 Nº 15