Hitachi PC-ARF Technical Catalogue page 394

5 Centralised remote controls
PSC-A64S
System of more than 16 indoor units connected
In this case, the group setting by central station is required. Group setting is for master unit (directly connected to remote
control switch) and slave unit (connected by extension cable).
In case that the remote control switch is not connected, the group setting by remote control switch is not available and
only one master unit is controlled as one group.
In case of up to 16 indoor units connected, the group setting is automatically performed as described in "4.2. System of
less than 16 indoor units connected, Refrigerant system address and indoor unit address". In this case, correct the group
setting by the next procedure.
Refrigerant No. Setting
Indoor Unit RSW Setting
Group Number

Setting of master unit
Indication of master unit setting mode
When the central station is changed to the master unit setting mode, the LCD indication on the central station is as
shown below. The indication of the group to be set is flickered. The refrigerant cycle Nº (hereafter called "Ref. Nº") and
the indoor unit address (hereafter called "I.U. Add.") indicates the address of the indoor unit which is set as the master
unit of the group to be set.
The "" indication of group flickers in case that the master unit of the group is set. When the "SET" indication appears,
the indoor unit indicated on LCD is set as the master unit.
In case that the master unit is not set, "- -" is indicated at Ref. Nº and I.U. Add., and the "SET" indication does not appear.
*When there is one or more group with indoor unit set as master unit in the zone, the zone indication "" turns ON.
Ref. No. of Indoor Unit to be Set
(Can be changed by depressing the "
"1" shows the master
unit setting mode.
Group Nº. to be Set
Zone Nº. to be Set
Condition of master unit setting for each zone:
( is ON: There is any group with the master unit set./
 is OFF: There is no group with the master unit set.)
The above figure shows that the indoor unit of Ref. Nº. "00" and I.U. Add. "02" is set as the master unit for Group 1 of
Zone 1.
378
TCGB0106 rev.0 - 12/2014
Central Station
Master
Slave
1
0
1
∇
" (TEMP) switch.)
Slave
Master
1 2 2
1 0 1
2
When the "SET" indication appears, the
indicated indoor unit is set as the master
unit. (When "SET" does not appear, the
master unit is not set.)
Address of Indoor Unit to be set (can be
changed by depressing the "
switch.)
When the "CHECK" indication appears, the
central station is in the check mode.
Condition of master unit setting for each group:
( is ON: The master unit is set./
 is OFF: The master unit is not set.)
Master Master
Without Remote
Control Switch
3 3
0 1
3 4
∆
" (TEMP)