Hitachi PSC-A64S - Operation; Group Setting

Split the central control power supply line from the main power supply line using a junction box, as shown in the following
diagram:
220 VAC or 240 VAC
Junction box
To the outdoor unit or
disjunctor
Central remote control Indoor unit
CAUTION
• Before installing the wiring, switch off the power supply to the air conditioning system and central control unit. Installing the wiring while
the central control power supply is switched on may cause the central control unit to malfunction.
• Check to ensure that the wiring is correct. Incorrect wiring may cause malfunction of the central station.
• DO NOT run all the transmission cable for the central station along the power line and other transmission cables, or malfunction may
occur due to the noise, etc. If the transmission cable for the central station is required to be run along the power line and other trans-
mission cables, separate the cable more than 30 cm away from other cables, or run the cable through a metal tube and earth the tube.
• In case of applying high voltage to the TB2, the fuse on the PCB is blown out.
In such a case, rstly correct the wiring to TB1, and then set Nº.2 pin ON.
DSW3
(Fuse Recover)
5.3.4 Operation
5.3.4.1 Group setting

Group and zone concept
• Group: Minimum unit for operation of Central Station. One remote control switch group is considered as one group
under the same control. The Central Station can control up to 64 groups (4 zones x 16 groups).
• Zone: Operation unit with Plural Groups. Up to 16 groups as maximum can be set in one zone. The central station
can control up to 4 zones.
• Remote control switch group: Unit of plural indoor units (max. 16 units). Connected with Transmission Line of Remote
Control Switch. In this group the indoor units are under the same control setting.
Central station
Group Group
Zone
One remote control switch
group is considered as one
group
The remote control switch
group with one indoor unit
is also considered as one
group
As for the indoor unit without
remote control switch, one
indoor unit is considered as
one group.
Group Group Group Group
Outdoor unit
Indoor unit
Remote
Control Switch
CAUTION
When setting the remote control switch group without transmission line between indoor units, the indoor unit connected with the remote
control switch shall be set as master unit. If the setting of the master unit is wrong, the group can not be controlled with the central station.
5 Centralised remote controls
PSC-A64S
TCGB0106 rev.0 - 12/2014
375
5