Hitachi CENTRAL STATION PSC-A32MN Installations- Und Betriebshandbuch Seite 25

Operation
5.1.7 Group register
Register the connected indoor units to groups and blocks of the central station.
5.1.7.1 Definitions
• Group: The minimum operation unit controlled by one central station. 1 remote control group is considered as 1 group, and the
same setting is applied to the entire group. A maximum of 32 groups (organized as 4 blocks with 8 groups each, 8 blocks with 4
groups each, 2 blocks with 16 groups each or 16 blocks with 2 groups each) can be controlled with one central station.
• Block: An operation unit composed of several groups. The central station organizes blocks in patterns of 4 blocks with 8 groups
each, 8 blocks with 4 groups each, 2 blocks with 16 groups each or 16 blocks with 2 groups each.
• Remote Control Group: A group of multiple indoor units (max 16) connected by the transmission line of the remote control switch.
The same settings are applied to all the indoor units in the same remote control group.
• Main Unit: The representative unit of the remote control group. The central station transmits control orders to this representative
unit.
• Sub Unit: Indoor units other than the main unit of the remote control group.
PSC-A32MN
5.1.7.2 Main Unit Registration
• Only one unit can be registered as the main unit of a group. Thus, duplicate registration of the main unit is not possible inside
a group. If the unit registered as the main unit has to be changed for some reason, then cancel the current register of main unit
before registering the new main unit again.
• When indoor units with 3 and 4 available fan speeds are mixed in the same remote control group, register the indoor unit with 4
fan speeds as the main unit. If the indoor unit with 3 fan speeds is registered as the main unit, the fan speed setting number 4
cannot be selected for this group.
• When mixing indoor units with automatic swing louvre and indoor units without automatic swing louvre together in the same
remote control group, an indoor unit with auto-louvre shall be registered as the main unit of the group. If an indoor unit without
auto-louvre is registered as the main unit, then the auto-louvre setting cannot be applied for the entire group.
• When registering a group which has no transmission wiring, the indoor unit without a remote control switch cannot be registered
as the main unit.
17 PMML0332A rev.0 - 05/2015
Without
transmission
wiring
Group
Group
Block
One remote control switch
equals to one group
Group Group
Group
Block
One unit is also Without remote control switch, one
indoor unit equals to one group
handled as one group
Outdoor unit
Indoor unit
Remote
control switch
Group