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Hitachi PSC-A64S Installation And Operation Manual page 7

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GROUP SETTING
6
Central station
Group
One remote control switch
group is considered as one
group
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.
Check for connecting condition of air conditioner
After completion of electrical wiring work and test running of the air conditioner, turn ON the power
supply of the central station. (Ensure to perform the test runing of the air conditioner before turning
ON the power supply of the central station).
In case that group setting is not performed, the indication of the central station is as shown below for
checking indoor unit connection after turning ON the power supply.
Refrigerant
Number of checked
cycle on
indoor units
connection
connected in
check
refrigerant cycle on
connection check
NOTE:
The checked number of connected indoor units may be more than the actual number according
to the condition of transmission.
After the connection check, the indications of "GROUP" and "SET TEMP."
may be "- -"temporarily.
When the "63" alarm is indicated, the setting of H-LINKII adaptive is wrong. Check for the setting
of the central station and other central controller used together.
Group
Group
Zone
The remote control switch
group with one indoor unit
is also considered as one
group
Completion of
connection check
In case of less than 16
indoor units connected.
(Set automatically as of
zone 1)
Outdoor unit
Remote
Control Switch
Group
Group
Group
As for the indoor unit
without remote control
switch, one indoor unit is
considered as one group.
In case of more than 17
indoor units connected.
Indoor unit

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