Hitachi PSC-A1T Technical Catalogue

The central control unit is designed to control up to 16 groups of up to 16 units (the maximum number of indoor units is
dened by the H-Link limit).
Each of these groups is made up of two types of unit:
• Master Unit: Unit selected in each group to control and set each of the group parameters equally and at the same
time.
• Slave Unit: Units (up to 15 in one group) which follow the master unit conguration assigned for this group.
To use the central control unit correctly, each group of units must be congured as indicated below:
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.
Examples of groups
IUIU IU
IU
IU
Master
Slave
1 group
1 group
1 group
1 group

Automatic initial group conguration
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 sta-
tion).
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
cycle on con-
nection check
Number of checked
indoor units connect-
ed in refrigerant cycle
on connection check
Completion of
connection check
In case of less than 16 indoor
units connected.
(Set automatically as of zone 1)
In case of more than 17 indoor
units connected.
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.”
• During the connection check, the indications of group No. and setting temperature 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.
5 Centralised remote controls
PSC-A64S
TCGB0106 rev.0 - 12/2014
376

Hitachi PSC-A1T Specifications

General

Brand	Hitachi
Model	PSC-A1T
Category	Controller
Language	English