Electrical And Control Settings - Hitachi YUTAKI ATW-YCC-03 Installation And Operation Manual

ELECTRICAL AND CONTROL SETTINGS

9 ELECTRICAL AND CONTROL SETTINGS
9.1 ELECTRICAL WIRING
9.1.1 Connections on the Terminal board 1 (TB1)
The followings connections on the Terminal board 1 of the YUTAKI CASCADE CONTROLLER are required:
N
L1
ELB CB 1~ 230V 50Hz
9.1.2 Connections on the Terminal board 2 (TB2)
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C A U T I O N
When installing the YUTAKI CASCADE CONTROLLER (ATW-YCC-03) electrical connections for the control of the system must be done on
the terminal board 2 of the YUTAKI CASCADE CONTROLLER rather than perform those connections on the terminal board of the YUTAKI.
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H-LINK connection
The YUTAKI units, YUTAKI CASCADE CONTROLLER and outdoor units are interconnected via bus called H-LINK II, consisting of 2
non-polarity cables and accepting lengths of up to 1000 m. All YUTAKI and Outdoor units which are controlled by the same YUTAKI
CASCADE CONTROLLER unit must be connected at the same H-LINK II line:
ATW-YCC-03
YUTAKI YUTAKI YUTAKI YUTAKI
YUTAKI
OU 1
OU n OU 2
OU n OU 2 OU 1
Setting of End Terminal Resistance
When connecting outdoor units to an H-LINK II line, it is necessary to set the end terminal resistance as active (DSW5-1 ON) in only
one of the units. Pin 1 of DSW5 is factory set to ON in all the outdoor units. Therefore, when connecting multiple outdoor units to an
H-LINK II line, please check and make sure that only one of the units has pin 1 of DSW5 set to ON, and the rest of the units have pin
1 of DSW5 set to OFF.
1 2 n
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17 PMML0581 rev.1 - 02/2023 - 1000011627