Hitachi YUTAKI S Series Technical Catalogue page 140

10 Optional functions
Output/input signals for outdoor units and YUTAKI M units
10.3 Output/input signals for outdoor units and YUTAKI M units
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Output signals through 7-segment display on the unit PCB
The system has several output signals, which can be selected using the following connectors of the outdoor unit and
YUTAKI M PCB:
• Output connector CN7, which has two ports to configure two optional output signals.
The selection of these output signals represents the selection of some optional functions programmed in the PCB of the
RAS unit through the 7-segment display.
?
N O T E
• Do not set same function to multiple output ports. If set, the setting of the higher output number is cleared to
• Please refer to the Service Manual for detailed information of optional external input and output signals.
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Output signals on outdoor units and YUTAKI M units
Indication Output signal
No setting application
0
Operation signal
1
Alarm signal
2
Compressor ON signal
3
Defrost operation signal
4
132 TCGB0123 rev.2 - 10/2019
No setting.
This signal allows to notify that the unit is operating. It enables to start up additional systems
such as humidifiers, fans and other additional air-conditioning systems.
This signal allows to notify that protection devices have been activated and to transfer it to
additional systems.
This signal allows to notify that the compressor is activated. This function can be applied for
situations such as checking signals during remote-control operation and for the interlock of
the RAS unit.
This signal allows to notify that the unit is under defrosting operation.
00
Application
.