Hitachi RAS-4.5HNBRKQ1 - External Output Function Setting

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EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING
2.3 External Output Function Setting
The following signals can be picked from the outdoor unit PCB.
(1) Output Operation Signal (Control Function No.1)
This function is utilized to receive the operation signal.
Auxiliary relay contacting (RYa) is closed during the operation. The operation signal will be sent to
output terminals when the indoor units are operating. (Even when one indoor unit is operating, the signal
will be sent.) This function can be used for circulator or humidier operation.
(2) Output Alarm Signal (Control Function No.2)
This function is utilized to receive the alarm signal.
Auxiliary relay contacting (RYa) is closed when the alarm occurs. The alarm signal will be sent to
output terminals when the alarm occurs from the indoor units. (The signal will be sent even when the alarm
occurs from one indoor unit.)