Hitachi CENTRAL STATION PSC-A32MN Installations- Und Betriebshandbuch Seite 79

Operation
5.4.4.2 External Output Function
1 All Run Output
External output of indoor unit operation signal to the target group. The operation signal is output even if one indoor unit in the
target group is in operation.
2 External Output Alarm
External output alarm signal of indoor units to the target group. The alarm signal is output even if one indoor unit abnormality
occurs in the target group.
5.4.4.3 Specifications of the External Input/Output Terminals
• Input Terminal: Non-voltage contact (normal open) for demand signal Input DC12V, 10mA.
The contact can be switched.
Pulse width is 300 ms or more for pulse signal input.
• Output Terminal: Contact (voltage is applied) for signal Output DC12V.
Recommended Relay: MY Relay manufactured by Omron Corporation (Do not use a diode built-in type).
• Input/Output connection: using accessory connector cord.
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Connection procedure
1 In case that there is a section of cord which is not going to be used, please confirm the connector number, cut the cord as shown
in the figure on the right, and protect the cut section with locally supplied insulation tape.
2 Follow one of the procedures below in order to connect a relay or a timer with a locally supplied cord.
a. Soldering
Twist and solder copper wires together and insulate them by winding plastic tape around.
b. Caulking with closed-end connector accessory
Insert the closed-end connector after twisting and soldering copper wires together, then caulk with a clamping tool.(pull the
cord to check the tightness of the connection)
71 PMML0332A rev.0 - 05/2015
Cut out this portion
Protect the cut part using insulation tape
Insulation tape
Cut part
Cord (field-supplied)
Copper wires
Close-end Connector