Vertiv | Liebert PEX4 | User Manual 52
Installation
When 37# and 38# are opened, the unit will be shut down.
2.8.6. Customized Alarm Terminal
Terminals 50#, 51# and 55# can be connected to three kinds of sensors, and terminal 24# is their common
terminal and can be dened as smoke sensor and water-under-oor sensor. After the customer terminals are
connected to external alarm signals, the corresponding customized alarm should be set through the controller.
When the contact is open, and no external alarm is generated, the input state of the customer terminal is open.
But when the contact is closed, and the external alarm is generated, the input state of the customer terminal
will be shorted. At this point, the air conditioner system will generate an audible alarm, and the controller HMI
will display the alarm information.
• Terminals 50# and 24#: Smoke detector alarm switch
• Terminals 37# and 38#: Remote alarm
• Terminals 51# and 24#: Water-under-oor sensor by factory setting
2.8.7. External General Alarm
Terminals 75# and 76# can be connected to the external general alarms. The output signals to external alarm
devices, such as alarm indicator. When critical alarm occurs, the contact is closed to trigger remote alarms, send
signals to the building management system or dial the system automatically. The power supply of the external
general alarm system is user-prepared.
2.8.8. Connecting Solenoid Valve of Pipe Extension Kit (Optional)
The solenoid valve of the pipe extension kit has two control cables used to connect with the corresponding
terminals of the control board. The solenoid valve cables of 1# system and 2# system in dual system unit should
be marked separately to avoid wrong connection. For specic wiring terminals in the interface board, refer to
the circuit diagram printed on the unit label.
The controller uses the 24V AC solenoid valve port, if other types of solenoid valves are used,
consult Vertiv local representative.
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