Vertiv | Liebert PEX+ Chilled Water | User Manual 46
Electrical Installation
When Terminal 37# and Terminal 38# are opened, the unit will be shut down.
• Smoke Detector
Terminals 80# and Terminal 81# are used to connect output external alarms for the smoke sensor.
• Customized Alarm Terminal
Terminal 50#, Terminal 51# and Terminal 55# can be connected to three kinds of sensors such as smoke sensor
and water-under-floor sensor, and Terminal 24# is their common terminal. After the customer terminals are con-
nected with external alarm signals, set the corresponding customized alarm through the iCOM controller, for more
information refer to the Section 4.6.5 Set Alarms.
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 iCOM controller LCD will display the
alarm information.
Terminal 50# and Terminal 24#: Remote alarm (optional).
Terminals 51# and Terminal 24#: Water sensor (by default).
Terminals 55# and Terminal 24#: Setting safe switch for condensation water pump (optional).
• CPSS
When the CPSS is configured in the unit then connect one end of the CPSS to Terminals 55#, and the other end
to the common Terminals 24#.
• External General Alarm
Terminals 75# and Terminal 76# can be connected to the external general alarms. These terminals are controlled
by the common alarm relay K3 on the circuit board. The terminals output signal to external alarm devices, such as
alarm indicator. When a critical alarm occurs, the contactor will be closed to trigger remote alarms, send signals
to the Building Management System (BMS) or dials the paging system automatically. The power supply of the
external general alarm system is user-prepared.
For the detailed definition of other terminals, refer to Appendix 1 Circuit Diagram.
To Next Page
Loading...
Need help?
General
