Vertiv | Liebert® CRV4 | User Manual 45
Electrical Installation
4.2.7. Remote Shutdown
As shown in Figure 4-3, terminals 37# and 38# can be connected to the remote shutdown switches. The
terminals must be short-connected before delivery. If a remote shutdown terminals are connected at the time of
commissioning, remove the short-connect cable. Closing the terminals 37# and 38# will shut down the unit.
4.2.8. Control Signals of the Outdoor Unit
Terminals 70# & 71# are the control signal input terminals of the outdoor unit. Their On and O state is same
as that of the compressor. They can be connected to the compressor rotation speed control terminals on the
control board of the outdoor unit. However, connecting them is an option depending on the requirement.
4.2.9. External General Alarm
Terminals 75# and 76# can be connected to the external general alarms. They generate signals to external
alarm devices such as an alarm indicator. When the critical alarm occurs, the contact will be closed to trigger
remote alarms, send signals to the building management system, or dial the paging system automatically.
The users have to obtain the power supply of external general alarm system. For a in-depth denition of the
other terminals, refer to the Circuit Diagram in the Appendix 1.
4.2.10. Connecting the Solenoid Valve of the Long Piping Kit- (Optional for site
installation)
The solenoid valve of the long piping kit consists of two control cables which are connected to their respective
terminals on the control board. For more specic connecting points on the interface board, refer to the
connecting terminal number of the liquid route solenoid valve shown in the Circuit Diagram in the Appendix 1
section.
4.2.11. Teamwork Control
If user need to use the teamwork control function, user should connect the communication cables to terminals
61# & 62# on the TB2 terminal block.
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