Item
Description
Item
Description
A
CRD25 evaporator
2
CAN 1 port
B
CRD35 evaporator
3
CAN 2 port
1
Unity card
4
RS485-1
6.2.2 Connecting Communications Cable between Evaporator and Condenser
The communications cable is not provided with the unit. To connect the communications cable, connect one end of the
cable to the A2 and B2 terminals of the evaporator, and connect the other end to the A2 and B2 terminals of the condenser.
The iCOM Edge board controls the operation of condenser fans through the communications cable.
NOTE: Use shielded cables as communication cables. The size of the cable should be larger than 0.75 mm
2
, and the
length should be shorter than 150 m (492.1 ft).
6.2.3 Connecting the Water Leakage Sensor (Optional)
The water leakage sensor is provided in the accessories bag. To connect the water leakage sensor, connect it to the 51 and
24 terminals.
6.2.4 Connecting the Static Pressure Sensor (Optional)
The static pressure sensor is not provided with the unit. To connect the static pressure sensor, connect it to the 41 and 42
terminals on the terminal block.
6.2.5 Connecting the Monitor Device to Unity Card (Optional)
The monitor device is not provided with the unit. To connect the monitor device, connect it to the Ethernet port on the unity
card.
6.2.6 Connecting Alarm Device (Optional)
The alarm device is not provided with the unit. To connect the alarm device, connect it to the 75 and 76 terminals on the
terminal block, so that the iCOM Edge can send alarms to the alarm device.
6.2.7 Connecting Remote Temperature Sensors (Optional)
One remote temperature sensor is provided in the accessories bag. The unit can be connected with a maximum of 10
temperature sensors. It is recommended to place the sensors in front of the heat loads, 1.5 m (4.9 ft) higher than the unit
base.
To connect remote temperature sensors:
1.
Insert the connector of the sensor to the RS485-1 port. Route the cable through the top or bottom of the unit.
Connect the second sensor to the first sensor.
2.
Fix the sensor on rack surface using the magnets provided in the kit. Do not fix it on an empty rack. Set the
address on the dialing switch on the sensor, according to the following table.
6 Electrical Connections
45
Vertiv™ Liebert® CRV CRD25 and CRD35 Row-Based Cooling System User Manual
