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Liebert CRV
Liebert CRV - PD - 265086 - 11.01.2018
LOCKING DISCONNECT SWITCH
A molded case circuit interrupter disrupts the flow of power to the
unit. The electric panel high voltage compartment can only be accessed with the switch in the ‘off’ po-
sition. It is located behind the back door for a quick access.
5 PORT ETHERNET SWITCH
The unit is equipped with 5 port Ethernet Switch for connection of the
units into LAN to enable team work.
Chilled water models
CW COOLING COIL
It is constructed of copper tubes and hydrophilic coated aluminum fins. The hy
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drophilic coating provides superior water carryover resistance. Two stainless steel condensate drain
pans are provided.
CHILLED WATER SYSTEM
The water circuit includes a 3-way modulating valve. The Liebert iCOM
control positions the valve in response to room conditions. Cooling capacity will be controlled by by-
passing chilled water around the coil.
FAN
The unit is equipped with six plug fans: direct driven centrifugal fans with backward curved blades
and Electronically Commutated DC motors; commonly referred to as EC plug fans. The fan speed is
variable and automatically regulated by the iCOM control through all modes of operation.
Each fan has a dedicated motor and speed controller which provides a level of redundancy. The fans
pull air through the coil and are located on the front side of the unit.
3-WAY MODULATING VALVE
A 3-way modulating valve controls the chilled water flow passing through
the cooling coil. The iCOM control manages the valve actuator movement in order to provide the de-
sired amount of cooling for various entering water flow rates and temperatures. Cooling capacity is
regulated by bypassing chilled water around the coil. The maximum differential pressure across the
closed valve is 175 kPa. Maximum system pressure is 1586 kPa.
iCOM CONTROL SYSTEM
The Liebert CRV is controlled by the iCOM Control System. The standard
user interface is the Large Graphical Display (320x240 pixels, backlit) which presents system informa
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tion and allows all parameters to be viewed and adjusted. It features push-button navigation, operation-
al status LEDs, and a 3-level password protection system. iCOM without display is available as option.
Unit-to-Unit communication with other Liebert CRVs and two Intelli Slot communication card housings
are included as standard.
2T RACK TEMPERATURE SENSORS
Consist of a vented case with two temperature probes. Up
to 10 2T housings (20 temperature probes) can be connected to a Liebert CRV. One 2T housing and
both sensor probes are to be attached to a rack the cooling unit is conditioning. The sensors provide
real-time, direct feedback to the cooling unit to optimize the amount of cooling and airflow required; in
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creasing energy efficiency and ensuring proper rack inlet air temperatures. The sensor data can also be
reported to remote BMS and monitoring systems. The sensor network consists of one CAN wire leaving
the cooling unit and connecting to a 2T sensor. Each remaining 2T sensor is connected to the previous
sensor; often referred to as a daisy-chain configuration.
REMOTE SHUTDOWN TERMINAL
Provides the customer with a location to remotely shut down the
unit.
COMMON ALARM CONTACT
Provides the customer with a set of normally open (n/o) contacts for
remote indication of unit alarms.
CABINET
The exterior steel panels are custom powder coated to protect against corrosion. The dou-
ble wall constructed side panels separate the½“, 2.0 lb/ft3 insulation from the airs tream. The unit is
mounted on casters for quick installation and provided with leveling feet. The perforated inlet and outlet
panels have 81% open area.
SERVICE ACCESS
All service and maintenance is performed through the front and rear of the unit. No
side access is required. All electrical and piping connections are made through the top and/or bottom
of the unit.
FILTER
The unit is equipped with two air filters rated G2 following EN779, located within the cabinet,
and accessible from the rear of the unit. Air filter F5 are available as option. A filter clog alarm is included
as an option.
LOCKING DISCONNECT SWITCH
A molded case circuit interrupter disrupts the flow of power to the
unit. The electric panel high voltage compartment can only be accessed with the switch in the ’off’ po-
sition. Conveniently located behind the back door for a quick access.
5 PORT ETHERNET SWITCH
The unit is equipped with 5 port Ethernet Switch for connection of the
units into LAN to enable team work.
Summary of Contents for Liebert CRV 300 CW
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