Vertiv Liebert CRV300 Operator's manual

Liebert® CRV300
11-20kWDXversion;38-60kWCWversion
A/C Versions
Product Documentation
English , Cod. 265086, rev. 11.01.2018

Liebert CRV - PD - 265086 - 11.01.2018
Contents
Contents 1Product Description
2Application of Liebert CRV
3Liebert CRV
4Operation
5Microprocessor Controls
6Specications
7Heat Rejections
8Installation drawings
9Refrigerant, Hydraulic and
Electrical Connections
10 Refrigeration & Hydraulic Circuits
The product conforms to European Union directives
2006/42/EC; 2014/30/EU; 2014/35/EU; 2014/68/EU.
Units are supplied complete with a test
certicate and conformity declaration and
control component list.
Liebert®CRV units are CE marked as
they comply with the European directives
concerning mechanical, electrical and
electromagnetic safety.

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Product Description
Liebert CRV - PD - 265086 - 11.01.2018
1.1 Product Description
The Liebert®CRV is an air cooled full-featured direct expansion and chilled water Thermal Management
unit to be installed within a row of high density computing racks in a “hot-aisle-cold-aisle” conguration.
Air heated by the room equipment enters the unit from the hot aisle; it is ltered, cooled, conditioned,
and subsequently returned to the cold aisle. Supply air ow direction can be easily modied (via the
optional air discharge bafes) to the left side or to the right side or to both directions so it may be placed
between the racks or at the end of the row. It maximizes cooling effectiveness, reduces the occurrence
of hot spots and improves the overall system efciency.
The Liebert®CRV provides all the necessary functions provided by a standard precision air condition-
er including cooling, heating, humidication, dehumidication, air ltration, condensate management,
temperature control, alarm functions and data communications.
It is targeted for small and medium data centers and it is optimized to ensure maximum cooling capac-
ity in a minimal footprint. The efcient components of the system are managed by the Liebert iCOM®
Control system. The control monitors the environment in real-time by locating sensors on the inlet of
the racks that the unit is cooling. This information allows the unit to optimize its operations in terms of
performance and energy efciency.
Service and maintenance are performed through the front and rear of the unit. All piping and electrical
connections are made through the top or bottom of the unit.
1
CRV 300 CW CRV 300 DX

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Application of Liebert®CRV
Liebert CRV - PD - 265086 - 11.01.2018
2.1 First check
Before proceeding with Liebert®CRV application please make sure the unit selected is suitable for your
site. Liebert®CRV is targeted for small and medium data centers and it is optimized for maximum cool-
ing capacity in a minimal footprint. It is designed for high air inlet temperature (up to 40° C), therefore it
is advised to accomplish Hot-Cold aisle conguration.
Liebert®CRV is able to modulate the cooling capacity in order to quick adjust to any changing heat load.
Liebert® CRV is designed to provide proper control of the room temperature, humidity and air ltration.
The specic design of Liebert® CRV is optimized in order to be extremely efcient without providing
unnecessary latent cooling (dehumidication) not specically required for cooling of IT electronic equip-
ments, which enhance the overall cooling system efciency.
2.1.1 Hot-Cold aisle conguration
A best practice is to use rows of equipment racks in an alternating arrangement of cold aisles and hot
aisles.
In the cold aisle, the equipment racks are arranged face to face so the cold air discharged from the
Liebert® CRV unit(s) is drawn into the front of the servers and exhausted out through the rear into the
hot aisles. Hot aisles are literally hot because the objective of the alternating cold and hot aisle design
is to separate the source of cooling air from hot air discharge which returns to the Liebert® CRV unit(s).
Therefore, hot and cold aisle should be separated otherwise there would be a mix of hot and cold air
and thereby lower the temperature of the air returning to the CRV units, which reduces their usable
capacity.
Fig. 2a Example of high density installation with cold aisle and hot aisle alternation
2
Hot aisle
Hot aisle
CR
CR
CR
CR
CR
CR
CR
CR
Cold aisle
Cold aisle
Hot aisle

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Application of Liebert®CRV
Liebert CRV - PD - 265086 - 11.01.2018
2.1.2 Combination with other Cooling systems
Liebert® CRV may be combined with other cooling systems such as underow CRAC units (e.g. retrot
of current installation) until there is proper setting of both systems without inuencing each other. Oth-
erwise there is a risk of cycling or increased power consumption of both systems, in worst case causing
malfunction of the units. For details contact Vertiv sales representative.
2.2 Selection of Liebert®CRV unit(s)
2.2.1 Number and size
When designing a cooling solution using the Liebert® CRV unit(s), the initial steps are similar to those
required to cool a conventional critical space. The total heat load must be calculated, including sensible
and latent cooling requirements. These should be increased by the reserve capacity needed for pull-
down situations (e.g. after power failure) where the room temperature must be reduced and to cover
unexpected increases in the heat load. Consider also redundant capacity, which is usually not in use in
the normal operation, but takes duty if any of the running unit(s) fail.
So the different steps are:
• Check the heat load of IT equipment and apply safety margin if required.
• Dene size and number of Liebert®CRV units in order to provide enough net sensible cooling ca-
pacity to cover the heat load. Typical air inlet temperatures to be considered for normal operation
of the unit(s) are between 33° C and 37° C. Please refer also to point 2.2.3 Air Flow Requirements
• When N+X (typical N+1) redundancy is required, use more units so if any of the unit(s) fail, the
remaining unit(s) will cover the heat load. Always consider the layout of the room when dening
number of units, see chapter 2.4 Positioning-unit placement.
2.2.2 Air Flow Requirements
Liebert® CRV is optimized to provide precision cooling for IT equipment with temperature raise (delta T)
of cooling air passing through the equipment around 15 to 20 degrees Celsius or higher. Such tempera-
ture raise is typical for Blade servers and standard pizza servers. For applications with very low delta T,
around 10 degrees Celsius, typical for old fashion servers, it is necessary to de-rate cooling capacity of
the Liebert® CRV due to higher air ow equipment.
In case of application with Cold Aisle Containment (Smart Aisle) it is necessary to carefully investigate
the air ow through IT equipment and to dene number of Liebert®CRV units in order to provide at
least 5% more airow, excluding redundant unit(s). Otherwise there may occur a situation with negative
pressure in the Smart Aisle containment and hot air possibly leaking inside the containment.
2.3 Operating limits
The units are designed to operate within working ranges.
These limits are referred to new machines or to those that have been correctly installed and serviced.
The warranty clauses are no longer valid for any possible damage or malfunction that may occur during
or due to operation outside the application values.
2.3.1 For all units
From: To
Room air conditions
Temperature 27°C 40°C
Humidity ratio 5.5 g/kg 11 g/kg
Relative humidity 20 % 60 %
Storage conditions
Temperature - 20°C 50°C
Relative humidity Max. 90% RH, preventing
surface condensation.
Power supply tolerances V ± 10 %
Hz ± 2

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Application of Liebert®CRV
Liebert CRV - PD - 265086 - 11.01.2018
2.3.2 For A units
Outdoor temperature: lower limit -10°C
To install an air conditioner in places in which external temperature reaches very low values sometime
in the year requires some means of control to maintain adequate condensing pressures to ensure
proper liquid system operation.
With low temperatures the refrigerant condensates in pipeline and the liquid tends to fulll the condens-
er.
It’s mandatory to install the following components:
1. NON RETURN VALVE (liquid line)
Install a non- return valve in the liquid line directly out of the condenser. It doesn’t allow the liquid to
come back to the condenser (that means efciency loss and dangerous stress for the compressor).
2. VARIEX FAN SPEED CONTROL
Use Variex fan speed control to regulate the condensing pressure and have a continuous and better
subcooling control.
It’s suggested to have:
3. HORIZONTAL CONDENSER POSITION
The condenser horizontal disposition (vertical ow) is necessary to reduce subcooling variations due to
direct wind exposure. (very important to have a good subcooling control).
For all exceptions contact the Liebert®Sales Representative.
Outdoor temperature: higher limit
This limit is determined by coupled condenser model. In any case the max external temperature is 48°C
Exceeding of this limit (or a lack of maintenance), will caused a compressor stop by HP safety thermo-
stat. Reset to normal operation can only be carried out manually.
Remote Condenser
To ensure correct operation, best performance, and longest life the units must be connected to remote
condensers approved by Vertiv .
The warranty clauses are no longer valid if unit is connected to a not approved remote condenser.
For lenght higher than 30m condenser oversized +15%.
(1) For more details see User Manual
(2) Positive difference in height: condenser above conditioner. Negative difference in height: condenser below conditioner
2.3.3 For C units
Relative position room unit vs. 50 Hz remote condenser
From unit to condenser max distance equivalent length, m (1) 100
From unit to condenser max geodetic height, m (1) (2) Max above 30 Max below 8
Requirements
Pipe diameter (1) see the User Manual
Oil traps on vertical line of gas refrigerant, m every 6
Max. water pressure 16 bar
Max. differential pressure through the closed valve: Dpcv
Max. differential pressure across the valve for modulating service: Dpms
Models Dpcv (kPa) Dpms (kPa)
CR032RC 300 300
CR038RC 300 300
CR060RC 175 175

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Application of Liebert®CRV
Liebert CRV - PD - 265086 - 11.01.2018
2.4 Positioning - Units placement
This chapter provides some ideas of typical installation of the Liebert® CRV unit(s), shows several ex-
amples of the server room layouts and applications using Liebert®CRV units.
In order to eliminate the transmission of vibrations, avoid any contacts between Liebert®CRV unit and
the racks of the server room. If coverage (e.g. “Smart Aisle™”) is installed, avoid its contemporary con-
tact with both, racks and CRV.
For best performances of Liebert®CRV is important to:
• reduce at minimum recirculation from hot aisle around the ends and/or over the top of the racks,
prevent gaps between the racks
• reduce at minimum recirculation from hot aisle through server racks by using blanking panels
• ensure cold air is being distributed across the front of all neighboring equipment racks by properly
placed Liebert® CRV unit(s)
• distribute load within the rack - it is generally advised to distribute the load as much possible uni-
formly across the rack height.
For more details refer to following details or contact Vertiv Sales Representative.
2.4.1 Single Row Placement
The Liebert®CRV can be placed either at the end of a row or in between server racks. Locating a Lieb-
ert®CRV at the end of a row helps to isolate the end of the cold aisle from the surrounding space; pro-
tecting it from hot air wrapping around the sides of the aisle. The 2T rack temperature sensors sample
supply and return air temperatures.
When deploying multiple Liebert®CRV, it is recommended that units be installed at the end of rows
with their bafes set to direct cold supply air towards the server equipment (Fig. 2b). Depending on row
length, heat density and airow requirements, additional cooling units can be installed throughout the
row with their bafes set to direct supply air left and right.
Fig. 2b Liebert® CRV – Single Row Placement
2.4.2 Two Rows Placement
Cooling becomes more effective when there is a barrier or a second row of racks in front of the Liebert®
CRV unit. Also in this case it is recommended to install one Liebert®CRV unit at each end of the 2 rows,
with their bafes directed towards the IT equipment. Depending on the row length, heat density and
airow requirements, additional cooling units can be installed throughout the row with their bafes set
to direct supply air left and right (Fig. 2c).
C
R
V
Cold Supply Air
Rack Rack Rack C
R
V
Rack Rack Rack C
R
V
Hot Return Air

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Application of Liebert®CRV
Liebert CRV - PD - 265086 - 11.01.2018
Fig. 2c Liebert® CRV – Two Rows Placement
Cooling unit location within a row becomes less critical when deployed in SmartAisle™ containment,
but it is recommended that the Liebert®CRV be evenly spaced in each row. Using room barriers, such
as walls shown in Fig. 2.d and Fig. 2.e, it can be very effective in simulating aisle containment.
When the depths of a Liebert®CRV and neighboring server rack are not the same, it is important to
align the front edges of the Liebert®CRV with the front edges of the neighboring server racks to allow
for proper air distribution.
Fig. 2d Simulated aisle containment using room barriers – single row
Cold Supply Air – Cold Aisle
Rack Rack Rack Rack Rack Rack
Hot Return Air – Hot Aisle
Rack Rack Rack Rack Rack Rack
Hot Return Air – Hot Aisle
C
R
V
C
R
V
C
R
V
C
R
V
C
R
V
C
R
V
Cold Supply Air
Hot Return Air
1.8m Maximum
Distance to Barrier
Rack Rack Rack Rack Rack
C
R
V

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Application of Liebert®CRV
Liebert CRV - PD - 265086 - 11.01.2018
Fig. 2e Simulated aisle containment using room barriers - multiple rows
2.4.3 Liebert® CRV Applied in SmartAisle™ Cold Aisle Containment
Using the Liebert®CRV with the SmartAisleTM is always recommended to ensure top efciency, but not
required. It is an excellent solution when attempting to cool widely varying heat loads, (ie. exceeding
10kW per rack), and when seeking the highest efciency systems. Fully containing the cold aisle will
allow to automatically balance the Liebert® CRV cooling capacity and airow to the server rack’s re-
quirements in real-time.
The 2T rack temperature sensors installed in the sensor boxes of the containment can be used to con-
trol the fan speed of the unit in the SmartAisleTM mode.
Version “Without Air Discharge Bafes” can be used in SmartAisleTM applications.
Fig. 2f Liebert® CRV Placement in SmartAisleTM Cold Aisle Containment Application
Hot Return Air
Hot Return Air
Cold Supply
Air
C
R
V
C
R
V
Rack Rack Rack Rack
Rack Rack Rack Rack
Cold Supply Air –
Cold Aisle Containment
Rack Rack
Rack Rack Rack
Hot Return Air – Hot Aisle
Rack Rack Rack Rack Rack
Hot Return Air – Hot Aisle
C
R
V
C
R
V
C
R
V
C
R
V

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Application of Liebert®CRV
Liebert CRV - PD - 265086 - 11.01.2018
2.5 Temperature sensors
The sensor may be placed where desired or left coiled inside the unit. It is recommended that the sen-
sor be routed to the front of the heat load for the most accurate temperature reading. In InRow cong-
uration, the temperature sensor monitors the temperature of the air entering the rack equipment. The
reading is used to control the operation of the unit, so the sensor must be placed as directed below or
the equipment will not operate properly.
Insert the rack temperature sensor connector in the temperature sensor port at the iCOM interface.
Secure the temperature sensor in front of the warmest heat source in the enclosure. Do not secure in
front of a blanking panel. The sensors must be installed where lack of sufcient cooling air is most likely.
The optimum position of the rack temperature sensors will vary from installation to installation.
Servers most likely to have insufcient or inadequately cooled cooling air due to the recirculation of hot
air from the hot aisle include:
• Servers positioned at the top of a rack.
• Servers positioned at any height in the last rack at an open end of a row.
• Servers positioned behind ow-impairing obstacles such as building elements.
• Servers positioned in a bank of high-density racks.
• Servers positioned next to racks with air removal units.
• Servers positioned very far from the equipment.
• Servers positioned very close to the equipment.

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Liebert CRV
Liebert CRV - PD - 265086 - 11.01.2018
3.1 Standard features
Air cooled models
DX COOLING COIL It is constructed of copper tubes and hydrophilic coated aluminium ns. The hy-
drophilic coating provides superior water carryover resistance. A stainless steel condensate drain pans
are provided.
REFRIGERATION SYSTEM Single refrigeration circuit includes a liquid line lter drier, a refrigerant
sight glass with moisture indicator, an electronic expansion valve, and a liquid line solenoid valve.
COMPRESSOR The compressor is an R410A DC inverter scroll type with variable capacity operation
from 30-100%. The limit of capacity variation is depending by the installation type and the room condi-
tions. The compressor has a suction gas cooled motor, vibration isolators, internal thermal overloads,
manual reset high pressure switch, low pressure and high pressure transducer, crankcase heater, in-
ternal centrifugal oil pump, and an operating speed of 3000RPM @ 50Hz.
ELECTRONIC EXPANSION VALVE DEVICE (EXV) The valve is designed for modulating control of
refrigerant circuits with high speed and high precision. It is suitable for use as expansion device in
refrigerant circuits with DC Inverter Scroll compressor, with organic safety refrigerants (i.e. R410A).
For variable capacity systems, an EXV provides superior performance as compared to a traditional
thermostatic expansion valve (TXV), due to:
• Precise ow control
• Positioning time
Electronic expansion valve ensure a better control on superheating at the outlet of the evaporator, en-
suring at same that compressor will never be lled by liquid. Moreover the EXV valve let the condensing
temperature goes down to 33°C.
FAN The unit is equipped with ve (CR021) or three (CR011) direct driven radial 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 oper-
ation. Each fan has a dedicated motor which provides a level of redundancy. The fans pull air through
the coil and are located on the front side of the unit.
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-
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 without display can be controlled through a display of another unit in the same group or through a
service display. Unit-to-Unit communication with other Liebert CRVs and two IntelliSlot 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 airow required; in-
creasing energy efciency 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 conguration.
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 the ½”, 2.0 lb/ft3 insulation from the airstream. The unit is
mounted on casters for quick installation and provided with levelling 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;
including any component removal. 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 lters rated G2 following EN779, located within the cabinet,
and accessible from the rear of the unit. Air lter F5 are available as option. A lter clog alarm is included
as an option.
3

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Liebert CRV
Liebert CRV - PD - 265086 - 11.01.2018
LOCKING DISCONNECT SWITCH A molded case circuit interrupter disrupts the ow 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 ns. The hy-
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 ow 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 ow 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-
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 airow required; in-
creasing energy efciency 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 conguration.
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 lters rated G2 following EN779, located within the cabinet,
and accessible from the rear of the unit. Air lter F5 are available as option. A lter clog alarm is included
as an option.
LOCKING DISCONNECT SWITCH A molded case circuit interrupter disrupts the ow 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.

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Liebert CRV
Liebert CRV - PD - 265086 - 11.01.2018
3.2 Optional features
Air cooled models
SUPPLY AIR BAFFLE A eld adjustable, modular supply air bafe is located in the discharge air
stream. It can be quickly and easily recongured to redirect airow. The angles of the vanes have been
optimized to effectively distribute air to heat generating equipment in a wide variety of applications.
CONDENSATE PUMP It has a capacity of 50 l/h at 3.7 m head. A oat signal is available for a remote
alarm. Please notice that at 4 m head the owrate is 0.
HUMIDIFIER A steam generating canister humidier is factory-installed in the cooling unit and is oper-
ated by the iCOM control system. It is complete with disposable cylinder, all supply and drain valves,
steam distributor and electronic controls. The need to change the canister is inticated on the iCOM
display, if available. The humidier is designed to operate with water conductivity from 125-500 (50Hz)
microS/cm. System automatically lls and drains as well as maintains the required water level based on
conductivity. An air-gap within the humidier assembly shall prevent backow of the humidier supply
water. The humidier is removable from the rear of the cabinet.
ELECTRIC REHEAT The electric reheat coils are low watt density, 304 stainless steel n-tubular con-
struction, protected by thermal safety switches and controlled in one stage.
INTELLISLOT UNITY CARD (IS-UNITY-DP) Provides monitoring via SNMP, Modbus (RS485/IP),
BACnet (RS485/IP) and HTTP (Web) protocols
INTELLISLOT SITESCAN CARD (IS-485EXI) Provides monitoring via Liebert SiteScan Web 4.0 Pro-
tocol
FILTER The optional F5 class (following EN779) lters are two deep pleated 60 mm, located within the
cabinet and accessible from the rear of the unit. A lter clog alarm is included as an option.
ONE (1) EXTRA COMMON ALARM CONTACT Provides the customer with a total of two sets of nor-
mally open (n/o) contacts for remote indication of unit alarms.
LIQUISTAT SENSOR Is a solid state water sensor that has no moving parts and is hermetically sealed
to keep out dust and dirt. When the sensor detects the presence of moisture the alarm system is acti-
vated.
DUAL POWER SUPPLY with an internal automatic transfer switch is available as an option. With this
option the unit can be connected to 2 separate power supplies where each power supply is able to com-
pletely feed the unit. In case of failure of the main supply the unit automatically switches to the second
power supply. This allows to have a complete power supply redundancy.
Chilled water models
CONDENSATE PUMP It has a capacity of 50 l/h at 3.7 m head. A oat signal is available for a remote
alarm. Please notice that at 4 m head the owrate is 0.
HUMIDIFIER A steam generating canister humidier is factory-installed in the cooling unit and is oper-
ated by the iCOM control system. It is complete with disposable cylinder, all supply and drain valves,
steam distributor and electronic controls. The need to change the canister is indicated on the iCOM
display, if available. The humidier is designed to operate with water conductivity from 125-500 (50Hz)
micro S/cm. System automatically lls and drains as well as maintains the required water level based on
conductivity. An air-gap within the humidier assembly shall prevent backow of the humidier supply
water. The humidier is removable from the rear of the cabinet.
ELECTRIC REHEAT The electric reheat coils are low watt density, 304 stainless steel n---tubular
construction, protected by thermal safety switches and controlled in one stage.
2-WAY MODULATING VALVE A 2-way modulating valve controls the chilled water ow 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 ow rates and temperatures. Cooling capacity is
regulated by closing-off the chilled water ow. The maximum differential pressure across the closed
valve is 175 kPa. Maximum system pressure is 1586 kPa.
SUPPLY AIR BAFFLE A eld adjustable, modular supply air bafe is located in the discharge air
stream. It can be quickly and easily recongured to redirect airow. The angles of the vanes have been
optimized to effectively distribute air to heat generating equipment in a wide variety of applications.
INTELLISLOT UNITY CARD (IS-UNITY-DP) Provides monitoring via SNMP, Modbus (RS485/IP),
BACnet (RS485/IP) and HTTP (Web) protocols.
INTELLISLOT SITESCAN CARD (IS-485EXI) Provides monitoring via Liebert SiteScan Web 4.0 Pro-
tocol.

3 - 12
Liebert CRV
Liebert CRV - PD - 265086 - 11.01.2018
FILTER The optional F5 class (following EN779) lters are two deep pleated 60 mm, located within the
cabinet and accessible from the rear of the unit. A lter clog alarm is included as an option.
ONE (1) EXTRA COMMON ALARM CONTACT Provides the customer with a total of two sets of nor-
mally open (n/o) contacts for remote indication of unit alarms.
LIQUISTAT SENSOR Is a solid state water sensor that has no moving parts and is hermetically sealed
to keep out dust and dirt. When the sensor detects the presence of moisture the alarm system is acti-
vated.
DUAL POWER SUPPLY with an internal automatic transfer switch is available as an option. With this
option the unit can be connected to 2 separate power supplies where each power supply is able to com-
pletely feed the unit. In case of failure of the main supply the unit automatically switches to the second
power supply. This allows to have a complete power supply redundancy.

4 - 13
Operation
Liebert CRV - PD - 265086 - 11.01.2018
Unit operation is completely automatic. The below sequence explains how the unit operates:
• The air, sucked in by the continuously operating fans, enters the unit.
• The air is immediately ltered.
• The TEMPERATURE sensor or HUMITEMP (temperature + rel. humidity) sensor (depends on unit
conguration), veries the state of the inlet air, and relays this information to the control system.
• The air is treated and then blown out of the unit.
• The control system compares the relayed information to the set point and proportional band values
programmed into its memory: it then commands the air conditioner to treat the air as follows (see
also Control manual).
4.1 Cooling
• Direct expansion mode (DX)
The compressor is started and the cold refrigerant ows through the evaporator, thus cooling the
air passing over it. For compressor operation see Control manual.
• Chilled water mode (CW)
The three ways valve is opened and the chilled water ows through the coil, thus cooling the air
passing over it.
For valve operation see Control manual.
4.2 Heating
• Electrical heating (optional): the heating elements heat the air passing over them. There is one
heating steps activate in case of dehumidication if supply air temperature is too low (for heating
logic see Control manual)
4.3 Dehumidication
• DX mode
The compressors starts and either the air ow or the evaporator surface is reduced (increasing
modulation capacity of compressor), thereby causing dehumidication (refer also to Control man-
ual).
• N.B.: If, during dehumidication, the ambient temperature drops below a specied level, dehumidi-
cation will be stopped if necessary (see LOW LIMIT intervention in Control manual).
In dehumidication mode, the air after passing over the coil it’s reheated (if needed) by electrical
heater to re-stabilize the initial temperature
4.4 Humidication - optional
• The humidier creates steam, which is distributed into the air via the steam distribution pipe
4

5 - 14
Microprocessor Controls
Liebert CRV - PD - 265086 - 11.01.2018
5.1 iCOM Control
Liebert CRV models are controlled by iCOM Medium Board
(Fig. 5.a).
The control board is housed in the electrical panel and it is
connected to the remote display, to be installed in the contain-
er/room (connection cable is included).
• The standard user interface is a graphical display (128 x
64 pixels, backlit) showing parameter values and the rele-
vant symbols/codes in a tree menu. It features navigation
push-buttons and status leds.
Self-explanatory icons are used for the menu-layout of
the display.
• Status Report of the latest 400 event-messages of the
unit.
• Graphic Data Records for temperature and humidity
• Both high and low priority alarms activate a visual indica-
tor and buzzer.
• Input for remote on-off and volt-free contacts for simple
remote monitoring of low and high priority alarms: high/
low temperature, high/low refrigerant pressure, fan/con-
trol failure, compressor/control failure and others are available.
• LAN management: functions provided as standard include stand-by (in case of failure of the unit in
operation, the second one starts automatically), and automatic rotation.
• All settings are protected through a 3-Level password system (*).
• Automatic restart is provided after a power failure.
Tab. 5a - Technical Data
5
Technical Data iCOM Medium
E2prom 4Mbit + 512kbit
Flash memory 32Mbit
RAM memory space 128Mbit
Microcontroller Coldre 32Mbit
Analogue Input 3 x 0-10V,0-5V,4..20mA (selectable) + 2 PTC/NTC + 3 NTC
Digital Input 9 x opto-coupled
Analogue Output 2 x 0-10V
Digital Output 7 triacs output and 2 relay output
Time and date function buffered by LI-battery
Hirobus Lan connectors 2 RJ45 sockets (for unit in LAN, remote display)
Ethernet network connectors 1 RJ45 socket
CAN bus connectors 2 RJ12 sockets
Hironet connectors 1 RJ9 socket for RS485 (direct connection to proprietary supervision)

5 - 15
Microprocessor Controls
Liebert CRV - PD - 265086 - 11.01.2018
5.2 CDL Graphic Display (option)
• Large graphic display (320 x 240 pixels)
• Self-explanatory icons are used for the menu-layout of the CDL Display.
• Status Report of the latest 400 event-messages of the unit/system.
• Graphic Data Records for temperature and humidity, selectable time-
frames from 8 minutes to 2 weeks.
• Semi or Full Manual Mode software management including all safety
devices.
• 4-Level Password system to protect all settings.
• Ergonomic design for use also as portable device (start-up and “ying
connections” by service personnel).
Technical Data CDL Graphic Display
- Microcontroller: . . . . . . . . . . . . . . . . . . . Coldre 32Mbit
- Ethernet network connectors . . . . . . . 2 RJ45 sockets (for unit in LAN, remote display)
- CAN bus connectors . . . . . . . . . . . . . . 2 RJ12 sockets
- Power supply: . . . . . . . . . . . . . . . . . . . . via CAN bus or external 12Vdc supply
5.3 iCOM without Display (option)
• Internal 3 digit display
• 3 color LED light status indicator on front door
• Switch for local ON/OFF on front door
CRV units with internal display can be controlled by a 3 digit
internal display located behind the front door or through CDL
of another CRV unit in the same network group. The 3 color
LED light indicator provides information about the unit status
(Active, Stand by, Alarm).
The hole for the CDL is covered by a blanking panel which en-
ables easy eld upgrade of this unit with CDL if needed in the
future. CDL upgrade kit is available as an accessory.

6 - 16
Specications
Liebert CRV - PD - 265086 - 11.01.2018
1.1 Performances - air cooled
6
Tab. 6a - Air cooled
Cond. Temp. 45°C
CR011RA CR021RA
40°C DB - 20% RH
Net Total kW 11.8 20.9
Net Sensible kW 11.8 20.9
Unit Power Input kW 2.99 5.16
Heat rejection kW 14.79 26.06
Supply Air Temperature °C 26.3 23.8
37°C DB - 24% RH
Net Total kW 11.6 20.6
Net Sensible kW 11.6 20.6
Unit Power Input kW 3.17 5.49
Heat rejection kW 14.77 26.09
Supply Air Temperature °C 23.7 21.2
35°C DB - 26% RH
Net Total kW 11.4 20.3
Net Sensible kW 11.4 20.3
Unit Power Input kW 3.30 5.68
Heat rejection kW 14.70 25.98
Supply Air Temperature °C 22 19.5
32°C DB - 29% RH
Net Total kW 11.2 19.7
Net Sensible kW 11.2 19.7
Unit Power Input kW 3.57 5.94
Heat rejection kW 14.77 25.64
Supply Air Temperature °C 19.4 17.1
30°C DB - 34% RH
Net Total kW 11 19.4
Net Sensible kW 11 19.4
Unit Power Input kW 3.58 6.14
Heat rejection kW 14.58 25.54
Supply Air Temperature °C 17.6 15.5
28°C DB - 38% RH
Net Total kW 10.9 19.3
Net Sensible kW 10.9 19.3
Unit Power Input kW 3.63 6.27
Heat rejection kW 14.53 25.57
Supply Air Temperature °C 15.9 13.3

6 - 17
Specications
Liebert CRV - PD - 265086 - 11.01.2018
Cond. Temp. 45°C
CR011RA CR021RA
28°C DB - 45% RH
Net Total kW 11.3 19.7
Net Sensible kW 10.7 17.9
Unit Power Input kW 3.57 6.01
Heat rejection kW 14.87 25.71
Supply Air Temperature °C 16.1 14.8
25°C DB - 45% RH
Net Total kW 10.7 18.9
Net Sensible kW 10.6 17.7
Unit Power Input kW 3.77 6.40
Heat rejection kW 14.37 25.30
Supply Air Temperature °C 13.3 12
25°C DB - 40% RH
Net Total kW 10.4 18.6
Net Sensible kW 10.4 18.6
Unit Power Input kW 3.78 6.53
Heat rejection kW 14.18 25.13
Supply Air Temperature °C 13.5 11.2
22°C DB - 55% RH
Net Total kW 10.4 18.6
Net Sensible kW 8.9 15.1
Unit Power Input kW 3.78 6.53
Heat rejection kW 14.18 25.13
Supply Air Temperature °C 12.4 11.1
22°C DB - 50% RH
Net Total kW 10.1 18.3
Net Sensible kW 9.4 16.1
Unit Power Input kW 3.79 6.60
Heat rejection kW 13.89 24.9
Supply Air Temperature °C 11.8 10.3