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Liebert.CRV Series Air Conditioner
User Manual
Version V1.4
Revision date May 28, 2012
BOM 31011886
Emerson Network Power provides customers with technical support. Users may contact
the nearest Emerson local sales office or service center.
Copyright © 2010 by Emerson Network Power Co., Ltd.
All rights reserved. The contents in this document are subject to change without notice.
Emerson Network Power Co., Ltd.
Address: No.1 Kefa Rd., Science & Industry Park, Nanshan District 518057, Shenzhen
China
Homepage: www.emersonnetworkpower.com.cn
E-mail: support@emersonnetwork.com.cn
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Important Safety Instructions
Warning
The manual is retained for the entire service life of the machine.
The user reads the manually carefully before carrying out any operations on the machine.
The machine is a piece of professional equipment for use in industry, trades, and other professions, and it is not
intended for sale to the general public.
The machine is used exclusively for the purpose for which it is intended; incorrect use of the machine shall release the
manufacturer any liability.
This manual has been prepared to enable the end-user to carry out only the operation that can be made with the panels
closed. Any operation that require the opening of doors or equipment panels must be carried out only by qualified personnel.
Each machine is equipped with an Electric Insulation device which allows the operator to work in condition of safety. Switch
off the machine with this electric insulation device before any maintenance operation to eliminate risks remaining (electric
shocks, burns, automatic restarting, moving parts and remote control).
The panel key supplied with the unit must be kept by person responsible for maintenance.
For identification of the unit (model and serial no.) in case of the necessity for assistance or spare parts, locate the
identification label on the outside of the unit.
Potential hazards
The protective covers can be removed only after the electric power has been cut off by opening the main switch.
A warning label on the front and back panels reminds that:
The machine restarts automatically.
The main switch must be opened before opening the internal compartments for any operation.
If the doors are opened immediately after the machine has been switched off, there might be some hazard related to:
Components still at high temperature
Electrical heaters
Compressor, outlet area and outlet piping (about 100°C)
Components still at low temperature Evaporator
Rotating elements Fan impellers, they might continue to rotate for a while by inertia
These residual risks are highlighted by warning labels on the machine.
Warning -
Risk of electric shock
Risk of electric shock. Can cause injury or death.
Disconnect local and remote power supplies before working within.
Before proceeding with installation, read all instructions, verify that all the parts are included and check the nameplate to be
sure the voltage matches available utility power.
The iCOM microprocessor does not isolate power from the unit, even in the ‘unit off’ mode.
Some internal components require and receive power even during the ‘unit off’ mode of iCOM control.
The factory-supplied optional disconnect switch is inside the unit. The line side of this switch contains live high-voltage.
The only way to ensure that there is NO voltage inside the unit is to install and open a remote disconnect switch. Refer to
unit electrical schematic.
Follow all local codes.
Warning -
Risk of explosive discharge from high-pressure refrigerant
Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.
This unit contains fluids and gases under high pressure. Relieve pressure before working with piping.
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Warning -
Risk of refrigerant system rupture or explosion from
overpressurization
Risk of refrigerant system rupture or explosion from overpressurization. Can cause equipment damage, injury or death.
If a pressure relief device is not provided with the condenser unit, the system installer must provide and install a discharge
pressure relief valve rated for a maximum of 609 psig (42bar) in the high side refrigerant circuit. Do not install a shutoff valve
between the compressor and the field installed relief valve.
One or more additional pressure relief valves are required downstream of any and all fieldinstalled isolation. Do not isolate
any refrigerant circuits from overpressurization protection.
For systems requiring EU CE compliance (50Hz), the pressure relief valve must be CE certified to the EU Pressure
Equipment Directive by an EU ‘Notified Body’.
Digit Nomenclature
The unit is fully defined by twenty-five digits.
1 1 12 3 4 5
6 7 8 9 10 11
.. ..
25
C R 0 2 0
Digit 1 and 2: Family
CR: Liebert.CRV
Digit 3, 4 and 5: Cooling
Capacity "kW" (approx.)
Nominal cooling capacity
Digit 6 - Air Discharge
R: Horizontal airflow
Digit 7 - System Type
A: System Type - Air cooled
W: System Type - Water cooled
C: System Type - Chilled Water
Digit 8 - Airflow
1: Airflow - EC Plug Fan
Digit 9 - Power Supply
0: Power Supply - 380V ~ 415V /3ph/50Hz+N
C: Power Supply - 208V/3ph/60Hz
A: Power Supply - 460V/3ph/60Hz
Digit 10 - Cooling System
2: Cooling System - CW with two way valve
3: Cooling System - CW with three Way
7: Cooling System - DX with digital scroll single
circuit R410A
Digit 11 - Humidification
0: Humidification - None
S: Humidification - Electrode humidifier
Digit 12 – Display
A: Display - Small Display 1 T+H Sensor
N: Display - Small Display 1 Temp Sensor Only
D: Display - Large Display 1 T+H sensor
C: Display - Large Display 1 Temp sensor Only
Digit 13 - Re-Heating
0: None
1: Electric heating 1 Level
Digit 14 - Air Filter
0: G4 (EU4)
1: F5 (EU5)
2: G4 (EU4) + Clogged Filter Alarm
3: F5 (EU5) + Clogged Filter Alarm
8: Merv 8 + Clogged Filter Alarm
9: Merv 11 + Clogged Filter Alarm
Digit 15 - Coil
1: Air cooled - water cooled two ways water valve
7: Water cooled 3 ways water valve
H: CW Standard coil
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Digit 16 - Enclosure options
1: Color Standard
2: Color Special
Digit 17 - Condensate pump/crankcase heater
A: DX units - crankcase heater
E: DX units - condensate pump & crankcase heater
L: CW units - no condensate pump
5: CW units - condensate pump
Digit 18 - Option Package
0: None
L: Option Package #1 – humidifier and reheat
lockout & compressor jacket & one additional alarm
H: Option Package - Reheat & Humidifier Lockout
C: Option Package #2 - humidifier and reheat
lockout & one additional alarm
D: Option Package #3 – compressor jacket
Digit 19 - Monitoring
N: Without IS housing
0: With IS housing/no card
1: One IS web card
2: Two IS web cards
3: One IS485 card
4: Two IS485 cards
5: IS web & IS 485 cards
Digit 20 - Sensors
0: Sensors - None
H: Sensors - High Temperature - Firestat
S: Sensors - Smoke Sensor - Smokestat
F: Sensors - Smoke & High Temp - Smoke and
Firestat
Digit 21 - Packaging
P: PLP and pallet Domestic
C: PLP and wooden crate Export
S: Seaworthy
Digit 22 - Special Requirements
A: SFA - none
X: SFA included
Digit 23-25 - Order Identifier
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Contents
Chapter 1 Preliminary Operations ....................................................................................................................................... 1
1.1 Inspection ............................................................................................................................................................. 1
1.2 Handling ................................................................................................................................................................ 1
1.3 Operating Limits .................................................................................................................................................... 2
1.4 Noise Level Limits ................................................................................................................................................. 4
1.5 Product Description ............................................................................................................................................... 4
Chapter 2 Unit Positioning ................................................................................................................................................... 8
Chapter 3 Unpacking And Installation ............................................................................................................................... 13
3.1 Reference Guide For Receiving, Unpacking, And Preparing For Installation ...................................................... 13
3.1.1 Equipment Inspection .............................................................................................................................. 13
3.1.2 Packing Material ...................................................................................................................................... 13
3.2 Recommended Unit Handling Equipment ........................................................................................................... 13
3.3 Handling The Unit While Packaged .................................................................................................................... 14
3.4 Unpacking The Unit ............................................................................................................................................ 14
3.5 Installation ........................................................................................................................................................... 16
Chapter 4 Refrigeration Connections ................................................................................................................................ 19
4.1 Refrigeration Pipeline Connections For Air-Cooled (A) Units .............................................................................. 19
4.1.1 General Layout ........................................................................................................................................ 19
4.1.2 Pipe Diameter And Thickness ................................................................................................................. 20
4.1.3 Installing Pipelines ................................................................................................................................... 21
4.2 Vacuum Creation And Refrigerant Charge ......................................................................................................... 22
4.2.1 R410A Precharge For Air-Cooled (A) Units ............................................................................................. 23
4.2.2 Refrigerant Charge For Air-Cooled (A) Units ........................................................................................... 24
4.3 Refrigeration Circuits .......................................................................................................................................... 24
Chapter 5 Water Connections ........................................................................................................................................... 25
5.1 General Warning ................................................................................................................................................. 25
5.2 Water Connections – Supply Humidifier And Drain Water (All Units) .................................................................. 26
5.3 Chilled Water Connections For Water/Glycol-Cooled (W) Units ......................................................................... 27
5.3.1 Notes For Open Circuit Applications ........................................................................................................ 27
5.3.2 Notes For Closed Circuit Applications ..................................................................................................... 27
5.4 Chilled Water Connections For Chilled Water (C) Units ...................................................................................... 28
Chapter 6 Electrical Connections ...................................................................................................................................... 30
6.1 Cable Entry Ports, Routing Cables And Connection Procedures ........................................................................ 30
6.2 Protective Features Of EC Fans ......................................................................................................................... 31
6.3 Protective Features Of Electrical Heaters ........................................................................................................... 32
6.4 Temperature Probes Placed On Racks .............................................................................................................. 32
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Chapter 7 Start-Up ............................................................................................................................................................ 35
7.1 First Start-Up (Or After Long Standstill) .............................................................................................................. 35
7.2 Automatic Restart ............................................................................................................................................... 36
7.3 Checking The Refrigeration Piping Pressure Drops ............................................................................................ 36
7.4 Chilled Water Valve Of Chilled Water (C) Units .................................................................................................. 36
Chapter 8 Operation .......................................................................................................................................................... 38
Chapter 9 Calibrations & Regulation (At Start-Up) ............................................................................................................ 39
9.1 Setting Thermostatic Expansion Valve ............................................................................................................... 39
9.2 Water Leakage Sensor ....................................................................................................................................... 39
9.3 Environment Protection ....................................................................................................................................... 39
Chapter 10 Maintenance & Spare Parts ............................................................................................................................ 40
10.1 Safety Instructions ............................................................................................................................................ 40
10.2 Spare Parts ....................................................................................................................................................... 40
10.3 Maintenance Schedule ..................................................................................................................................... 40
10.4 Air Filter Check Or Substitution ......................................................................................................................... 41
10.5 Condensate Drain And Condensate Pump Systems ........................................................................................ 43
10.5.1 Condensate Drain .................................................................................................................................. 43
10.5.2 Condensate Pump ................................................................................................................................. 43
10.6 Air-Cooled Condenser And Drycoolers ............................................................................................................. 43
10.7 Electrical Heaters .............................................................................................................................................. 43
10.8 Refrigeration Circuit .......................................................................................................................................... 43
10.8.1 Refrigerant Charge Of The Water-Cooled Units .................................................................................... 44
10.8.2 Oil Charge R410A ................................................................................................................................. 44
10.8.3 Oil Topping-Up Of An Installed Circuit ................................................................................................... 44
10.9 Dismantling The Unit ......................................................................................................................................... 44
10.10 Regulation (EC) No. 842/2006 (F-Gas) ........................................................................................................... 45
10.11 Unit Diagnostic ................................................................................................................................................ 46
Appendix 1 Humidair Humidifier ........................................................................................................................................ 47
1. Preface ................................................................................................................................................................. 47
2. Installation ............................................................................................................................................................. 47
3. Humidifier Components ........................................................................................................................................ 49
4. Start-Up And Operation ........................................................................................................................................ 49
4.1 Start-Up ...................................................................................................................................................... 49
4.2 Operation .................................................................................................................................................... 49
5. Maintenance ......................................................................................................................................................... 50
5.1 Removing The Steam Cylinder ................................................................................................................... 50
5.2 Replacing The Steam Cylinder ................................................................................................................... 50
5.3 Annual Maintenance ................................................................................................................................... 50
6. Replacing Humidifier Spare Parts ......................................................................................................................... 51
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Appendix 2 Technical Data Tables .................................................................................................................................... 52
Appendix 3 Installation Drawing ........................................................................................................................................ 55
Appendix 4 Refrigerant, Hydraulic And Electrical Connections ......................................................................................... 59
Appendix 5 Refrigeration & Hydraulic Circuits ................................................................................................................... 64
Appendix 6 Wiring Diagram ............................................................................................................................................... 67
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Chapter 1 Preliminary Operations 1
Liebert.CRV Series Air Conditioner User Manual
Chapter 1 Preliminary Operations
This chapter introduces the preliminary operations of the Liebert.CRV series air conditioner (Liebert.CRV for short),
including inspection, handling, operating limits, noise level limits and product description.
Warning
- Risk of top-heavy unit falling over
Risk of top-heavy unit falling over. Can cause death, injury and equipment damage. Read all of the following instructions before
attempting to move, lift or remove packaging from the unit.
Caution
- Risk of sharp edges, splinters and exposed fasteners
Risk of sharp edges, splinters and exposed fasteners. Can cause personal injury. Only trained personnel wearing appropriate
safety headgear, gloves, shoes and glasses should attempt to move, lift or remove packaging from the unit or prepare the unit for
installation.
Caution
- Risk of overhead interference
Risk of overhead interference. Can damage the unit and structure. The unit may be too tall to fit through a doorway while on the
skid. Measure the unit and doorway heights and refer to the installation plans to verify clearances before moving the unit.
Caution
- Risk of frozen fluids
Risk of frozen fluids. Can cause equipment damage. Keep the unit upright, indoors and protected from dampness, freezing
temperatures and contact damage.
1.1 Inspection
Upon arrival of the unit, and before unpacking it, verify that the delivered equipment matches the bill of lading.
Examine the packaging for any signs of mishandling or damage. Inspect all items for damage, visible or concealed.
Report any damage immediately to the carrier and file a damage claim. Send a copy to Emerson Corporation or to
your sales representative.
1.2 Handling
Always keep the unit vertically upright and do not leave it out in the open.
If possible, transport the Liebert.CRV using a forklift or pallet jack. Otherwise use a crane with belts or cables
and spreader bars to protect the unit’s sides from damage.
If using a forklift or pallet jack, make sure the forks (if adjustable) are spread to the widest distance that fit under
the skid. Also, ensure the fork length is suitable for the unit length.
When moving the packaged unit, do not lift it any higher than 152 mm off the ground. Exercise great care if the
unit must be lifted higher than 152 mm; any personnel not directly involved in lifting the unit must be at least 5m
from the unit.
Take care of the Center of Gravity indicated on the package.
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Liebert.CRV Series Air Conditioner User Manual
Table 1-1 Center of gravity
Model
Distance from corner (unit: m)
x
y
z
X (±0.05m) Y (±0.05m) Z (±0.05m)
CR020 0.52 0.30 0.71
CR035 0.50 0.30 0.80
CR040 0.54 0.30 0.80
Note: The center of gravity on the Liebert.CRV varies with the options and the model’s size
Moving by a forklift and unit weight
The schematic diagram of moving the unit by a forklift is shown in Figure 1-1. The unit weight is given in Table 1-2.
Figure 1-1 Moving the unit by a forklift
Table 1-2 Unit weight (unit: kg)
Model Power supply
Weight (±5%)
Air-cooled Water/Glycol-cooled
Chilled water
CR020 380V ~ 415V/3-phase/50Hz 335 350 CR035 380V ~ 415V /3-phase/50Hz 365 385 CR040 380V ~ 415V /3-phase/50Hz - - 330
Note: Weights of full version units without packaging
1.3 Operating Limits
The units are designed to operate within working ranges (see Table 1-3 ~ Table 1-7). 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.
For all units
Table 1-3 Operating limits for all units
Item From To
Room air
conditions
Temperature 18°C 40°C
Humidity ratio 5.5g/kg 11g/kg
Relative humidity 20% 60%
Storage
conditions
Temperature -20°C 50°C
Power supply
tolerances
Voltage ±10%
Frequency ±2Hz
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Chapter 1 Preliminary Operations 3
Liebert.CRV Series Air Conditioner User Manual
For air-cooled (A) units
Table 1-4 Operating limits for air-cooled (A) units
Item Description
Outdoor
temperature: lower
limit (-20°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 fulfill the
condenser.
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 efficiency loss and dangerous stress for the compressor).
2. Variex fan speed control (the CRV standard outdoor unit has been configured with the function)
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 flow) is necessary to reduce subcooling variations due to
direct wind exposure. (very important to have a good subcooling control).
For all exceptions contact the Emerson sales representative
Outdoor
temperature: higher
limit
This limit is determined by coupled condenser model. Exceeding of this limit (or a lack of maintenance),
will caused a compressor stop by HP safety thermostat. Reset to normal operation can only be carried
out manually.
Once the condensing pressure rises at or above the 34bar / 493psi value, the capacity of the
compressor is reduced by 20% compared to the requested capacity. This because iCOM control tries to
maintain the unit's operability reducing the cooling power of digital scroll
Table 1-5 Relative position of room unit and 50Hz remote condenser
Item Description
From unit to condenser max distance equivalent length1 50m
From unit to condenser max geodetic height2 -8m ~ 30m
Requirements
Pipe diameter
See Table 4-2
Oil traps on vertical line of gas refrigerant
Install one every 6m
Extra oil charge
See Table 5 and Table 6 in the appendix
Note:
1: If the equivalent length from the indoor unit to the condenser exceeds 50m, please consult with Emerson sales representative;
2: Positive difference in height: condenser above conditioner; Negative difference in height: condenser below conditioner
For water/glycol-cooled (W) units
Table 1-6 Operating limits for water/glycol-cooled (W) units
Item Description
Water or mixture temperature to condenser Min. 5°C
Other information See Chapter 5 Water Conections
For chilled water (C) and water/glycol-cooled (W) units
Table 1-7 Operating limits for chilled water (C) and water/glycol-cooled (W) units
Item
Description
CR020RW CR035RW CR040RC
Max. water pressure (bar) 16 16 16
Max. differential pressure through the
closed valve: Dpcv (kPa)
300 300 175
Max. differential pressure across the
valve for modulating service: Dpms (kPa)
300 300 175
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Liebert.CRV Series Air Conditioner User Manual
1.4 Noise Level Limits
The sound pressure level in free field at 1.5m height and 2m in front of the air conditioner, with compressor and fan in
operations, is less than 70dBA for all models (excluding the chilled water unit).
1.5 Product Description
Appearance
The appearance of the air conditioner is shown in Figure 1-2.
Figure 1-2 Appearance of the air conditioner
Example of installation
The Liebert.CRV is a range of full-featured compressorized (air, water, glycol cooled) and chilled water cooling units
to be installed within a row of high density computing racks in a ‘hot-aisle-cold-aisle’ configuration.
The example of high density installation with cold aisle and hot aisle alternation is shown in Figure 1-3.
CR
CR
CR
CR
CR
CR
CR
CR
Hot aisle
Cold aisle
Hot aisle
Hot aisle
Cold aisle
Hot aisle
Cold aisle
Hot aisle
Cold aisle
Hot aisle
Figure 1-3 Example of high density installation with cold aisle and hot aisle alternation
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Chapter 1 Preliminary Operations 5
Liebert.CRV Series Air Conditioner User Manual
Thermal performance
The thermal performance (at 1.1m from floor) of a system with 2 CRV and 20 racks is shown in Figure 1-4.
Figure 1-4 Schematic diagram of thermal performance
Inlet air enters this unit from the hot aisle, is filtered, cooled and conditioned, and is returned to the cold aisle. It
provides all the necessary functions of a standard precision air conditioner, including cooling, heating, humidification,
dehumidification, air filtration, condensate management, temperature control, alarm functions and data
communications. The Liebert.CRV is optimized for maximum cooling capacity in minimal footprint.
iCOM display panel
The iCOM display panel is shown in Figure 1-5.
Figure 1-5 iCOM display panel
The iCOM display panel shows: air inlet temperature and humidity, air outlet temperature, fans status, cooling power
status, next service time.
Component locations
The component locations of Liebert.CRV air-cooled (A), water/glycol-cooled (W) and chilled water (C) units are
shown in Figure 1-6.
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1
2
3
4
8
6
5
9
7
1. iCOM control display 2. Electric Box 3. Evaporator / CW Coil 4. Condensate pump 5. Electric heaters
6. Humidifier distributor 7. Top water connections 8. Drain tray 9. EC fans
Figure 1-6 Component locations
The component locations of Liebert CR020 ~ CR035 air-cooled (A) units are shown in Figure 1-7.
8
1
10
3
4
7
9
2
5
6
1. Termostatic expansion valve 2. Solenoid valve 3. Sight glass 4. Filter dryer
5. Liquid receiver 6. Safety valve 7. Humidity/Temp. sensor 8. Humidifier
9. Top refrigerant connections 10. Bottom refrig. connections
Figure 1-7 Component locations of Liebert CR020 ~ CR035 air-cooled (A) units
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Chapter 1 Preliminary Operations 7
Liebert.CRV Series Air Conditioner User Manual
The component locations of Liebert CR020 ~ CR035 water/glycol-cooled (W) units are shown in Figure 1-8.
2
3
1
4
5
1. Top Water connections 2. Compressor 3. Water condenser
4. Bottom water connections 5. Three-way water valve
Figure 1-8 Component locations of Liebert CR020 ~ CR035 water/glycol-cooled (W) units
The component locations of Liebert CR040 chilled water unit are shown in Figure 1-9.
2
3
1
5
4
1. Top CW connections 2. Filters 3. Three-way CW valve 4. Bottom CW connections 5. Humidifier
Figure 1-9 Component locations of Liebert CR040 chilled water unit
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8 Chapter 2 Unit Positioning
Liebert.CRV Series Air Conditioner User Manual
Chapter 2 Unit Positioning
This chapter provides some ideas of typical installation of the Liebert.CRV unit(s), shows several examples of the
server room layouts and applications using Liebert.CRV units.
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 uniformly across
the rack height, except for the rack closest to the Liebert.CRV unit, where it is suggested to have the higher
density load in the bottom and central part of the rack.
For more details refer to following details or contact Emerson Sales Representative.
1. Placement in the row of racks
For single row application with one Liebert.CRV unit it is not preferred to put the unit in the middle of the row because
of possible hot spots at top part of racks, unless in combination with CoolFlex or in application with more Liebert.CRV
units. The best approach is to place the Liebert.CRV at the end of the row, resulting into much better air distribution.
Please refer to the sample case study comparing the same server room with different Liebert.CRV position. The CFD
(Computational fluid dynamics) analysis results are shown in Figure 2-1 (height 1.8m off the floor for all following
cases).
Good approach:
Not advised approach:
End of row is preferred.
CRV
CRV
Figure 2-1 CFD analysis results of comparing the same server room with different Liebert.CRV position
2. Number of racks / length of the row
Standard application with one Liebert.CRV unit is with 2 ~ 6 racks. The exact number of racks depends on size of
Liebert.CRV unit used and heat load per rack. Whenever applying more than 6 racks for one CRV or heat load more
than 10kW per rack contact Emerson sales representative.
The CFD analysis result of one Liebert.CRV unit with 2 ~ 6 racks is shown in Figure 2-2.
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Chapter 2 Unit Positioning 9
Liebert.CRV Series Air Conditioner User Manual
2 ~ 6 racks (0.6m ~ 5m)
CRV
Figure 2-2 CFD analysis result of one Liebert.CRV unit with 2 ~ 6 racks
3. Placement in the room
1) Width of hot aisle/cold aisle
For good air distribution it is recommended to keep width of the cold aisle as small as possible for single row server
room. Otherwise the cold air discharged by Liebert.CRV unit is being led far from server suction and hot air may
by-passed from hot aisle.
Exceptions where wider cold aisle may be used are: applications with CoolFlex (Cold Aisle Containment) or with two
rows facing each other.
The width of hot aisle/cold aisle is shown in Figure 2-3.
Min. 0.65m
CRV
0.6m ~ 1.2m
Figure 2-3 Width of hot aisle/cold aisle
The CFD analysis result of cold aisle with different width is shown in Figure 2-4.
Not advised approach:
Good approach:
CRV
CRV
< 1.2m
> 1.2m
Note: Please refer to the service area dimensions in Appendix 3.
Figure 2-4 CFD analysis result of cold aisle with different width
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10 Chapter 2 Unit Positioning
Liebert.CRV Series Air Conditioner User Manual
2) Distance between the ends of rows and walls
For single row application with one Liebert.CRV unit it is not preferred to put the unit at wall because of not proper air
paths and possible hot spots at furthest racks, unless in combination with CoolFlex (cold aisle containment) or in
application with more Liebert.CRV units. The best approach is to keep a gap between at least 0.65m or to use more
Liebert.CRV units. Good approach is also having wall at the furthest rack.
Please refer to the following sample case study comparing various Liebert.CRV positions. The CFD analysis result is
shown in Figure 2-5.
CRV
CRV
Min. 0.65m Variable
CRV
Example of an application with gaps on both sides
Not advised approach:
Good approach:
Figure 2-5 CFD analysis result of Liebert.CRV unit in different positions
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Chapter 2 Unit Positioning 11
Liebert.CRV Series Air Conditioner User Manual
As you can see on CFD result above, it is not advised to place Liebert.CRV at the wall in single row layout. On the
contrary, it is not an issue in application with two rows and two or more Liebert.CRV units, as shown in Figure 2-6.
CRV
CRV
0.6m ~ 1.8m
Min. 0.1m
Good approach:
Note: Please refer to the service area dimensions in Appendix 3.
Figure 2-6 CFD analysis result of two rows and two or more Liebert.CRV units
4. Solutions with redundancy
Following an example of more complex applications where N+1 redundancy provided.
Please note the number and size of Liebert.CRV units have to be designed in order to achieve required cooling
capacity if any of the units fails. The other option to easily achieve redundancy is CoolFlex (Cold aisle containment),
see point 5 below.
The CFD analysis result of solutions with redundancy is shown in Figure 2-7.
CRV
CRV
CRV
Off
Example of an application with one row and N+1 redundancy
(right side unit failed).
Example of an application with two rows and N+1 redundancy
(unit placed right down failed).
CRV
CRV
Figure 2-7 CFD analysis result of solutions with redundancy
5. Example of applications with CoolFlex
When high density IT equipment is used (typically over 10kW per rack) or load distribution in the row(s) of racks is not
constant and high energy efficiency is required it is strongly recommended to apply CoolFlex (cold aisle containment)
together with Liebert.CRV.
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12 Chapter 2 Unit Positioning
Liebert.CRV Series Air Conditioner User Manual
Other advantage of the CoolFlex application is less limitations, see above points.
The CFD analysis result of applications with CoolFlex is shown in Figure 2-8.
CRVCRV
CRV
CoolFlex
CoolFlex
Figure 2-8 CFD analysis result of applications with CoolFlex
6. Example of applications with Liebert XD
When high density IT equipment is used (typically over 10kW per rack) with less floor space available especially
when scalable solution is required (starting from less heat load and ready for future grown), the best answer is Liebert
CRV together with Liebert XD system.
Please find following an example layout of typical installation with two rows of racks with Liebert.XDV modules. Two
Liebert.CRV units are used to support the Liebert XD system and to ensure N+1 redundancy on humidity control. See
also CFD result showing site view of the room, as shown in Figure 2-9.
CRV
CRV
XDV
XDV
XDV
XDV
XDV
XDV
XDV
XDV
XDV
XDV
XDV
XDV
Figure 2-9 CFD analysis result of applications with Liebert XD
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Liebert.CRV Series Air Conditioner User Manual
Chapter 3 Unpacking And Installation
This chapter introduces unpacking and installation of the Liebert.CRV air conditioner, including reference guide for
receiving, unpacking, and preparing for installation, recommended unit handling equipment, handling the unit while
packaged, unpacking the unit and installation.
3.1 Reference Guide For Receiving, Unpacking, And Preparing For Installation
Warning
- Risk of top-heavy unit falling over
Risk of top-heavy unit falling over. Improper handling can cause equipment damage, injury or death. Read all of the following
instructions before attempting to move, lift, remove packaging from the unit or prepare unit for installation.
Caution
- Risk of sharp edges, splinters and exposed fasteners
Risk of sharp edges, splinters and exposed fasteners. Can cause personal injury. Only trained personnel wearing appropriate
safety headgear, gloves, shoes and glasses should attempt to move, lift or remove packaging from the unit or prepare the unit for
installation.
Notice
- Risk of overhead interference
Risk of overhead interference. Can cause unit and/or structure damage. The unit may be too tall to fit through a doorway while on
the pallet. Measure the unit and doorway heights and refer to the installation plans prior to moving the unit to verify clearances.
Notice
- Risk of unit damage if improperly stored
Risk of unit damage if improperly stored. Keep the unit vertically upright, indoors and protected from dampness, freezing
temperatures and contact damage.
3.1.1 Equipment Inspection
Upon arrival of the unit, and before unpacking, verify that the labeled equipment matches the Bill of Lading. Carefully
inspect all items for either visible or concealed damage. Damage should be immediately reported to the carrier and a
damage claim filed with a copy sent to Emerson Corporation or to your sales representative.
3.1.2 Packing Material
All material used to package this unit is recyclable. Please save the material for future use, or dispose it appropriately.
3.2 Recommended Unit Handling Equipment
The recommended unit handling equipment is shown in Figure 3-1.
Figure 3-1 Recommended unit handling equipment
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Liebert.CRV Series Air Conditioner User Manual
3.3 Handling The Unit While Packaged
If possible, transport the packaged unit using a fork lift or a pallet jack; otherwise use a crane with slings and
spreader bars.
If using a fork lift or pallet jack, make sure the forks (if adjustable) are spread to the widest allowable distance to
still fit under the pallet. Also, make sure the fork length is suitable for the unit length.
When moving the packaged unit with a fork lift or pallet jack, lift the unit from either end of the pallet.
When handling the packaged unit with a fork lift or pallet jack, the unit shall not be lifted any higher than 51mm ~
102mm) off the ground. All by-standing personnel shall be no closer than 3.7m to the handled packaged unit.
If circumstances require the unit to be lifted higher than 102mm great care shall be exercised and all by-standing
personnel are to be no closer than 5m to the lift point of the unit.
3.4 Unpacking The Unit
Move the product to the place closest to the final installation site before unpacking the unit.
Follow the procedures below to unpack the unit:
1. Removing the side boards and top cover.
1) CRV series air conditioner uses the international packaging. You can use a hammer or straight screwdriver to
straighten the connection hook between the side boards and top cover, as shown in Figure 3-2.
Figure 3-2 Straighten the hook
2) As shown in Figure 3-3, at first, straighten all the hooks that fix the side boards, and remove the four side boards.
At last remove the top cover.
Side panel
Top cover
Figure 3-3 Remove the side boards and top cover
2. Remove the cushion (see Figure 3-4) from the unit, exposing the bag over the unit. The bag may remain in place
for dust and panel protection, or removed for immediate unit installation.
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Chapter 3 Unpacking And Installation 15
Liebert.CRV Series Air Conditioner User Manual
Cushion
Figure 3-4 Remove the cushion
3. CRV series air conditioner is fixed onto the pallet with M8 × 45 bolts, as shown in Figure 3-5. You can use an M10
open-end spanner, a ratchet spanner or a sleeve to remove the screws.
Pallet fixing
bolts (4 pcs)
Figure 3-5 Remove the pallet fixing bolts
4. Using the unit castors, at least two trained persons can move the unit to the site for installation, as shown in
Figure 3-6.
Figure 3-6 Move the unit
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Liebert.CRV Series Air Conditioner User Manual
3.5 Installation
1. Open the unit panel, follow the procedures as below:
1) Opening the front up panel, the serial number of the unit for service is revealed. See ‘a’ in Figure 3-7.
a
Figure 3-7 Serial number of the unit
2) Using a screwdriver open the electrical panel and the front down panel to prepare installation, as shown in
Figure 3-8.
Open the electrical panel Open the front down panel
Figure 3-8 Open the electrical panel and the front down panel
3) Using the keys (‘b’ in Figure 3-9) open the electrical panel and the down panel on the rear.
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Chapter 3 Unpacking And Installation 17
Liebert.CRV Series Air Conditioner User Manual
b
Figure 3-9 Open the electrical panel and the down panel on the rear
2. When the unit is on site, to lock it, adjust the four base supports with a ‘24’ key. Turning them the unit will be lift. It’s
very important that unit has to be horizontal, because, in other cases, condensed water is not able to come out
completely (possibility of malfunctions, corrosions and hygienic problems). Finally lock the top bolts (‘c’ in
Figure 3-10).
c
Figure 3-10 Lock the top bolts
3. Connect the unit as described in below paragraphs: refer to Chapter 4 Refrigeration Connections for units’ type A
and W; refer to Chapter 5 Water Connections for all units; refer to Chapter 6 Electrical Connections for all units.
4. Before start-up, adjust the frontal panel baffles to give right air flow direction, as shown in Figure 3-11. This
operation is very important to obtain the maximum efficiency from Liebert.CRV unit and to prevent rack’s overheating
in the system. For any doubt contact Emerson service people.
Figure 3-11 Adjust the frontal panel baffles
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Liebert.CRV Series Air Conditioner User Manual
1) Baffles have always to direct air flow up, as shown in Figure 3-12.
Figure 3-12 Direct air flow up
2) Turn the baffles (if necessary) to direct right or left the air flow, in Figure 3-13.
1. Remove the screws (one on left and one on right) 2. Disassemble only the wrong baffles
3. Rotate around a horizontal axle to adjust direction 4. Reassemble and lock the screws
Figure 3-13 Turn the baffles
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Chapter 4 Refrigeration Connections 19
Liebert.CRV Series Air Conditioner User Manual
Chapter 4 Refrigeration Connections
This chapter introduces refrigeration connections of the Liebert.CRV air conditioner, including refrigeration pipeline
connections for air-cooled (A) units, vacuum creation and refrigerant charge, and refrigeration circuits.
Warning
Use only condenser unit design for R410A refrigerant.
The unit is designed both from top and bottom side.
4.1 Refrigeration Pipeline Connections For Air-Cooled (A) Units
The refrigeration pipeline connections on unit top and bottom are shown in Figure 4-1.
Top refrigeration pipeline connections
Bottom refrigeration pipeline connections
(If you are using bottom ones, de-braze pipes across square dot line and
remove pipes to the top of the unit. Then braze new pipes to bottom.)
Figure 4-1 Refrigeration pipeline connections
The air condensing units are delivered with nitrogen pressurized at 2bar.
Warning
The discharge operation of the room unit pressurized with nitrogen (at 2bar) and the de-brazing of the bottoms from the
connections must be carried out as last operations, immediately followed by the connection and emptying of the whole system.
4.1.1 General Layout
The recommended pipe layout is shown in Figure 4-2, and the No. descriptions are as follows:
①: In soft or hard copper. The diameter required is stated in Table 4-2. If the installer intends to use pipes of a larger
diameter (e.g. for long winding runs) then consult Emerson services. Use refrigeration pipelines which are as short as
possible to minimize the total charge of refrigerant and the pressure drops. Lay the horizontal gas pipes with 1%
downward gradient towards the refrigerant flow.
②: Reduce the number of bends, which must be of large radius, to a minimum.
③: Insulate the piping as specified in Table 4-1. If the pipes are put next to electrical cables it is advised to insulate
them to avoid damage to cable insulation.
④: There must be a minimum separation of 20mm between the gas and liquid pipelines. If this is not possible insulate
both lines.
⑤: Support both horizontal and vertical pipes with vibration-damping clamps (which include rubber gaskets). Place
these every 1.5m ~ 2m.
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Liebert.CRV Series Air Conditioner User Manual
Figure 4-2 Recommended pipe layout
The condenser positioning is given in Table 4-1.
Table 4-1 Condenser positioning
Item
Condenser positioning
Condenser above indoor unit
Condenser and indoor unit at
the same level
Condenser below indoor unit
(not recommended)
Insulation
Gas inlet Necessary Necessary Necessary
Gas outlet Only for aesthetic reasons Only for aesthetic reasons Only for aesthetic reasons
Liquid inlet Absolutely not Not necessary No (expose to cold underfloor air)
Liquid outlet Only for aesthetic reasons Only if exposed to sun Only if exposed to sun
Layout
6m*
(See Table 1-5)
Note*: Oil traps every 6m of
vertical piping.
Indoor unit
Liquid
Gas
Indoor unit
Liquid
Gas
Indoor unit
(See Table 1-5)
Liquid
Gas
4.1.2 Pipe Diameter And Thickness
Warning
The diameters and thickness of the connecting pipes between the conditioner and the condensing unit listed in Table 4-2 must
be respected for safety reasons (we are managing the R410A refrigerant) and otherwise the guarantee becomes invalid.
2
1
3
4
5
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Chapter 4 Refrigeration Connections 21
Liebert.CRV Series Air Conditioner User Manual
Table 4-2 Pipe diameters (Indoor unit to condenser)
Model
External diameter x minimum thickness (mm)
Gas Liquid
CR020RA 19 × 1.2 16 × 1
CR035RA 22 × 1.2 19 × 1.2
Note: the diameters in the table is standard pipe dismeters (invalid for equivalent lengths up to 50m)
4.1.3 Installing Pipelines
The following operations must be carried out by an experienced refrigeration technician.
Warning
The discharge operation of the room unit pressurized with nitrogen (at 2bar) and the de-brazing of the bottoms from the
connections must be carried out as last operations, immediately followed by the connection and emptying of the whole system.
1. Lay the piping, taking note of the following:
1) Brazing:
All joints must be braze-brazed.
Avoid butt brazes by using sleeves or enlarging one of the pipes using a pipe opener.
Use silver-based solders and the correct apparatus.
Guarantee a correct braze as a refrigerant leak, or a faulty braze which leads to a leak later on, can seriously
damage the air conditioner.
2) Always use large-radius curves (bending radius at least equal to pipe diameter). Bend the pipes as follows:
Soft copper: by hand or bending device.
Hard copper: use preformed curves. Do not overheat the pipes when brazing so as to minimize oxidation.
2. Connect the pipes to the condenser:
1) Condensers with butt-brazed pipe connections: cut the pipe, enlarge it and braze it to the pipeline.
2) Condensers with threaded tap connections: flange the pipes and connect.
Note: respect the direction of refrigerant flow (see labels on refrigerant connections).
3. Wash out the pipelines as follows:
1) Plug up the free ends of the pipes.
2) Connect a helium or nitrogen cylinder, fitted with a reducer (max. pressure 10bar), to the ¼" SAE Schrader cock of
the condenser.
3) Pressurize the pipes with helium or nitrogen.
4) Unplug the pipes instantaneously.
5) Repeat 1) - 4) several times.
Note: This operation is especially important when hard copper piping is used.
4. Open all the room unit shut-off valves.
5. Discharge the room unit pressurized with nitrogen (at 2bar) opening the charge cocks so that all the branches of
the circuit are discharged (e.g. on the receiver, on the low pressure side and on the compressor delivery).
6. De-braze the bottoms from the connections of the room unit.
7. Fix (braze) the pipes to the connections on the air conditioner.
8. Connect the refrigerant safety valve to the outdoor with a 16mm copper pipe.
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Liebert.CRV Series Air Conditioner User Manual
The equivalent lengths of curves, shut-off valves and check valves are listed in Table 4-3.
Table 4-3 E
quivalent lengths of curves, shut-off valves and check valves
Nominal
diameter
E
quivalent lengths
90°
curve
45°
curve
180°
curve
90°
shut-off valve Check valve
12mm 0.50m 0.25m 0.75m 2.10m 1.90m
14mm 0.53m 0.26m 0.80m 2.20m 2.00m
16mm 0.55m 0.27m 0.85m 2.40m 2.10m
18mm 0.60m 0.30m 0.95m 2.70m 2.40m
22mm 0.70m 0.35m 1.10m 3.20m 2.80m
4.2 Vacuum Creation And Refrigerant Charge
Warning
1. Check the refrigerant type to be used on the data plate of the air conditioner and on the refrigerating compressor.
2. Poor quality or counterfeit refrigerant will damage the system seriously. For the system abnormality, fault or damage caused
by using poor quality or counterfeit refrigerant, Emerson Network Power Co., Ltd. will not assume the warranty responsibility.
Pump and refrigerant charging cylinder connection for vacuum creation and refrigerant charge is shown in Figure 4-3.
R.L.
10
10a
11
11a
14
12
10b
Figure 4-3 Pump and refrigerant charging cylinder connection
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Chapter 4 Refrigeration Connections 23
Liebert.CRV Series Air Conditioner User Manual
Suction and supply line connection for vacuum creation is shown in Figure 4-4.
Figure 4-4 Suction and supply line connection for vacuum creation
Liquid line connection for vacuum creation is shown in Figure 4-5.
Figure 4-5 Liquid line connection for vacuum creation
Connection after thermostatic valve for vacuum creation and refrigerant charge is shown in Figure 4-6.
Figure 4-6 Connection after thermostatic valve
4.2.1 R410A Precharge For Air-Cooled (A) Units
1. Open all cocks of the system including those used for pressurizing (ambient unit and condensing unit).
By this operation all the components of the refrigerating circuit must be subject to vacuum.
2. Connect a proper, high efficiency vacuum pump (10) suitable for polyester oils to the couplings:
Compressor intake and delivery using, if available, the three-way Rotalock cocks, coupling 1/4” SAE (make sure
that all three ways are open), otherwise the Schrader valves brazed on the pipings.
Coupling 1/4” SAE of the liquid receiver (12).
Coupling 1/4” SAE of the evaporator coil (14).
3. Provide for a connection with refrigerant cylinder before making vacuum.
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Liebert.CRV Series Air Conditioner User Manual
4. Make the system vacuum up to 0.3mbar (absolute) and after 3 hours check if 1.3mbar (absolute) have not been
exceeded. This condition warrants the humidity lower than 50ppm inside the system. If the complete vacuum is not
possible, this means that there are some leaks (to be removed according to the instructions in 6 below).
Never use the compressor to create a vacuum (this invalidates its guarantee).
5. Break the vacuum as follows:
1) Close the cock (10a) for the vacuum pump (10).
2) Open the cock of the refrigerant cylinder (11a) until the system reaches a pressure value of about 1 bar. Repeat
this procedure using a Schrader valve on high pressure side near liquid receiver.
Warning
The refrigerant must be introduced and charged by taking only liquid fluid from the cylinder.
3) At this point both the vacuum pump and the refrigerant cylinder can be disconnected as follows:
Close the cylinder cock (11a).
Close the way 1/4" SAE of the Rotalock cocks and of the connected Schrader valves.
6. Inspect all connections/joints using a leak detector. If a leak is found, empty the pipes and the condenser, seal the
leak and repeat the instructions in 3 ~ 6.
7. Now the machine is ready for completing the charge and the start-up.
8. Charge the refrigerant (only liquid) by means of the charge valve placed at the evaporator inlet.
4.2.2 Refrigerant Charge For Air-Cooled (A) Units
1. Start the unit as described in 7.1 First Start-up (Or After Long Standstill).
2. Manually start the compressor at 100% modulation (ensure the unit is not in the dehumidification phase).
3. Guarantee a constant condensation temperature (preferably 45°C); if necessary, partially obstruct the condenser
coil surface or limit its ventilating power to obtain these conditions.
4. Charge the unit until the working conditions of the entire refrigeration circuit have become normal.
5. Using a manometer to measure the suction pressure and calculate the evaporating temperature, check that the
evaporating temperature is above 0°C.
6. Verify that the superheat is 5K ~ 8K (refer to 9.1 Setting Thermostatic Expansion Valve).
4.3 Refrigeration Circuits
Refer to Appendix 5 Refrigeration & Hydraulic Circuit.
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Chapter 5 Water Connections 25
Liebert.CRV Series Air Conditioner User Manual
Chapter 5 Water Connections
This chapter introduces water connections of the Liebert.CRV air conditioner, including general warning, water
connections, chilled water connections for water/glycol-cooled (W) units and chilled water (C) units.
The options for water connections are listed in Table 5-1.
Table 5-1 Options for water connections
Options Top connections Down connections
Condensate pump Available choice Available choice
Nothing (drain only) No Single choice
Condensate pump must be selected and used for top connection of water pipes of the unit. Top connections: ‘e’ in
Figure 5-1 is the position of supply and drain water connection for all types unit. ‘f’ is the position of supply and drain
water connection for the chilled water (C unit) or cooling water (W unit).
f
e
Figure 5-1 Supply and drain water connection
5.1 General Warning
If the tubing is to run outdoors, add glycol to the circuit as described in Table 5-2.
Table 5-2 Glycol to be added to water
Item
Percentage in weight of total mixture added to water
0% 10% 20% 30% 40%
Freezing
temperature
Glycol* 0°C -5°C -11°C -18°C -27°C
Propylene glycol
0°C -3°C -7°C -14°C -
Note*:
Values are for Shell antifreeze 402. For different brands check manufacturer’s data
Notes:
To avoid stratification run the circulation pump for at least 30min. after adding any glycol.
After adding water to the water circuit, disconnect the unit from the sanitary water piping system; in this way the
water mixed with glycol won’t return into the same piping system.
After any topping-up of water check the glycol concentration and add any glycol if necessary.
The hydraulic features of the system vary by adding glycol. Therefore check the head and the flow rate of the
pump to be used.
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Liebert.CRV Series Air Conditioner User Manual
5.2 Water Connections – Supply Humidifier And Drain Water (All Units)
Units with condensate pump are pre-set to be connected from the top. If it’s to use floor connections the water lines
can be intercepted in the points shown in Figure 5-2.
Figure 5-2 Points for intercepting water lines
The schematic diagram of condensate drain without pump is shown in Figure 5-3, take the following procedures:
Use galvanized steel, PVC or flexible polythene tubing.
Allow a 2% gradient towards the drain.
There must be a drain trap ① placed at least 20 cm/8” below the drain tray ②. The drain trap must be placed
under the unit, in the false floor.
Fill the drain trap with water ③.
Bracket
(2 pcs)
2
3
1
Min. 20cm
Min. 10cm
To be connected
by user
Note:
1. Do not cut the bracket of this drain trap or
the draining of the condenser will be affected.
2. Fill the drain trap with water before startup
to avoid spraying condensate.
3. To avoid water leakages, use teflon tape
between flexible tube and connections.
Figure 5-3 Condensate drain
For humidifier (optional), refer to Appendix 1 Humidair Humidifier.
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Chapter 5 Water Connections 27
Liebert.CRV Series Air Conditioner User Manual
5.3 Chilled Water Connections For Water/Glycol-Cooled (W) Units
For rear bottom cooled water condensed connections, see Figure 5-4.
Figure 5-4 Rear bottom cooled water condensed connections
The unit must receive cooling water as follows:
1. From an external cooling water source, in open circuit (see Figure 5-6).
2. Using a Dry cooler, in closed circuit (see Figure 5-7).
Connect the piping by reference to Appendix 4 Refrigerant, Hydraulic And Electrical Connections.
It is advisable to use hoses to be connected, with 3-piece joints, to the condenser water inlet and outlet
couplings.
Install a 16 ~ 20 mesh strainer on the chilled water supply to the Liebert.CRV. The strainer is needed to prevent
particles in the chilled water from entering the heat exchanger of the Liebert.CRV.
Place shut-off ball valves at the conditioner inlet and outlet to allow easy maintenance.
It is advisable to install a water drain system at the lowest point in the circuit.
Fully drain the piping before connecting it to the air conditioner.
5.3.1 Notes For Open Circuit Applications
Use the unit with mains or well water. Do not use water from an evaporative cooling tower unless the filling water
hardness is controlled.
The water pressure must be 2bar ~ 10bar (if this is not so, contact the technical support department).
The required water flow at different temperatures is given in our catalogues or on request.
If necessary (very low water temperature) insulate both pipes using Armaflex insulation.
5.3.2 Notes For Closed Circuit Applications
The installation in Figure 1-8 is indicative only; for individual installations follow the project diagram.
Install a pump system calculated on the basis of the flow and total head of the system (see project data), and
controlled by the compressor running.
Insulate both pipes using Armaflex insulation.
Very important: Add water and ethylene glycol to the circuit, when the ambient temperature is below zero. Do not
exceed the nominal operating pressure of the circuit components.
Bleed air out of the circuit.
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Liebert.CRV Series Air Conditioner User Manual
5.4 Chilled Water Connections For Chilled Water (C) Units
The positions for chilled water connections are shown in Figure 5-5.
Top chilled water connections Rear bottom chilled water connections
Figure 5-5 Positions for chilled water connections
The chilled water circuit is shown in Figure 5-6, as described below:
Use copper or steel (Mannesmann) tubing.
Place the tubing on supporting saddles ①.
Insulate both tubes using Armaflex insulation ②.
Place shut-off ball valves ③ at the conditioner inlet and outlet to allow easy maintenance.
It is useful to install a thermometer ④ and a manometer ⑤ at the conditioner inlet and outlet.
Install a water drain tap ⑥ at the lowest point in the circuit.
Fill the circuit with water/glycol.
Air
conditioner
①
②
③
④
⑤
⑥
Figure 5-6 Chilled water circuit
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Chapter 5 Water Connections 29
Liebert.CRV Series Air Conditioner User Manual
It is advised to install the dry cooler following Figure 5-7.
Air
conditioner
TSHTC
Stand-by pump
Disconnect after charge
Filling
water
(Option)
HTC
TS
Shut-off valve
Pump
Check valve
Thermostat
Variex (option)
Safety valve
Expansion tank
Air separator
Filling meter
Drain (at lowest point)
Pressure-operated
by-pass
Manometer
Charge group (filter, reducer, check valve)
Figure 5-7 Schematic diagram of installing d
ry cooler
For detailed parameters, refer to Appendix 4 Refrigerant, Hydraulic And Electrical Connections.
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Chapter 6 Electrical Connections
This chapter introduces electrical connections of the Liebert.CRV air conditioner, including cable entry ports, routing
cables, connection procedures, protective features of EC fans and electrical heaters, and placement of the
temperature probes.
6.1 Cable Entry Ports, Routing Cables And Connection Procedures
The cable entry ports of Liebert.CRV are shown in Figure 6-1, in which ‘g’ is the cable entry port for low voltage signal
cable, ‘h’ is the cable entry port for power supply cable.
h
g
h
g
Bottom cable entry ports Top cable entry ports
Figure 6-1 Cable entry ports of Liebert.CRV
Use cable ties to fix high and low voltage wires to plastic clamps, and route cables following the arrow direction
shown in Figure 6-2.
Route cables from the bottom Route cables from the top
Figure 6-2 Route cables
The procedures of electrical connections are as follows:
1. Before proceeding with the electrical connections, ensure that:
1) All electrical components are undamaged;
2) All terminal screws are tight;
3) The supply voltage and frequency are as indicated on the unit.
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Liebert.CRV Series Air Conditioner User Manual
2. Power supply cable connections:
1) Connect the cable to the Line inlet terminal board;
2) Use the cable size defined according to the flow, the supply voltage and the installation type;
3) Protect the supply using a back-up fuse;
4) Do not fit the supply cable in the raceways inside the machine electric board;
5) Use multipolar cables with sheath (CEI20-22) only.
3. Wiring connections:
1) Connections for remote on-off must be done by the installer;
2) The General Alarm terminals allow remote alarm signaling.
4. In case of short circuit, check the sticking of the involved switch and possibly replace it.
5. During start-up and maintenance, it is possible to connect a remote display on the rear side of the unit. Inside the
compressor/chilled water valve compartment, there are two cables (supply and Ethernet) available for connecting, so
to manage all the parameters like front iCom display. For part numbers and specification, refer to Appendix 6 Wiring
Diagram.
For electrical data, refer to Appendix 2 Technical Data Tables.
6.2 Protective Features Of EC Fans
The locations of the EC fans are shown in Figure 6-3.
Figure 6-3 EC fans
The EC fans have been provided with the following protective features:
Over temperature of electronics
Over temperature of motor
Locked rotor protection
Short circuit at the motor output
With any of these failures, the motor stops (electronically-no potential separation), the status relay is released. NO
automatic restart. To reset the alarm, power supply has to be switched off for min. 20s once motor is at standstill.
Mains under-voltage detection
If mains voltage falls below 3ph/290Vac (typical value) for 5s minimum, motor will be switched off (only by electronics,
no potential separation), status relay is released.
If mains voltage returns to correct values, the motor will restart automatically.
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Liebert.CRV Series Air Conditioner User Manual
Phase failure recognition
If one phase failes for 5s minimum, motor will be switched off (only by electronics, no potential separation), status
relay is released. If all 3 phases return to correct values, the motor will restart automatically within 10s ~ 40s.
The power supply for an external speed setting potentiometer is short-circuit protected.
Motor is overload-protected via motor current limitation.
Warning: Leakage current of the motor is 7mA roughly.
6.3 Protective Features Of Electrical Heaters
The electrical heaters with temperature sensor protection are shown in Figure 6-4.
Figure 6-4 Electrical heaters with temperature sensor protection
In case of over temperature of electrical heating, the temperature sensor checks it and the thermal protection turns off
the current. To reset the thermal protection push the bottom in front of the unit as indicated in Figure 6-5.
Figure 6-5 Resetting button
6.4 Temperature Probes Placed On Racks
Each unit is provided with at minimum three temperature probes (standard feature) and they can be up to ten. They
are located inside the unit, behind rear door (access to the fans panel rotating the three locks with the black key).
The sensors may be placed where desired or left coiled inside the unit. It is recommended that the sensor be routed
to the front of the heat load for the most accurate temperature reading. If the sensor is left inside the unit, ensure the
sensor and cable do not rest against the compressor or refrigerant lines. Doing so may damage the sensor. In sensor
chain configuration (see Figure 6-6), each temperature sensor monitors the temperature of the air entering the rack
equipment. The reading is used to control the operation of the unit. A standard position is at 1.5m in height, so the
sensor must be placed as shown in Figure 6-6, or the equipment will not operate properly.
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Chapter 6 Electrical Connections 33
Liebert.CRV Series Air Conditioner User Manual
SENSOR CHAIN
1500 (59 in)
1500 (59 in)
1500 (59 in)
1.5m
1.5m
1.5m
Figure 6-6 Sensor chain configuration
Insert the rack temperature sensor connector in the temperature sensor port (CAN port as shown in Figure 6-7) at the
iCom interface. After cabling like shown in pictures to exit from the top or from the bottom of the unit, connect to first
probe, then from first to second one, from second to third one and so on, like a chain. Secure the temperature sensor
in front of the warmest heat source in the enclosure. Do not secure in front of a blanking panel. For this operation use
the support provided for each probe (see Figure 6-8). The sensors must be installed where lack of sufficient cooling
air is most likely. Due to air flow behavior (see Chapter 2 Unit Positioning), sometimes it would be better to
reconsider the layout, or particular attention must be taken positioning the sensors.
BOTTOM INLET
(possible with raised floor)
TOP INLET
FRONT VIEW
Top inlet
Bottom inlet (possible
with raised floor)
Front view
Cable connection of first sensor
Amplified
CAN port
Figure 6-7 Connection of temperature sensor
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Liebert.CRV Series Air Conditioner User Manual
Figure 6-8 Use provided support to fix each probe
Sensor chain–CAN termination
The CAN Bus of sensor chain needs to be terminated. If a CAN device is the last component in the CAN Bus, the
termination jumper has to be set to pin 2 and pin 3. If a CAN device is in the middle between other CAN devices, no
termination has to be set, the jumper remains on pin 1 and pin 2.
To connect the temperature probes to use only cable with these characteristics:
6 wires, 3 couples, shielded twisted pair
Termination: RJ12
3 × 2 × 0.14mm2 (min), twisted pairs, shielded
Plenum rated
300V
-5°C ~ +70°C
Flexible
Characteristic impedance of between 108Ohm and 132Ohm@50kHz
Conductor resistance < 150Ohm/km
Flame retardant
Black jacketing
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Chapter 7 Start-Up 35
Liebert.CRV Series Air Conditioner User Manual
Chapter 7 Start-Up
This chapter introduces start-up of the Liebert.CRV air conditioner, including first start-up (or after long standstill),
automatic restart, checking the refrigeration piping pressure drops, and chilled water valve of chilled water (C) units.
7.1 First Start-Up (Or After Long Standstill)
Warning
To prevent compressor damage, the crankcase(s) must be preheated for at least 4 houes before conditioner start-up (failure to
do so invalidates the guarantee).
Start the air conditioner as follows:
1. Open all valves in the refrigeration circuit according to the instruction label attached to the valve.
2. Water-cooled unit only: Open all valves in the water circuit according to the instruction label attached to the valve.
3. Ensure that the refrigerant charge is correct (see Chapter 4 Refrigeration Connections).
4. Using a leak detector, verify that there are no refrigerant leaks. If there are any, then repair the leak and recharge
as described in Chapter 4 Refrigeration Connections.
5. At least 4 hours before start-up, close the main switch and the compressor switch on the electrical panel.
In the ‘iCom’ control system factory setting the stand alone mode is standard. The stand alone mode gives the
possibility of turning on the unit simply rotating the main switch on the electric panel. The yellow LED on the iCom
case will light after turning on the unit, because of the presence of electric power.
If the LED does not light up:
Check the electric panel power supply;
Check the protection devices (e.g.: thermal switches);
Check the fuses.
6. Verify the operation of the crankcase heater.
7. Check that there are no water leakages.
8. If an external condenser or Dry cooler is installed, start it by supplying power to it.
9. Close all MCBs on the electrical panel.
10. Check the supply voltage on all phases.
11. Check the supply voltage on all phases for the external condenser or Dry cooler, if fitted.
12. Ensure that the compressor has been preheated for at least 4 hours before starting the unit.
13. Start the unit by pressing ON/OFF.
14. Check the electrical absorption of all components (see Chapter 6 Electrical Connections).
15. Check the electrical absorption of the external condenser/Dry cooler, if fitted.
16. Important: If the compressor makes a loud and unusual noise, it is necessary to invert the electrical connections
of the phases supplying the corresponding scroll compressor, which accepts only one direction of rotation.
17. Ensure that the fans rotate in the correct direction (see arrow on fan).
Caution: risk of contact with rotating devices.
18. Ensure that all control system settings are correct and that there are no alarms.
19. Water-cooled unit only: Verify the water flow.
20. Water-cooled unit only: For closed circuit units ensure that the water pump starts when the compressor starts.
21. Once the system is operating under load, check the various components, as follows:
Verify that the fans are operating properly.
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Liebert.CRV Series Air Conditioner User Manual
Ensure that the temperature and relative humidity are being controlled, and that the humidifier and heating steps
operate when required.
Ensure that the compressor operates when required.
Ensure that the fan operation controller on the external condenser/Dry cooler (if fitted) is calibrated correctly, and
that it controls the fan operation.
7.2 Automatic Restart
If desired, the unit will automatically restart on the return of power after a supply interruption. If the power interruption
is expected to be of several hours, to avoid an automatic cold restart of the compressor stop the unit before the
black-out and, on the return of power, allow the compressor to preheat before restarting the unit.
7.3 Checking The Refrigeration Piping Pressure Drops
Liebert.CRV is equipped with connections to check the refrigeration piping pressure drops: room unit → condenser
→ room unit.
To carry out this operation it is necessary to use two calibrated manometers and connect them as follows:
M1 is connected to the compressor delivery valve; M2 is connected to the Schrader valve (2) in Figure 7-1.
1
2
3
4
5
6
1. Liquid receiver valve 2. Filter dryer inlet Schrader valve 3. Filter dryer
4. Sight glass 5. Solenoid valve 6. Thermostatic expansion valve
Figure 7-1 Components of refrigeration pipeline
When the compressor is running, you should check M1 and M2.
Note: Repeat this test, inverting the manometers to calculate the correct pressure drops, consider the average value
of the two readings.
At 45°C, the refrigeration pipeline pressure drops (Dp bar) are as follows:
At the same geodetic level: Dp (bar) = M1 - M2
When condenser is above the room unit: Dp (bar) = M1 - M2 + geodetic difference (m x 1.1:10.2)
When condenser is below the room unit: Dp (bar) = M1 - M2 - geodetic difference (m x 1.1:10.2)
7.4 Chilled Water Valve Of Chilled Water (C) Units
The three-way valve controls the chilled water flow and operates as follows (Figure 7-2):
When the valve is fully open (i.e. max. chilled water flow), the actuator slot is set to ‘1’.
When the valve is closed (i.e. no chilled water flow), the actuator slot is set to ‘0’.
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Liebert.CRV Series Air Conditioner User Manual
Position indicator on
0 = CLOSED valve
(3-way valve: by-pass open)
Position indicator on
1 = OPEN valve
(3-way valve: by-pass closed)
0
1
0
1
Position indicator on 0:
closed valve (three-way
valve: by-pass open)
Position indicator on 1:
open valve (three-way
valve: by-pass closed)
Figure 7-2 Position of the chilled water valve actuator (for two-way or three-way valve)
Note:
1. In the unlikely event of control system failure, the valve can be manually controlled by means of the rotary knob. It
can be used to drive the actuator into any position between 0 and 1.
2: When actuator stem is completely down, the valve is open and chilled water coil is supplied.
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Liebert.CRV Series Air Conditioner User Manual
Chapter 8 Operation
Unit operation is completely automatic. This chapter explains how the unit operates.
1. The air, sucked in by the fans, which operate continuously, enters the unit.
2. The air is immediately filtered.
3. The temperature sensor or temperature & rel. humidity sensor (check type installed, see Figure 8-1 for its position),
verifies the state of the inlet air, and relays this information to the control system.
Figure 8-1 Sensor position
4. The treated air is then dispersed out of the unit.
5. 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:
Cooling
Direct expansion mode (DX)
The compressor is started and the cold refrigerant flows through the evaporator, thus cooling the air passing over it.
Chilled water mode (CW)
The three-ways valve is opened and the chilled water flows through the coil, thus cooling the air passing over it.
Heating
Electrical heating (optional): the heating elements heat the air passing over them. There is one heating steps activate
in case of dehumidification if supply air temperature is too low.
Dehumidification
Under the DX mode, the compressor starts and the air flow on the evaporator surface is reduced (increasing
modulation capacity of compressor), thereby causing dehumidification.
Note: If, during dehumidification, the ambient temperature drops below a specified level, dehumidification will be
stopped if necessary.
In dehumidification mode, the air after passing over the coil it’s reheated (if needed) by electrical heater to re-stabilize
the initial temperature.
Humidification
The humidifier creates steam, which is distributed into the air stream via the steam distribution pipe, refer to
Appendix 1 Humidair Humidifier.
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Chapter 9 Calibrations & Regulation (At Start-Up) 39
Liebert.CRV Series Air Conditioner User Manual
Chapter 9 Calibrations & Regulation (At Start-Up)
The air conditioner has already been tested and calibrated in factory, but it is very important to check, at start-up, the
superheating of thermostatic valve (A/W versions).
The air conditioner has already been tested in factory.
For calibrations of instruments installed on the external condensers/dry coolers refer to the relevant manual.
For control system calibrations refer to Control manual (to prevent erratic operations do not use temperature and
rel. humidity set points/proportional bands which differ excessively from the standard settings).
9.1 Setting Thermostatic Expansion Valve
This operation must be performed by an experienced refrigeration technician.
The valve has been factory preset and, if necessary, should be reset as follows:
1. Important: ensure that the instructions in Chapter 4 have been carried out.
2. Allow the compressor to operate for 15 minutes.
3. Measure the superheat as follows:
1) Place a contact thermometer on the tube exiting the evaporator.
2) Connect a manometer to the compressor suction valve.
3) The overheating is the difference between the refrigerant saturation temperature corresponding to the pressure
read on the manometer and the real temperature read on the thermometer.
4. The superheat must be 5K ~ 8K; if not, set the expansion valve as follows:
1) Remove the protective cover.
2) Turn the adjustment screw by 1/4 turn only.
3) Wait 10 minutes.
4) Measure the superheat and repeat the operation if necessary.
Note: If the superheat is too low, the screw must be turned in a clockwise direction. If the superheat is too high, the
screw must be turned in a counterclockwise direction.
9.2 Water Leakage Sensor
Due to high flooding alarm device sensitivity, to the end to avoid undesirable alarm signal because of few sporadic
water drops, place the sensors at a minimum distance of 50cm from the unit base perimeter.
This solution assures alarm intervention for real flooding risk only.
9.3 Environment Protection
A misuse or an incorrect calibration of the unit leads to increased energy consumption, resulting in an economic and
environmental damage.
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Liebert.CRV Series Air Conditioner User Manual
Chapter 10 Maintenance & Spare Parts
This chapter introduces maintenance & spare parts of the Liebert.CRV air conditioner, including safety instructions,
spare parts, maintenance schedule, air filter check or substitution, condensate drain and condensate pump systems,
air-cooled condenser and drycoolers, electrical heaters, refrigeration circuit, dismantling the unit, regulation (EC) No.
842/2006 (F-gas), and unit diagnostic.
10.1 Safety Instructions
All maintenance operations must be carried out strictly observing the European and national accident prevention
regulations. We refer especially to the accident prevention regulations concerning electrical systems, refrigerators,
and manufacturing resources. Maintenance may be done to air conditioning equipment only by authorized and
qualified technicians.
To keep all warrantees valid, the maintenance must adhere to the manufacturer's regulations.
Warning
The work should be done in the system only when it is at standstill. Do this by switching off the air conditioner at the controller
and the main switch. Post a warning sign saying: ‘Do not switch on.’ Electrical components of device have to be switched off and
be checked that they are not under voltage.
Ignoring the safety instructions can be dangerous to persons as well as to the environment.
Soiled parts always cause a loss of performance and for switch or control devices can lead to the break-down of a
plant.
10.2 Spare Parts
Only original spare parts made by Emerson Network Power may be used. Using third-party material can invalidate
the warrantee.
Note:
1. When a faulty component is replaced, follow the relevant manufacturer instructions.
2. When the spare parts must be brazed, be carefully do not damage the internal parts (gaskets, seals, o-rings, etc.).
10.3 Maintenance Schedule
Monthly, quarterly, biannual and annual checks must be conducted according to the following guidelines.
All tasks and periods listed in Table 10-1 are regulations from the manufacturer and need to be documented in an
inspection report.
Warning
All these tasks should be carried out only by an authorized and trained technician. We recommend the Emerson Network Power
Customer Service.
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Chapter 10 Maintenance & Spare Parts 41
Liebert.CRV Series Air Conditioner User Manual
Table 10-1 Maintenance schedule
Components
Maintenance period
Monthly quarterly biannual annual
General
Check unit display for clogged-filter warning ×
Check for irregular noise from unit fans ×
Check for irregular noise from compressor ×
Check for irregular noise from remote condenser fan/s (if
applicable)
×
Filters
Check state of filters ×
Replace air filter whether necessary ×
Filter switch functionality check ×
Blowers
Verify impellers move freely ×
Check bearings ×
Check motor mounts for tightness ×
Check fan safety switch ×
Electrics/electronics
Check condition of contactors ×
Check electrical connections ×
Check operation of controller ×
Check unit operation sequence ×
Steam generating
humidifier
Check cylinder & pan ×
Check steam hoses conditions ×
Verify filling solenoid valve proper operation ×
Cooling water circuit
(W and C units)
Circuit leakage/general condition check ×
Check water(-glycol) inlet temperature ×
Check water regulating valve operation ×
Check in/out water(-glycol) t ×
Check mixture glycol level (if applicable) ×
Refrigerating circuit
Check compressor noise/vibrations ×
Check oil level through compressor sight glass ×
Adjust/tighten compressor/functional elements ×
Check sight glass for problem detection ×
Check starting/running amps ×
Check refrigerating circuit main pressures ×
Check compressor suction superheat ×
Check discharge temperature ×
Check sub cooling ×
Air cooled
condenser/dry cooler
(if applicable)
Check fan/s bearings ×
Check fan/s motor mounts for tightness ×
Check coil condition ×
Check pipelines supports ×
Check fan/s speed controller operation ×
Water/glycol pump
(if applicable)
See relevant manual
10.4 Air Filter Check Or Substitution
Every month it’s important to check the state of air filter to maintain a good efficiency of air distribution throw the
evaporator coil.
First switch off the CRV, then open the rear panel with the key, access to the fan panel rotating the three locks with
the black key. Wait until fans are stopped (when you open the first lock, you also open a security switch that cut the
current, see Figure 10-1).
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Liebert.CRV Series Air Conditioner User Manual
Figure 10-1 Security switches of the fans
To extract the filters, push up the upper one and rotate it. Then move the other one up and repeat as before, as
shown in Figure 10-2.
Figure 10-2 Extract the filters
After cleaning or replacing the filter, before reassembly, check that the position of air differential pressure switch pipes
(clogged filter alarm) would be in right position and in right order.
Check also that the drain trays would be clean and the pipe fix. The air differential pressure switch pipes and
condensate drain pipe are shown in Figure 10-3.
Figure 10-3 Air differential pressure switch pipes and condensate drain pipe
Before re-start the unit, be sure that micro-switches are properly closed. Otherwise the unit maintains a safety status.
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Liebert.CRV Series Air Conditioner User Manual
10.5 Condensate Drain And Condensate Pump Systems
10.5.1 Condensate Drain
Check and clear obstructions in tubing during routine maintenance.
10.5.2 Condensate Pump
The position of the condensate pump is shown in Figure 10-4.
Figure 10-4 Condensate pump
Clean the condensate pump following the procedures below:
1. Disconnect power to unit using disconnect switch.
2. Check and clear obstructions in gravity lines leading to condensate pump.
3. Remove sump and clean with a stiff nylon brush and flush with water.
4. Inspect and clear clogs in discharge check valve and float mechanism.
5. Reassemble and check for leaks.
10.6 Air-Cooled Condenser And Drycoolers
The cleaning procedures are as follows:
1. Clear coil surface of all debris that will inhibit airflow.
2. Check for bent or damaged coil fins and correct.
3. Do not permit snow to accumulate around or under outdoor unit.
4. Periodically consider commercial cleaning of coil surface.
5. Inspect fans, motors and controls for proper operation.
6. Check all piping and capillaries for proper support.
7. Inspect for leaks.
10.7 Electrical Heaters
The cleaning procedures are as follows:
1. Inspect and clean reheat elements.
2. Inspect and tighten support hardware.
10.8 Refrigeration Circuit
When repairing the refrigeration circuit, collect all refrigerant in a conditioner, do not allow it to escape.
When either removing (for repairs) or charging refrigerant this must always be done on both the high and low
pressure sides of the compressor simultaneously.
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Liebert.CRV Series Air Conditioner User Manual
The compressor copper plated steel connections should be brazed with a silfos material containing a minimum of 5%
silver.
10.8.1 Refrigerant Charge Of The Water-Cooled Units
1. Start the unit as described in 7.1 First Start-Up (Or After Long Standstill).
2. Manually start the compressor (ensure the unit is not in dehumidification).
3. Wait a few minutes to allow conditions to stabilize.
4. Check the refrigerant circuit using a leak detector. If there is a leak, recharge the unit until the working conditions of
the entire refrigeration circuit have become normal.
5. Using a manometer, check that the evaporating temperature is above 0°C.
6. Verify the water pressostatic valve (WV) setting (refer to Chapter 7 Start-Up).
7. Verify that the superheat is 5K ~ 8K, refer to Chapter 9 Calibrations & Regulation (At Start-Up).
10.8.2 Oil Charge R410A
The oil to be used when topping up (only if there are any leaks) is EMKARATE RL 32-3MA or Mobil EAL Arctic 22CC
(see Table 10-2 and Table 10-3).
Table 10-2 EMKARATE RL 32-3MA oil
Item Description
Viscosity at 40°C 31.2cSt
Viscosity at 100°C 5.6cSt
Viscosity index (ISO Grade) 32
Table 10-3 Mobil EAL Arctic 22CC oil
Item Description
Density (at 15 °C) 0.967kg/l
Flash point (C.O.C.) 245°C
Pour point < -54°C
Viscosity at 40°C 23.6cSt
Viscosity at 100°C 4.7cSt
Viscosity index (ASTM D2270) 130
These oils rapidly absorb the humidity present in the air when they are exposed to the atmosphere.
If the oil absorbs humidity, the ester molecules can break down, forming acidity.
We therefore recommend exposing the oil for as short a time as possible (no more than a few minutes) and, in case
of topping up, using exclusively the oil indicated on the refrigerating compressor.
Normally 1-litre or 2-litre cans are available for this purpose; once they are opened, they must be completely used up.
They must not be used after a long period, as they absorb humidity.
It is therefore obvious that the taps of the compressor must only be turned after the whole plant has been subjected
to a vacuum and partial filling.
10.8.3 Oil Topping-Up Of An Installed Circuit
If oil leakages occur, the topping-up operation is necessary. Contact the local service before intervention.
10.9 Dismantling The Unit
The machine has been designed and built to ensure continuous operation.
The working life of some of the main components, such as the fan and the compressor, depends on the maintenance
that they receive.
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Liebert.CRV Series Air Conditioner User Manual
Warning
The unit contains substances and components hazardous for the environment (electronic components, refrigerating gases and
oils). At the end of the useful life, when the unit is dismantled, the operation must be carried out by specialized refrigerating
technicians. The unit must be delivered to suitable centers specialized for the collection and disposal of equipment containing
hazardous substances.
The refrigerating fluid and the lubricating oil inside the circuit must be recovered according to the laws in force in the
relevant country.
To recover the gas, use all the connections described in 4.2 Vacuum Creation And Refrigerant Charge.
10.10 Regulation (EC) No. 842/2006 (F-Gas)
Stationary air conditioning placed into the European Community market and operating with fluorinated greenhouse
gases (f-gas), such as R410A, R134a, R410A, they have to comply with the F-gas Regulation (applied since 04 July
2007).
Be aware that refrigerants as R22 are not f-gas and their relevant regulation is Reg. (EC) no. 2037/2000.
Following notes have to be considered when operating with the above mentioned equipments.
1. Fluorinated greenhouse gases are covered by the Kyoto Protocol.
2. The fluorinated greenhouse gases in this equipment should not be vented to the atmosphere.
3. Referring to the value noted in Annex I of Regulation (EC) No 842/2006. Here below the global warming potential
(GWP) of some major f-gases: R-134a: 1300; R-407C: 1610; R-410A: 1890.
4. Operators of the above mentioned applications, which contain fluorinated greenhouse gases, shall, using all
measures which are technically feasible and do not entail disproportionate cost:
1) Prevent leakage of these gases and as soon as possible repair any detected leakage.
2) Ensure that they are checked for leakage by certified personnel.
3) Ensure for putting in place arrangements for the proper recovery by certified personnel.
4) In case of applications containing 3 kg (6kg in case of hermetically sealed system) or more of f-gases: certified
personnel and companies (according to Reg. 303/2008) provides regular leak testing (according to Reg. 1516/2007
and Reg. 1497/2007) and maintain records of maintenance activities in a dedicated log book.
5) Recovery for the purpose of recycling, reclamation or destruction of the fluorinated greenhouse gases, pursuant to
Art.4 (Recovery) of Reg.842/2006, shall take place before the final disposal of that equipment and, when appropriate,
during its servicing and maintenance.
5. Operator, according to Reg. 842/2006, Article 2, point 6, means the natural or legal person exercising actual power
over the technical functioning of the equipment and system covered by the Regulation. The State may, in defined,
specific situations, designate the owner as being responsible for the operator's obligations.
6. Direct methods of leakage checking approved by the manufacturer (Reg. 1516/2007 and Reg. 1497/2007).
1) Gas detection device adapted to the refrigerant in the system; the sensitive of portable gas detection devices (as a
direct test method) shall be at least five grams per year.
2) Proprietary bubble solutions/soapsuds.
7. Additional information located into a dedicated label of unit (Reg. 1494/2007).
1) Where fluorinated greenhouse gas is foreseen to be added to the equipment outside of the manufacturing site at
the point of installation, a dedicated label accommodates notation of both the quantity (kg) pre-charged in the
manufacturing plant and of the quantity charged at the installation site as well as the resulting total quantity of f-gas
as a combination of the above mentioned quantities, in a manner which conforms to the legibility and indelibility. Our
split units are usually not pre-charged on factory, in this case the total quantity of refrigerant charged in the unit has to
be written in the relevant label, during the commissioning operation at the installation site.
2) Our packaged units (not split) operating with f-gas are usually full charged on factory and the total amount of
refrigerant charge is already reported on the label. In this case, the label has no need of further written information.
3) In generally, the above mentioned information has been located in the main nameplate of relevant unit.
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Liebert.CRV Series Air Conditioner User Manual
4) For equipment with double refrigeration circuits, in regards to differentiates requirements on the basis of the
quantity of f-gas contained, the required information about refrigerant charge quantities has to be listed separately for
each individual circuit.
5) For equipments with separate indoor and outdoor sections connected by refrigerant piping, the label information
will be on that part of the equipment which is initially charged with the refrigerant. In case of a split system (separate
indoor and outdoor sections) without a factory pre-charge of refrigerant, the mandatory label information will be on
that part of the product or equipment which contains the most suitable service points for charging or recovering the
fluorinated greenhouse gas(es).
8. Safety data sheets of f-gases used into the products are available on demand.
10.11 Unit Diagnostic
The possible cause and corrective action of the unit problem are listed in Table 10-4.
Table 10-4 Unit diagnostic
Problem Possible cause Corrective action
Racks temperature is too high
Dirty filters Replace filters
False filter clogs Call Emerson services
Incorrect positioning of remote
temperature sensor(s)
Verify remote temperature sensors correct
positioning
Remote temperature sensor(s) issue Call Emerson services
Too high condensation pressure
(A units) verify remote condenser fans are
running
(W units) check cooling water supply
(W units) check cooling water temperature
Call Emerson services
(C unit) inlet water temperature is too high Check cooling water temperature
Refrigerating circuit charge issue Call Emerson services
Cold air short-circuiting issues
Verify unit positioning/room configuration
Verify unit air-baffles set-up
Verify cold aisle containment seals (if applicable)
Insufficient room cooling capacity Reduce racks heat load or add cooling units
(C unit) water regulating valve issue Call Emerson services
Unit safety devices intervention Call Emerson services
Unit fan fail to start The fan is faulty Call Emerson services
Water drops carried by airflow
Room humidity is over acceptable limit Check room condition
Condensate pan drain is clogged Call Emerson services
Problem to humidifier control Call Emerson services
Water on the floor around the
unit
Unit is not properly levelled Adjust the levelling feets
Unit condensate drain pipe is clogged Remove pipe obstruction
(C and W units) leak in the water circuit Locate the leak and fix it
Piping insulation broken/damaged Restore insulation integrity
Leak in the draining circuit Call Emerson services
Condensate pump is faulty Call Emerson services
Leak in the humidifier filling hose Call Emerson services
Cooling unit noise level is too
high than expected
Incorrect positioning of remote
temperature sensors
Verify temperature sensors correct positioning
Unbalanced heat load distribution Enhance racks heat load distribution
Remote temperature sensor(s) issue Call Emerson services
Unsteady air delivery
temperature
Faulty temperature sensor Call Emerson services
Unit controller issue Call Emerson services
Local display not operational
but unit operates
Local display cable disconnected Connect the cable
Local display cable damaged Replace cable
Local display configuration lost Call Emerson services
Local display not operational
and unit does not operate
Unit electrical supply is off Restore electrical supply
Unit main switch is off Switch on the unit
Control board supply issue Call Emerson services
Control board issue Call Emerson services
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Appendix 1 Humidair Humidifier
1. Preface
The unit adopts humidair humidifier technology, guaranteeing the steam as clean as possible together with simple
maintenance.
In order to obtain optimum performance from the humidair it is advisable to read this manual carefully.
The specifications of the humidair humidifier are listed in Table 1.
Table 1 Specifications of the humidair humidifier
Air conditioner
model
Humidair
model
Main power
supply (±10%)
Setting
(kg/h)*
Absorbed
current (A)
Power
(kW)
Max. cylinder
water
volume (L)
Max. supply
water quantity
(L/min)
Max. drain
water quantity
(L/min)
CR020RA/W
KUECLA 230V/1ph/50Hz 0.6 ~ 2.0 6.5 1.5 1.7 0.6 4.0 CR035RA/W
CR040RC
Note*: Unit is factory-set to produce about 70% of the maximum value
2. Installation
The humidifier is supplied already mounted within the air conditioner. The only necessary operations are the
connections for the supply water (see Figure 1) and drain water (see Figure 2).
A
B
Water supply
Supplying limit
Cut-off tap
Must be included in the
supply water tubing.
Supply water tubing
It is supplied a 1.5m long
plastic tube, with 1/2"Gm
connections.
Supply water features:
The supply water temperature must never exceed 40 C.
The supply water pressure must be between 0.3bar ~ 6bar.
If greater, use a pressure reducing valve set to 3bar ~ 4bar.
Sanitary water should be used. Do not use demineralized
water or water containing impurities.
Conductivity range: 125μS/cm ~ 1250μS/cm.
Alternative supply water
tubing
Unscrew the ring nut A and
connect a tube straight to
the 3/4" male connection B
on the humidifier.
Figure 1 Supply water connection
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Liebert.CRV Series Air Conditioner User Manual
Water drain tubing
It is supplied a hose with an integral drain trap.
Do not dismantle the drain trap.
The hose is already fitted onto the humifier
drain outlet (K).
Fill the drain trap with water (L).
The drain pipe is made of plastic material
which does not conduct electricity.
L
K
Note:
1. Do not cut the bracket of this drain trap or
the draining of the condenser will be affected.
2. Fill the drain trap with water before startup
to avoid spraying condensate.
3. To avoid water leakages, use teflon tape
between flexible tube and connections.
Drain water device
Dispose the drain water into an
ordinary drainage network, using
a funnel (the drainage network
must be able to withstand water
temperatures up to 100℃).
Figure 2 Drain water connection
Notes:
1. Allow a 2% gradient towards the drain outlet.
2. Avoid back pressures in the drain piping.
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Appendix 1 Humidair Humidifier 49
Liebert.CRV Series Air Conditioner User Manual
3. Humidifier Components
The components of the humidair humidifiers are shown in Figure 3.
Supply valve
P
U
L
Y
Z
C
R
V V
T
G
D
N
F
E
A
O
F
H
S
Water supply
Supply valve (F)
Filling
cup
Overflow
tube
Drain tank
Drain valve
Steam outlet
From supply
valve to interface
From humidifier
power electrodes
to electrical supply
Level electrode
Power electrodes
Steam cylinder
Water drain
outlet
From supply
valve to interface
From level sensor
to interface
Drain valve assembly (D)
Figure 3 Humidifier and its connections
4. Start-Up And Operation
4.1 Start-Up
Before using the humidifier, check the following:
Supply and drain connections.
That the cut-off tap is open.
All wiring.
Earthing.
Steam hose connection between steam cylinder and distributor.
To start the humidifier simply switch on the air conditioner, which will in turn automatically start and stop the humidifier
as required. The (adjustable) parameters which determine humidifier operation have already been factory-preset (see
iCom manual).
4.2 Operation
Water, provided it contains even a small quantity of salts in solution, is a conductor of electricity. Therefore, if the
steam cylinder is filled with water and a potential difference is applied between the electrodes, the water behaves like
an ordinary electrical resistance and becomes hot, thus creating steam. The steam production rate can be controlled
Page 60
50 Appendix 1 Humidair Humidifier
Liebert.CRV Series Air Conditioner User Manual
by varying the water level in the cylinder; the higher the water level, the deeper the electrodes are immersed into it
and the greater the steam production.
Note:
1. In case of low water conductivity, consult Emerson services.
2. When starting with an empty cylinder, the water conductivity is normally insufficient for the humidifier steam output
to be reached immediately. Therefore the humidifier produces as much steam as possible to fill the cylinder
completely. Any evaporation water is immediately refilled. The drain valve is kept shut and therefore, as the steam
does not contain any salts, the conductivity of the water within the cylinder slowly increases until the humidifier steam
output is obtained. The length of the start-up period depends upon the water conductivity. For very conductive water it
may occur that the humidifier steam output is obtained immediately.
5. Maintenance
5.1 Removing The Steam Cylinder
To remove the steam cylinder, proceed as follows (see Figure 3):
1. Open the general switch relative to the humidifier.
2. Drain all the water from the cylinder by activating ‘HUM. DRAIN’ in the control service menu several times.
3. Disconnect the steam hose (S) (made of non-conductive rubber).
4. Disconnect the power electrode wires (P) and level sensor wire (L).
5. Undo the clip (R).
6. Pull the cylinder (C) out of its gland at the bottom (G).
5.2 Replacing The Steam Cylinder
When the steam cylinder is approaching the stage where it needs to be replaced, warning A25 is generated to advise
the user that the cylinder must be replaced. To replace the cylinder, proceed as follows (see Figure 3):
1. Carry out the instructions in 5.1 Removing The Steam Cylinder.
2. Using the new cylinder, carry out procedures 4 ~ 6 in 5.1 Removing The Steam Cylinder in reverse order.
3. Connect the steam hose (S); the clip on the hose needs to be tightened only slightly.
4. Manually switch the humidifier on for 2 ~ 3 minutes (in the iCom service menu). Then switch it off.
5. Drain the water as for procedure 2 in 5.1 Removing The Steam Cylinder.
6. If the air conditioner features an iCom CDL with Graphic display, reset the humidifier working hours (window no. 1
of parameter menu) to zero.
7. Close the general switch relative to the humidifier.
5.3 Annual Maintenance
Annually carry out the following service on the humidifier (see Figure 3):
1. Carry out the instructions in 5.1 Removing The Steam Cylinder.
2. Disconnect the supply (F) and drain (D) valve wires.
3. Unscrew and remove the drain tank (T).
4. Unscrew the drain valve assembly screws (V).
5. Remove the drain valve assembly.
6. Unscrew and remove the drain valve solenoid (O).
7. Unscrew and remove the drain valve armature (D).
8. Clean all parts of the drain valve using a commercially available descaling agent (to remove any incrustations).
9. Detach the hose from the supply valve.
10. Remove the supply valve connection (N).
Page 61
Appendix 1 Humidair Humidifier 51
Liebert.CRV Series Air Conditioner User Manual
11. Unscrew the supply valve (F) and remove it.
12. Clean the supply valve using a jet of water.
13. Replace any hose which has become hard and brittle.
14. Thoroughly flush the drain line (E).
15. Reassemble the humidifier by carrying out the above instructions in reverse order.
Attention: always empty the cylinder completely before any close-down period.
6. Replacing Humidifier Spare Parts
When replacing the humidifier spare parts, it is recommended the use of original spare parts. When placing an order,
please contact Emerson services.
Page 62
52 Appendix 2 Technical Data Tables
Liebert.CRV Series Air Conditioner User Manual
Appendix 2 Technical Data Tables
Table 2 Electrical data of the unit (compliant with CE)
Configuration Model Power supply FLA (A) LRA (A)
Residual current
circuit breakers
I△n = 0.3A (400V)
Cooling
Fan + compressor
CR020
380V ~ 415V/3N/50Hz
22.3 107 40A Curve C
CR035 28.0 121 50A Curve C
Cooling + electrical heating
(dehumidification)
Fan + compressor +
electrical heaters
CR020
380V ~ 415V/3N/50Hz
31.0 116 50A Curve C
CR035 36.7 130 63A Curve C
Cooling + humidification
Fan + compressor +
humidifier
CR020
380V ~ 415V/3N/50Hz
31.0 116 50A Curve C
CR035 36.7 130 63A Curve C
Cooling
Fan
CR040 380V ~ 415V/3N/50Hz
3 3 10A Curve C
Cooling + electrical heating
Fan + electrical heaters
CR040 380V ~ 415V/3N/50Hz
11.7 11.7 20A Curve C
Cooling + Humidification
Fan + humidifier
CR040 380V ~ 415V/3N/50Hz
9.5 9.5 20A Curve C
Note:
1. Without condensate pump option.
2. The cables have to be sized in compliance with local standards and according to the type and characteristics (e.g. Amperes)
of installation
Table 3 Electrical data of components (compliant with CE)
Component
Unit power supply Model OA1 (A) FLA2 (A) LRA2 (A)
Nominal
power (kW)
Fan 380V ~ 415V/3N/50Hz
CR020 2 × 1.95 2 × 3.1 2 × 0.1 2 × 0.30
CR035 2 × 0.85 2 × 1.5 2 × 0.1 2 × 0.53
CR040 2 × 1 2 × 1.5 2 × 0.1 2 × 0.63
Compressor 380V ~ 415V/3N/50Hz
CR020 11.13 16.1 101 5.99
CR035 16.70 25.0 118 9.34
Humidifier 380V ~ 415V/3N/50Hz
CR020 6.5 6.5 - 1.50
CR035 6.5 6.5 - 1.50
CR040 6.5 6.5 - 1.50
Electrical
heater
380V ~ 415V/3N/50Hz
CR020 8.7 8.7 - 6
CR035 8.7 8.7 - 6
CR040 8.7 8.7 - 6
Condensate
pump
380V ~ 415V/3N/50Hz
CR020 - 1.2 - -
CR035 - 1.2 - -
CR040 - 1.2 - -
Note*:
1: At nominal operating condition: condensing temperature is 48.9°C, inlet air temperature is 37.8°C, inlet air relative humidity is
20%RH.
2: FLA: Max operating current; LRA: locked rotor Amps
Page 63
Appendix 2 Technical Data Tables 53
Liebert.CRV Series Air Conditioner User Manual
Table 4 Calibrations of electrical components
No. Component Setting Notes Contact
1 High pressure transducer
Range: 0 ~ 45barg
Output: 0 ~ 5V
See iCom manual
-
2 Low pressure transducer
Range: 0 ~ 17.3barg
Output: 0 ~ 5V
See iCom manual
-
3 High pressure switch (HP)
Stop: 37.0 ± 1barg
Start: 30.0 ± 1.5barg
(Fixed setting – manual reset)
Reset
Normally closed
4
Clogged filter differential
pressure switch (CF)
Set point range: 0.5mbar ~
4mbar
Filter G4 = 2mbar
Setting
ring
Normally closed
Table 5 R410A refrigerant and oil charge for air cooled models (A type)
Model
Base
refrigerant
charge (kg)
Base oil charge*
(oil within compressor, kg)
Max. system refrigerant
charge before oil
addition (kg)
Weight of oil to add for every
4.5kg of refrigerant over Max.
system charge (g)
Initial oil charge Max. topping up
CR020RA
5.9 1.68 1.57 17.1 44.8
CR035RA
10 3.08 2.97 12.6 112.0
Note*:
The recommended oil is EMKARATE RL 32-3MA
Table 6 Refrigerant charge of pipeline for air cooled models
External pipe diameter
(mm)
R410A gas（kg/m）
At different condensing temperatures, R410A liquid* (kg/m)
35°C 46°C 57°C
12 × 1 - 0.08 0.07 0.07
16 × 1 0.0169 0.16 0.14 0.13
19 × 1.2 0.0221 0.20 0.19 0.17
22 × 1.2 0.0346 - - -
28 × 1.2 0.0584 - - -
Note*:
Liquid pressure and density varies according to condensing temperature
The distance of pipeline for air cooled models is shown in Figure 4.
Air conditioner
Condenser
a
b
c
Pipeline from conditioner to air condenser
Distance (D) = a + b + c
Figure 4 Distance of pipeline
Page 64
54 Appendix 2 Technical Data Tables
Liebert.CRV Series Air Conditioner User Manual
Table 7 Refrigerant and oil charge for water cooled models (W type)
Model R410A refrigerant charge (kg) Initial oil charge* (kg)
CR020RW 6.5 1.68
CR035RW 11 3.08
Note*:
The recommended oil is EMKARATE RL 32-3MA
Note: The air conditioner is supplied complete with refrigerant and oil.
The detailed sound data of the Liebert.CRV are listed in Table 8.
Table 8 Sound data of Liebert.CRV
Fan speed
(%)
Airflow Octave band frequency(Hz)
Sound
level
(dBA)
Unit SPL
suction
(2m from
front, dBA
）
SCFM m3/h Level 31.5 63 125 250 500 1000 2000 4000 8000
CR020 air cooled models
100 2454 4170 PWL 73.8 69.4 71 77.3 75.9 74.2 73.5 68.2 59.2 79.6 69.2
75 2166 3680 PWL 71.2 66.8 68.4 74.7 73.3 71.6 70.9 65.6 56.6
77 66.9
55 1780 3025 PWL 67.6 63.2 64.8 71.1 69.7 68 67.3 62 53 73.4 63.9
CR035 air cooled models
100 3260 5540 PWL 76 76.2 80.5 82.7 77.3 73.1 74.5 69 61.9 80.9 70.0
75 2708 4600 PWL 71.3 71.5 75.8 78 72.6 68.4 69.8 64.3 57.2 76.2 65.7
55 2048 3480 PWL 66.3 66.5 70.8 73 67.6 63.4 64.8 59.3 52.2 71.2 61.9
CR040 water cooled models
100 3325 5650 PWL 86.4 78.1 82.4 84.6 79.2 75 76.4 70.9 63.8 82.8 71.6
75 2708 4600 PWL 80.8 72.5 76.8 79 73.6 69.4 70.8 65.3 58.2 77.2 66.0
55 1972 3350 PWL 75.1 66.8 71.1 73.3 67.9 63.7 65.1 59.6 52.5 71.5 60.3
Note: PWL is sound power level; SPL is sound pressure level
Page 65
Appendix 3 Installation Drawing 55
Liebert.CRV Series Air Conditioner User Manual
Appendix 3 Installation Drawing
2000
Front view
600
7
5
1
1
7
5
Figure 5 Dimensions of the air conditioner (unit: mm)
1
2
4
5
1
2
4
5
Figure 6 Front and back service area (unit: mm)
Page 66
56 Appendix 3 Installation Drawing
Liebert.CRV Series Air Conditioner User Manual
350
650 700
650
1175
550
2725
100
100
600
700
B
S
S
A
Service area is S + B or S + A
Figure 7 Service area (top view, unit: mm)
Page 67
Appendix 3 Installation Drawing 57
Liebert.CRV Series Air Conditioner User Manual
Unit area
1
1
7
5
6
0
0
1175
4490
52
234
195.5
80
324.5
600
55.5
544.5
55
31.5
154.5 414
130
Dimensions of the unit area
Front view
Figure 8 Dimensions of the raised floor for piping and electrical connections (unit: mm)
Page 68
58 Appendix 3 Installation Drawing
Liebert.CRV Series Air Conditioner User Manual
Air bleeding valve
A
A amplified
Figure 9 Position of the air bleeding valve for chilled water models (rear view)
Bottom inlet (possible with raised floor)
Front view
Top inlet
Amplified figure
Figure 10 Cable inlet for electrical connections
Page 69
Appendix 4 Refrigerant, Hydraulic And Electrical Connections 59
Liebert.CRV Series Air Conditioner User Manual
Appendix 4 Refrigerant, Hydraulic And Electrical Connections
Rear view
EC-HV
EC-LV
HF
DP
OG
IL
IL
EC-LV
HF/HD
EC-HV
OG
Top connections
600
44
83 440
77
1175
69 242
45
127
69 237
130
69
74
56 54
83
28
247.5
324.5
225.5
76.5
98
55.5
35
97
199
CD or DP
Bottom connections (possible with raised floor)
Figure 11 CR020RA, CR035RA connections (unit: mm)
Table 9 Refrigerant and hydraulic connections for air cooled units
Unit connection CR020RA CR035RA
IL Refrigerant liquid line inlet OD 12.7mm CU sweat OD 16 mm CU sweat
OG Refrigerant gas line outlet OD 16mm CU sweat OD 22mm CU sweat
CD
Condensate drain
Attention: with pump, CD is connected with HD, see DP
ID 20mm
HF Humidifier feed
12.7mm GAS-F for top connections,
19mm GAS F for bottom connections
HD
Humidifier drain
Attention: with pump, CD is connected with HD, see DP
ID 22mm
DP Pump drain 12.7mm GAS F
EC-HV Electrical supply – high voltage Hole, Φ63mm
EC-LV Electrical supply – low voltage Hole, Φ28mm
Page 70
60 Appendix 4 Refrigerant, Hydraulic And Electrical Connections
Liebert.CRV Series Air Conditioner User Manual
Rear
view
155
105
EC-HV
EC-LV
HF
DP
OWC
IWC
IWC
EC-LV
HF/HD
EC-HV
OWC
Top connections
83
440
77
69 237
1175
69 242
45
127
600
56
54
83
Bottom connections (possible with raised floor)
69
74
76.5
98
28
247.5
324.5
44130
225.5
35
97
199
55.5
CD or
DP
Figure 12 CR020RW, CR035RW connections (unit: mm)
Table 10 Refrigerant and hydraulic connections for water cooled units
Unit connection CR020RW CR035RW
IWC Water to condenser inlet 32mm GAS F 32mm GAS F
OWC Water from condenser outlet 32mm GAS F 32mm GAS F
CD
Condensate drain
Attention: with pump, CD is connected with HD, see DP
ID 20mm
HF Humidifier feed
12.7mm GAS-F for top connections,
19mm GAS F for bottom connections
HD
Humidifier drain
Attention: with pump, CD is connected with HD, see DP
ID 22mm
DP Pump drain 12.7mm GAS F
EC-HV Electrical supply – high voltage Hole, Φ63mm
EC-LV Electrical supply – low voltage Hole, Φ28mm
Page 71
Appendix 4 Refrigerant, Hydraulic And Electrical Connections 61
Liebert.CRV Series Air Conditioner User Manual
155 105
44083 77
237
69
242
69
1175
127
45
600
83
54
56
EC-LV
EC-HV
HF
DP
OCW
ICW
225.5
247.5
324.5
28
ICW
OCW
HF/HD
74
69
76.5
98
97
35
199
55.5
CD or DP
EC-LV
130
44
Rear view
Top connections
Bottom connections (possible with raised floor)
Figure 13 CR040RC connections (unit: mm)
Table 11 Refrigerant and hydraulic connections for chilled water units
Unit connection CR040RC
ICW Chilled water inlet 32mm GAS F
OCW Chilled water outlet 32mm GAS F
CD
Condensate drain
Attention: with pump, CD is connected with HD, see DP
ID 20mm
HF Humidifier feed
12.7mm GAS-F for top connections,
19mm GAS F for bottom connections
HD
Humidifier drain
Attention: with pump, CD is connected with HD, see DP
ID 22mm
DP Pump drain 12.7mm GAS F
EC-HV Electrical supply – high voltage Hole, Φ63mm
EC-LV Electrical supply – low voltage Hole, Φ28mm
Page 72
62 Appendix 4 Refrigerant, Hydraulic And Electrical Connections
Liebert.CRV Series Air Conditioner User Manual
9
13 6 12
10
X1
0
62
24
105
121
106
24
51
128
0
0
29
24
121
121
125
127
126
401
400
300
402
302
3015019
X1.1
29
5152535354
054
55
73
22
G07071
72
828384
Y2
63
81
61
61
Wire bridge
24
2400
815
710
710
7
11
1
3
5
2
4
395
16
Figure 14 Electrical board layout (50Hz)
Electrical field connecions descriptions (50Hz)
1. Standard electrical connections
1) Primary high voltage entrance - 64mm; 44mm; 35mm diameter concentric knockouts located in bottom of the box.
2) Secondary high voltage entrance - 64mm; 44mm; 35mm diameter concentric knockouts located in top of the box.
3) Primary low voltage entrance - Quantity: 3, 28mm diameter knockouts located in bottom of the unit.
4) Secondary low voltage entrance - Quantity: 3, 28mm diameter knockouts located in top of the box.
5) Earth ground - Terminal for field supplied earth grounding wire.
6) Remote unit shutdown - Replace existing jumper between terminals 52 & 53 with field supplied normally closed
switch having a minimum 75VA, 24Vac rating. Use field supplied Class 1 wiring.
Page 73
Appendix 4 Refrigerant, Hydraulic And Electrical Connections 63
Liebert.CRV Series Air Conditioner User Manual
7) Customer alarm inputs - Terminals for field supplied, normally closed contacts, having a minimum 75VA, 24VAC
rating, between terminals 61 & 63. Use field supplied Class 1 wiring.
8) General alarm - On any alarm, normally open dry contact is closed across terminals 400, 401 for remote indication.
2A, 24Vac Max. load. Use Class 1 field supplied wiring.
9) Warning alarm - On any alarm, normally open dry contact is closed across terminals 300,301 for remote indication.
2A, 24Vac Max. load. Use Class 1 field supplied wiring.
10) Compressor motor on - On any call for compressor operation, normally open dry contact is closed across
terminals 72 & 73, 2A, 24Vac Max. load. Use Class 1 field supplied wiring.
11) Fan motor on - On any call for fans operation, normally open dry contact is closed across terminals 70 & 71. 2A,
24Vac Max. load. Use Class 1 field supplied wiring.
2. Optional electrical connections
12) Smoke sensor alarm (with smoke sensor option) – The smoke sensor is factory installed, and senses the delivery
air; it is connected across terminals 61 & 62 and send a visual and an audible alarm. This smoke sensor is not
intended to function as, or replace, any room smoke detection system that may be required by local or national codes.
1A, 24Vac Max. load. Use Class 1 field supplied wiring.
14) Condensate alarm (with condensate pump option) - On pump high water indication, normally open dry contact is
closed across purple wire for remote indication install inside the box near the pump. 1A, 24Vac Max. load. Use Class
1 field supplied wiring.
3. Optional low voltage terminal package connections
15) Flooding alarm (liquistat) – The flooding alarm detects the presence of water and activate an alarm. The sensor is
connected across terminals 105 & 106 and up to five sensors can be connected to the same flooding alarm device to
control many points in the bottom of the unit.
4. Electrical connections for maintenance
16) Switch mode power supply – 220Vac input, 12Vdc output. It can supply power for remote large display panel. The
switch is off by default, and can only be used during maintenance. When maintaining the unit, the maintenance
personnel can connect a large display panel to the unit rear part. Through the display panel, all functions of the
controller can be used, facilitating maintenance. After the maintenance, please switch off the switch mode power
supply.
Page 74
64 Appendix 5 Refrigeration & Hydraulic Circuits
Liebert.CRV Series Air Conditioner User Manual
Appendix 5 Refrigeration & Hydraulic Circuits
18
6
14
12
(On CR035 only)
2
1
MC
15
17
External on CR020
18
12
11
6
19
19
12
5
6
6
7
8
9
16
10
13
6
3
11
4
To disconnect for bottom connections
Area limit for CRV unit
1. Compressor 2. Crankcase heater 3. High pressure switch (HP)
4. Air cooled condenser 5. Liquid receiver 6. Access valve
7. Safety relief valve 8. Filter dryer 9. Sight glass
10. Thermostatic expansion valve 11. Check valve 12. Shut-off valve
13. Evaporating coil 14. Low pressure transducer 15. Capacity modulation solenoid valve
16. Shut-off solenoid valve 17. High pressure transducer 18. Vibration absorber
19. Cup and fitting (sweat) joint
Figure 15 CR020RA, CR035RA air conditioner
Page 75
Appendix 5 Refrigeration & Hydraulic Circuits 65
Liebert.CRV Series Air Conditioner User Manual
18
6
14
12
(On CR035 only)
2
1
MC
15
(External on CR020)
18
12
11
6
5
6
7
10
13
6
3
11
21
19
20
22
B
A
AB
4
Water/Glycol outlet
(top connections)
6
17
8
9
16
(Only with
optional
2-way
valve)
(On CR020 only)
Water/Glycol outlet
(bottom connections)
Water/Glycol inlet
(top connections)
Water/Glycol inlet
(bottom connections)
1. Compressor 2. Crankcase heater 3. High pressure switch
4. Water cooled condenser 5. Liquid receiver 6. Access valve
7. Safety relief valve 8. Filter dryer 9. Sight glass
10. Thermostatic expansion valve 11. Check valve 12. Rotalock shut-off valve
13. Evaporating coil 14. Low pressure transducer 15. Capacity modulation solenoid valve
16. Shut-off solenoid valve 17. Head pressure transducer 18. Vibration absorber
19. Head pressure control valve 20. Valve fittings 21. Check valve (10bar)
22. Blind disk - only with optional two-way valve
Figure 16 CR020RW, CR035RW air conditioner
Page 76
66 Appendix 5 Refrigeration & Hydraulic Circuits
Liebert.CRV Series Air Conditioner User Manual
3
1
5
4
2
A
B
AB
Chilled water outlet
(top connections)
(Only with
optional
2-way
valve)
Chilled water outlet
(bottom connections)
Chilled water inlet
(top connections)
Chilled water inlet
(bottom connections)
1. Chilled water cooling coil 2. Three-port water valve 3. Air bleeding valve
4. Valve fittings 5. Blind disk - only with optional two-way valve
Figure 17 CR040RC air conditioner
Page 77
Appendix 6 Wiring Diagram 67
Liebert.CRV Series Air Conditioner User Manual
Appendix 6 Wiring Diagram
380V～415V/50Hz 3N～
L2
BK
BK
3
4
L1
1
2
BK
NL3 PE
658
7
PE
Main switch
QS
2 4
BK
BK
1
Fan breaker
QF1
～
A1
A2
21436
5
1
4
1
3
3
～
2 4 6
BKBKBK
1 5
Heater breaker
QF5
A1
A2
21436514
13
3
A1
A2
21436
5
2 4
BK
BK
1
Humidifier
breaker
QF7
A1
A2
21436
5
3
LN -+ PE
AC/DC Supply unit
AL
2 4
BK
BK
1
Transformer
breaker
QF8
3
PE1
Fan contactor
KM1
FAN1-NC
FAN1-COM
YE
BL
FAN2-NC
00
Y1
P5
710
054
i-COM
A1
Heat contactor1
KM6
Humidifier
contactor
KM7
0
24
ST13-C ST 13-NC
Thermostat
P2
1 2 3 4
ST12-C ST12-NC
Manual Thermostat
0
0
Door switch1
Door switch2
Door switch3
52
53
63
62
P8
84
83
82
81
Delivery air probe
P10
NC
NOCF-COM
Clogged filter alarm
106
105
Water under floor switch
1
2
3
4
1
2
3
4
5
6
1
2
3
4
P7
1
2
3
4
P14
1
2
3
4
P12
1
2
3
4
5
6
7
8
P6
1
2
3
4
P17 1
2
G0
Y2
24
YG G0
Condensing water valve
71
70
Connection bars
QS-7
XP-1
FAN2-COM
XP-3
XP-5
BK
BK
TB-70
TB-71
TB-24
TB-G0
TB-Y2
TB-00
TB-Y1
TB-710
TB-054
CWV-G
CWV-G0
CWV-Y
QS-5
QS-3
QS-1
PE1
QF1-2
QF1-4
KM1-1
KM1-5
KM1-A1
KM1-13
KM1-2
KM1-6
KM1-14
KM1-A2
Y/GN
FAN1-L
XPE
AL-N
AL-L
AL-PEXPE
QF5-2
QF5-4
QF3-6
KM6-1
KM6-3
KM6-5
KM6-2
KM6-4
KM6-6
KM5-1
KM5-3
KM5-5
KM5-A1
KM5-A2
KM6-A1KM6-A2
KM5-13KM5-14
KM5-2
KM5-4
KM5-6
TB-0
EH-1
EH-3
EH-5
EH-2
EH-4
EH-6
EH-N1
EH-N3
EH-N5
EH-N2
EH-N4
EH-N6
QF7-2
QF7-4
KM7-A1
KM7-1
KM7-5
KM7-A2
KM7-2
KM7-6
SL A D
HUM-SL
HUM-A
HUM-D
BK
BK
QF8-2
QF8-4
R8 S8
TB-R8
TB-S8
BK
BK
A1-P2-4
A1-P2-3
BK
TB-52
TB-53
TB-62
TB-63
TB-81
TB-82
TB-83
TB-84
TB-105
TB-106
A1-P5-1
A1-P5-2
A1-P5-3
A1-P5-4
A1-P7-1
A1-P7-2
A1-P7-3
A1-P7-4
A1-P14-1
A1-P14-2
A1-P14-3
A1-P14-4
A1-P6-1
A1-P6-2
A1-P6-3
A1-P6-4
A1-P8-1
A1-P8-2
A1-P8-3
A1-P8-4
A1-P10-3
A1-P10-4
A1-P10-5
A1-P10-6
MP1-NO MP1-C MP2-NO MP2-C MP3-NO MP3-C
50
TB-50
19
TB-19
1 2
CF-NC
COM
PE9
TB-R8
TB-S8
TB-PE9
BK
Y/GN
Y/GN
Y/GN
BK
BK
BK BK
BL
BK BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
Humidifier
Heat
contactor2
KM5
Fan1
Fan2
XPE
FAN1-N
FAN2-L
FAN2-N
1
3
5
2
4
6
XP
ALL+
AL-L-
Remote ON/OFF
Fire sensor
51
54
TB-51BK
TB-54
BK
61
TB-61 BK
BK
TB-U01
U02
TB-U02
U01
XPE
XPE
XPE
XPE
LWD
Remote display cable supply
Condensate
pump
～
BR
BR
P P
Optional
P1 1 2 3 4 5
24
0
P3 1 2
Etherent switch
A1-P1-1
A1-P1-2
A1-P1-3
A1-P1-4
A1-P3-1
A1-P3-2
TB-24
TB-0
BK
BK
BK
BK
6 5 4 3 2 1
P3P4
Isolation board
A6
P1
TAM
BK BK
A6-P3
A6-P4
P64
A1-P64
A3
Humidification control board
A5
1 2 3 4 5 6P1
1 2 3 4 5 6P2 7 8 9 10
24 0
XPE
Drain
solenoid
valve
P66 P67
A6-P1-6
A6-P1-5
A6-P1-4
A6-P1-3
A6-P1-2
A6-P1-1
A5-P1-1
A5-P1-2
A5-P1-3
A5-P1-4
A5-P1-5
A5-P1-6
A5-P2-1
A5-P2-2
A5-P2-5
A5-P2-6
A5-P2-7
A5-P2-8
A5-P2-9
A5-P2-10
TB-24
TB-0
XPE
A5-P66 A1-P67
BKBKBKBKBK
BK
BKBKBKBKBKBKBK
BK
YV07-2YV07-1
YV7-2YV7-1
Charge
solenoid valve
THB
1
401
400
402
301
300
302
2
3
1
2
3
TB-400
TB-401
TB-402
TB-300
TB-301
TB-302
A1-P16-1
A1-P16-2
A1-P16-3
A1-P15-1
A1-P15-2
A1-P15-3
BK
BK
BK
BK
BK
BK
P16
P15
1
2
3
P4
Remote-DIS
A1
A2
141112
0
395
2
4
Optional
Heat and humidification
lockout relay
K1
User input
No signal input, with a short
connection cable
No signal input, with a short connection cable
Smoke sensor
A3
RT2
Local display
Local-DIS
Local-DIS
Local display
Only for large display
THB
THB
P67
A5-P67
A3
Remote large
display
Remote-DIS
A3
XPEXPEXPEXPEXPEXPEXPEXPEXPEXPEXPE
A1-P4-255TB-55 Y1 Y1
0
XPE
XPE
TB-0
0
Iniection solenoid valve
TB-0
22
TB-22 Y3 Y3BKA1-P2-2
WH
WH
FAN1-BL
FAN1-YE
FAN1-PE
WH
WH
FAN2-PE
YE
BL
FAN2-BL
FAN2-YE
A1-P17-1
A1-P17-2
24
TB-24
HP-2HP-1
High pressure switch
121
126
127
128
+5V
sig
GND
High pressure
sensor
Low pressure
sensor
125
TB-125
TB-126
TB-127
TB-128
TB-121
A1-P12-1
A1-P12-2
A1-P12-4
A1-P12-5
A1-P12-6
A1-P12-7
A1-P12-8
BK
BK
BK
BK
BK
TB-72
TB-73
BK
BK
A1
A2
2162614365141322
21
Compressor
contactor
KM3
0
KM3-1
KM3-3
KM3-5
KM3-13
KM3-21
KM3-61
KM3-2
KM3-4
KM3-6
KM3-14
KM3-62
KM3-A1
KM3-A2
BK
CP-L1
CP-L2
CP-L3
TB-0
BKBKBK
BK
Compressor
1
CP-PE
2 4 6
1 5
Compressor
breaker
QF3
3
QF3-2
QF3-4
QF3-6
73
72
Comp.delivery safety-sta
TSC
BK
BKA1-P10-1
A1-P10-2
0 0 0 0 0 24 24 242 42410 5106121121121125127126 128400401402300301302
50 51 5152 53 53 5405455 61 6162 63 81 8283 847 10710Y2 G070 71 72 7322 395
126 19
Y1 Y1
00 00
U02
U01
R8
S8
Terminal block
XPE
BK
BL
BK
BL
Y/GN
Y/GN
BK
BK
BK
Factory supplied line voltage wiring
Factory supplied 24 volt wiring
Device own line
Notes:
Ethernet or CAN wiring
Inline quick disconnect
Terminal block connector
Naked crimping connector
Wire color code：
BK-Black P-Purple
R-Red
WH-White
BL-Blue
BR-Brown
Y/GN-Yellow green
YE-Yellow
Only for unit CR020RW
Freon solenoid valve
P63
P65
Network Communication
Interface
INTELLISLOT1
INTELLISLOT2
71
72
KM3-71
+5V
sig
GND
Transformer T2
Transformer TC
TC-6
TC-5
T2-6
T2-5
4
T2-1
3
2
4
TC-1
3
2
BK
BK
BK
BK
BK
BK
BK
BK
XPE
A3-PE
XPE
V2
V2+
PE
A3-V1-
A3-V1+
V
1
V1
+
-
Figure 18 CR020 air conditioner
Page 78
68 Appendix 6 Wiring Diagram
Liebert.CRV Series Air Conditioner User Manual
380V～415V/50Hz 3N～
L2
BK
BK
3
4
L1
1
2
BK
NL3 PE
6
5
2 4 6
BKBKBK
1 5
8
7
PE
Compressor
breaker
QF3
Main switch
QS
1
3
5
3～
A1
A2
2162614365141322
21
3
2 4 6
BK BKBK
1 5
Heater breaker
QF5
A1
A2
21436514
13
3
A1
A2
21436
5
2 4
BK
BK
1
Humidifier
breaker
QF7
A1
A2
21436
5
3
LN -+ PE
AC/DC Supply unit
AL
2 4
BK
BK
1
Transformer
breaker
QF8
3
PE1
2
4
6
XP
Compressor
contactor
KM3
00
Y1
P5
710
054
i-COM
A1
Heat contactor1
KM6
Humidifier
contactor
KM7
0
24
ST13-C ST13-NC
Thermostat
P2 1 2 3 4
ST12-C ST12-NC
Manual Thermostat
0
Door switch1
Door switch2
Door switch3
0
Iniection solenoid valve
52
53
61
63
62
P8
84
83
82
81
Delivery air probe
P10
Comp.delivery safety-sta
NC
NOCF-COM
Clogged filter alarm optional
106
105
Water under floor switch
1
2
3
4
1
2
3
4
5
6
1
2
3
4
P7
1
2
3
4
P14
1
2
3
4
P12
1
2
3
4
5
6
7
8
121
126
127
128
+5V
sig
GND
High pressure
sensor
Low pressure
sensor
+5V
sig
GND
125
P6
1
2
3
4
P17 1
2
24
HP-2HP-1
High pressure switch
0
G0
Y2
24
YG G0
Condensing
water valve
71
70
73
72
Factory supplied line voltage wiring
Factory supplied 24 volt wiring
Device own line
Notes:
Connection bars
QF3-2
QF3-4
QF3-6
QS-7
XP-1
XP-3
XP-5
KM3-1
KM3-3
KM3-5
KM3-13
KM3-21
KM3-61
KM3-2
KM3-4
KM3-6
KM3-14
KM3-62
KM3-A1
KM3-A2
BK
BK
BK
BK
BK
CP-L1
CP-L2
CP-L3
CP-PE
Y/GN
TB-70
TB-71
TB-72
TB-73
TB-24
TB-G0
TB-Y2
TB-00
TB-Y1
TB-51
TB-710
TB-054
QS-5
QS-3
QS-1
PE1
TB-0
BK
BK
Y/GN
Y/GN
XPE
AL-N
AL-L
AL-PE
XPE
QF5-2
QF5-4
QF3-6
KM6-1
KM6-3
KM6-5
KM6-2
KM6-4
KM6-6
KM5-1
KM5-3
KM5-5
KM5-A1KM5-A2 KM6-A1KM6-A2
KM5-13KM5-14
KM5-2
KM5-4
KM5-6
TB-0
EH-1
EH-3
EH-5
EH-2
EH-4
EH-6
EH-N1
EH-N3
EH-N5
EH-N2
EH-N4
EH-N6
QF7-2
QF7-4
KM7-A1
KM7-1
KM7-5
KM7-A2
KM7-2
KM7-6
SL A D
HUM-SL
HUM-A
HUM-D
BK
BK
QF8-2
QF8-4
R8S8
TB-R8
TB-S8
BK
BK
A1-P2-4
A1-P2-3
A1-P2-2
BK
BK
TB-52
TB-53
TB-125
TB-126
TB-127
TB-128
TB-121
TB-24
TB-62
TB-63
TB-81
TB-82
TB-83
TB-84
TB-105
TB-106
A1-P5-1
A1-P5-2
A1-P5-3
A1-P5-4
A1-P7-1
A1-P7-2
A1-P7-3
A1-P7-4
A1-P14-1
A1-P14-2
A1-P14-3
A1-P14-4
A1-P12-1
A1-P12-2
A1-P12-4
A1-P12-5
A1-P12-6
A1-P12-7
A1-P12-8
A1-P17-1
A1-P17-2
A1-P6-1
A1-P6-2
A1-P6-3
A1-P6-4
A1-P8-1
A1-P8-2
A1-P8-3
A1-P8-4
A1-P101
A1-P102
A1-P103
A1-P104
A1-P105
A1-P106
MP1-NO MP1-C MP2-NO MP2-C MP3-NO MP3-C
50
TB-50
19
TB-19
TB-0
TB-61
1 2
CF-NC
COM
0 0 0 0 0 24 24 24 24 24 105106121121 121125127126 128400401 402300301302
50 51 51 52 53 53 54 05455 61 61 62 63 81 82 83 84 710710 Y2 G0 70 71 72 73 22 39 5
126 19
Y1 Y1
00 00
U02
U01
R8
S8
PE9
TB-R8
TB-S8
TB-PE9
Ethernet or CAN wiring
Inline quick disconnect
BK
Y/GN
BK
BK
BK BK
BL
BK BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
Terminal block
Humidifier
Heat
contactor2
KM5
Compressor1
XPE
AL-L+
AL-L-
CWV-G
CWV-G0
CWV-Y
Only for unit CR035RW
Terminal block connector
51
BK
54
TB-54BK
Fire sensor
Remote ON/OFF
Naked crimping connector
A1
A2
21436514
13
Fan contactor
KM1
0
KM1-1
KM1-5
KM1-A1
KM1-13
KM1-2
KM1-6
KM1-14
KM1-A2
BK
BK
BK
KM1-3
KM1-4
风机1
3～
风机2
3～
FAN1-NC
FAN1-COM
0-10(3)
FAN1-GND(2)
FAN2-NC
FAN2-COM
FAN1-L1
Y/GN Y/GN
Fan1
Fan2
FAN1-L2
FAN1-L3
FAN2-L1
FAN2-L2
FAN2-L3
0-10(3)
FAN2-GND(2)
2 4
1
Fan breaker
QF1
3
BK
BK
QF1-2
QF1-4
6
5
QF1-6
BK
TB-U01
U02
TB-U02
U01
XPE
XPE
XPE
XPE
XPE
22
TB-22
TSC
LWD
Y3 Y3
Remote display cable supply
Condensate
pump
～
BRBR P P
Optional
P1 1 2 3 4 5
24
0
P3 1 2
A1-P1-1
A1-P1-2
A1-P1-3
A1-P1-4
A1-P3-1
A1-P3-2
TB-24
TB-0
BK
BK
BK
BK
BK
BK
Etherent switch
P64
A1-P64
A3
6 5 4 3 2 1
P3 P4
Isolation board
A6
Humidification control board
A5
P1
1 2 3 4 5 6
P1
TAM
1 2 3 4 5 6P2 7 8 9 10
24 0
XPE
Drain
solenoid valve
P66 P67
A6-P1-6
A6-P1-5
A6-P1-4
A6-P1-3
A6-P1-2
A6-P1-1
A5-P1-1
A5-P1-2
A5-P1-3
A5-P1-4
A5-P1-5
A5-P1-6
A5-P2-1
A5-P2-2
A5-P2-5
A5-P2-6
A5-P2-7
A5-P2-8
A5-P2-9
A5-P2-10
TB-24
TB-0
XPE
A5-P66 A1-P67
BK
BK
BKBKBKBKBK
BK
BK
BK
BKBKBKBKBK
BK
YV07-2YV07-1
YV7-2YV7-1
A6-P3
A6-P4
Charge
solenoid valve
THB
Freon solenoid valve
1
401
400
402
301
300
302
2
3
1
2
3
TB-400
TB-401
TB-402
TB-300
TB-301
TB-302
A1-P16-1
A1-P16-2
A1-P16-3
A1-P15-1
A1-P15-2
A1-P15-3
A1-P4-2
BK
BK
BK
BK
BK
BK
55
TB-55 Y1 Y1
P16
P15
1
2
3
P4
0
XPE
XPE
TB-0
Remote-DIS
A1
A2
141112
0
395
24
Optional
Heat and humidification
lockout relay
K1
User input
No signal input, with a short
connection cable
No signal input, with a short connection cable
Smoke sensor
Wire color code：
BK-Black P-Purple
R-Red
WH-White
BL-Blue
BR-Brown
Y/GN-Yellow green
YE-Yellow
A3
RT2
Local display
Local-DIS
Local-DIS
Local display
Only for large display
THB
THB
P67
A5-P67
A3
Remote large
display
Remote-DIS
A3
XPEXPEXPEXPEXPEXPEXPEXPEXPEXPEXPE
P63
P65
Network Communication
INTELLISLOT1
INTELLISLOT2
72
71
KM3-71
Transformer T2
Transformer TC
TC-6
TC-5
T2-6
T2-5
4
T2-1
3
2
4
TC-1
3
2
BK
BK
BK
BK
BK
BK
BK
BK
XPE
A3-PE
XPE
V2
-
V2
+
PE
A3-V1A3-V1+
V
1
V1+
-
Figure 19 CR035 air conditioner
Page 79
Appendix 6 W iring Diagr am 69
Liebert.CRV Series Air Conditioner User Manual
380V～415V/50Hz 3N～
L2
BK
BK
3
4
L1
1
2
BK
NL3 PE
658
7
PE
Main switch
QS
2 4
BK
BK
1
Fan breaker
QF1
3～
A1
A2
21436514
13
3
3～
2 4 6
BKBKBK
1 5
Heater breaker
QF5
A1
A2
21436514
13
3
A1
A2
21436
5
2 4
BK
BK
1
Humidifier
breaker
QF7
A1
A2
21436
5
3
LN -+ PE
AC/DC Supply unit
AL
2 4
BK
BK
1
Transformer
breaker
QF8
3
PE1
Fan contactor
KM1
FAN1-NC
FAN1-COM
0-10(3)
FAN1-GND(2)
FAN2-NC
00
Y1
P5
710
054
i-COM
A1
Heat
contactor1
KM6
Humidifier
contactor
KM7
0
24
ST13-C ST13-NC
Thermostat
P2 1 2 3 4
ST12-C ST12-NC
Manual Thermostat
0
0
Door switch1 Doo r switch2 Door switch3
52
53
63
62
P8
84
83
82
81
Delivery air probe
P10
NC
NOCF-COM
Clogged filter alarm
106
105
Water under floor switch
1
2
3
4
1
2
3
4
5
6
1
2
3
4
P7
1
2
3
4
P14
1
2
3
4
P12
1
2
3
4
5
6
7
8
P6
1
2
3
4
P17 1
2
G0
Y2
24
YGG0
Chilled water valve
71
70
Factory supplied line voltage wiring
Factory supplied 24 volt wiring
Device own line
Notes:
Connection bars
QS-7
XP-1
FAN2-COM
XP-3
XP-5
BK
BKTB-70
TB-71
TB-24
TB-G0
TB-Y2
TB-00
TB-Y1
TB-710
TB-054
CWV-G
CWV-G0
CWV-Y
QS-5
QS-3
QS-1
PE1
QF1-2
QF1-4
KM1-1
KM1-5
KM1-A1
KM1-13
KM1-2
KM1-6
KM1-14
KM1-A2
Y/GN
Y/GN
FAN1-L1
XPE
AL-N
AL-L
AL-PE
XPE
QF5-2
QF5-4
QF3-6
KM6-1
KM6-3
KM6-5
KM6-2
KM6-4
KM6-6
KM5-1
KM5-3
KM5-5
KM5-A1
KM5-A2
KM6-A1KM6-A2
KM5-13KM5-14
KM5-2
KM5-4
KM5-6
TB-0
EH-1
EH-3
EH-5
EH-2
EH-4
EH-6
EH-N1
EH-N3
EH-N5
EH-N2
EH-N4
EH-N6
QF7-2
QF7-4
KM7-A1
KM7-1
KM7-5
KM7-A2
KM7-2
KM7-6
SL A
D
HUM-SL
HUM-A
HUM-D
BK
BK
QF8-2
QF8-4
R8 S8
TB-R8
TB-S8
BK
BK
A1-P2-4
A1-P2-3 BK
TB-52
TB-53
TB-62
TB-63
TB-81
TB-82
TB-83
TB-84
TB-105
TB-106
A1-P5-1
A1-P5-2
A1-P5-3
A1-P5-4
A1-P7-1
A1-P7-2
A1-P7-3
A1-P7-4
A1-P14-1
A1-P14-2
A1-P14-3
A1-P14-4
A1-P6-1
A1-P6-2
A1-P6-3
A1-P6-4
A1-P8-1
A1-P8-2
A1-P8-3
A1-P8-4
A1-P10-3
A1-P10-4
A1-P10-5
A1-P10-6
MP1-NO MP1-C MP2-NO MP2-C MP3-NO MP3-C
50
TB-50
19
TB-19
1 2
CF-NC
COM
0 0 0 0 0 24 24 24 24 24 105106400401402 300301302
51 51 52 53 53 54 054 61 61 62 63 81 82 83 84 710710Y2 G0 70 71 395
19
Y1 Y1
00 00
U02
U01
R8
S8
PE9
TB-R8
TB-S8
TB-PE9
Ethernet or CAN wiring
Inline quick disconnect
BK
Y/GN
Y/GN Y/GN
BK
BK
BK BK
BL
BK BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
Terminal block
Humidifier
Heat
contactor2
KM5
Fan1 Fan2
XPE
KM1-3
KM1-4FAN1-L2
FAN1-L3
FAN2-L1
FAN2-L2
FAN2-L3
1
3
5
2
4
6
XP
ALL+
AL-L-
50
Remote ON/OFF
Fire sensor
51
54
TB-51BK
TB-54
BK
6
BK
5
QF1-6
61
TB-61 BK
BK
Naked crimping connector
TB-U01
U02
TB-U02
U01
XPE
XPE
XPE
XPE
XPE
LWD
Remote display cable supply
Condensate
pump
～
BR
BR
P P
Optional
P1 1 2 3 4 5
24
0
P3 1 2
Etherent switch
A1-P1-1
A1-P1-2
A1-P1-3
A1-P1-4
A1-P3-1
A1-P3-2
TB-24
TB-0
BK
BK
BK
BK
BK
BK
6 5 4 3 2 1
P3P4
Isolation board
A6
P1
TAM
BK
BK
A6-P3
A6-P4
P64
A1-P64
A3
Humidification control board
A5
1 2 3 4 5 6P1
1 2 3 4 5 6P2 7 8 9 10
24 0
XPE
Drain
solenoid
valve
P66 P67
A6-P1-6
A6-P1-5
A6-P1-4
A6-P1-3
A6-P1-2
A6-P1-1
A5-P1-1
A5-P1-2
A5-P1-3
A5-P1-4
A5-P1-5
A5-P1-6
A5-P2-1
A5-P2-2
A5-P2-5
A5-P2-6
A5-P2-7
A5-P2-8
A5-P2-9
A5-P2-10
TB-24
TB-0
XPE
A5-P66 A1-P67
BKBKBKBKBK
BK
BK
BK
BKBKBKBKBK
BK
YV07-2YV07-1
YV7-2YV7-1
Charge
solenoid
valve
THB
1
401
400
402
301
300
302
2
3
1
2
3
TB-400
TB-401
TB-402
TB-300
TB-301
TB-302
A1-P161
A1-P162
A1-P163
A1-P151
A1-P152
A1-P153
BK
BK
BK
BK
BK
BK
P16
P15
1
2
3
P4
Remote-DIS
A1
A21411
12
0
395
24
Optional
Heat and humidification
lockout relay
K1
User input
No signal input, with a short
connection cable
No signal input, with a short connection cable
Smoke sensor
Wire color code：
BK-Black P-Purple
R-Red
WH-White
BL-Blue
BR-Brown
Y/GN-Yellow green
YE-Yellow
A3
RT2
Local display
Local-DIS
Local-DIS
Local display
Only for large display
THB
THB
P67
A5-P67
A3
Remote large
display
Remote-DIS
A3
XPEXPEXPEXPEXPEXPEXPEXPEXPEXPEXPE
P63
P65
Network Communication
Interface
INTELLISLOT1
INTELLISLOT2
TSC
Cold water temperature sensor
0-10(3)
FAN2-GND(2)
Transformer T2
Transformer TC
TC-6
TC-5
T2-6
T2-5
4
T2-1
3
2
4
TC-1
3
2
BK
BK
BK
BK
BK
BK
BK
BK
XPE
A3-PE
XPE
V2V2
+
PE
A3-V1-
A3-V1+
V
1
V1+
-
Figure 20 CR040 air conditioner
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