Liebert CR020 User Manual
  1. Manuals
  2. Brands
  3. Liebert Manuals
  4. Air Conditioner
  5. CR020
  6. User manual

Liebert CR020 User Manual

Crv series
Hide thumbs
Table of Contents

Advertisement

Quick Links

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

Advertisement

Table of Contents
loading

Related Manuals for Liebert CR020

Summary of Contents for Liebert CR020

  • Page 1: User Manual

    Liebert.CRV Series Air Conditioner User Manual Version V1.4 Revision date May 28, 2012 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.

  • Page 3: Important Safety Instructions

    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.
  • Page 4 C R 0 2 0 Digit 3, 4 and 5: Cooling Capacity "kW" (approx.) Digit 1 and 2: Family Nominal cooling capacity CR: Liebert.CRV Digit 6 - Air Discharge Digit 12 – Display R: Horizontal airflow A: Display - Small Display 1 T+H Sensor...
  • Page 5 Digit 16 - Enclosure options 3: One IS485 card 1: Color Standard 4: Two IS485 cards 2: Color Special 5: IS web & IS 485 cards Digit 17 - Condensate pump/crankcase heater Digit 20 - Sensors A: DX units - crankcase heater 0: Sensors - None E: DX units - condensate pump &...

  • Page 7: Table Of Contents

    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 ............
  • Page 8 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 &...
  • Page 9 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...

  • Page 11: Chapter 1 Preliminary Operations

    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.

  • Page 12: Operating Limits

    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.
  • Page 13 Table 1-7 Operating limits for chilled water (C) and water/glycol-cooled (W) units Description Item CR020RW CR035RW CR040RC Max. water pressure (bar) Max. differential pressure through the closed valve: Dpcv (kPa) Max. differential pressure across the valve for modulating service: Dpms (kPa) Liebert.CRV Series Air Conditioner User Manual...

  • Page 14: Noise Level Limits

    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.
  • Page 15 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. Liebert.CRV Series Air Conditioner User Manual...
  • Page 16 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. 1. Termostatic expansion valve 2. Solenoid valve 3. Sight glass 4.
  • Page 17 Chapter 1 Preliminary Operations The component locations of Liebert CR020 ~ CR035 water/glycol-cooled (W) units are shown in Figure 1-8. 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.

  • Page 18: Chapter 2 Unit Positioning

    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.
  • Page 19 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.
  • Page 20 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.
  • Page 21 Chapter 2 Unit Positioning 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.
  • Page 22 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.

  • Page 23: Chapter 3 Unpacking And Installation

    Chapter 3 Unpacking And Installation 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.

  • Page 24: Handling The Unit While Packaged

    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. Liebert.CRV Series Air Conditioner User Manual...
  • Page 25 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 Liebert.CRV Series Air Conditioner User Manual...

  • Page 26: Installation

    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. Liebert.CRV Series Air Conditioner User Manual...
  • Page 27 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.
  • Page 28 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 Liebert.CRV Series Air Conditioner User Manual...

  • Page 29: Chapter 4 Refrigeration Connections

    Chapter 4 Refrigeration Connections 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.

  • Page 30: Pipe Diameter And Thickness

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 31: Installing Pipelines

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 32: Vacuum Creation And Refrigerant Charge

    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. Figure 4-3 Pump and refrigerant charging cylinder connection Liebert.CRV Series Air Conditioner User Manual...

  • Page 33: R410A Precharge For Air-Cooled (A) Units

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 34: Refrigerant Charge For Air-Cooled (A) Units

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 35: Chapter 5 Water Connections

    Chapter 5 Water Connections 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.

  • Page 36: Water Connections - Supply Humidifier And Drain Water (All Units)

    To be connected to avoid spraying condensate. by user 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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 37: Chilled Water Connections For Water/Glycol-Cooled (W) Units

    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.

  • Page 38: Chilled Water Connections For Chilled Water (C) Units

    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. conditioner ④ ⑤ ② ③ ① ⑥ Figure 5-6 Chilled water circuit Liebert.CRV Series Air Conditioner User Manual...
  • Page 39 Safety valve Check valve Filling meter Expansion tank Manometer Drain (at lowest point) ry cooler Figure 5-7 Schematic diagram of installing d For detailed parameters, refer to Appendix 4 Refrigerant, Hydraulic And Electrical Connections. Liebert.CRV Series Air Conditioner User Manual...

  • Page 40: Chapter 6 Electrical Connections

    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.

  • Page 41: Protective Features Of Ec Fans

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 42: Protective Features Of Electrical Heaters

    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. Liebert.CRV Series Air Conditioner User Manual...
  • Page 43 Cable connection of first sensor TOP INLET Top inlet FRONT VIEW Front view Amplified CAN port BOTTOM INLET Bottom inlet (possible (possible with raised floor) with raised floor) Figure 6-7 Connection of temperature sensor Liebert.CRV Series Air Conditioner User Manual...
  • Page 44 6 wires, 3 couples, shielded twisted pair Termination: RJ12 3 × 2 × 0.14mm (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 Liebert.CRV Series Air Conditioner User Manual...

  • Page 45: Chapter 7 Start-Up

    Chapter 7 Start-Up 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)

  • Page 46: Automatic Restart

    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.
  • Page 47 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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 48: Chapter 8 Operation

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 49: Chapter 9 Calibrations & Regulation (At Start-Up)

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 50: Chapter 10 Maintenance & Spare Parts

    Chapter 10 Maintenance & Spare Parts 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.

  • Page 51: Air Filter Check Or Substitution

    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). Liebert.CRV Series Air Conditioner User Manual...
  • Page 52 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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 53: Condensate Drain And Condensate Pump Systems

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 54: Refrigerant Charge Of The Water-Cooled Units

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 55: Regulation (Ec) No. 842/2006 (F-Gas)

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 56: Unit Diagnostic

    Restore electrical supply Local display not operational Unit main switch is off Switch on the unit and unit does not operate Control board supply issue Call Emerson services Control board issue Call Emerson services Liebert.CRV Series Air Conditioner User Manual...

  • Page 57: Appendix 1 Humidair Humidifier

    Must be included in the It is supplied a 1.5m long the 3/4" male connection B supply water tubing. plastic tube, with 1/2"Gm on the humidifier. connections. Figure 1 Supply water connection Liebert.CRV Series Air Conditioner User Manual...
  • Page 58 3. To avoid water leakages, use teflon tape between flexible tube and connections. Figure 2 Drain water connection Notes: 1. Allow a 2% gradient towards the drain outlet. 2. Avoid back pressures in the drain piping. Liebert.CRV Series Air Conditioner User Manual...

  • Page 59: Humidifier Components

    The steam production rate can be controlled Liebert.CRV Series Air Conditioner User Manual...

  • Page 60: Maintenance

    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). Liebert.CRV Series Air Conditioner User Manual...

  • Page 61: Replacing Humidifier Spare Parts

    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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 62: Appendix 2 Technical Data Tables

    380V ~ 415V/3N/50Hz CR035 pump CR040 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 Liebert.CRV Series Air Conditioner User Manual...
  • Page 63 The distance of pipeline for air cooled models is shown in Figure 4. Pipeline from conditioner to air condenser Condenser Air conditioner Distance (D) = a + b + c Figure 4 Distance of pipeline Liebert.CRV Series Air Conditioner User Manual...
  • Page 64 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 Unit SPL Airflow...

  • Page 65: Appendix 3 Installation Drawing

    Appendix 3 Installation Drawing Appendix 3 Installation Drawing Front view Figure 5 Dimensions of the air conditioner (unit: mm) Figure 6 Front and back service area (unit: mm) Liebert.CRV Series Air Conditioner User Manual...
  • Page 66 Appendix 3 Installation Drawing Service area is S + B or S + A Figure 7 Service area (top view, unit: mm) Liebert.CRV Series Air Conditioner User Manual...
  • Page 67 Appendix 3 Installation Drawing Front view Unit area 324.5 195.5 154.5 31.5 55.5 544.5 Dimensions of the unit area Figure 8 Dimensions of the raised floor for piping and electrical connections (unit: mm) Liebert.CRV Series Air Conditioner User Manual...
  • Page 68 A amplified Figure 9 Position of the air bleeding valve for chilled water models (rear view) Top inlet Front view Amplified figure Bottom inlet (possible with raised floor) Figure 10 Cable inlet for electrical connections Liebert.CRV Series Air Conditioner User Manual...

  • Page 69: Appendix 4 Refrigerant, Hydraulic And Electrical Connections

    Humidifier drain ID 22mm Attention: with pump, CD is connected with HD, see DP Pump drain 12.7mm GAS F EC-HV Electrical supply – high voltage Hole, Φ63mm EC-LV Electrical supply – low voltage Hole, Φ28mm Liebert.CRV Series Air Conditioner User Manual...
  • Page 70 Humidifier drain ID 22mm Attention: with pump, CD is connected with HD, see DP Pump drain 12.7mm GAS F EC-HV Electrical supply – high voltage Hole, Φ63mm EC-LV Electrical supply – low voltage Hole, Φ28mm Liebert.CRV Series Air Conditioner User Manual...
  • Page 71 Humidifier drain ID 22mm Attention: with pump, CD is connected with HD, see DP Pump drain 12.7mm GAS F EC-HV Electrical supply – high voltage Hole, Φ63mm EC-LV Electrical supply – low voltage Hole, Φ28mm Liebert.CRV Series Air Conditioner User Manual...
  • Page 72 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. Liebert.CRV Series Air Conditioner User Manual...
  • Page 73 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. Liebert.CRV Series Air Conditioner User Manual...

  • Page 74: Appendix 5 Refrigeration & Hydraulic Circuits

    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 Liebert.CRV Series Air Conditioner User Manual...
  • Page 75 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 Liebert.CRV Series Air Conditioner User Manual...
  • Page 76 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 Liebert.CRV Series Air Conditioner User Manual...

  • Page 77: Appendix 6 Wiring Diagram

    Ethernet or CAN wiring BK-Black P-Purple BL-Blue Factory supplied 24 volt wiring R-Red BR-Brown YE-Yellow Device own line WH-White Inline quick disconnect Y/GN-Yellow green Terminal block connector Naked crimping connector Figure 18 CR020 air conditioner Liebert.CRV Series Air Conditioner User Manual...
  • Page 78 P-Purple Ethernet or CAN wiring BL-Blue Factory supplied 24 volt wiring R-Red BR-Brown YE-Yellow Device own line WH-White Inline quick disconnect Y/GN-Yellow green Terminal block connector Naked crimping connector Figure 19 CR035 air conditioner Liebert.CRV Series Air Conditioner User Manual...
  • Page 79 Wire color code： Ethernet or CAN wiring BK-Black P-Purple Factory supplied 24 volt wiring BL-Blue R-Red Device own line BR-Brown YE-Yellow WH-White Inline quick disconnect Y/GN-Yellow green Naked crimping connector Figure 20 CR040 air conditioner Liebert.CRV Series Air Conditioner User Manual...

This manual is also suitable for:

Cr035Cr040

Table of Contents