Precision Cooling For Business-Critical Continuity™ Liebert® CRV™ Installation, Operation and Maintenance Manual–60Hz, Air-Cooled, Water/Glycol-Cooled and Chilled Water DATA CENTER SOLUTIONS For More Information: (866) 787-3271 Sales@PTSdcs.
MODEL NUMBER NOMENCLATURE - 25 DIGIT CONFIGURATION NUMBER Model Number Part 1 * Model Number Part 2 * Model Details 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 C R 0 2 0 R A 1 C 7 S D 1 8 1 1 E L 1 0 P A * * * Digits 1-2 - Unit Family Liebert CRV = CR Digits 3-5 - Nominal Capacity DX = 020, 035 CW = 040 Digit 6 R = Row-Based, Horizontal Airflow Digit 7 - System Type A = Air Cooled W = Water\Glycol Cooled C = Chilled Water Cooled Digi
TABLE OF CONTENTS 1.0 2.0 LIEBERT CRV COMPONENT LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 2.1 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.0 INSPECTION AND UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4 Chilled Water Connections: Chilled Water Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 9.0 ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 9.1 Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 9.1.1 Power Supply Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E.1 Standard Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 E.2 Optional Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 APPENDIX F - REFRIGERATION & HYDRAULIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 46 Figure 47 Figure 48 Figure 49 Figure 50 Figure 51 Figure 52 Figure 53 Figure 54 Figure 55 Figure 56 Figure 57 Figure 58 Figure 59 Figure 60 Figure 61 Figure 62 Figure 63 Figure 64 Air filter location and input power safety switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remove the air filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Differential pressure switch tubes . . . . . . . . .
IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important safety instructions that should be followed during the installation and maintenance of the Liebert CRV. Read this manual thoroughly before attempting to carry out any operations on the Liebert CRV, including installation and operation. Retain this manual for the entire service life of the Liebert CRV. Only properly trained and qualified personnel should move, install or service this equipment.
! WARNING Risk of electrical shock. Can cause injury and 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 Liebert iCOM® microprocessor does not isolate power from the unit, even in the Unit Off mode.
Liebert CRV Component Location 1.
Liebert CRV Component Location Figure 3 Component location - Liebert CR035, CR020 water/glycol-cooled units 1 7 1 Top water/glycol connections 2 Compressor 3 Brazed plate condenser 4 Bottom water/glycol connections 5 Water/glycol valve 6 Refrigerant receiver 7 Air filters 6 3 5 2 Figure 4 4 Component location - Liebert CR040 chilled water units 1 2 5 3 4 4 1 Top CW connections 2 Air filters 3 Three-way CW valve 4 Bottom CW connections 5 Humidifier
Introduction 2.0 INTRODUCTION 2.1 Product Description The Liebert CRV is a precision cooling unit available in compressorized (air-, water-, or glycol-cooled) and chilled water configurations to be installed within a row of high-density computing racks in a “hot aisle-cold aisle” configuration. Air enters the rear of the Liebert CRV from the hot aisle, is filtered, cooled and conditioned, then discharged into the cold aisle.
Inspection and Unpacking 3.0 INSPECTION AND UNPACKING ! WARNING Risk of top-heavy unit falling over. Can cause equipment damage, personal injury and death. Read all of the following instructions before attempting to move, lift or remove packaging from the Liebert CRV. ! CAUTION Risk of sharp edges, splinters and exposed fasteners. Can cause personal injury.
Inspection and Unpacking • Always keep the packaged Liebert CRV upright and never leave it outdoors. • 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 will fit under the skid. Also, ensure the fork length is suitable for the unit length.
Inspection and Unpacking 3.2.1 Handling the Unit While it is Packaged Figure 7 Recommended unit handling equipment Forklift Spreader Bars and Slings Pallet Jack Piano Jacks • If possible, transport the packaged Liebert CRV using a forklift or 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 that fits under the pallet.
Inspection and Unpacking 3.4 Removing the Unit from the Pallet Using Piano Jacks 1. Remove the 16 lag bolts that secure the four top deck boards, two on each end of the pallet. The lag bolts can be removed using a 1/2" socket wrench, open-end wrench or pliers. 2. Remove the four deck boards. 3. Open the top panel door with the mounted control. 4. Remove the bottom baffle panel assembly by removing the screws using a standard screwdriver. 5.
Inspection and Unpacking 3.5 Removing the Piano Jacks 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Remove the piano jack strapping and pull the piano jacks away from the unit. Remove all material used for panel protection. The unit is now resting on the wooden spacer boards. Remove jam nut from the four (4) stabilizer feet before continuing this step. Lower the four stabilizer feet so that they contact the ground. Use either a 15/16" open-end wrench or pliers.
Prepare the Liebert CRV for Installation 4.0 PREPARE THE LIEBERT CRV FOR INSTALLATION 1. Using a screwdriver, open the electrical panel and the lower front baffle panel to prepare for installation. 2. Open the rear panel, referring to Figure 9. The documents are in the lower rear compartment. Figure 9 Document shipping location Documents are shipped in the lower compartment on the rear of the Liebert CRV 3.
Prepare the Liebert CRV for Installation 4.1 Adjust Baffles to Direct Air Properly ! WARNING Risk of contact with rotating devices. Can cause injury or death. Ensure that the Liebert CRV is shutdown and power has been disconnected before beginning any work on the unit. The Liebert CRV’s fans will continue spinning after the unit is shut off. Wait until the fan blades have stopped before working on the unit.
Liebert iCOM Control 5.0 LIEBERT ICOM CONTROL The Liebert CRV is equipped with the most advanced Liebert iCOM control system. Each Liebert CRV contains a return air temperature and humidity sensor, supply air temperature sensor and three remote rack sensors. Up to an additional 7 remote rack sensors can be added to the sensor network. Each rack sensor takes two temperature readings and reports either the average or the maximum temperature of the two sensors. 5.
Liebert iCOM Control Figure 13 Liebert iCOM menu components for Liebert CRV Return Temperature and Humidity Summary of Rack Sensor Readings Fan Speed Supply Temperature and Humidity Cooling Capacity Next recommended maintenance Last Two Events, Warnings or Alarms Humidification Individual Rack Sensor Temperatures Historical Supply Air Temperature Graph Historical Supply Air Humidity Graph 14
Liebert iCOM Control Table 4 Icon ? ESC Keyboard icons and functions Key Name Function On/Off Key Controls the operational state of the cooling unit. Alarm Key Silences an alarm. Help Key Accesses integrated Help menus. ESCape Key Returns to the previous display view. Enter Key Confirms all selections and selects icons or text. Increase Key (Up Arrow) Moves upward in a menu or increases the value of a selected parameter.
Liebert iCOM Control 5.2.1 Setting the Remote Rack Sensor Address Remove the cap on the rear of the plastic sensor housing. This cap protects the switch selection (SW1) that sets the node address of the sensor. Each sensor must have a unique address to communicate correctly with the Liebert CRV. Follow Table 5 until all connected sensors have been configured. Switches 1 through 6 are used to configure the node address.
Liebert iCOM Control Figure 15 Remote rack sensor termination jumper Termination Jumper in the Terminated Position 5.2.3 Sensor Setup Confirmation If the sensor has been set up correctly and is communicating to the Liebert CRV, then the status of the LED (DS1) located on the sensor circuit board will be solid green.
Liebert iCOM Control 5.3 Wiring for Unit-to-Unit Communications—U2U Cooling units come from the factory-wired and configured for stand-alone operation. Liebert iCOM U2U Ethernet Network The Liebert iCOM U2U network must be isolated from other network traffic. The network switch(es) that connect Liebert iCOM controls need to be dedicated to supporting only Liebert iCOM communication. The U2U network cannot be connected to the building or IT network.
Liebert iCOM Control Figure 17 U2U network setup diagram Display Service /Network Liebert iCom Display Menu Display Service/Network Liebert iCom Display Menu IP Address: 192.168.254.033 U2U Address: 33 Group #: 1 --------------------------------------- IP Address: 192.168.254.034 U2U Address: 34 Group #: 1 --------------------------------------- Display Service /Network Liebert Cooling Unit Control Board Menu Display Service/Network Liebert Cooling Unit Control Board Menu IP Address: 192.168.254.
Liebert iCOM Control Figure 18 Wiring a large display for U2U network operation CAN Cable See Note 4 Large Graphics Display (Rear View) U2U Networking Switch (Field-Supplied) Liebert iCOM I/O Board Straight-Through Ethernet Cables To / From Other Networked Units 194273 Liebert vNSA The Liebert vNSA is designed to connect multiple Liebert iCOM control devices. The Liebert vNSA contains either one or two powered industrial rail switches.
Liebert iCOM Control Table 6 Ports available for connecting Liebert iCOM control devices Liebert vNSA With Number of Ports Number of Ports Number of Ports Remote Used to Connect Used to Available to Large Total Number Remote Large Interconnect Connect Liebert iCOM Display of Ports Display Switches Control Devices Model Liebert vNSA8-Liebert iCOM Liebert vNSA16-Liebert iCOM Liebert vNSA8 Yes No Liebert vNSA16 8 1 - 7 16 1 2 13 8 - - 8 16 - 2 14 Figure 19 Liebert vNSA with optional remot
Liebert iCOM Control 5.3.2 Remote Rack Sensor Operation and Rack View Setup Figure 20 Rack setup screen, page 1 of 3 Once the remote rack sensors have been configured and plugged into the CAN bus network, the control can be configured to use the sensor for either control or reference. If the sensor is set to “Disable,” it will be ignored. The sensor node number corresponds to the DIP switch assignment of the sensor.
Liebert iCOM Control Figure 22 Rack setup screen, page 3 of 3 Once a sensor has been assigned to either control or display its temperature data, a custom label can be assigned to the sensor. This step is not required for the sensor to operate but does provide a logical name for identification. Navigate using the arrow and enter keys to highlight the Assign Names number range. Once the range is selected then press the Enter key to move to the rack location blocks at the bottom of the screen.
Liebert iCOM Control 5.4 Liebert iCOM Control Setup The Liebert iCOM on the Liebert CRV leaves the factory with the fan speed and cooling capacity controlled by the supply air sensor. This control mode is extremely robust and will ensure that you are delivering precise cooling to the cold aisle. To unlock the full capability of the Liebert CRV, the remote rack sensors should be installed, which will allow the fan speed and the cooling capacity to be “de-coupled.
Liebert iCOM Control 5.5 Alarms/Events The following alarms and events are supported by the Liebert iCOM control on the Liebert CRV.
Piping 6.0 PIPING All fluid and refrigeration connections to the unit, with the exception of the condensate drain, are sweat copper. Factory-installed piping brackets must not be removed. Field-installed piping must be installed in accordance with local codes and must be properly assembled, supported, isolated and insulated. Avoid piping runs through noise-sensitive areas, such as office walls and conference rooms.
Piping Figure 25 Gravity drain Internal Drain UNIT External Drain Continuous Downward Slope CORRECT Internal Drain UNIT External Drain Do Not Externally Trap the Unit INCORRECT Internal Drain UNIT External Drain These are external traps also, although unintentional. Lines must be rigid enough not to bow over top of other objects. INCORRECT DPN001556 Rev.
Piping General Guidelines • Equipment damage and personal injury can result from improper piping installation, leak checking, fluid chemistry and fluid maintenance. • Follow local piping codes, safety codes. • Qualified personnel must install and inspect system piping. • Contact a local water consultant regarding water quality, corrosion protection and freeze protection requirements.
Refrigerant Connections 7.0 REFRIGERANT CONNECTIONS ! WARNING Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death. This unit contains fluids and/or gases under high pressure. Relieve pressure before working with piping. ! WARNING Risk of refrigerant system rupture or explosion from over pressurization. Can cause equipment damage, injury or death.
Refrigerant Connections 7.
Refrigerant Connections Figure 28 Bottom entry connection dimensions 7-11/16" (195.5mm) 23-5/8" (600mm) 3-1/8" (80mm) 12-3/4" (324.5mm) 1-3/4" (44mm) 5-1/8" (130mm) UNIT AREA 46-1/4" (1175mm) 3-9/16" (90mm) 1-1/4" (31.5mm) 6-1/16" (154.5mm) 16-5/16" (414mm) 2-1/16" (52mm) 9-3/16" (234mm) o 2-3/16" (55mm) 21-7/16" (544.
Refrigerant Connections 7.2.1 General layout Figure 29 Recommended piping diagram Condenser Refer to Table 8 for relative position of the Liebert CRV and the condenser. Numbers refer to steps below Step 1 1 5 4 Step 4 2 Step 4 3 Liebert CRV Step 2 Step 3 1. Piping must be Type ACR copper tubing. NOTE All field-installed piping must comply with applicable local, state and federal codes. 2. 3. 4. 5. The diameter required is stated in Figures 29 and 30.
Refrigerant Connections Table 8 Condenser positioning Condenser and Liebert CRV at Same Level Condenser Below Liebert CRV (Not Recommended) Indoor Discharge Line Outdoor Insulation Indoor Liquid Line Outdoor necessary only for aesthetic reasons only for aesthetic reasons only for aesthetic reasons necessary only for aesthetic reasons only for aesthetic reasons only if exposed to sun necessary only for aesthetic reasons no (expose to cold under-floor air) only if exposed to sun Room Unit Room Unit Ro
Refrigerant Connections 7.2.2 Pipe Diameter and Thickness ! CAUTION Risk of explosive discharge. Can cause equipment damage, injury or death. Pipes connecting the Liebert CRV and the condensing unit must meet or exceed the values in Figures 29 and 30.
Refrigerant Connections 7.2.3 Installing Piping The following operations must be carried out by an experienced refrigeration technician. NOTICE 1. • • • 2. • 3. 4. 5. 6. 7. 8. Risk of oil contamination with water. Can cause equipment damage. The piping must not be open to the atmosphere for extended periods because the Liebert CRV requires POE (polyol ester) oil. POE oil absorbs water at a much faster rate when exposed to air than previously used oils.
Refrigerant Connections 7.3 Vacuum and Refrigerant Charge NOTICE Risk of improper refrigerant charge. Can cause equipment damage and reduced efficiency. Check the refrigerant type to be used on the data plate of the air conditioner and on the refrigerating compressor. Figure 32 Connections for vacuum creation and refrigerant charge Suction and Supply Line Connections Thermostatic Valve Connection Liquid Line Connection 7.3.
Refrigerant Connections Variable Fan Speed Charging 1. Check unit nameplate for refrigerant type to be used. Unit control configurations differ depending on refrigerant type. 2. Charging the system with refrigerant requires the unit to be in an operational state.. 3. Calculate the amount of charge for the system. Refer to the unit, condenser and refrigerant line charge data in Tables 17, 18 and 19. 4. Weigh in as much of the system charge as possible before starting the unit.
Water Connections 8.0 WATER CONNECTIONS Table 10 Water connection options Liebert CRV Option Top Connections Bottom Connections Condensate Pump and Humidifier Available Available Condensate Pump and No Humidifier Available Available Not Available Available No Condensate Pump and No Humidifier Figure 33 Top connections Water/Glycol Connections Humidifier Water Supply and Condensate Pump Drain Connection (All Models) Front of Liebert CRV 8.
Water Connections • Condensate drain without pump: • Use tubing rated to carry water up to 212°F (100°C) copper, PVC or flexible polythene tubing. • Allow a 2% gradient toward the drain. • Place a drain trap at least 8" (200mm) below the drain tray. The drain trap must be placed under the unit, in the false floor. • Fill the drain trap with water. • Humidifier (optional): See Appendix A - - Humidifier. 8.
Water Connections 8.4 Chilled Water Connections: Chilled Water Units Figure 35 Chilled water connections Top Connections Bottom Rear Connections Refer to Figure 36 when performing these installation steps: • • • • • • • Use copper tubing or steel pipe. Place the tubing on supporting saddles. Insulate both tubes Install shutoff ball valves on the inlet and outlet pipes to ease maintenance. Install thermostats and pressure gauges on the inlet and outlet pipes.
Water Connections Figure 37 Bottom entry dimensions—piping and electrical openings 23-5/8" (600mm) 3-1/8" (80mm) 12-3/4" (324.5mm) 7-11/16" (195.5mm) 1-3/4" (44mm) 5-1/8" (130mm) UNIT AREA 46-1/4" (1175mm) 3-9/16" (90mm) 1-1/4" (31.5mm) 6-1/16" (154.5mm) 16-5/16" (414mm) 2-1/16" (52mm) 9-3/16" (234mm) o 2-3/16" (55mm) 21-7/16" (544.
Electrical Connections 9.0 ELECTRICAL CONNECTIONS 9.
Electrical Connections 9.1.1 Power Supply Cable Connections • • • • • Connect the cable to the line inlet terminal board. Use the appropriate cable size for the flow, supply voltage and installation type. Protect the supply using a backup fuse. Do not fit the supply cable in the raceways inside the machine electric board. Use only multipolar cables with sheath (CEI20-22). Wiring Connections • Remote On/Off connections must be provided by the installer.
Electrical Connections 9.3 Protective Features of Electrical Heaters Figure 41 Electrical heating with temperature sensor protection When the temperature sensor detects overtemperature of electrical heating, the thermal protection turns Off the current. To reset the thermal protection, push the button on the front of the unit (see Figure 41). 9.
Electrical Connections Positioning the 2T Sensor Rack Probes on a Rack To help ensure proper cooling, use the following guidelines to place the Liebert 2T sensor probes: • • • • • on the top of the perforated rack door. in front of the highest-mounted servers in the rack. in front of the highest-density area of the rack. in the airflow path entering the rack. Do not place the probe directly on the metal surface of the perforated door.
Electrical Connections Figure 42 Temperature sensor placement, cabling and chain configuration 46
Startup 10.0 STARTUP 10.1 Initial Startup To start the Liebert CRV: 1. Open all valves in the refrigeration circuit according to the instruction label attached to the valve. 2. W Models 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 7.0 - Refrigerant Connections). 4. Using a leak detector, verify that there are no refrigerant leaks.
Startup Checks to Perform after Startup Once the system is operating under load, check the various components, as follows: 1. Verify that the fans are operating properly. 2. Ensure that the temperature and relative humidity are being controlled, and that the humidifier (optional) and heating steps (optional) operate when required. 3. Ensure that the compressor operates when required. 4.
Startup 10.3 Chilled Water Valve: Chilled Water Models The 3-way valve controls the chilled water flow and operates as follows (refer to Figure 4): • When the valve is fully open (i.e., maximum 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.” The valve running time is set to the value specified in the control manual. For more details, see the technical bulletin for chilled water valves and related actuators.
Operation 11.0 OPERATION Unit operation is completely automatic. The unit operates in the following sequence: • Air is drawn into the unit by the fans, which operate continuously. • The temperature and humidity sensor measures the inlet air, and relays this information to the control system. • The air is immediately filtered. • The air is then conditioned and expelled from the unit.
Calibration and Regulation after Startup 12.0 CALIBRATION AND REGULATION AFTER STARTUP The Liebert CRV has been factory-tested and calibrated, but it is very important to check, at startup, the superheating of the thermostatic valve (A/W versions). • For calibrations of instruments installed on the external condensers/drycoolers, refer to the manual for the equipment. • For control system calibrations, refer to the Liebert iCOM manual, SL-18835.
Maintenance 13.0 MAINTENANCE 13.1 Safety Instructions All maintenance operations must strictly observe national, state and local accident prevention regulations, especially the regulations concerning electrical systems, refrigerators and manufacturing resources. Air conditioning equipment maintenance may be performed only by authorized properly trained and qualified personnel. To keep all warranties valid, the maintenance must adhere to the manufacturer’s regulations.
Maintenance 13.4 Inspect and Replace the Air Filter Check the air filter monthly to maintain efficient air distribution through the evaporator coil. 1. Switch Off the CRV. 2. Open the rear panel with the key and access the fan panel by rotating the three locks with a screwdriver. 3. Wait until the fans stop rotating. When you open the first lock, you also open a safety switch that cuts the input power; see Figure 46 below.
Maintenance Figure 48 Differential pressure switch tubes Differential pressure switch tubes Before restarting the unit, be sure that the microswitches are properly closed; otherwise, the unit remains in safety status. 13.5 Condensate Drain and Condensate Pump Systems 13.5.1 Condensate drain Check for and clear obstructions in tubing during routine maintenance. 13.5.2 Condensate Pump, Dual-Float Figure 49 Condensate pump 1. 2. 3. 4. 5. 13.6 Disconnect power to the unit using the disconnect switch.
Maintenance 13.7 Electrical Heaters 1. Inspect and clean reheat elements. 2. Inspect and tighten support hardware.
Maintenance 13.8 Dismantling the Unit The Liebert CRV 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 proper maintenance. NOTICE Risk of release of hazardous substances into the environment. Can cause environmental pollution and violation of environmental regulations.
Maintenance • Additional information located in a dedicated label of the unit (Reg. 1494/2007): a.
Troubleshooting 14.
Humidifier APPENDIX A - HUMIDIFIER A.1 PRINCIPAL OF OPERATION When the Liebert iCOM calls, the cylinder fills to 100% of the Full Load Amperage (FLA) or to the top of the cylinder, whichever comes first. See Figure 50. If it reaches 100% FLA, the water heats and boils away to a level giving 80% FLA. An electronic timer uses the rate of amp fall to determine the water level.
Humidifier NOTICE Risk of improper water supply. Can reduce humidifier efficiency or obstruct humidifier plumbing. Do not use completely demineralized water with this unit; it is the minerals that allow the electrode principle to work. Do not use a hot water source; it will cause deposits that will eventually block the fill valve opening. A.1.2 Humidifier Water Connection A copper compression olive type coupling for 1/4" O.D.
Humidifier A.1.3 Humidifier Startup and Operation • Ambient temperature location for humidifier: 41 - 104°F (5 - 40°C). • Relative humidity location for humidifiers: 5 - 80% RH. Check to see that the unit is securely mounted on a level surface with the proper drain and water supply. Check for correct voltage with appropriately sized service. Check that the steam distributor, steam supply hose and condensate line are correctly installed and routed back to the unit.
Humidifier Contact Emerson or your local Emerson representative to obtain a replacement cylinder. To obtain the correct cylinder, supply the cylinder model from the white three-digit label on the cylinder, or supply the model, voltage and serial number from the unit specification label. Remove the Old Cylinder 1. Turn Off the water supply to the unit. 2. The old cylinder must be drained completely before removing. This is done by pushing the auto On/Off/Drain switch to the “drain” position. 3.
Humidifier Extended Shutdown Always drain the cylinder before disconnecting power to the humidifier for a period of extended shutdown. Otherwise, the electrodes are subject to harmful corrosion, which drastically shortens the cylinder life. Do not leave the switch in the DRAIN position indefinitely because the drain coil could burn out. Leave the switch in the Off position and open the main external fused disconnect to stop power to the humidifier.
Humidifier Approximately 30 seconds after the contactor pulls in, the fill valve coil should energize. There is also a visible fill relay on the printed circuit board. It is the one located farthest from the C.T. core. The points on this relay must be touching in order for the fill valve coil to be energized. If the points do not touch after the built-in time delay, the sensor input may be interfering. To confirm, remove the black and red sensor wires from terminals 6 and 10 on the PC board.
Humidifier Table 14 Humidifier troubleshooting Unit Status Lamp Yellow On Off 1 flash sequence Green Symptom Corrective actions Maximum water level inside cylinder. This usually happens on initial start-up after replacing the cylinder (normal). Water is concentrated with minerals inside the cylinder. Let unit run; yellow light will disappear when the unit is at full output. This may take a day or two. Off No power to the board. Check for main power supply fault.
Electrical Data APPENDIX B - ELECTRICAL DATA Table 15 Liebert CRV electrical data - 60Hz (Amps) Air-Cooled Units CR035RA Voltage 460\3\60 Water/ Glycol-Cooled Units CR020RA 208\3\60 208\3\60 CR035RW 460\3\60 Chilled Water Units CR020RW 208\3\60 208\3\60 CR040RC 460\3\60 208\3\60 11.7 24.9 Cooling with Dehumidifying, Condensate Pump, Reheat; with or without Humidifier FLA 31.7 62.0 51.0 31.7 62.0 51.0 WSA 38.6 75.4 61.6 38.6 75.4 61.6 14.3 31.
Electrical Data Table 17 R-410A refrigerant and oil charge for air-cooled models Base Oil Charge 1 Model Base Refrigerant Charge 1 lb (kg) Initial Oil Charge oz (kg) CR020RA CR035RA 7 (3.2) 10 (4.5) 60 (1.68) 110 (3.08) Max. Topping Up oz (kg) Max. System Refrigerant Charge before Oil Addition, lb (kg) Weight of Oil to Add for Every 10lb (4.5kg) of Refrigerant over Max System Charge, oz (kg) 56 (1.57) 106 (2.97) 38 (17.1) 28 (12.6) 1.6 (.045) 4 (.113) 1.
Installation Drawings APPENDIX C - INSTALLATION DRAWINGS Figure 54 Overall dimensions / service area Clearance required to install or remove unit from the row REAR Hot air Cold air 49" (1245mm) FRONT 78-3/4" (2000mm) 49" (1245mm) ACCESS REQUIRED TO SERVICE WITHIN THE ROW Rear service area unit is S+B or S+A when B is not available.
Installation Drawings Figure 55 Raised-floor cutouts for piping and electrical connections FRONT 46-1/4" (1175mm) 23-5/8" (600mm) UNIT AREA 3-1/8" (80mm) 12-3/4" (324.5mm) 7-11/16" (195.5mm) 1-3/4" (44mm) 5-1/8" (130mm) 46-1/4" (1175mm) 3-9/16" (90mm) 1-1/4" (31.5mm) 6-1/16" (154.5mm) UNIT AREA 16-5/16" (414mm) 2-1/16" (52mm) 9-3/16" (234mm) 2-3/16" (55mm) 2-3/16" (55mm) 21-7/16" (544.
Installation Drawings Figure 56 Air bleeding valve position CW REAR VIEW Figure 57 Electrical connections - entry TOP INLET FRONT BOTTOM INLET (possible with raised floor) 70
Refrigerant, Hydraulic and Electrical Connections APPENDIX D - REFRIGERANT, HYDRAULIC AND ELECTRICAL CONNECTIONS Figure 58 Connections—air-cooled models REAR Piping and electrical connections available at the top and bottom of unit. Attention: Air-cooled systems may require additional oil to be added in the field in order to allow for sufficient compressor lubrication. Please see the user manual for details.
Refrigerant, Hydraulic and Electrical Connections Figure 59 Connections—water/glycol models REAR Piping and electrical connections available at the top and bottom of unit. 4-1/8" (105mm) 6-1/8" (155mm) BOTTOM CONNECTIONS (possible with raised floor) TOP CONNECTIONS 3-1/4" (83mm) 9-1/2" (242mm) 17-5/16" (440mm) HF DP OWC 3-1/16" (77mm) 2-11/16" (69mm) 3-1/4" (83mm) Table 23 1-3/8" (35mm) EC-LV 2-1/8" (54mm) 5-1/8" (130mm) CD or DP EC-LV 7-13/16" (199mm) 2-3/16" (56mm) DPN001793 Rev.
Refrigerant, Hydraulic and Electrical Connections Figure 60 Connections—chilled water models REAR Piping and electrical connections available at the top and bottom of unit. 6-1/8" 4-1/8" (155mm) (105mm) BOTTOM CONNECTIONS (possible with raised floor) TOP CONNECTIONS 17-5/16" (440mm) 3-1/4" (83mm) 9-1/2" (242mm) HF DP OCW ICW 2-11/16" (69mm) 1-3/8" (35mm) EC-LV 2-3/16" (56mm) 3-7/8" (98mm) CD or DP EC-LV 7-13/16" (199mm) DPN001794 Rev.
Electrical Field Connections Descriptions APPENDIX E - ELECTRICAL FIELD CONNECTIONS DESCRIPTIONS E.1 STANDARD ELECTRICAL CONNECTIONS 1. High-voltage entrance through the bottom of the electric panel—1.38" (34.9mm), 1.75" (44.5mm) and 2.50" (64mm) diameter concentric knockout. 2. Low-voltage entrance through the bottom of the electric panel—Quantity, two; 1.125" (28mm) diameter knockouts. 3. High-voltage entrance through the top of the unit—1.38" (34.9mm), 1.75" (44.5mm) and 2.
Electrical Field Connections Descriptions Figure 61 Electrical field connections High-Voltage Wiring Top Entry Top of Liebert CRV Low-Voltage Wiring Top Entry 9 - Customer Alarm Input 9 - Customer Alarm Input 8 - Remote Unit Shutdown 9 - Customer Alarm Input 16 - Liebert Liqui-tect Shutdown and Dry Contact Overload Protection 11 - Heat Rejection Interlock 12 - Smoke Sensor Alarm (optional) Earth Ground 13 - Reheat and Humidifier Lockout 14 - Condensate Alarm (optional) Contactors 12 - Smoke Sensor
Refrigeration & Hydraulic Circuits APPENDIX F - REFRIGERATION & HYDRAULIC CIRCUITS Figure 62 General arrangement—air-cooled units (On CR35 Only) Access Valve Access Valve Crankcase Heater Low-Pressure Transducer Rotalock Shutoff Valve (External on CR20) Evaporating Coil High-Pressure Switch Vibration Absorber Thermostatic Expansion Valve Compressor MC Shutoff Valve High-Pressure Transducer Shutoff Solenoid Valve Vibration Absorber Access Valve Capacity Modulation Solenoid Valve Access Val
Refrigeration & Hydraulic Circuits Figure 63 General arrangement—water-glycol units (On CR35 Only) Access Valve High-Pressure Switch Vibration Absorber Access Valve Crankcase Heater Low-Pressure Transducer Rotalock Shutoff Valve Rotalock Shutoff Valve MC Capacity Modulation Solenoid Valve Check Valve Water/Glycol Outlet (bottom connections) Water/Glycol Inlet (top connections) Head-Pressure Transducer Access Valve Check Valve Access Valve Water/Glycol Outlet (top connections) Safety Relief
Refrigeration & Hydraulic Circuits Figure 64 General arrangement—chilled water 78
Refrigeration & Hydraulic Circuits NOTES 79
Refrigeration & Hydraulic Circuits 80
Ensuring The High Availability Of Mission-Critical Data And Applications. Emerson Network Power, the global leader in enabling business-critical continuity, ensures network resiliency and adaptability through a family of technologies—including Liebert power and cooling technologies—that protect and support business-critical systems. Liebert solutions employ an adaptive architecture that responds to changes in criticality, density and capacity.
