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Emerson Liebert CRV, Руководство пользователя

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Operation in Teamwork Mode

Liebert

®

 CRV

™

138

12.4.5 Teamwork Mode 3 (Optimized Aisle)

Teamwork Mode 3 can be selected when the units are set to operate in Optimized Aisle Control mode 

and have been connected in a unit to unit (U2U) network. Teamwork provides coordination between 

the units that will prevent “fighting” by not allowing units to operate in conflicting modes of operation 

at the same time by selecting which mode to operate within based on the maximum or average 

reading of the collective unit sensors (Humidifying vs. Dehumidifying). When the units are set to 

control off an average, the number of units calculated in the average can be set lower than the total 

number of units connected. This provides a more-defined control strategy by taking into account only 

the worst-case readings.
Teamwork Mode 3 allows the cooling capacity (Supply Sensor) to operate as a local control by 

removing only the amount of load required to maintain the discharge air temperature at each unit. 

This allows for an unbalanced room load while maintaining a consistent discharge air temperature. 

The fan speed is controlled by the remote rack sensors of all units, providing a controlled delivery 

method of the air to the cold aisle. This distribution is achieved by operating all fans in parallel, which 

will also yield the greatest energy efficiency.

12.4.6 Standby-Rotation

Typical Standby (Lead/Lag) Function

This function can be performed in any teamwork mode, including NO Teamwork.
One or more units can be defined to be Standby; the normal status of standby units is Standby Off 

(fan Off).
If one regular unit has an alarm that is defined (to be defined in the alarm configuration), to switch 

On a standby unit, the faulty unit will switch Off and the standby unit will switch On.
If the next unit has an alarm, the next standby unit will be started. If no more standby units are 

available, the unit with a non-critical alarm that permits unit operation will be switched On again 

(water detection, fan alarm, fire alarm etc. will not permit a unit to restart).
The standby function can be rotated daily, weekly or monthly.
The rotation is performed with a selectable number of units: if 

1

 is selected, to standby rotates from 

1-2 to 2-3 in a four unit configuration with two standby units, and rotates from 1-2 to 3-4 in the same 

configuration, when the rotation parameter is set to 

2

.

Standby and Cascade

Cascade is possible in Teamwork Modes 1 and 3 only.

• Cooling  for  Teamwork Mode 1
• Fan PI for Teamwork Mode 3 (Optimized Aisle)

Standby units will start if an alarm occurs in one of the active units. If the standby units are 

cascaded, they will also start and work with the regular active units if the temperature cannot be 

controlled by the active units; before a high or low temperature condition occurs. Cascaded units are 

switched off again as soon as the temperature returns back to normal.
When Cooling is set as the cascade mode, units will be started based on the CFC (call for cooling)—

Teamwork Mode 1.
 When Fan PI is set as the cascade mode, units will be started based on the CFF (call for fan)—

Teamwork Mode 3.

NOTE

Cascaded units are not included in the calculation of the average temperature / humidity.

Содержание Liebert CRV

Страница 1: ...Liebert CRV Row Based Cooling System A SmartAisle Technology User Manual 60Hz 600mm Wide Air Cooled Water Glycol Cooled and Chilled Water Units 300mm Wide Air Cooled Units ...

Страница 2: ......

Страница 3: ...umidifier Supply Water Optional Steam Generating Canister 600mm 24 Models 28 5 2 5 Requirements of Systems Using Water or Glycol 600mm 24 Models 28 6 0 REFRIGERANT CONNECTIONS FOR AIR COOLED UNITS 31 6 1 Piping Guidelines Air Cooled Units 31 6 2 Refrigerant Piping Air Cooled Models 33 6 3 Liebert MC Condenser Selection 600mm 24 and 300mm 12 CRV Units 34 6 4 Liebert Fin Tube Condenser Selection 600...

Страница 4: ...Baffles on 300mm 12 Models 78 10 4 3 Adjust Blocker Plate 600mm 24 models 79 11 0 LIEBERT ICOM CONTROL 80 11 1 Control Interface 82 11 1 1 Navigating Through the Liebert iCOM Menus 82 11 1 2 Accessing Submenus 84 11 1 3 Submenus 85 11 1 4 Viewing Multiple Units with a Networked Large Display 88 11 2 Liebert iCOM Display Readout 90 11 3 Liebert CRV Operation Liebert iCOM Control 93 11 3 1 Entering ...

Страница 5: ...13 8 Remote Rack Sensor Operation and Rack View Setup 152 14 0 OPERATION 153 14 1 Alarms Events 155 15 0 CALIBRATION AND REGULATION AFTER STARTUP 160 15 1 Thermostatic Expansion Valve 160 15 1 1 Determine Suction Superheat 160 15 1 2 Adjust Superheat Setting with the TEV 160 15 2 Environmental Protection 160 15 3 Calibrating Electrical Components 160 16 0 MAINTENANCE 161 16 1 Safety Instructions 1...

Страница 6: ...Figure 13 General arrangement Liebert MC condenser air cooled 600mm 24 units with and without Liebert Lee Temp condenser 21 Figure 14 General arrangement fin tube condenser air cooled 600mm 24 units with and without Liebert Lee Temp condenser 22 Figure 15 General arrangement Liebert MC condenser with and without Liebert Lee Temp air cooled 300mm 12 units 23 Figure 16 General arrangement water glyc...

Страница 7: ...efault screen symbols 81 Figure 54 User menu icons and descriptions 82 Figure 55 Service menu icons 83 Figure 56 System View screen 84 Figure 57 Unit View screen 84 Figure 58 Main screens User Service and Advanced 85 Figure 59 Screen transition 86 Figure 60 Menu tree Stand alone units or units not in a network 87 Figure 61 Liebert CRV system screen 88 Figure 62 Menu tree Liebert CRV s in a network...

Страница 8: ...or calibration setup parameters Page 2 121 Figure 106 Service menus Sensor calibration setup parameters Page 3 121 Figure 107 Service menus Sensor calibration setup parameters Page 4 122 Figure 108 Service menus System network setup parameters System Page 1 for the Display 122 Figure 109 Service menus System network setup parameters Large display only System Page 2 for the Display 123 Figure 110 S...

Страница 9: ... or without Liebert Lee Temp 35 Table 10 Liebert CRV position relative to the remote condenser Liebert MC and fin tube condenser with or without Liebert Lee Temp 35 Table 11 Recommended refrigerant line sizes Cu OD for Liebert MC and VFD control fin tube condensers with R 410A with and without Liebert Lee Temp 36 Table 12 Liebert MC Condenser piping sizes for 600mm 24in and 300mm 12in units 37 Tab...

Страница 10: ...ettings 94 Table 34 Service contact info parameters 129 Table 35 Teamwork Mode 1 or 3 definition of Serial Parallel and Local 139 Table 36 DIP switch settings 141 Table 37 Liebert CRV Glossary 156 Table 38 Calibrating electrical components 160 Table 39 Maintenance schedule 163 Table 40 Unit diagnostics 172 Table 41 Liebert iCOM medium control board DIPswitch settings 174 Table 42 Humidifier troubl...

Страница 11: ...rial number in order to obtain assistance or spare parts locate the identification label on the outside of the unit A warning label on the front and back panels reminds users that the Liebert CRV restarts automatically the main switch must be opened before opening the internal compartments for any operation WARNING Arc flash and electric shock hazard Can cause injury and death Open all local and r...

Страница 12: ... about 212 F 100 C some components such as the evaporator may remain at low temperature fan blades may continue to rotate by inertia These residual risks are highlighted by warning labels on the Liebert CRV WARNING Risk of explosive discharge from high pressure refrigerant Can cause injury and death This unit contains fluids and gases under high pressure Relieve pressure before working with piping...

Страница 13: ... the required additives called inhibitors that reduce the corrosive effect of the fluids on the piping systems and components The chemistry of the water used must be considered because water from some sources may contain corrosive elements that reduce the effectiveness of the inhibited formulation Sediment deposits prevent the formation of a protective oxide layer on the inside of the coolant syst...

Страница 14: ...08V 3ph 60Hz P 208 230V 1ph 60Hz Control transformer can be tapped to provide 240V 1ph 60Hz Digit 18 Option Package 600 Series Only 0 None Y 208 230 3ph 60Hz Digit 10 Cooling System H Reheat and Humidifier Lockout 600mm 24in wide series C Reheat and Humidifier Lockout Additional Alarm Contact 2 Two Way Valve CW 600mm 24in models only D Low Sound Package DX units only 3 Three Way Valve CW 600mm 24i...

Страница 15: ...ical entrance 2 Electric box 3 Top humidifier water supply condensate pump drain 4 Supply and Return Connections 5 EC plug fans 6 Electric heaters 7 Humidifier distributor 8 Condensate pump 9 Bottom electrical entrance 10 Bottom condensate pump drain 11 Evaporator CW coil 12 Liebert iCOM 13 Serial tag inside door 1 3 2 6 5 4 7 8 9 10 11 13 12 FRONT REAR ...

Страница 16: ...ical entrance 2 Liebert iCOM 3 Evaporator Coil 4 Bottom Refrigerant Connections 5 Knockouts for bottom electrical entrance 6 Compressor 7 Caster and leveling foot 8 Serial Tag 9 Electric box 10 Main disconnect switch 11 Baffles five assemblies 12 EC plug fans five 13 Top Refrigerant Connections 2 FRONT REAR FRONT REAR 3 6 8 12 10 5 ...

Страница 17: ...n B is not available 12 305mm Nominal 78 3 4 2000mm 25 9 16 650mm 25 9 16 650mm 107 5 16 2725mm 13 3 4 350mm 46 1 4 1175mm 21 5 8 550mm 35 9 16 903mm 3 5 16 100mm 3 15 16 100mm 27 9 16 700mm Air Filters 23 5 8 600mm 23 5 8 600mm Install Install 49 1245mm 49 1245mm Hot Air 46 1 4 1175mm 3 75mm Cold Air REAR REAR VIEW FRONT DPN001791 Rev 3 A S S TOP VIEW B Door Fully Open Front or Rear Clearance Req...

Страница 18: ...3 1 100 49 2 1 250 507 230 Either Front or Rear Clearance Required Install Depth Install Depth Access Required to Install the Unit Between Existing Racks Within the Row 12 300mm 12 300mm 12 300mm 12 300mm 12 300mm 12 300mm 12 300mm Access Required to Service the Unit Between Existing Racks Within the Row Service area is S A B 36 915mm 36 915mm 79 2000mm COLD AIR HOT AIR TOP VIEW REAR FRONT with Di...

Страница 19: ...V from the hot aisle is filtered cooled and conditioned then discharged into the cold aisle The Liebert CRV provides all the necessary functions of a standard precision air conditioner including cooling heating humidification dehumidification air filtration condensate management temperature control alarm monitoring and data communication The Liebert CRV is optimized for maximum cooling capacity in...

Страница 20: ...artAisle from Emerson is custom designed offering the most favorable layout for the installation The design takes into account the equipment required equipment sizes with the heat load or power consumption cooling equipment type chilled water or water glycol based and whether cooling or power redundancy is desired Some typical components are Depending on heat load and power requirements there may ...

Страница 21: ...gns 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 of the claim to Emerson Network Power or your Emerson representative 3 1 1 Packing Material All material used to package this unit is recyclable Please save this material for future use or dispose of it appropriately WARNING Risk of top hea...

Страница 22: ...6 154 34 860 CR020 air cooled or water glycol 600mm 24 20 508 12 305 28 711 CR035 air cooled or water glycol 600mm 24 20 508 12 305 32 813 CR040 chilled water 600mm 24 21 533 12 305 32 813 The center of gravity on the Liebert CRV varies with the options and the model s size Table 4 Weights without packaging Model No Electrical Data Weight 5 lb kg Air Cooled Water Glycol Cooled Chilled Water CR019 ...

Страница 23: ...gth for 600mm 24 model is 60 1524mm Skid length for 300mm 12 model is 54 1372mm Do not lift the packaged unit any higher than 4 102mm All personnel except those moving the Liebert CRV must be kept 12 3 7m or more from the unit while it is being moved If the unit must be lifted higher than 4 102mm all personnel not directly involved in moving the Liebert CRV must be 20 5m or more from the unit Tabl...

Страница 24: ...wer the Liebert CRV and remove the slings Figure 8 Moving the unit using rigging WARNING Risk of top heavy unit falling over Can cause equipment damage injury and death Verify that all lifting equipment is rated for the weight of the unit See Tables 4 and 5 for unit weights Read all of the following instructions before attempting to move lift or remove packaging from the Liebert CRV CAUTION Risk o...

Страница 25: ...ecuring ramp to skid 2 Place the ramp and the plastic bag with orange clips to the side for use in removing the unit from the skid 3 Remove the stretch film and corner side packaging planks from around the unit 4 Remove the unit bag when ready to install the unit Figure 9 Unpacking the Liebert CRV 197023 Rev 5 ...

Страница 26: ...rackets to the unit base The bolts can be removed using a 13mm socket wrench open end wrench or pliers 11 Remove the side tie down brackets 12 Remove the eight bolts four on each side that secure the lift block to the skid The bolts can be removed using a 17mm socket wrench open end wrench or pliers 13 Remove the lift blocks from the skid 14 Using the stabilizer feet lower the unit to the skid 15 ...

Страница 27: ...n moved to where it will be installed the baffle panel can be reattached 1 Open top panel door the one with the Liebert iCOM 2 Reattach the bottom baffle panel assembly with screws using a T30 Torx drive 3 Close and latch top panel door 4 Bolts on Each Side Secure the Tie Down Bracket to the Skid M17 Socket M13 Socket Step 5 197023 Rev 5 Step 1 Step 8 Step 8 Step 15 ...

Страница 28: ...lease the retaining clips along the seam in the corrugated packaging from around the unit This will allow removing the corrugated packaging see Steps 1 and 2 in Figure 11 2 Remove the two ramps each is secured to the skid with two bolts with 1 4 hexagonal heads 3 Fit the tab on each ramp into a hole on the shipping pallet as shown in see the detail area in Step 3 in Figure 11 4 Remove the two ship...

Страница 29: ...to avoid corrosion or health hazards caused by condensate accumulation a Turning the base supports or feet clockwise will extend them lifting the unit one corner at a time b Tighten the nut on the top of each adjustable foot to lock the feet The nut on 600mm 24in units is inside the cabinet The nut on 300mm 24in units is under the cabinet Figure 12 Adjust leveling feet 600mm 24in and 300mm 12in un...

Страница 30: ... layout under the raised floor is required to prevent the airflow from being blocked When installing piping on the subfloor Emerson recommends installing the pipes in a horizontal plane rather than stacked one above the other Whenever possible the pipes should be run parallel to the airflow 5 1 Fluid Connections NOTICE Risk of water leakage Can cause severe property damage and loss of critical dat...

Страница 31: ...led Fusible Plug Liebert Lee Temp Receiver Head Pressure Control Valve Hot Gas Discharge Liquid Low Pressure Transducer Suction Line Pressure Transducer Filter Drier Sight Glass Liebert MC Condenser With Liebert Lee Temp Receiver Distributor CR020 Digital Solenoid Valve Digital Scroll Compressor CR035 Digital Solenoid Valve Liebert MC Condenser Hot Gas Discharge Liebert CRV Unit and Associated Pip...

Страница 32: ...ection locations 2 One or more additional pressure relief valves are required downstream of any and all field installed isolation Do not isolate any refrigerant circuits from overpressurization protection CR020 Digital Solenoid Valve Expansion Valve External Equalizer CR035 Digital Solenoid Valve Hot Gas Discharge Hot Gas Discharge VFD Transducer Sensing Bulb Optional Field Installed Fusible Plug ...

Страница 33: ...ematic representation shown Do not use for specific connection locations 2 One or more additional pressure relief valves are required downstream of any and all field installed isolation Do not isolate any refrigerant circuits from overpressurization protection 3 Refer to outdoor condenser documents above for proper trap placement Hot Gas Discharge Liquid Return For rises over 25ft 7 6m trap every ...

Страница 34: ...vaporator Coil Digital Scroll Compressor Rotalock Valve Rotalock Valve High Pressure Switch Vibration Absorber Vibration Absorber High Pressure Transducer CR020 Digital Solenoid Valve Water Glycol Return Top Connection Water Glycol Return Bottom Connection Water Glycol Supply Bottom Connection Water Glycol Supply Top Connection Filter Drier Solenoid Valve Expansion Valve External Equalizer Receive...

Страница 35: ...ific connection locations 3 Way Motorized Ball Valve Configuration Plug Pipe Chilled Water Return Top of Unit Connection Plug Pipe Chilled Water Return Bottom of Unit Connection Plug Pipe Chilled Water Supply Bottom of Unit Connection Plug Pipe Chilled Water Supply Top of Unit Connection Air Bleed Valve Chilled Water Coil 2 Way Motorized Ball Valve Configuration DPN001986 Rev 2 ...

Страница 36: ... s ID Do not expose drain line to freezing temperatures Drain line may contain boiling water Use copper or other suitable material Drain line must comply with local building codes Emerson recommends installing monitored under floor leak detection equipment Condensate Pump 600mm 24 Models 1 2 copper sweat connection is provided on units with optional factory installed condensate pump Condensate pum...

Страница 37: ...rain a minimum of 1 8 3mm per 1 foot 305mm of length Drain is trapped internally Do not trap the drain external to equipment Drain line must be sized for 2 gpm 7 6 l m flow Figure 19 Gravity drain piping 600mm 24 and 300mm 12 units CORRECT INCORRECT UNIT Internal Drain External Drain Continuous Downward Slope Internal Drain UNIT UNIT External Drain Internal Drain External Drain These are external ...

Страница 38: ... drain pan and overflow the unit cabinet Figure 20 Gravity drain connection 300mm 12 DX units without condensate pump 5 2 4 Humidifier Supply Water Optional Steam Generating Canister 600mm 24 Models 1 4 supply line maximum water pressure is 145psi 1000kPa Fill valve is sized for pressure range of 30 to 120psi 207 827kPa Do not supply steam generating humidifier with softened water Do not use hot w...

Страница 39: ...w individual unit installation instructions for precautions regarding fluid system design material selection and use of field provided devices Liebert systems contain iron and copper alloys that require appropriate corrosion protection It is important to have the system running with flow through exchangers maintained at initial system fill for 24 to 48 hours depending on size and system configurat...

Страница 40: ...erson recommends that the unit be isolated using field installed shutoff valves When the Liebert units are included in a leak test use of fluid for pressure testing is recommended When pressurized gas is used for leak testing the Liebert unit the maximum recommended pressure is 30 psig 2 bars and tightness of the unit should be verified by pressure decay over time 2 psig hour 0 3 bars hour or sens...

Страница 41: ... the liquid and suction lines as shown in Figure 24 Cutting these lines disconnects the top connections from the rest of the refrigeration system Air cooled units are shipped with a holding charge of nitrogen 6 1 Piping Guidelines Air Cooled Units Indoor unit ships with a nitrogen holding charge do not vent the evaporator until all refrigerant piping is in place ready for connection to the unit an...

Страница 42: ...or vacuum creation and refrigerant charge 600mm 24 models Figure 22 Connections for vacuum creation and refrigerant charge 300mm 12 DX models Liquid Line Connection Suction and Supply Line Connections High Pressure Switch Pressure Transducer Service Connections for vacuum and charging ...

Страница 43: ... 600mm 24 models Figure 24 Bottom refrigerant piping connections 600mm 24 models Figure 25 Top refrigerant piping connections 300mm 12 DX models Refrigerant Connections 300mm 12 Air Cooled Models For refrigerant piping locations refer to Figure 28 If using bottom connections cut the pipes just below the black pipe clamps Front Rear Supply Return ...

Страница 44: ...which include rubber gaskets Place these clamps every 5 to 7 ft 1 5 to 2m Table 6 Traditional open room 95 F 35 C 23RH return air conditions Indoor Model Unit Width Outdoor Design Ambient Temperature F C 95 35 100 38 105 41 110 43 115 46 120 49 CR019R 300mm 12 MCS028E1 MCM040E1 MCM040E1 MCM040E1 MCL055E1 MCL055E1 CR020A 600mm 24 CR035A MCM040E1 MCL055E1 MCL055E1 MCM080E1 MCM080E1 MCM080E1 300mm 12...

Страница 45: ...d under floor air Outdoor only for aesthetic reasons only if exposed to sun only if exposed to sun Layout See Table 10 Table 10 Liebert CRV position relative to the remote condenser Liebert MC and fin tube condenser with or without Liebert Lee Temp Parameter Maximum Distances ft m From Liebert CRV to condenser 300 91 4 equivalent length From Liebert CRV to VFD condenser Above 60 18 3 Below 15 4 5 ...

Страница 46: ...s Line in mm Liquid Line in mm CR019RA CR020RA 50 15 2 3 4 19 1 5 8 15 9 100 30 5 3 4 19 1 5 8 15 9 150 45 7 3 4 19 1 5 8 15 9 300 91 4 7 8 22 2 3 4 19 1 CR035RA 50 15 2 7 8 22 2 3 4 19 1 100 30 5 7 8 22 2 3 4 19 1 150 45 7 7 8 22 2 3 4 19 1 300 91 4 1 1 8 28 6 7 8 22 2 Consult factory for proper line sizing for runs longer than 300 ft 91 4m equivalent length Must downsize vertical riser one trade...

Страница 47: ...s Tee IDS In Liquid Line to Lee Temp Valve ODS In Receiver Out IDS In MCS028 7 8 5 8 7 8 5 8 5 8 MCM040 7 8 5 8 7 8 5 8 5 8 MCM080 1 1 8 7 8 1 1 8 7 8 1 1 8 MCL055 1 1 8 7 8 1 1 8 7 8 7 8 MCL110 1 3 8 1 1 8 1 3 8 1 1 8 1 1 8 Source DPN002167 Rev 3 Table 14 Piping and refrigerant sizes for Liebert Lee Temp fin tube condensers with R 410A Liebert CRV 600mm 24in Condenser Piping Connection Sizes Cond...

Страница 48: ...ys use large radius curves bending radius at least equal to pipe diameter Bend the pipes as follows soft copper bend by hand or use bending device hard copper use preformed curves To minimize oxidation avoid overheating the pipes when brazing 2 Connect the pipes to the condenser Condensers with butt brazed pipe connections Cut the pipe enlarge it and braze it to the pipeline Respect the direction ...

Страница 49: ...tions Unsolder when connecting through bottom Bottom Connections possible with raised floor Rear DPN001792 Rev 2 HS CP CR GDH or HS 4 13 16 122mm 23 5 8 600mm 2 1 8 54mm LVB LVB2 HVT HVB 8 7 8 226mm 1 1 8 28mm 7 13 16 199mm 3 1 16 77mm 5 127mm 1 3 4 44mm 5 1 8 130mm 9 3 4 248mm 12 3 4 325mm 2 15 16 74mm 2 3 16 56mm 2 11 16 69mm 9 5 16 237mm 3 1 16 77mm 2 11 16 69mm 2 11 16 69mm 2 15 16 74mm 3 1 4 ...

Страница 50: ...r Supply 1 2 FPT top connection 1 4 Compression Fitting bottom connection HVT High Voltage Top Connection Combination Knockout Hole Diameter 1 3 8 35mm 1 3 4 44 5mm and 2 1 2 63 5mm HVB High Voltage Bottom Entrance feed through the base of the unit Knockout Hole Diameter 2 1 2 63 5mm LVT Low Voltage Top Connection Knockout Hole Diameter 7 8 22mm 2 places LVB Low Voltage Bottom Entrance feed throug...

Страница 51: ...ance feed through unit s base Combination Knockout 1 1 8 29mm and 1 3 4 44mm LVT1 Low Voltage Top Connection Knockout Hole Diameter 2 places 7 8 22mm LVB1 Low Voltage Bottom Connection Knockout Hole Diameter 7 8 22mm LVT2 Low Voltage Top Connection Knockout Hole Diameter 2 places 7 8 22mm LVB2 Low Voltage Bottom Connection Knockout Hole Diameter 7 8 22mm Source DPN002813 Rev 2 A 3 76mm Front of Un...

Страница 52: ...mperatures R 410A lb ft kg m 95 F 35 C 115 F 46 C 135 F 57 C 1 2 x 0 049 12 x 1 0 05 0 08 0 05 0 07 0 04 0 07 9 16 x 0 049 14 x 1 0 0084 0 0124 0 07 0 11 0 07 0 11 0 06 0 10 5 8 x 0 049 16 x 1 0 0114 0 0169 0 10 0 16 0 10 0 14 0 09 0 13 3 4 x 0 049 18 x 1 0 0149 0 0221 0 14 0 20 0 13 0 19 0 11 0 17 7 8 x 0 065 22 x 1 25 0 0232 0 0346 1 1 8 x 0 065 28 x 1 5 0 0392 0 0584 Liquid pressure and density...

Страница 53: ... code and pull an initial deep vacuum on the system with a suitable pump 5 After four hours check the pressure readings and if they have not changed break vacuum with dry nitrogen Pull a second and third vacuum to 500 microns or less Recheck the pressure after two hours After completing this step proceed to the appropriate section 6 7 Calculating Charging Values for Liebert MC Condenser Systems Un...

Страница 54: ...e starting the unit Do not exceed the calculated charge by more than 0 5 lb 37kg NOTICE Risk of improper refrigerant charging Can cause equipment damage Refrigerant R 407C and R 410A are blended refrigerants and must be introduced and charged from the cylinder only as a liquid When adding liquid refrigerant to an operating system it may be necessary to add the refrigerant through the compressor su...

Страница 55: ...d line pressure reading into a temperature by utilizing a Pressure Temperature Guide or Table 25 The difference between this converted temperature and the actual temperature will determine the system s subcooling For R 407C make sure to use the saturated liquid temperature to calculate subcooling Table 23 Target subcooling for ambient outdoor temperature Ambient Temp F C Subcooling F C 0 17 8 22 1...

Страница 56: ... add additional charge If Line 10 Difference value is greater than 3 F 1 7 C the system is overcharged and some of the charge must be removed 9 As head pressure builds the variable fan speed controlled condenser fan begins rotating The fan will run at full speed when sufficient head pressure is developed Refrigerant Type R 410A 1 Ambient Temperature 94 8 F 34 9 C 2 Condenser Elevation 40ft 12 2m 3...

Страница 57: ...34 2 300 20 7 95 8 35 5 310 21 4 98 1 36 7 320 22 1 100 3 38 0 330 22 8 102 5 39 2 340 23 4 104 6 40 3 350 24 1 106 7 41 5 360 24 8 108 7 42 6 370 25 5 110 7 43 7 380 26 2 112 7 44 8 390 26 9 114 5 45 9 400 27 6 116 4 46 9 500 34 5 133 5 56 4 600 41 4 148 1 64 5 Values are for saturated liquid Source DPN002411 Rev 3 Circuit 1 Refrigerant Type 1 Ambient Temperature 2 Condenser Elevation 3 Condenser...

Страница 58: ...g to obtain Corrected Subcooling Verification Against MC Condenser Subtract Line 7 MC Condenser Subcooling Reading from Line 9 Corrected Subcooling to obtain Difference If Line 10 Difference value is less than 3 F NO charge adjustment is needed If Line 10 Difference value is greater than 3 F add additional charge If Line 10 Difference value is greater than 3 F remove charge Circuit 1 Line 5 Line 6...

Страница 59: ...ight glass between the charging hose and the compressor suction service valve This will permit adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor to enter the compressor 5 Turn On unit disconnect switch Operate the unit for 30 minutes using the charging function in the diagnostic section of the Liebert iCOM control see Figure 91 The charging function o...

Страница 60: ...rtant to have the system running with flow through exchangers maintained at initial system fill for 24 to 48 hours depending on size and system configuration Water chemistry varies greatly by location as do the required additives called inhibitors that reduce the corrosive effect of the fluids on the piping systems and components The chemistry of the water used must be considered because water fro...

Страница 61: ... the drain Drain is trapped internally Do not trap the drain external to the equipment Fill the drain trap with water Humidifier optional See Appendix A Humidifier 600mm 24 Units Only 7 2 Glycol Mixture Add ethylene glycol or propylene glycol to the circuit in the percentages shown in Table 28 Table 28 Glycol mixtures Glycol Percentage by Volume Ethylene Glycol Freezing Temperature F C Propylene G...

Страница 62: ...orative cooling tower unless the water hardness is controlled The water pressure must be 29 145psi 2 10 bar If water pressure is outside this range contact Emerson for technical support The required water flow at different temperatures is available from Emerson If water temperature is very low insulate both pipes 7 3 2 Notes for Closed Circuit Applications Install a pump system calculated on the b...

Страница 63: ... 8mm 2 places LVB2 Low Voltage Bottom Entrance feed through the base of the unit Knockout Hole Diameter 1 3 4 44 5mm 1 place Source DPN001793 Rev 2 HVT LVT LVT HS CP CR CS GDH or HS CR Piping and electrical connections available at the top and bottom of unit Install a 16 20 mesh strainer in an easily accessible location on the Water Glycol Supply to prevent particles from entering the heat exchang...

Страница 64: ...r precautions regarding fluid system design material selection and use of field provided devices Liebert systems contain iron and copper alloys that require appropriate corrosion protection It is important to have the system running with flow through exchangers maintained at initial system fill for 24 to 48 hours depending on size and system configuration Water chemistry varies greatly by location...

Страница 65: ...es Insulate both tubes Install shutoff ball valves on the inlet and outlet pipes to ease maintenance Install optional thermostats and pressure gauges on the inlet and outlet pipes Install a water drain tap at the lowest point in the circuit Fill the circuit with water or glycol Figure 33 Chilled water circuit Tubing Support Water Drain Tap Ball Valves Thermostat Pressure Gauge Insulation Liebert C...

Страница 66: ...2mm 4 Places LVB Low Voltage Bottom Entrance feed through the base of the unit Knockout Hole Diameter 1 3 32 27 8mm 2 Places LVB2 Low Voltage Bottom Entrance feed through the base of the unit Combination Knockout Hole Diameter 1 3 4 44 5mm 1 Place Source DPN001794 Rev 2 Piping and electrical connections available at the top and bottom of the unit TOP CONNECTIONS BOTTOM CONNECTIONS possible with ra...

Страница 67: ... Terminals 3 and 50 2 and 51 5 and 55 or between 3 and 56 Use Class 1 field supplied wiring Terminals 3 and 56 are used for humidifier alarm when a humidifier is installed The remaining terminals are available for customer alarm inputs such as smoke sensors and building fire alarms 10 Common Alarm On any alarm normally open dry contact is closed across Terminals 75 and 76 for remote indication 1A ...

Страница 68: ...als 82 and 83 for lockout of reheat and humidifier 16 Additional Common Alarm On any alarm one additional normally open dry contact is closed across Terminals 94 and 95 for remote indication 1A 24VAC maximum load Use field supplied Class 1 wiring NOTICE Risk of improper input power Can cause equipment damage The electronically commutated motors included in the Liebert CRV unit included in 480V CR0...

Страница 69: ...14 15 10 8 Not Used Not Used Factory Terminals 16 4 Unit Top Unit Front Unit Front OVERLOAD PROTECTORS CONTACTORS UNIT DISCONNECT SWITCH 1 3 32 28mm knockout 2 1 2 64mm knockout 1 3 4 44 5mm knockout Refer to 9 1 1 Standard Electrical Connections 600mm 24 models and 9 1 2 Electrical Connections for Optional Features 600mm 24 models for keys to numbered components ...

Страница 70: ...ontrol Board and Terminal Strip Condenser Heat Rejection Interlock B Factory Wiring Between Liebert iCOM and Terminal Strip Liebert CRV Indoor Unit COMPONENT NOTES 1 Component appearance orientation and position may vary Terminal names and callouts remain constant CABLE NOTES A 1 Field Supplied Cable Shielded 22 18awg Stranded Tinned Copper Twisted Pair minimum 8 twists per foot Low capacitance 15...

Страница 71: ...essor operation normally open dry contact is closed across Terminals 70 and 71 to heat rejection equipment 1A 24VAC maximum load Use field supplied Class 1 wiring 12 CANbus Connector Terminal block with Terminals 49 1 CAN H and 49 3 CAN L SH shield connection The terminals are used to connect the CANbus communication cable field supplied from the indoor unit to the Liebert MC Condenser Premium Mod...

Страница 72: ...ff VIEW B B Lower terminals DPN002810 Pg 3 Rev 2 VIEW B B Upper terminals Air Water and Glycol units only Factory Terminals Refer to 9 1 3 Standard Electrical Field Connections 300mm 12 DX Models and 9 1 4 Electrical Field Connections for Optional Features 300mm 12 DX Models for keys to numbered components Rear View See Figure 38 for low voltage field wiring routing into the unit SOME COMPONENTS N...

Страница 73: ...Electrical Connections 63 Liebert CRV Figure 38 Low voltage field wiring routing into the unit 300mm 12 DX Low Voltage Field Wiring Low Voltage Knockout Factory Wiring ...

Страница 74: ...late power from the unit even in the Unit Off mode Some internal components require and receive power even during the Unit Off mode of the Liebert iCOM control The factory supplied optional disconnect switch is inside the unit The line side of this switch contains live hazardous voltage potential Install and open a remote disconnect switch and verify with a voltmeter that live hazardous voltage po...

Страница 75: ...24 models Figure 40 Remove electrical panel and lower front panel 600mm 24 models Serial Tag 600mm 24 Unit Remove these bolts to access low voltage electrical panel Remove these bolts to access high voltage electrical panel Remove these bolts to open lower front baffle panel ...

Страница 76: ...h must be turned Off before electric box will slide out Main Disconnect Switch locks electrical panel position switch must be Off before turning quarter turn lock electric panel must be fully inside the Liebert CRV before switch can be turned On Low voltage electrical panel Rear of Liebert CRV 300mm 12 Unit Filters Installed Rear of Liebert CRV 300mm 12 Unit Filters removed for access to electric ...

Страница 77: ...ovides access to the electrical panel Low voltage cables are routed through a channel in the side panel to connect the bottom of the unit to the electrical panel High Voltage Bottom Entry Knockout Low Voltage Bottom Entry Port High Voltage Top Entry Port Low Voltage Top Entry Port High Voltage Cable Path Low Voltage Cable Path to Electrical Panel Liebert IntelliSlot Bays ...

Страница 78: ...ntry High Voltage Wire Routing Bottom Entry Point SOME COMPONENTS NOT SHOWN FOR CLARITY General wire routing paths shown Wiring must be run in conduit and must be inside Liebert CRV frame and panels Attach conduit to inside of rails with cable ties Control wiring must be run in separate conduit from power wiring Refer to Figure 45 for bottom entry wire routing Rear ...

Страница 79: ...ctrical Connections 69 Liebert CRV Figure 44 Liebert IntelliSlot cable routing Top entry 300mm 12 DX models Low voltage field wiring twisted pair Low voltage field wiring twisted pair DPN002814 Pg 1 Rev 3 ...

Страница 80: ...ble Low voltage field wiring twisted pair SOME COMPONENTS NOT SHOWN FOR CLARITY General wire routing paths shown Wiring must be run in conduit and must be inside Liebert CRV frame and panels Attach conduit to inside of rails with cable ties Shielded cable may be used If not control wiring must be run in separate conduit from power wiring Secure the control wiring or conduit to the bottom edge of t...

Страница 81: ...n Short circuit at the motor output When any of these failures occurs the motor stops electronically with no potential for separation and the status relay is released The unit does not restart automatic automatically To reset the alarm the power supply must be switched Off for 20 minutes once motor is at standstill Input power undervoltage detection If the utility power falls below 3ph 290VAC typi...

Страница 82: ... Figure 46 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 46 Temperature sensor protection ...

Страница 83: ...connections of the phases supplying the corresponding digital scroll compressor which accepts only one direction of rotation 16 Ensure that the fans rotate in the correct direction see arrow on fan 17 Ensure that all control system settings are correct and that there are no alarms see Liebert CRV system screen Figure 56 18 W Models Only Verify the water flow is adequate 19 W Models Only For closed...

Страница 84: ...d current draws b All air water temperatures indoor and outdoor c All refrigerant and water glycol pressures d All levels of refrigerant and oil in sight glasses e Record refrigerant pressure switch settings and operating pressures f Record superheat and sub cooling 10 2 Automatic Restart The Liebert CRV may be set up through the Liebert iCOM to automatically restart on the return of power after a...

Страница 85: ...Startup 75 Liebert CRV Figure 48 Refrigerant line components 300mm 12 DX models Pressure Transducer Sight Glass Solenoid Valve Thermostatic expansion valve Pressure Transducer ...

Страница 86: ...rtup to direct air toward the racks the cooling unit is intended to condition Ideally these should be the same racks the cooling unit is pulling hot air from The baffles can be readjusted at any time as cooling needs change NOTE In the event of control system failure the valve can be manually controlled with the ball valve handle It can be used to drive the actuator into any position between 0 and...

Страница 87: ...les on 600mm 24 Models To adjust the baffles on 600mm 24 models 1 Open the door containing the Liebert iCOM display 2 Remove the two screws holding a baffle panel segment in place 3 Slide out the baffle segment 4 There is one screw on each side of the baffle as shown in Figure 50 Remove the screws and rotate the baffle segment around its horizontal axis to change the airflow direction 5 Reinsert t...

Страница 88: ...horizontal axis to change the airflow direction 6 Reinsert the baffle panel 7 Repeat for all baffles to be changed 8 Reinstall the screws in the metal brace Figure 51 Adjust the baffles to ensure correct airflow direction 300mm 24 models NOTE The air baffles on 300mm 12 units may be changed to direct air either right or left B DPN002809 Rev 1 Inside View Remove screws rotate baffles to desired air...

Страница 89: ...ght side of the display door or it can be removed to discharge air left and right Figure 52 Adjust air blocking plate 600mm 24 models To adjust the air blocker 1 Remove the three screws that attach the blocker plate to the display door 2 Reattach the blocker plate to the other side of the display door or to remove it Perforated Supply Air Opening Air Blocker Installed Over Perforation Attachment S...

Страница 90: ...ucing unnecessary energy consumption Each Liebert CRV includes three 2T rack temperature sensors to monitor three racks A total of ten 2T temperature sensors can be connected to each cooling unit to monitor every rack a Liebert CRV is protecting When multiple cooling units are connected in a Unit to Unit Liebert iCOM control network all sensor data is shared to optimize their performance as a syst...

Страница 91: ...Key Up Arrow Moves upward in a menu or increases the value of a selected parameter Decrease Key Down Arrow Moves downward in a menu or reduces the value of a selected parameter Left and Right Arrow Keys Navigates through text and sections of the display Upper LED Blinking Red Active unacknowledged alarm exists Solid Red Active acknowledged alarm exists Lower LED Solid Amber Power is available to t...

Страница 92: ...lling Liebert cooling units or network of cooling units The control is broken out into three major menus User Service and Advanced menus The User menu contains the most frequently used features settings and status information See Figure 54 for a menu overview Figure 54 User menu icons and descriptions Setpoints View and change temperature and humidity setpoints Spare Part List Displays the various...

Страница 93: ...ance Wellness Settings Allows setting maintenance interval reminder maintenance message number of unit starts and stops and time since last maintenance Diagnostics Service Mode Allows troubleshooting manual mode read analog and digital inputs Set Alarms Allows enable disable and settings for alarms Sensor Calibration Setup Allows calibration of sensors System Network Setup Allows setup and U2U com...

Страница 94: ...the disconnect or the user escapes from a submenu User Service or Advanced Pressing the Down arrow or Enter key from the unit view allows the user to enter the User menus From the user menu the Service and Advanced Menu can be accessed by pressing the Right arrow key The menu name will be displayed on the upper right corner of the screen Using the Left arrow key returns to the previous menu Figure...

Страница 95: ...t iCOM control menus for a stand alone large display and for a networked large display respectively The Up and Down arrow keys may be used to scroll through the parameters page by page if the submenu has ore than one page To scroll item by item press the Enter key and use the Up and Down arrow keys If multiple units are connected in a Liebert iCOM U2U network pressing the Right arrow key brings up...

Страница 96: ...Liebert iCOM Control Liebert CRV 86 Figure 59 Screen transition EVENT LOG C F RH SET SET 1 2 3 9 6 SET ALARMS ACTIVE ALARMS USER MENUS 1234 h ESC ESC ESC ESC ESC ESC ESC ESC ...

Страница 97: ...a Active Alarms Display Setup Total Run Hours Service Contact Info Condenser Timer Service Menu Unit 1 Setpoints Unit Diary Standby Settings Lead Lag Maintenance Wellness Settings Diagnostics Service Mode Set Alarms Sensor Calibration Setup System Network Setup Options Setup Rack Setup Service Contact Info Humidifier Settings Advanced Menu Unit 1 Compressor Info MBV Settings Change Passwords Runti...

Страница 98: ...system view press either the Enter key ESC key or Down arrow key When this is done the word System appears in the top left of the screen The Left and Right arrow keys toggles through the various units on the network To go back to the System view from any unit view press the Up arrow Figure 61 Liebert CRV system screen MAIN MENU SYSTEM MENU Summary of Rack Sensor Reading Last Two Events Warnings or...

Страница 99: ...Setup Total Run Hours Service Contact Info Condenser Timer User Menu Unit 1 Password Setpoints Unit Diary Standby Settings Lead Lag Maintenance Wellness Settings Diagnostics Service Mode Set Alarms Sensor Calibration Setup System Network Setup Options Setup Rack Setup Service Contact Info Humidifier Settings Advanced Menu Unit 1 Password Compressor Info MBV Settings Change Passwords Runtime Monito...

Страница 100: ...rack sensors unit operation with a rack sensor summary historical temperature and humidity trending The Liebert CRV display will always revert to the Unit Screen The following screens selections are for user preference The rack view should be used only when remote rack sensors are connected The System screen can be accessed by pressing the Up arrow key when the Unit screen is displayed The System ...

Страница 101: ...y Temperature and Humidity Last Two Events Warnings or Alarms Fan Speed Next Recommended Maintenance Date Cooling Capacity Summary of Rack Sensor Reading GDR VIEW Historical Supply Air Temperature Graph Historical Supply Air Humidity Graph RACK VIEW Humidification Individual Rack Sensor Temperatures Graphs are empty at 68 F 20 C and full at 77 F 25 C ...

Страница 102: ...Supply Air Temperature and Humidity Supply Temperature and Humidity Last Two Events Warnings or Alarms Fan Speed Next Recommended Maintenance Date Cooling Capacity Next Recommended Maintenance Date Fan Speed Cooling Capacity Last Two Events Warnings or Alarms GRAPHICAL DISPLAY SIMPLE DISPLAY ...

Страница 103: ...cooling capacity based on the supply sensor and use the remote rack sensors to ensure that cool air is being delivered to the racks inlet Using the supply and remote rack sensors in this decoupled mode is the preferred method for controlling the Liebert CRV in a hot cold aisle configuration In addition to this configuration Emerson has provided additional flexibility for other applications shown i...

Страница 104: ...the humidity setpoint to 45 with a 10 to 20 deadband This will control the moisture content well inside the AHSRAE standard 4 Set S102 Temperature Setpoint to the desired value 5 Adjust S125 Fan Delta as needed If the control is running in coupled mode per Table 33 S125 will be masked out This is because the fan and temperature settings are the same and both will be controlled by S102 If the unit ...

Страница 105: ...or combinations The Liebert CRV controls cooling output by monitoring a temperature control sensor set on line S103 compared to the user programmed temperature setpoint on either line U202 or S202 The degree of cooling is determined by the temperature control band The temperature control band is established using the following formula and control lines S102 Temperature Setpoint 1 2 S105 Temperatur...

Страница 106: ... temperature sensors Manual Fan Control Cooling off supply remote or return sensor are permitted in manual fan speed control Manual control of the Liebert CRV s fan speed can be achieve in two ways Manually setting the fixed speed at the local display OR Remote monitoring To control the fan manually using either method locate Service menus Setpoints line S124 Fan Control Type The factory default i...

Страница 107: ...iebert iCOM will ramp fan speed to 100 during a call for reheat or humidification On DX models of the Liebert CRV a unique freeze protection algorithm will increase fan speed if the compressor pressure gets too low This feature increases system reliability and helps to provide partial cooling if a low side refrigerant issue occurs In a single fan fails the Liebert CRV will ramp the remaining opera...

Страница 108: ...ers screen U102 Controlling Sensor Allows the user to select which sensor will be used to determine the amount of cooling needed This parameter can select only a single sensor for both the temperature and fan speed control Use the Service Setpoints menu to decouple the operation of fan speed to the remote sensors and the cooling capacity to the supply sensor U103 Temperature Setpoint Allows select...

Страница 109: ...he event log has two views a system view and a unit view When the event log is first entered the system view is displayed The system view shows a list of events that have occurred at the unit and other units if configured in a U2U network Pressing the Right arrow while viewing the event log for the system view allows the user to see unit specific events The unit name and number will appear in the ...

Страница 110: ...e the unit s name If no name is given only the unit number will be displayed Figure 74 User menus Network screen Sensor Data Figure 75 User menus Sensor data parameters screen EVENT LOG C F RH SET SET 1 2 3 9 6 SET ALARMS ACTIVE ALARMS USER MENUS 1234 h Sensor Data Chilled Water Models Sensor Data DX Models EVENT LOG C F RH SET SET 1 2 3 9 6 SET ALARMS ACTIVE ALARMS USER MENUS 1234 h ...

Страница 111: ... Temp The temperature reading of the actual sensor that is referenced to U303 This parameter automatically changes based on the control sensor settings Auto or De coupled U305 Humidity Setpoint Allows selecting a humidity that the cooling unit will maintain by removing or adding moisture to the air This parameter is adjustable from 20 55 The default setting is 45 U306 Actual Return Humidity The re...

Страница 112: ... the audible noise frequency of the built in buzzer When adjusting the buzzer frequency the buzzer will sound allowing you to select a frequency that is easily detected when an alarm occurs U407 Backlite Off After Controls the length of time that the backlight remains active when the control is unused When the buttons on the front display have not been pressed for the time selected in this paramet...

Страница 113: ...802 is set to YES U804 Whole Days Selects the whole day s low noise operations will be available for the condenser fan When the parameter is set to YES the low noise operation is selected for the whole day When set to NO the low noise will be disabled NOTE The low noise feature will be overridden if a high pressure condition occurs This is a safeguard to ensure optimal control of the conditioned s...

Страница 114: ...ays The default set value is 0 days OFF U815 Reverse Fan At Defines what time the fan reversal will be performed in 00 00 to 24 00 U816 Reversal Duration Defines the length of time the fan s will be operated in reverse This parameter is adjustable from 0 999 seconds The default set value is 60 seconds U817 Reverse Fans Now Performs a rotation when parameter is set to YES When selection is set to Y...

Страница 115: ...iCOM user manual updates Figure 81 Service menus Setpoints parameters screen Page 1 S102 Temperature Setpoint Selects a temperature that the cooling unit will maintain by applying cooling and or reheats This parameter is adjustable from 45 104 F 7 2 40 C The factory default setting is 68 F 20 0 C S103 Temperature Control Sensor Designates which sensor will drive the compressor capacity Settings Su...

Страница 116: ...upply THEN set 45 IF _S103 TempSensTy 1 Remote THEN set 45 IF _S103 TempSensTy 2 Return THEN set 25 S114 Humidity Control Type Selects the humidity control calculation It can be set to Proportional or PI proportional integral only The Liebert CRV assumes the current humidity at the control sensor by calculating the return air dew point and then taking the temperature setpoint of the selected cooli...

Страница 117: ...oint Also it can set to 1 Proportional integral control which is also available and works in the same manner as the temperature control integral term S127 Fan Delta Sets the fanspeed setpoint The delta accounts for the temperature rise from the Supply Air Sensor and the Remote Rack sensors by adding the Fan Delta to the Temperature Setpoint S102 This eliminates the possibility of setting the remot...

Страница 118: ...ll for fan reaches 100 S137 High Temp Limit Approach Sets the sensor that controls the fan speed maximum override This can be set to 0 Disabled 1 Supply Sensor and 2 Return Sensor S138 High Temp Limit Approach at Sets the temperature 0 10 F when the units fan speed can operate above the maximum speed Defines a temperature differential below the High Supply or Return Temp Limit where the fan speed ...

Страница 119: ...ate by Example If there are six units in a unit to unit network and Units 1 3 and 5 are in standby and this parameter is set to 1 at the next rotation units 2 4 and 6 will be placed in standby and units 1 3 and 5 will begin operating S506 Perform one Rotation Manually forces a single rotation between units S515 Cascade Units Allows standby units to activate if the active units are unable to mainta...

Страница 120: ...eps a running total of component working hours and the number of times it has been started Liebert iCOM relates that data to the optimum maximum starts per hour Accordingly Liebert iCOM will increase or decrease the time before the next service call will be needed The more frequently a component starts the sooner it is likely to need maintenance If for example a unit s fan runs continuously but it...

Страница 121: ...P Alarms counts the low pressure alarms between two service intervals Number of TH Alarms counts the thermal protection alarms between two service intervals Actual Bonus is calculated from number of starts and average working time Can be positive bonus or negative penalty This value influences the time remaining to the next maintenance Figure 86 Service menus Wellness basic settings screen Page 1 ...

Страница 122: ...ber of Starts Shows the number of starts for the unit s compressor S025 Run Hours Shows the number of run hours for the unit s compressor S026 Average Run Time Displays the average run time of the unit s compressor S027 Starts per Day Best Displays the lowest number of starts in a rolling 24 hour period S028 Starts per Day Worst Displays the highest number of starts in a rolling 24 hour period S02...

Страница 123: ...r the unit s reheats The unit will always take the value from the worst component for the next maintenance indication Figure 90 Service menus Wellness humidifier settings parameters screen Page 5 S046 Number of Starts Shows the number of starts for the unit s humidifier S047 Run Hours Shows the number of run hours for the unit s humidifier S048 Average Run Time Displays the average run time of the...

Страница 124: ... for 12 hours A message is generated Dehum Suspended 12hrs The message can be disabled in the Service Set Alarms menu The counter resets to 0 on a power cycle and can be manually reset via Display When Dehum is enabled again a message is be generated Dehum Resumed The message can be disabled in the Service Set Alarms menu S306 Low Supply Temperature Counter It increases by 1 each time the low supp...

Страница 125: ...key The compressor state to the far right must be placed to On if Run Mode or Charge Mode has been selected No further action is required for Evacuate Mode Run Mode Allows the compressor to run at any given capacity The compressor capacity can be adjusted on line S317 Evacuate Mode Allows all solenoid valves in the refrigerant circuit to open while the compressor remains Off This mode is can be us...

Страница 126: ...Actuator Open This setting will open the 3P type chilled water actuator to 100 S338 must be set to Off before setting S337 to On not shown on DX models S338 3P Actuator Close This setting will open the 3P type chilled water actuator to 100 S338 must be set to Off before setting S337 to On not shown on DX models S339 Current Fanspeed Read only Shows the analog output for the fan in automatic mode S...

Страница 127: ... and 353 Status Customer Input 1 2 3 and 4 This shows the status of the unit s customer inputs S354 Status LSI LSI Level Sensor Isolator shows for a bottle humidifier whether the water level is OK or FULL Full does not necessarily mean that the bottle is to be replaced it just stops filling to avoid overfill This line does not apply to units manufactured by Liebert North America S355 Status Heater...

Страница 128: ...upply air temperature It is ignored if the compressor DX models is not in operation the chilled water valve opening is less than 20 chilled water models within the first 5 minutes of a cooling call or if the electric heaters are energized S207 Low Supply Temperature Sets the low temperature threshold that will trigger an alarm on the Liebert iCOM and any monitoring system that may be connected Thi...

Страница 129: ...mer inputs Each event reflects a different alarm and possible action to the unit Refer to 14 1 Alarms Events for a description of selectable options S214 S216 S218 and S220 Customer Input 1 2 3 and 4 active when These parameters select whether the input is a normally closed or normally closed input Figure 101 Service menus Set alarms parameters screen Page 3 Service Set Alarms Pages 3 6 determine ...

Страница 130: ...04 Service menusFigure 89 Sensor calibration setup parameters Page 1 S602 Return Temperature Adjusts the return temperature reading from the actual sensor to compensate for any error of the sensor or to match other sensors in the room S630 Calibrated Return Temperature Shows the adjusted temperature value of the return sensor This value is the actual sensor reading or the offset Return Temperature...

Страница 131: ...s the type of sensor that is connected to the unit It is set at the factory as NTC and should be changed only by a certified Emerson technician S617 Supply T Sensor Provides an offset to the actual sensor reading to calibrate the unit s sensor to other sensors S618 Calibrated Supply T Sensor Shows the reading after the offset has been added to or subtracted from the actual sensor reading S619 CW T...

Страница 132: ...he Display S802 Number of Connected Units Sets the number of units that will be viewable from the large display 1 32 and will participate on the unit to unit network S803 Teamwork Mode Selects which teamwork mode to use within a selected group Teamwork modes are 0 0 No 1 1 Parallel 2 2 Independent 3 3 Optimized Aisle S804 Teamwork Mode is Based on Two selections are available Average and Maximum A...

Страница 133: ...ebert iCOM board and display connectivity and for a Liebert iCOM U2U network Do not use to configure remote monitoring S814 Netmask Divides IP addresses in subnet and specifies the network available to hosts This setting is used for Liebert iCOM board and display connectivity and for a Liebert iCOM U2U network Do not use to configure remote monitoring S815 Gateway Routes data and acts as a proxy s...

Страница 134: ...n that has monitoring or configuration of that unit S830 Lock for Upgrade Locks the Liebert iCOM functions to permit upgrading its firmware S831 Configuration Safe Saves or loads configuration settings for the control board that have been modified from the factory default to an internal file that can be downloaded uploaded using the Liebert iCOM Service Tool Selecting Save will write the settings ...

Страница 135: ...splay connectivity and for a Liebert iCOM U2U network Do not use to configure remote monitoring S839 MAC Read Only The MAC address is a unique hardware identifier of the Ethernet device S840 U2U Protocol This parameter is always set to GBP Global Bus Protocol S841 U2U Address This parameter is a unique identifier for each unit on the network Display addresses range from 1 to 32 Each display on the...

Страница 136: ...or the Liebert LWD Leakage Water Detector A device that senses water by means of electrical resistance Not available on units manufactured by Liebert North America LQTECH Selection provided for the Liebert Liqui tect LT410 OR LT460 See the Liebert Liqui tect user manual SL 31000 available at Liebert s Web site www liebert com for connection configuration details S409 Water Detector Function allows...

Страница 137: ...g Off the equipment from the User or System view When this parameter is set to Off and the user attempts to turn Off the unit a message will appear stating On Off is disabled The default configuration is On Figure 114 Service menus Options setup parameters Page 3 S424 Chilled Water Quick Start Can be enabled only for chilled water units This function allows to restart a Liebert CRV after a power c...

Страница 138: ...k Start Duration Informational only Shows the time of the last quick start S430 Boot loader Variables IMPORTANT any change of quick start EN to Disable or DIS the Enable must be followed by executing Boot Loader Variables Save and Reboot Figure 115 Service Service Contact Menu NOTE Quick start is performed at each power cycle no matter if the unit was in operation or in an Off state before the pow...

Страница 139: ...SSWORD Country Country None Austria Switzerland D Switzerland F Benelux D Benelux FL Germany France UK Hungary Italy Poland Spain United States Australia New Zealand Indonesia Malaysia Singapore Address line 1 Address line 1 text string Address line 2 Address line 2 text string Address line 3 Address line 3 text string Address line 4 Address line 4 text string ...

Страница 140: ...s are automatically detected when connected and set to Control A maximum of ten 2T temperature and humidity sensors can be connected the control automatically detects the type Control The Liebert CRV is using the sensor for temperature control Reference The sensor value is shown but used only for monitoring Disable No sensor connected ...

Страница 141: ...ntrol and a shared humidity PI for humidification dehumidification Teamwork Mode 2 Independent Avoid units performing conflicting operations For example a units are not allowed to heat if other units are cooling and b units are not allowed to humidify if other units are dehumidifying Teamwork Mode 3 Smart Aisle All units use a shared fan speed PI value and drive cooling from local sensors 12 2 Lie...

Страница 142: ...cable must be connected between the network switch and the P64 port on the back of the display This will enable control and monitoring capabilities to any cooling unit connected to the network Network Switch Liebert Cooling Unit with Large Liebert iCOM Display Liebert Cooling Unit with Large Liebert iCOM Display Liebert Cooling Unit with Large Liebert iCOM Display Display Service Network Liebert i...

Страница 143: ...Operation in Teamwork Mode 133 Liebert CRV Figure 118 U2U network diagram 600mm 24in Liebert CRV ...

Страница 144: ...t CRV 12 4 Teamwork Modes Groups of cooling units connected to a network can be set up to work together in any of four teamwork modes No Teamwork Teamwork Mode 1 Teamwork Mode 2 Teamwork Mode 3 All Liebert iCOM controlled cooling units on a network must be set to run in the same teamwork mode ...

Страница 145: ...by the remote rack sensors of all units providing a controlled delivery method of the air to the cold aisle This distribution is achieved by operating all fans in parallel which will also yield the greatest energy efficiency All units in the same group will run in the same Teamwork Mode 12 4 2 No Teamwork Each cooling unit works independently responding to its own sensors Standby function and unit...

Страница 146: ...m deviates from the setpoints Fans compressors and chilled water valves will operate in parallel as temperature deviates from set point See Figure 121 and paragraphs below for more information The number of available units is calculated like In non standby configuration all units with fan On In typical standby function no cascade all units with fan On In cascade mode all units that could operate n...

Страница 147: ...s according to their own temperature readings and operate cooling off their own unique temperature control bands If some of the units sense a cooler temperature they are permitted to reduce cooling to keep from cooling the space beyond the temperature setpoint If the master determines the greatest demand is for dehumidification the units that require dehumidification are released to operate in tha...

Страница 148: ...can be defined to be Standby the normal status of standby units is Standby Off fan Off If one regular unit has an alarm that is defined to be defined in the alarm configuration to switch On a standby unit the faulty unit will switch Off and the standby unit will switch On If the next unit has an alarm the next standby unit will be started If no more standby units are available the unit with a non ...

Страница 149: ...On Off Local Cooling Capacity Parallel Low Supply Limit Control N A Fanspeed Parallel Re Heat during Dehum Local Humidification Serial Dehumidification Serial Mode D C SUPPLY F REMOTE Teamwork Mode 3 Cooling On Off Local Cooling Capacity Local Low Supply Limit Control N A Fanspeed Parallel Re Heat during Dehum Local Humidification Serial Dehumidification Serial Mode E C SUPPLY F RETURN Teamwork Mo...

Страница 150: ...the cooling unit are avoided There are four steps to setting up a remote rack sensor Determine the location of sensors and mounting See 13 1 DIP Switch Settings Set the DIP switches of the remote rack sensor must be configured to have a unique ID See Sections 13 2 through 13 4 Route the CANbus cables and make the connections at the CRV and 2T sensors mounted on the racks See Sections 13 5 through ...

Страница 151: ...ps head screws Reassemble housing once complete Figure 124 Setting DIP switches for 2T sensors Table 36 DIP switch settings 2T Temperature and Humidity Sensor DIP Switch Position Factory Set to Terminated 1 2 3 4 5 6 7 8 Included with Liebert CRV Sensor 1 Off Off On Off On Off Off Off Sensor 2 On Off On Off Sensor 3 Off On On Off Yes Optional 2T Rack Sensors Sensor 4 On On On Off On Off Off Off Se...

Страница 152: ...ory supplied termination plug or with jumpers 13 3 1 Using the Factory Supplied Plug to Terminate the Last 2T Sensor on a Network The Liebert CRV is furnished with 2T sensors and an RJ 45 termination plug Arrange the sensors and network as detailed in 13 7 Sensor Location and Mounting Insert the termination plug into the RJ 45 connection on the 2T temperature and humidity sensor board see Figure 1...

Страница 153: ...ure 126 Termination jumper setting Unterminated Terminated 3 2 1 3 2 1 Termination Jumper in the Terminated Position Circuit board inside display housing Circuit board inside 2T sensor housing 2T Sensor Housing back DIP switches Screws typically 3 ...

Страница 154: ...ty sensor cover and setting DIP switches Remote Sensor DIP switch and Jumper Locations Sensor DIPswitch and Jumper Locations 123 456 78 P3 SW 1 P6 6 P6 7 Rotated 180 Jumper On 2 3 Off 3 P3 On Switches On 1 5 Switches Off 2 3 4 6 7 8 2 1 1 2 3 4 5 6 7 8 See Detail Area DETAIL AREA 192738 Rev 4 ...

Страница 155: ... away from the nearest connection point A maximum of 150 feet of interconnecting CAN cables can be connected to a single Liebert CRV CANbus Cables Shielded cable consists of three pairs of twisted wires with a six pin RJ 12 connector NOTICE Risk of improper wiring Can cause equipment damage Mismatching wire pins at the RJ12 connection will damage the CAN device Extreme caution should be taken when...

Страница 156: ...Green Notes 1 Length tolerances for each dimensioned segment are 25 up to 12 00 50 for 12 00 to 24 00 and above 24 00 is equal to 1 0 2 Wire identification numbers or letters are hot stamped on each end of a wire 3 Any wire not terminated into a terminal connector is provided with a strip length of 50 4 Assembly must be provided in accordance with latest revision of Emerson engineering specificati...

Страница 157: ...CANbus wire into the cooling unit 600mm 24 Connect the 10ft CAN wire to the open CAN bus port on the rear of the Liebert iCOM Ensure there is enough slack in the wire to allow the door to open and close freely but not so much that the wire could be in a bind or pinched when the door is shut Emerson recommends securing the wiring with cable ties Connect the other end of the 10ft 3m CAN cable to the...

Страница 158: ...sors to each other Avoid using excessive lengths of cable between sensors The order in which the 2T temperature and humidity sensors are attached does not matter However the last sensor connected must be set to terminated Refer to 13 3 Terminating the Last 2T Sensor on a Network for details WARNING Arc flash and electric shock hazard Can cause injury and death Disconnect all local and remote elect...

Страница 159: ... the middle of the door width and height If the rack is partially filled with equipment locate the sensor in the center of the equipment on the front door Do NOT Install a sensor in the hot aisle Leave a sensor coiled on top of or inside the rack With the temperature sensors in place neatly route the wires up the rack door and into the rack securing them with the supplied cable ties Be sure to lea...

Страница 160: ...305mm Install temperature sensors on the perforated portion of the rack door using the supplied zip ties Ensure that the door can swing freely without binding the cables Approximate center of rack in front of IT equipment 2T Sensor Chain DPN001983 Rev 1 600mm 24 Liebert CRV s shown arrangement is same for 300mm 12 units ...

Страница 161: ...ting plug into last sensor Install CAN cable into the slot previously occupied by the terminating plug Liebert IntelliSlot temperature sensor located in the rear of the unit Bottom inlet see DPN002813 for Air Water Glycol units and DPN002815 for Chilled Water units Install temperature sensors on the perforated portion of the rack door using the supplied wire ties Ensure door can swing open freely ...

Страница 162: ...nsor Setup page 1 of 1 Once the remote rack sensors have been configured and plugged into the CANbus 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 ...

Страница 163: ...any of the temperature sensors The supply temperature is an accurate representation of the actual heat rejection the Liebert CRV needs to perform Chilled water Liebert CRV models will modulate the cooling capacity from 0 to 100 and DX models will modulate the cooling capacity from 20 to100 compressor capacity To avoid short cycling the compressor during room heat load changes the Liebert CRV will ...

Страница 164: ...r 600mm 24 Units Only The Liebert CRV s humidification is activated when the measured temperature and humidity sensor has been calculated to exceed the corresponding dew point setpoint The dew point setpoint is calculated based on the temperature and humidity of the sensor set to control the control setpoint and relative humidity Example Temperature Setpoint 72 F Humidity Setpoint 50 52 F Dew Poin...

Страница 165: ...8 Failure Unit 20 Disconnected Cond Pump High Water Humidifier High Amps Rack Sensor 9 Failure Unit 21 Disconnected Condenser 1 Failure Humidifier Lockout RAM Battery Fail Unit 22 Disconnected Control Valve Failure Humidifier Low Amps Reheat Lockout Unit 23 Disconnected Customer Input 1 Humidifier Low Water Room Humidity Problem Unit 24 Disconnected Customer Input 2 Humidifier Problem Room Sensor ...

Страница 166: ...e threshold Compressor 1 Low Pressure Transducer Issue Compressor 1 low pressure transducer is disconnected or the signal is out of range Compressor 1 Low Suction Pressure Compressor 1 low suction pressure Compressor 1 Pump Down Issue Unable to pump down suction side pressure during compressor 1 shutdown Compressor 1 Short Cycle Compressor 1 short cycle A short cycle is defined as turning on and o...

Страница 167: ...ating hours for the dehumidifier have exceeded the threshold Dehumidifier Utilization Present dehumidifier utilization expressed as a percentage of the maximum rated capacity Dig Scroll Comp 1 Over Temp Digital scroll compressor 1 shut off because its head temperature has exceeded the upper threshold Dig Scroll Comp 1 Temp Sensor Issue Digital scroll compressor 1 temperature sensor is disconnected...

Страница 168: ...ification or dehumidification will occur Humidity Set Point Desired relative humidity Loss of Air Flow No air flow through the unit due to failure of all fans Low Return Humidity Threshold Threshold value used in the Low Return Humidity event Low Return Humidity Return air low humidity event Maintenance Completed Maintenance has been completed on the unit Maintenance Due The calculated maintenance...

Страница 169: ...event Supply Chilled Water Loss of Flow Supply chilled water flow is too low Supply Chilled Water Over Temp Threshold Threshold value used in the Supply Chilled Water Over Temp event Supply Chilled Water Over Temp Supply Chilled Water Temperature has exceeded Supply Chilled Water Over Temp Threshold Supply Chilled Water Temperature Supply chilled water temperature Supply Fluid Temp Sensor Issue Th...

Страница 170: ...he point the TEV bulb is clamped 2 Obtain the gauge pressure at the compressor suction valve 3 Add the estimated pressure drop between the bulb s location and the suction valve 4 Convert the sum of the two pressures to the equivalent temperature 5 Subtract this temperature from the actual suction line temperature The difference is superheat 15 1 2 Adjust Superheat Setting with the TEV To adjust th...

Страница 171: ... The Liebert 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 the Liebert iCOM control The factory supplied optional disconnect switch is inside the unit The line side of this switch contains live hazardous voltage potential Install and open a remote disconnect switch and verify wi...

Страница 172: ...pful in judging whether active corrosion is occurring The complexity of water glycol solution condition problems and the variations of required treatment programs make it extremely important to obtain the advice of a competent and experienced water treatment specialist and follow a regularly scheduled coolant fluid system maintenance program It is important to note that improper use of water treat...

Страница 173: ...r Check cylinder and pan X Check condition of steam hoses X Verify filling solenoid valve is operating properly X Cooling Water Circuit Water Glycol and Chilled Water Units Check circuit for leakage general condition X Check water glycol inlet temperature X Check water regulating valve operation X Check in out water glycol Δt X Check mixture glycol level if applicable X Refrigerating Circuit Check...

Страница 174: ...ation and input power safety switch 600mm 24 models To extract the filters refer to Figure 137 1 Push up the upper filter 2 Pull the bottom of the filter away from the Liebert CRV 3 Pull it out of the unit 4 Lift the lower filter up 5 Pull the bottom of the filter away from the Liebert CRV 6 Pull it out of the unit WARNING Risk of contact with high speed rotating fan blades Can cause serious injur...

Страница 175: ...re 138 Differential pressure switch tubes 600mm 24 models Before restarting the unit be sure that the Liebert CRV s door is properly closed If it is ajar the microswitches on the door will keep the unit in safety status Push the upper filter up pull the bottom away from the Liebert CRV and lift it out of the unit Slide the lower filter up beyond the support bar and lift it out of the Liebert CRV t...

Страница 176: ...Step 3 for the bottom filter 5 Replace the lower filter securing it with the adjustable brackets 6 Replace the upper filter securing it with the adjustable brackets Figure 139 Remove the air filters 300mm 12 models After cleaning or replacing the filter and before reassembling the unit check that the air differential pressure switch tube clogged filter alarm are correctly installed Also verify tha...

Страница 177: ...Maintenance 167 Liebert CRV Figure 140 Differential pressure switch components 300mm 12 DX models Differential Pressure Switch Differential Pressure Sampling Point ...

Страница 178: ...ar clogs in the discharge check valve and float mechanism 5 Reassemble and check for leaks 16 9 Air Cooled Condenser and Drycoolers 1 Clear the coil surface of all debris that might inhibit airflow 2 Check for and correct bent or damaged coil fins 3 Do not permit snow to accumulate around or under an outdoor unit 4 Consider having the coil surface commercially cleaned periodically 5 Inspect fans m...

Страница 179: ...a 7 Remove the four bolts attaching the fan to be replaced to the fan frame assembly 8 Reverse the steps to install the replacement fan Figure 142 Liebert CRV fan assembly components WARNING Risk of electric shock and contact with high speed rotating fans Can cause injury or death Open all local and remote electric power disconnect switches verify that power is off with a voltmeter and verify that...

Страница 180: ...ion EC No 842 2006 the following list specifies the global warming potential GWP of some major F gases R 134A GWP 1300 R 407C GWP 1610 R 410A GWP 1890 Operators of the above mentioned applications which contain fluorinated greenhouse gases shall using all measures that are technically feasible and do not entail disproportionate cost a prevent leakage of these gases and as soon as possible repair a...

Страница 181: ...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 c In general the above mentioned information has been located in the main nameplate of the relevant unit d For equipment with double refrigeration circuits in regards to different requirements based on the quantity of F gas contained the required inf...

Страница 182: ...nt room cooling capacity Reduce rack heat load or add cooling units Chilled water regulating valve issue Contact your local Emerson representative Unit safety device tripped Contact your local Emerson representative Compressor will not load Verify air temperature setpoint and temperature control sensor reading Verify suction pressure in the service menus diagnostic service icon with the compressor...

Страница 183: ...s to heat source Supply chilled water temperature too low Check cooling water temperature Low Room Humidity Humidifier Suspended message See 11 3 5 Humidification Humidifier problem alarm Check fault LED on humidifier PCB enclosure See A 1 6 Humidifier Troubleshooting Room Humidity Problem Room humidity has exceeded the humidity control band for 36 hours straight Verify setpoints and confirm room ...

Страница 184: ...ioning of temperature sensors Unbalanced heat load distribution Redistribute rack heat load Remote temperature sensor s issue Contact your local Emerson representative Faulty temperature sensor s Contact your local Emerson representative Unit controller issue Contact your local Emerson representative Local display is not operational but unit operates Local display cable disconnected Connect cable ...

Страница 185: ...r level is too low indicating too high a concentration and the need to dilute the water in the cylinder If the water reaches the top of the cylinder before 100 FLA the fill valve shuts Off via the sensor and the fill boil fill boil cycle continues cycling Off the red high water sensor light until the concentration becomes high enough to reach 100 FLA The above described control process will then t...

Страница 186: ...truct humidifier plumbing Do not use completely demineralized water with this unit The water must contain minerals for 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 soft copper tubing is provided with the unit and requires n...

Страница 187: ...tput capacity is reached after which the water level will automatically lower itself in the cylinder The increased concentration allows for lower electrode coverage while maintaining the same output When a stabilized condition is reached the water will be boiling close to the cylinder seam level The solid state circuitry will maintain the proper concentration in the cylinder by introducing short d...

Страница 188: ... must be ordered Reverse the procedure to install a new cylinder Figure 145 Sensor pins cylinder plugs Humidifier Maintenance 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 in...

Страница 189: ...d leg is the primary wire to the cylinder that loops through the current sensing device of the main PCB This wire ends at the red cylinder plug at the cylinder Table 42 Humidifier troubleshooting Unit Status Lamp Symptom Corrective Actions Yellow Green On On Maximum water level inside cylinder This usually happens on initial start up after replacing the cylinder normal Water is concentrated with m...

Страница 190: ...reen Figure 146 CANbus and Ethernet cable wiring Straight through Ethernet cable with RJ 45 connectors suitable for U2U connection or for connecton of the Liebert iCOM Large Coldfire Display all through switch or hub Six wire CANbus cable with RJ 12 long body connectors suitable for Liebert iCOM board with THB HCB and Liebert iCOM display connections 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Pair 4 Pair 2 P...

Страница 191: ...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 Wait 30 seconds and if the fill relay points do not touch replace the sensor If they still do not touch the basic PC board may be faulty To confirm disconnect the red wire from terminal 18 and touch it to terminal 14 If the fill valve coil activ...

Страница 192: ...ring liebert monitoring emerson com 800 222 5877 Outside North America 00800 1155 4499 Single Phase UPS Server Cabinets liebert upstech emerson com 800 222 5877 Outside North America 00800 1155 4499 Three Phase UPS Power Systems 800 543 2378 Outside North America 614 841 6598 Environmental Systems 800 543 2778 Outside the United States 614 888 0246 Locations United States 1050 Dearborn Drive P O B...

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