Emerson Liebert ICOM-DO Unit installation

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.com
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
Digit 8 - Fan Type
EC Plug Fans = 1
Digit 9 - Power Supply
A = 460V / 3ph / 60Hz (35kW and 40kW only)
C = 208V / 3ph / 60Hz
Digit 10 - Cooling System
2 =Two-Way Valve (CW Only)
Digit 16 - Unit Color
1 = Standard Color (Z-7021 Black)
2 = Non-Standard Color
Digit 17 - High-Voltage Options
L = No Dual-Float Condensate Pump (for CW units without
humidifier)
5 = Dual-Float Condensate Pump (for CW units with or
without humidifier)
A = No Dual-Float Condensate Pump (for DX units without
humidifier)
E = Dual-Float Condensate Pump (for DX units with or
without humidifier)
Digit 18 - Option Package
0 = None
H = Reheat and Humidifier Lockout
C = Reheat and Humidifier Lockout Additional Alarm
Contact
Digit 19 - Liebert IntelliSlot® Housing
0 = No Cards
1 = One Web Card
3 = Three-Way Valve (CW Only)
2 = Two Web Cards
7 = R-410A Digital Scroll Single Circuit (DX Only)
3 = One 485 Card
Digit 11 - Humidifier
0 = None
S = Steam Generating Canister
Digit 12 - Display Type
D = Liebert iCOM Control with Large Graphic Display
Digit 13 - Reheat
0 = None
1 = Electric Reheat
Digit 14 - Air Filter
8 = Merv 8 + Clogged Filter Alarm
9 = Merv 11 + Clogged Filter Alarm
4 = Two 485 Cards
5 = One Web Card and One 485 Card
Digit 20 - Additional Sensors
0 = None
Digit 21 - Packaging
P = Domestic
S = Export (Seaworthy)
Digit 22 - Special Features
A = No SFAs, Standard Unit
X = SFA Included
Digits 23-25 - Factory Configuration Number
Digit 15 - Water/Glycol Valve Type
1 = Two-Way Valve (W/G only) OR
Default Air-Cooled Selection
7 = Three-Way Valve (W/G only)
H = Default CW Selection
* The 14-digit model number consists of the first 10 digits and last four digits of the Configuration Number.
TABLE OF CONTENTS
1.0
2.0
LIEBERT CRV COMPONENT LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.0
INSPECTION AND UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.1
Equipment Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1
Packing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2
Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3
3.4
3.5
Unpacking the Liebert CRV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Removing the Unit from the Pallet Using Piano Jacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Removing the Piano Jacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.1
Handling the Unit While it is Packaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0
PREPARE THE LIEBERT CRV FOR INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1
Adjust Baffles to Direct Air Properly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0
LIEBERT ICOM CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5.1
5.2
Liebert iCOM Display Readout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Liebert iCOM Remote Rack Sensor Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.1
5.2.2
5.2.3
5.3
Setting the Remote Rack Sensor Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
CAN Bus Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sensor Setup Confirmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Wiring for Unit-to-Unit Communications—U2U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.1
5.3.2
Wiring a Liebert iCOM U2U Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Remote Rack Sensor Operation and Rack View Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.4
5.5
Liebert iCOM Control Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Alarms/Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.0
PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
6.1
Fluid Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.1.1
6.1.2
6.1.3
Condensate Piping—Field-Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Humidifier Supply Water—Optional Steam Generating Canister . . . . . . . . . . . . . . . . . . . . . 27
Requirements of Systems Using Water or Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.0
REFRIGERANT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1
7.2
Piping Guidelines—Air-Cooled Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Refrigerant Piping—Air-Cooled Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2.1
7.2.2
7.2.3
7.3
General layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Pipe Diameter and Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Installing Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Vacuum and Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.3.1
Evacuation Air-Cooled Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
8.0
WATER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.1
8.2
8.3
Water Connections—Supply Humidifier and Drain Water, All Models . . . . . . . . . . . . . . . . 38
Glycol Mixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Water Connections: Water/Glycol-Cooled Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.3.1
8.3.2
Notes for Open-Circuit Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Notes for Closed-Circuit Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
i
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.2
9.3
9.4
Protective Features of the Electrically Commutated Fans . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Protective Features of Electrical Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Temperature Probes Placed on Racks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.0
STARTUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
10.1
10.2
10.3
Initial Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Automatic Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Chilled Water Valve: Chilled Water Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
11.0
12.0
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
CALIBRATION AND REGULATION AFTER STARTUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
12.1
Thermostatic Expansion Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
12.1.1 Determine Suction Superheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
12.1.2 Adjust Superheat Setting with the TEV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
12.2
Environmental Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
13.0
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
13.1
13.2
13.3
13.4
13.5
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspect and Replace the Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condensate Drain and Condensate Pump Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52
52
52
53
54
13.5.1 Condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
13.5.2 Condensate Pump, Dual-Float. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
13.6
13.7
13.8
13.9
Air-Cooled Condenser and Drycoolers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dismantling the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F-Gas Regulation (EC) No. 842/2006 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
54
55
56
56
14.0 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
APPENDIX A - HUMIDIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
A.1
Principal of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
A.1.1
A.1.2
A.1.3
A.1.4
A.1.5
A.1.6
A.2
Humidifier Water Supply and PlumbingHumidifier Water Supply and Plumbing . . . . . . . .
Humidifier Water ConnectionHumidifier Water Connection . . . . . . . . . . . . . . . . . . . . . . . . .
Humidifier Startup and OperationHumidifier Startup and Operation . . . . . . . . . . . . . . . . .
Low Water ConductivityLow Water Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cylinder ReplacementCylinder Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidifier TroubleshootingHumidifier Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . .
59
60
61
61
61
63
Starting Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
APPENDIX B - ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
APPENDIX C - INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
APPENDIX D - REFRIGERANT, HYDRAULIC AND ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . 71
APPENDIX E - ELECTRICAL FIELD CONNECTIONS DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 74
ii
E.1
Standard Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
E.2
Optional Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
APPENDIX F - REFRIGERATION & HYDRAULIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
FIGURES
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
Figure 29
Figure 30
Figure 31
Figure 32
Figure 33
Figure 34
Figure 35
Figure 36
Figure 37
Figure 38
Figure 39
Figure 40
Figure 41
Figure 42
Figure 43
Figure 44
Figure 45
Component location, common components—All models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Component location - Liebert CR035, CR020 air-cooled units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Component location - Liebert CR035, CR020 water/glycol-cooled units . . . . . . . . . . . . . . . . . . . . . 4
Component location - Liebert CR040 chilled water units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Liebert CRV, front and rear views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Liebert CRV center of gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Recommended unit handling equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unpacking the Liebert CRV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Document shipping location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Adjust leveling feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Adjust the baffles to ensure correct airflow direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Liebert CRV system screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Liebert iCOM menu components for Liebert CRV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Remote rack sensor access point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Remote rack sensor termination jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CAN bus and Ethernet cable wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
U2U network setup diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Wiring a large display for U2U network operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Liebert vNSA with optional remote large display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Rack setup screen, page 1 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Rack setup screen, page 2 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Rack setup screen, page 3 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Rack overview screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Setpoint screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Gravity drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Top refrigerant piping connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Bottom refrigerant piping connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Bottom entry connection dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Recommended piping diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Piping and refrigerant sizes for Liebert Lee-temp condensers with R-410A. . . . . . . . . . . . . . . . . 34
Piping and refrigerant sizes for Liebert air-cooled, VFD control condensers with R-410A . . . . . 34
Connections for vacuum creation and refrigerant charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Top connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Water connection points, bottom entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Chilled water connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Chilled water circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Bottom entry dimensions—piping and electrical openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Recommended drycooler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Remove electrical panel and lower front panel] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Power and control cable entry points and routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Electrical heating with temperature sensor protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Temperature sensor placement, cabling and chain configuration . . . . . . . . . . . . . . . . . . . . . . . . . 46
Refrigerant line components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Position of the chilled water valve actuator (for 2- or 3-way valve) . . . . . . . . . . . . . . . . . . . . . . . 49
Sensor location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
iii
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condensate pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General diagram—humidifier operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water connection to humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor pins, cylinder plugs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pipeline air conditioner - condenser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overall dimensions / service area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Raised-floor cutouts for piping and electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air bleeding valve position CW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical connections - entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connections—air-cooled models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connections—water/glycol models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connections—chilled water models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical field connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General arrangement—air-cooled units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General arrangement—water-glycol units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General arrangement—chilled water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
53
54
54
59
60
62
67
68
69
70
70
71
72
73
75
76
77
78
TABLES
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
Table 12
Table 13
Table 14
Table 15
Table 16
Table 17
Table 18
Table 19
Table 20
Table 21
Table 22
Table 23
Table 24
Center of gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Weights without packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Shipping weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Keyboard icons and functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Sensor address configuration settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Ports available for connecting Liebert iCOM control devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Controlling sensor settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Condenser positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Liebert CRV position relative to the remote condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Water connection options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Glycol mixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Maintenance schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Unit diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Humidifier troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Liebert CRV electrical data - 60Hz (Amps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Calibrations of electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Air-cooled condenser refrigerant charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Refrigerant and oil charge for water-cooled models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
R-410A refrigerant and oil charge for air-cooled models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Refrigerant charge 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Dry weight, all model types, ± 5% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Unit connections, air-cooled models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Unit connections, water/glycol-cooled models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Unit connections, chilled water models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
iv
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.
Adhere to all warnings, cautions and installation, operating and safety instructions on the unit and in
this manual. Follow all operating and user instructions.
Any operation that requires opening doors or equipment panels must be carried out only by properly
trained and qualified personnel.
Each machine is equipped with an electric insulation device that allows the operator to work safely.
Switch Off the machine with this electric insulation device before beginning any maintenance operation to eliminate remaining risks (electric shocks, burns, automatic restarting, moving parts and
remote control).
The panel key supplied with the unit must be kept by the person responsible for maintenance. To
identify the unit by model and serial 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
Risk of electric shock, high temperatures, extreme cold and high speed rotating parts. Can
cause equipment damage, injury and death.
Disconnect all local and remote electrical power supplies and allow the component
temperatures to become safe for human contact before removing protective covers and
working within.
If the doors are opened immediately after the Liebert CRV has been switched Off
• some components, such as electrical heaters, compressor, outlet area and outlet piping, may
remain at high temperature about 212°F (100°C);
• some components, such as the evaporator, may remain at low temperature;
• rotating elements, such as the fan impellers, 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.
1
! 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.
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 high voltage.
The only way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch. Refer to the unit electrical schematic.
Follow all local codes.
! WARNING
Risk of refrigerant system rupture or explosion from overpressurization. Can cause
equipment damage, injury and death.
If a pressure relief device is not provided with the condenser unit, the system installer must
provide and install a discharge pressure relief valve rated for a maximum of 609psig (42bar)
in the high-side refrigerant circuit. Do not install a shutoff valve between the compressor and
the field-installed relief valve.
One or more additional pressure relief valves are required downstream of any and all
field-installed isolation. Do not isolate any refrigerant circuits from overpressurization
protection.
2
Liebert CRV Component Location
1.0
LIEBERT CRV COMPONENT LOCATION
Figure 1
Component location, common components—All models
7
13
2
1
9
11
1
14
8
5
6
3
8
12
10
Rear
Front
Liebert iCOM control display
2
Electric box
3
Evaporator / CW coil
4
Condensate pump
5
Electric heaters
6
Humidifier distributor
7
Top humidifier supply,
condensate pump drain
8
Drain trays, two places
9
EC plug fans
10
Bottom electrical entrance
11
Serial tag inside door
12
Bottom condensate pump drain
13
Top electrical entrance
14
Supply air temperature sensor
location (sensor not shown)
4
Figure 2
Component location - Liebert CR035, CR020 air-cooled units
9
7
12
5
6
Front
4
3
8
13
1
11
Rear
2
10
3
1
Thermostatic expansion valve
2
Solenoid valve
3
Sight glass
4
Filter dryer
7
Humidity/Temp. sensor
8
Humidifier
9
Top refrigerant connections
10
Bottom refrigerant connections
11
Bottom humidifier supply
12
Air filters
13
Bottom drain
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. 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 functions and data communication. The Liebert
CRV is optimized for maximum cooling capacity in a minimal footprint.
Figure 5
Liebert CRV, front and rear views
Front
Rear
5
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.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should attempt to move, lift or remove packaging from the Liebert CRV or
prepare the unit for installation.
NOTICE
Risk of overhead interference. Can cause unit and/or structural damage.
The unit may be too tall to fit through a doorway while on the pallet. Measure the unit and
doorway heights and refer to the installation plans prior to moving the unit to verify
clearances.
NOTICE
Risk of unit damage if improperly stored.
Keep the unit upright, indoors and protected from dampness, freezing temperatures and
contact damage.
3.1
Equipment Inspection
After the Liebert CRV unit arrives and before it is unpacked, verify that the delivered equipment
matches the bill of lading. Examine the packaging for any signs of mishandling or damage. Inspect all
items for damage, visible or concealed. Report any damage immediately to the carrier and file a damage claim. Send a copy 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.
3.2
Handling
Figure 6
Liebert CRV center of gravity
Z
X
Y
6
R
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.
• When moving the packaged unit, do not lift it any higher than 6" (152 mm) off the ground. Exercise great care if the unit must be lifted higher than 6" (152 mm); any personnel not directly
involved in lifting the unit must be at least 20ft (5m) away from the unit.
• Be aware of the center of gravity indicated on the package and in Table 1 below:
Table 1
Center of gravity
Distance from lower right front corner, ± 2" (51m)
Model no.
X
Y
Z
CR020
0.52 (20)
0.30 (12)
0.71 (28)
CR035
0.50 (20)
0.30 (12)
0.80 (32)
CR040
0.54 (21)
0.30 (12)
0.80 (32)
The center of gravity on the Liebert CRV varies with the options and the model's size.
Table 2
Model
No.
CR020
CR035
CR040
Table 3
Weights without packaging
Weight ± 5%, lb (kg)
Electrical
Data
Air-Cooled
Water/Glycol-Cooled
Chilled Water
460/3/60
739 (335)
772 (350)
—
208/3/60
739 (335)
772 (350)
—
460/3/60
805 (365)
849 (385)
—
208/3/60
805 (365)
849 (385)
—
460/3/60
—
—
728 (330)
208/3/60
—
—
728 (330)
Shipping weights
Domestic Packaging
Export Packaging
Model
No.
Air
Water/Glycol
Chilled Water
Air
Water/Glycol
Chilled Water
CR020
846
879
—
953
986
—
CR035
912
956
—
1019
1063
—
CR040
—
—
835
—
—
942
7
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. Make sure the fork length is suitable for the unit length.
• When moving the packaged unit with a forklift or pallet jack, lift the unit from either end of the
pallet.
• When handling the packaged Liebert CRV with a forklift or pallet jack, do not lift it any higher
than 2" to 4" (51mm to 102mm) off the ground. Any personnel not directly involved in lifting the
unit must be at least 12 ft (3.7m) from the unit.
• Exercise great care if the unit must be lifted higher than 4" (102mm); any personnel not directly
involved in lifting the unit must be at least 20 ft (5 m) away from the unit.
3.3
Unpacking the Liebert CRV
1. Remove the exterior stretch wrap packaging material from the unit, exposing the protective
corner and side packaging planks.
2. Remove the corner and side packaging planks from the unit, exposing the bag over the unit. The
bag may remain in place for dust and panel protection, or removed for immediate unit
installation.
3. Remove the bag when ready to install the unit.
Figure 8
Unpacking the Liebert CRV
Step 1
Step 2
8
Step 3
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. Set the baffle panel assembly aside in a safe
location until instructed to reattach it.
6. Close and latch the top panel door.
7. Acquire a set of piano jacks rated to properly
handle the unit weight and size.
8. Raise the forks of the piano jacks to contact the
bottom of the unit base.
9. Place the piano jacks against the unit. Place
nonabrasive, protective material between the
piano jacks and the unit panels.
10. Secure the piano jacks to the unit.
11. Use the piano jacks to raise the unit so the
pallet is just off the ground.
12. Use a Phillips screwdriver to remove the 12
wood screws, six from each side of the pallet.
13. Remove the two runner add-on parts.
14. Use the piano jacks to lower the unit so the
pallet rests firmly on the ground.
15. Bolts used to secure the unit to the pallet are
now accessible.
16. Bolts are recessed into the deck boards of the
pallet.
17. Remove the four bolts, two on each side of the
pallet. The bolts can be removed using a 1/2"
socket wrench, open-end wrench or pliers.
18. Remove the three lag bolts from one side of the
remaining pallet deck boards. The lag bolts can
be removed using a 1/2" socket wrench, openend wrench or pliers.
19. Remove pallet parts, including wooden spacer
boards, from under the unit.
20. The unit is now supported only by the piano
jacks.
21. Take the wooden spacer boards, removed in
Step 19, and place them on the ground under
the unit base.
22. Using the piano jacks, slowly lower the unit
until the forks of the piano jacks touch the
ground and the unit base rests on the spacer
boards.
23. The unit is ready to have the piano jacks removed.
9
Steps 1 - 2
Steps 3 - 6
Steps 7 - 10
Steps 11 - 14
Steps 15 - 17
Steps 18 - 19
Steps 20 - 22
Step 23
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. Fit the tool into openings in the ends of the base.
Turn the stabilizer feet one to two additional turns, removing the unit weight from the wooden
spacer boards.
Remove the wooden spacer boards from under the unit.
Using the stabilizer feet, slowly lower the unit until the unit casters are on the ground.
Open the top panel door with the mounted control.
Locate the bottom baffle panel assembly and reattach it to the unit with screws using a standard
screwdriver.
Close and latch the top panel door.
Two or more trained personnel can roll the unit on its casters to the installation site.
Steps 9 - 11
Steps 1 - 3
Step 12
REMOVE
JAM NUT
Steps 4 - 8
10
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. After the Liebert CRV is in its final installation position, adjust the four base supports, or feet,
with an adjustable wrench. Ensure that the unit is level 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, inside the Liebert CRV, to lock the feet.
Figure 10 Adjust leveling feet
Tighten this nut after
the foot is adjusted to
the desired height
Adjust the
height of the
feet
11
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.
Adjust the front panel baffles before startup to ensure the cooling air is directed upward and either
right or left as required. Proper direction helps obtain the maximum cooling efficiency from the Liebert CRV unit and to prevent racks from overheating.
The Liebert CRV is shipped with the baffles in an alternating pattern. This configuration is intended
for Liebert CRVs that are installed in the row, between racks, distributing cold air left and right.
The baffles in Liebert CRVs installed at the end of a row should be adjusted to direct the cold supply
air toward the server racks.
Baffle segments nearer the top of the unit will supply more cooling air than segments near the bottom. Supply air travels slightly farther when all segments are pointed in the same direction.
To adjust the baffles:
1.
2.
3.
4.
Open the door containing the Liebert iCOM display.
Remove the two screws holding a baffle panel segment in place.
Lift out the baffle segment.
There is one screw on each side of the baffle, as shown in Figure 11. Remove the screws and
rotate the baffle segment around its horizontal axis to change the airflow direction.
5. Reinsert the baffle segment and reinstall the screws.
Figure 11
Adjust the baffles to ensure correct airflow direction
2. Remove two bolts
1. Open Liebert
CRV Display Door
Inside view, showing
baffle removal for changing
airflow direction
3. Tilt and lift
baffle panel
12
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.
5.1
Liebert iCOM Display Readout
The Liebert iCOM controller for the Liebert CRV supports multiple main screen layouts. The screens
are a graphical representation of the Liebert CRV, selectable to show unit operation with or without
rack sensors, unit operation with a rack sensor summary, historical temperature and humidity trending or trending the screens used on other Liebert products. Unlike other Liebert cooling products, the
Liebert CRV display will always revert to the Unit Screen instead of the System Screen.
Figure 12 Liebert CRV system screen
The System screen can be accessed by pressing the Up arrow key when the Unit screen is displayed.
The System screen shows the fan speed and cooling capacity averages of all connected units. The Supply, Return and Remote Rack sensors of all connected units are also displayed showing the average,
maximum and minimum of all connected sensors.
13
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.
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.
Blinking Red—Active, unacknowledged alarm exists
Upper LED
Solid Red—Active, acknowledged alarm exists
Amber—Power is available to the unit; unit is NOT operating
Lower LED
Green—Unit is operating with no alarms
5.2
Liebert iCOM Remote Rack Sensor Configuration
There are two steps to setting up a remote rack sensor:
• The DIP switches of the remote rack sensor must be configured to have a unique ID
• The Liebert iCOM must be used to set the remote rack sensor as either a controlling sensor or as
a reference sensor.
15
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.
Table 5
Sensor address configuration settings
CAN Node
Address
SW1-1
SW1-2
SW1-3
SW1-4
SW1-5
SW1-6
Comment
20
Off
Off
ON
Off
ON
Off
21
ON
Off
ON
Off
ON
Off
Rack Sensor 2
22
Off
ON
ON
Off
ON
Off
Rack Sensor 3
23
ON
ON
ON
Off
ON
Off
Rack Sensor 4
24
Off
Off
Off
ON
ON
Off
Rack Sensor 5
25
ON
Off
Off
ON
ON
Off
Rack Sensor 6
26
Off
ON
Off
ON
ON
Off
Rack Sensor 7
27
ON
ON
Off
ON
ON
Off
Rack Sensor 8
28
Off
Off
ON
ON
ON
Off
Rack Sensor 9
30
Off
ON
ON
ON
ON
Off
Rack Sensor 10
Rack sensor 1
Figure 14 Remote rack sensor access point
DIP Switch
Access Hole
5.2.2
CAN Bus Termination
The last or end sensor of the sensor network requires a jumper on the circuit board moved for proper
termination of the sensor network. This termination helps to reduce noise and reflections on the sensor network. The sensor at the physical end of the network is the sensor with only one cable plugged
into it.
To correctly position the termination jumper:
1.
2.
3.
4.
Unplug all connections to the sensor.
Remove the three screws holding the sensor housing together.
Locate the P3 jumper directly above the left network connection port.
Change the jumper selection from Pins 1 and 2 to Pins 2 and 3 (see Figure 15).
16
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.
Located in the Service / Rack Setup Menu of the Liebert iCOM display, the sensors can be set up to
either display or control temperature, give them a rack name and draw a rack layout that can be
viewed in the User menu.
Figure 16 CAN bus and Ethernet cable wiring
17
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. If network communication is ever lost (failed network switch, etc.), all Liebert iCOM-controlled cooling units will continue to
operate as independent units.
The Liebert iCOM control can support up to 64 nodes on one network. An input/output board, large
display, and large wall-mount display are each considered one node. Of the 64 nodes that may be connected, no more than 32 may be input/output boards (32 cooling units).
Network communication can be configured during system startup by a Liebert-trained technician. For
technical issues contact:
Liebert Technical Service
1050 Dearborn Drive
Columbus, Ohio 43235
Telephone: 1-800-LIEBSRV (1-800-543-2778)
E-Mail: technicalservice@emersonnetworkpower.com
5.3.1
Wiring a Liebert iCOM U2U Network
A network switch is required to enable Ethernet unit-to-unit communication on one or more cooling
units with large displays. Each cooling unit with a large display requires two straight-through Ethernet cables from a network switch. One cable connects to port P64 on the Liebert iCOM input/output
board and the other straight-through cable connects to the P64 port on the back of the large display
(see Figure 18).
18
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: 192.168.254.001
U2U Address: 1
Group #: 1
IP Address: 192.168.254.002
U2U Address: 2
Group #: 1
Liebert Cooling Unit
with Large Liebert
iCOM Display
Liebert Cooling Unit
with Large Liebert
iCOM Display
Network
Switch
Display Service/Network
Liebert iCom Display Menu
IP Address: 192.168.254.035
U2U Address: 35
Group #: 1
---------------------------------------
Display Service/Network
Liebert Cooling Unit
Control Board Menu
Liebert Cooling Unit
with Large Liebert
iCOM Display
IP Address: 192.168.254.003
U2U Address: 3
Group #: 1
Wall-Mount Large Display
Only large displays can be used for remotely monitoring and controlling cooling units connected on
the same network. Each wall-mount large display requires 120V input power; Liebert provides an AC
adapter wall plug. A straight-through Ethernet 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.
19
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. An optional remote large display can be
attached to the front door as well. All models have a power supply that requires connection to a single
phase 120V or 240VAC power source. The enclosure features a key lock for security.
The Liebert vNSA supports autonegotiation, autopolarity and autocrossing, allowing for the use of
standard network cables for connection to each port, rather than special crossover cables. The switch
detects and makes adjustments for the network's speed and transmission mode, polarity and transmit-and-receive pins. See the Liebert vNSA user manual, SL-18840, for more details.
The number of ports available for connecting Liebert iCOM control devices varies by model as shown
in Table 6. Models with a remote large display attached to the front door utilize one of the available
Ethernet ports in the Liebert vNSA. Models with two switches utilize two ports to connect the
switches.
20
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 remote large display
3.298"
(84mm)
12"
(305mm)
14.25"
(362mm)
DPN001136
Rev. 0
21
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.
Figure 21 Rack setup screen, page 2 of 3
Once a sensor has been assigned to either control or display its temperature data a virtual position
can then be assigned to the sensor. This screen configures the Rack View layout in the User menu.
This step is not required for the sensor to operate but does provide a logical position in the row for
quickly referencing affected racks near the Liebert CRV. To set up navigate using the arrow and enter
keys to highlight the Assign Sensors 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. The Up and Down arrow keys can
be used to select the sensor node number. For the Liebert CRV select “CRV.”
22
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. The Up and Down arrow keys can be used to select any alpha or numeric
value up to four positions.
Figure 23 Rack overview screen
If the Rack Setup menus are configured in the Service menu to locate and label the remote rack sensors, then the Rack View in the User menu should look similar to the screen above. This screen will
show the node number at the top of each block, the label and the actual temperature that each sensor
is currently measuring.
23
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.” This means that the fan speed can now be controlled independently of the cooling capacity. In
this advanced configuration, the Liebert CRV can control the discharge temperature of the unit by
modulating cooling capacity based on the supply sensor and use the remote rack sensors to ensure
that the cool air is being delivered to the inlet of the racks. Using the supply and remote rack sensors
in this de-coupled 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 in Table 7.
Figure 24 Setpoint screen
In Figure 24, the controlling sensor can be selected for the different types of sensor control modes. As
the selection is changed from one sensor to another, the setpoint value moves to the appropriate sensor position, giving a visual indication of the sensor placement in relationship to the Liebert CRV.
Table 7
Controlling sensor settings
Cooling Control
S103Cool / S125 Fan
Fan Control
Supply
Remote Sensor
Return
Supply
Factory Default
(Coupled)
N/A
N/A
Remote Sensor
Recommended
(Decoupled)
X
(Coupled)
N/A
X
(Decoupled)
X
(Decoupled)
X
(Coupled)
Return
Table 7 shows the flexibility of the Liebert CRV and how the different sensor configurations can be
used to control the Liebert CRV fan speed and cooling capacity. The table shows the different coupled
and decoupled modes available for the Liebert CRV.
24
Liebert iCOM Control
5.5
Alarms/Events
The following alarms and events are supported by the Liebert iCOM control on the Liebert CRV.
Unit On / Off
Unit Hours Exceeded
Humidifier Low Amps
Standby Mode
BMS Disconnected
Comp 1 Short Cycle
Power On
Room Humidity Problem
Humidifier High Amps
Power Off
Bottom Fan Failure
Humidifier Low Water
Loss of Power
Rack Sensor Failure
System Off Requested
Unit Disconnected
Low Return Humidity
System Off Confirmed
High Return Temperature
High Return Humidity
Fire Alarm
Low temperature
Low Supply Temperature
Heaters Overheated
High Chill Water Temperature
High Supply Temperature
Condenser 1 Failure
Loss of Airflow
Top Fan Failure
Humidifier Cylinder Worn
Loss of Chill Water Flow
Reheat Lockout
Maintenance Done
Clogged Filters
Heat Rej VFD
Maintenance Should Be Done!
Low Pressure Transducer Failure
Humidifier Lockout
Top Fan Failure
Supply Sensor Failure
Heat Rej TVSS
Control Valve Failure
Room Sensor Failure
Compressor(s) Lockout
Fluid Sensor Failure
25
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.
Refer to specific text and detailed diagrams in this manual for other unit-specific piping requirements.
All piping below the elevated floor must be arranged so that it offers the least resistance to airflow.
Careful planning of the piping 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.
6.1
Fluid Connections
NOTICE
Risk of water leakage. Can cause severe property damage and loss of critical data center
equipment.
This unit requires a water drain connection. It may require an external water supply to
operate the humidifier. Improper installation, application and service practices can result in
water leakage from the unit.
Do not locate the Liebert CRV directly above any equipment that could sustain water damage.
Emerson recommends installing leak detection equipment for the unit and supply lines.
6.1.1
Condensate Piping—Field-Installed
•
•
•
•
•
Do not reduce drain lines
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 under-floor leak detection equipment
Gravity Drain—Units Without Factory-Installed Condensate Pump
• 3/4" FPT drain connection is provided on units without optional factory-installed condensate
pump with infrared humidifier or no humidifier; 1-1/4" FPT connection is provided on units with
steam generating humidifier
• Pitch the drain line toward the drain 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
NOTICE
Risk of improper piping connections. Can cause damage to the equipment and to the building.
The drain line must not be trapped outside the unit or water may back up in the drain pan.
26
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. 0
Condensate Pump
• 1/2" copper sweat connection is provided on units with optional factory-installed condensate
pump
• Condensate pump is rated for approximately 400 gph at 10 feet total head
• Size piping based on available condensate head
6.1.2
Humidifier Supply Water—Optional Steam Generating Canister
•
•
•
•
•
6.1.3
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 water source
Water conductivity must be in the range of 330-670 micro-siemens
Requirements of Systems Using Water or Glycol
These guidelines apply to the field leak checking and fluid requirements for field piping systems, including Liebert chilled water, condenser (water or glycol) and drycooler circuits.
27
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.
• Install manual shutoff valves at the supply and return line to each indoor unit and drycooler to
permit routine service and emergency isolation of the unit.
NOTICE
Risk of frozen fluids. Can cause equipment damage and building damage.
Freezing system fluids can rupture piping. Complete system drain-down cannot be ensured.
When the field piping or unit may be exposed to freezing temperatures, charge the system
with the proper percentage of glycol and water for the coldest design ambient.
Automotive antifreeze is unacceptable and must NOT be used in any glycol fluid system.
NOTICE
Risk of corrosion. Can cause equipment damage.
Read and follow 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.
Contact a local water consultant regarding water quality, corrosion and freeze protection
requirements.
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 from some sources may
contain corrosive elements that reduce the effectiveness of the inhibited formulation.
Preferably, surface waters that are classified as soft and are low in chloride and sulfate ion
content should be employed. Proper inhibitor maintenance must be performed in order to
prevent corrosion of the system. Consult glycol manufacturer for testing and maintenance of
inhibitors.
Commercial ethylene glycol (Union Carbide Ucartherm, Dow Chemical Dowtherm SR-1 and
Texaco E.G. Heat Transfer Fluid 100), when pure, is generally less corrosive to the common
metals of construction than water itself. It will, however, assume the corrosivity of the water
from which it is prepared and may become increasingly corrosive with use if not properly
inhibited.
NOTICE
Risk of oxide layer formation. Can cause equipment damage.
Idle fluid allows the collection of sediment that prevents the formation of a protective oxide
layer on the inside of tubes. Keep unit switched ON and system pump operating.
Leak Checking of Unit and Field Piping
Liebert unit fluid systems are factory-checked for leaks and may be shipped with a nitrogen holding
charge. Liebert unit fluid circuits should be checked for leaks at installation as described below.
NOTE
During leak checking of field-installed piping, Emerson 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 sensing a
tracer gas with suitable instrumentation. Dry seals in fluid valves and pumps may not hold a
high gas pressure.
28
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.
If a pressure relief device is not provided with the condenser unit, the system installer must
provide and install a discharge pressure relief valve rated for a maximum of 609psig (42bar)
in the high side refrigerant circuit. Do not install a shutoff valve between the compressor and
the field installed relief valve.
One or more additional pressure relief valves are required downstream of all field-installed
isolation valves. Do not isolate any refrigerant circuits from overpressurization protection.
NOTICE
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. Because water is the enemy of a reliable refrigeration system,
extreme care must be used when opening systems during installation or service. If water is
absorbed into the POE oil, it will not be easily removed and will not be removed through the
normal evacuation process. If the oil is too wet, it may require an oil change. POE oils also
have a property that makes them act as a solvent in a refrigeration system. Maintaining
system cleanliness is extremely important because the oil will tend to bring any foreign
matter back to the compressor.
The Liebert CRV can be connected to a condenser through either the top or bottom of the unit. The
unit is piped for connections at the top of the unit as shown in Figure 26, with provision for connection through the bottom of the unit.
Connecting through the bottom of the unit requires cutting the liquid and suction lines as shown in
Figure 27. 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.
7.1
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 and condenser
• Use copper piping with high temperature brazed joints
• Isolate piping from building using vibration-isolating supports
• Refer to Figures 30 and 31 for piping sizes
• Refer to condenser installation manual for charging information
• Install traps on hot gas (discharge) lines at the base of vertical risers and every 15 feet (4.6m) of
vertical rise.
• See Table 9 for the allowable elevation difference between the condenser and the Liebert CRV.
• Consult factory if piping run exceeds 150 feet (46m) equivalent length
• Keep piping clean and dry, especially on units with R-410A refrigerant
• Avoid piping runs through noise-sensitive areas
• Do not run piping directly in front of airstream of any air conditioner
• Refrigerant oil – do not mix oil types
Refer to ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping.
29
Refrigerant Connections
7.2
Refrigerant Piping—Air-Cooled Models
Figure 26 Top refrigerant piping connections
Figure 27 Bottom refrigerant piping connections
If using bottom
connections, cut
the pipes just
below the black
pipe clamps
30
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"
(544.5mm)
2-3/16"
(55mm)
FRONT
31
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.
Use the shortest possible refrigeration pipelines to minimize the total charge of refrigerant and
the number of pressure drops.
Minimize the number of bends and make the bends the largest radius practical to prevent
constricting refrigerant flow.
Insulate the piping as specified in Table 8. If the pipes are installed next to electrical cables, they
must be from isolated from the building using vibration-isolating supports to avoid damage to
cable insulation.
There must be at least one inch (25mm) separation between the gas and liquid pipelines. If this is
not possible, insulate both lines.
Support both horizontal and vertical pipes with vibration-damping clamps, which include rubber
gaskets. Place these clamps every 5 to 7 ft. (1.5 to 2m).
32
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
Room Unit
(See **)
Liquid
Condenser Above
Liebert CRV
Gas
Condenser
Position
Gas
Liquid
(*) Oil traps every 20ft. (6m)
of vertical piping
**See Table 9
Table 9
Liebert CRV position relative to the remote condenser
Parameter
Maximum Distances, ft. (m)
From Liebert CRV to condenser
150 (46) equivalent length
From Liebert CRV to VFD condenser
Above: 60 (18.3)
Below: 15 (4.5)
From Liebert CRV to Liebert Lee-Temp condenser
Above: 60 (18.3)
Below: 0 (0)
Requirements
Oil traps on vertical line of gas refrigerant
Every 15 (4.6)
33
(See**)
Liquid
(See **)
20ft. (6m)
Layout
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.
Figure 30 Piping and refrigerant sizes for Liebert Lee-temp condensers with R-410A
Figure 31 Piping and refrigerant sizes for Liebert air-cooled, VFD control condensers with R-410A
34
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. Because water is the enemy of a reliable refrigeration system,
extreme care must be used when opening systems during installation or service. If water is
absorbed into the POE oil, it will not be easily removed and will not be removed through the
normal evacuation process. If the oil is too wet, it may require an oil change. POE oils also
have a property that makes them act as a solvent in a refrigeration system. Maintaining
system cleanliness is extremely important because the oil will tend to bring any foreign
matter back to the compressor.
When installing the refrigerant piping, note the following:
Brazing:
• All joints must be brazed.
• Avoid butt brazes by using couplings or swaging one of the pipes with a swaging tool.
• Ensure that all brazed joints are leak-free.
• Flow dry nitrogen through the pipes during brazing.
Always 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.
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 of refrigerant flow. (See labels on refrigerant.)
Wash out the pipelines as follows:
a. Plug up the free ends of the pipes.
b. Connect a helium or nitrogen cylinder, fitted with a reducer (max. pressure 10 bar), to the 1/4"
SAE Schrader valve of the condenser.
c. Pressurize the pipes with helium or nitrogen.
d. Unplug the pipes instantaneously.
e. Repeat Steps a through d several times.
This operation is especially important when hard copper piping is used.
Open all the shutoff valves on the room unit.
Discharge the room unit pressurized with helium (at 1 bar) by opening the charge valves so that
all the branches of the circuit are discharged (e.g., on the receiver, on the low pressure side and on
the compressor delivery).
Debraze the bottoms from the connections of the room unit.
Fix (braze) the pipes to the connections on the air conditioner.
Connect the refrigerant safety valve to the outdoors with a 16 mm (5/8") copper pipe.
35
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
7.3.1
Evacuation Air-Cooled Models
Variable Fan Speed Control Leak Check and Evacuation Procedure
Proper leak check and evacuation can be accomplished only with all system solenoid valves open and
check valves accounted for.
NOTE
The system include a factory-installed check valve and an additional downstream Schrader
valve with core in the compressor discharge line. Proper evacuation of the condenser side of the
compressor can be accomplished only using the downstream Schrader valve. See piping
schematic.
1. If unit power is available, open the unit liquid line solenoid valves using the evacuation function
for System #1 in the diagnostic section of the Liebert iCOM control (refer to the Liebert iCOM
user manual, SL-18835). If unit power is not available, a field-supplied 24VAC / 75VA power
source must be directly connected to the unit solenoid valve.
2. Connect refrigerant gauges to the suction rotalock valves and discharge line Schrader valves.
3. Open the service valves and place a 150 PSIG (1034 kPa) of dry nitrogen with a tracer of
refrigerant. Check system for leaks with a suitable leak detector.
4. After completion of leak testing, release the test pressure (per local 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 250 microns or less. Recheck the pressure after
two hours. After completing this step, proceed to Variable Fan Speed Charging on page 37.
36
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.
NOTICE
Risk of improper refrigerant charging. Can cause equipment damage.
Refrigerant R-410A is a blend of two components 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 suction service valve. Care must be exercised to avoid
damage to the compressor. Emerson recommends connecting a sight 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 Liebert iCOM user manual, SL-18835).
The charging function operates the compressor at full capacity and energizes the blower motor
and the liquid line solenoid valve. The reheat and humidifier are disabled. A minimum 20psig
(138kPa) must be established and maintained for the compressor to operate. The charging
function can be reset as many times as required to complete unit charging.
6. Charge the unit until the liquid line sight glass becomes clear, then add one additional pound
(2.2kg) of refrigerant.
NOTE
A digital scroll compressor will have a clear sight glass only when operating at 100% capacity.
When operating below 100%, the sight glass may show bubbles with each 15-second unloading
cycle.
7. 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—fan starts to rotate at 310psig
(2137kPa) and is full speed at 400psig (2758kPa).
37
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
8.1
Water Connections—Supply Humidifier and Drain Water, All Models
Units with a condensate pump and humidifier are preset to be connected from the top. If floor connections are used, the water lines can be intercepted at the following points:
Figure 34 Water connection points, bottom entry
Condensate Pump Drain
Humidifier Water Supply
38
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.
8.2
Glycol Mixture
Add ethylene glycol or propylene glycol to the circuit in the percentages shown in Table 11.
Table 11
8.3
Glycol mixtures
Glycol Percentage
of Total Mixture
Ethylene Glycol Freezing Temperature °F (°C)
Propylene Glycol Freezing Temperature °F (°C)
0%
32 (0)
32 (0)
10%
23 (-5)
27 (-3)
20%
12 (-11)
19 (-7)
30%
0 (-18)
8 (-14)
40%
-17 (-27)
n/a
Water Connections: Water/Glycol-Cooled Models
The unit must receive cooling water as follows:
• From an external cooling water source, in open circuit.
• Using a drycooler, in closed circuit.
1. Connect the piping as shown in Appendix D - - Refrigerant, Hydraulic and Electrical
Connections.
2. Use hoses connected with three-piece joints to the condenser water inlet and outlet couplings.
3. Install a 16-20 mesh strainer on the chilled water supply to the Liebert CRV. The strainer is
needed to prevent particles in the chilled water from entering the unit’s heat exchanger.
4. Place shutoff ball valves at the conditioner inlet and outlet to allow easy maintenance.
5. Install a water drain system at the lowest point in the circuit.
6. Fully drain the piping before connecting it to the air conditioner.
8.3.1
Notes for Open-Circuit Applications
• Use the unit with mains or well water. Do not use water from an evaporative cooling tower unless
the water hardness is controlled.
• The water pressure must be 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.
8.3.2
Notes for Closed-Circuit Applications
The installation in Figure 3 is illustrative only; for individual installations follow the project diagram.
• Install a pump system calculated on the basis of the flow and total head of the system (see site
plan data) and controlled by the compressor running (see label on the Liebert CRV).
• Insulate both pipes.
• Very important: Add water and ethylene glycol to the circuit when the ambient temperature is
below 32°F (0°C); refer to the Liebert CRV technical data manual, SL-11978). Do not exceed the
nominal operating pressure of the circuit components.
• Bleed air out of the circuit.
39
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.
Install a water drain tap at the lowest point in the circuit.
Fill the circuit with water/glycol.
Figure 36 Chilled water circuit
Pressure
Gauge
Liebert CRV
Insulation Thermostat
Tubing Support
Water Drain Tap
40
Ball
Valves
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"
(544.5mm)
2-3/16"
(55mm)
FRONT
Figure 38 Recommended drycooler Installation
Filling
Water
TS
Disconnect
After Charge
Standby Pump
(optional)
Standby Pump
Shutoff Valve
Pump
TS Thermostat (*)
HTC Variex (Opt.)
Check Valve
Safety Valve
Manometer
Expansion Tank
Pressure-Operated Bypass
HTC
Air Separator
Charge Group (Filter,
Reducer, Check Valve)
Filling Meter
Drain (at Lowest Point)
See hydraulic drawings in the Appendix D
41
APPLIANCE
Electrical Connections
9.0
ELECTRICAL CONNECTIONS
9.1
Electrical connections
Figure 39 Remove electrical panel and lower front panel]
Remove these screws
to open the electrical
panel and the lower
front panel
Figure 40 Power and control cable entry points and routing
Routing cables from the top
Low voltage
signal entry port
Power supply
entry port
Plastic Clamps
for Cable Ties
Routing cables from bottom
entry points
Use cable ties to connect
cables to plastic clamps
Before proceeding with the electrical connections, ensure that:
• all electrical components are undamaged
• all terminal screws are tight
• the supply voltage and frequency are as indicated on the unit
42
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.
• The General Alarm terminals allow remote alarm signalling.
In case of short circuit, check the affected switch for sticking and replace it if necessary.
See electrical data in Appendix B - Electrical Data.
9.2
Protective Features of the Electrically Commutated Fans
The EC fans are protected against:
•
•
•
•
Overtemperature of electronics
Overtemperature of motor
Locked rotor protection
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 (typical value) for 5 seconds or longer, the motor is
switched Off, electronically, with no potential for separation, and the status relay is released.
When the utility voltage returns to a correct value, the motor restarts automatically.
• Phase failure recognition:
If one phase fails for 5 seconds or longer, the motor is switched Off, electronically, with no potential for separation, and the status relay is released.
When all three phases return to correct values, the motor restarts automatically in 10 to 40 seconds.
The power supply for an external speed-setting potentiometer is protected against short-circuiting.
The motor is overload-protected via motor current limitation.
43
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).
9.4
Temperature Probes Placed on Racks
The 2T rack temperature sensors provide feedback to the cooling unit about the condition of the air
entering the server racks. This information allows the Liebert CRV to ensure it is providing just
enough cold air to each rack, virtually eliminating hot spots. Overcooling and excessive airflow are
avoided, greatly reducing 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 iCOM control network, all
sensor data is shared to optimize their performance as a system.
While 2T rack sensor installation is not required, it is HIGHLY recommended. Each 2T sensor consists of two temperature probes for redundancy to be attached to the front door of the server racks.
The sensor probes should be located at the highest part of the rack door while still in the supply airflow path of the servers.
A sensor network can be extended at any time by connecting additional 2T sensors to the last 2T sensor on the network. Sensors connect in a daisy chain fashion back to the cooling unit; individual wires
from each sensor to the cooling unit are avoided.
2T rack sensors can also be initially installed on empty racks reserved for future growth with the control set to ignore these sensor readings. The extra 2T temperature sensor readings can also be displayed on the local display and reported remotely for monitoring purposes only; not impacting unit
operation. This function provides users with a built-in mini-monitoring system.
2T Sensor Placement Guidelines
The 2T rack sensors come with the Liebert CRV unit to help prevent any problem spots in the row.
Rack sensors help combat cooling problems related to recirculation air, uneven rack loading, and air
distribution. The 2T rack sensors are intended for cold aisle use only.
44
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.
To connect the temperature probes, use only cable with the following characteristics:
• 6 wires, 3 couples, shielded twisted pair
• termination: RJ-12
• coupling: according to Liebert iCOM user manual, SL-18835)
Option A:
•
•
•
•
•
•
•
•
•
3 x 2 x 0.14 mmq (min), twisted pairs, shielded
plenum rated
300V
(23/158°F / -5/+70°C)
flexible
characteristic impedance of 108-132 Ohm @50kHz
conductor resistance < 150 Ohm/km
flame-retardant
black jacketing
Option B:
•
•
•
•
•
•
•
•
•
24AWG
STP (Shielded Twisted Pair)
CMP (plenum rated)
<15pF capacitance per foot
300V
140°F / 60°C
black jacketing
flexibility: must maintain a certain, unspecified flexibility
UL and CSA approved
45
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. If any leaks are detected, repair
them and recharge as described in 7.0 - Refrigerant Connections.
5. At least 4 hours before startup, close the main switch and the compressor switch on the electrical
panel.
NOTE
The default setting for the Liebert iCOM control is for stand-alone operation. The stand-alone
mode allows users to turn on the unit simply by rotating the main switch on the electrical
panel. The yellow LED on the Liebert iCOM will light after the unit is turned on because
electrical power is present.
If the LED does not light:
• check the electrical panel power supply
• check the protection devices (e.g., thermal switches)
• check the fuses.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Verify that the crankcase heater is working.
Check to ensure that there are no water leaks.
If an external condenser or drycooler is installed, start it by supplying power to it.
Close all MCBs on the electrical panel.
Check the supply voltage on all phases.
Check the supply voltage on all phases for the external condenser or drycooler, if fitted.
Start the unit by pressing the On/Off switch.
Check the amp draw of all components (see 9.0 - Electrical Connections).
Check the amp draw of the external condenser/drycooler, if fitted.
If the compressor makes a loud, unusual noise, invert the electrical 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).
! WARNING
Risk of contact with rotating devices. Can cause injury or death.
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.
17. Ensure that all control system settings are correct and that there are no alarms. (See the Liebert
iCOM user manual, SL-18835, available at the Liebert Web site, www.liebert.com)
18. W Models Only: Verify the water flow is adequate.
19. W Models Only: For closed circuit units, ensure that the water pump starts when the
compressor starts.
47
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. Ensure that the fan operation controller on the external condenser/drycooler (if fitted) is
calibrated correctly, and that it controls the fan operation.
5. Record all of the following on the warranty inspection form:
a. All component voltages and 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
If desired, the unit will automatically restart on the return of power after a supply interruption (see
the Liebert iCOM user manual, SL-18835, available at the Liebert Web site: www.liebert.com).
To avoid an automatic cold restart of the compressor if a power interruption of several hours is
expected, stop the unit before the blackout. After power returns, allow the compressor to preheat
before restarting the unit.
Figure 43 Refrigerant line components
Solenoid Valve
Liquid Receiver Valve
Sight Glass
Thermostatic
expansion
valve
Filter
Dryer
Filter
Dryer
Inlet
Schrader
Valve
48
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. Technical
bulletins are enclosed with documentation onboard the unit.
NOTE
1. In the unlikely event of control system failure, the valve can be manually controlled with
the rotary knob. It can be used to drive the actuator into any position between 0 and 1.
2. When the actuator stem is completely down, the valve is open and chilled water coil is
supplied.
Figure 44 Position of the chilled water valve actuator (for 2- or 3-way valve)
0
1
Position indicator on
0 = CLOSED valve
(3-way valve: bypass open)
1
0
49
Position indicator on
1 = OPEN valve
(3-way valve: by-pass closed)
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.
Figure 45 Sensor location
The control system compares the relayed information with the programmed setpoint and proportional
band values and performs one of the following operations:
• Cooling—Direct expansion mode (DX): The compressor is started and the cold refrigerant flows
through the evaporator, thus cooling the air passing through it. For compressor operation see Liebert iCOM user manual, SL-18835.
• Chilled water mode (CW)—The three-way valve is opened and the chilled water flows through
the coil, thus cooling the air passing through it. For valve operation, see the Liebert iCOM user
manual, SL-18835.
• Reheating—Electrical heating (optional): The heating elements heat the air passing over them
during dehumidifcation.
• Dehumidification (DX mode)— The temperature of the cooling coil is reduced to remove moisture from the air. (Refer also to the Liebert iCOM user manual, SL-18835).
NOTE
If, during dehumidification, the ambient temperature drops below a specified level,
dehumidification will stop if necessary. (See the Dehumidification Low Limit section of the
Liebert iCOM user manual, SL-18835).
In dehumidification mode, the air after passing over the coil is reheated (if needed) by electrical
heaters to stabilize the initial temperature.
• Humidification (optional)—The humidifier creates steam, which is distributed into the air
stream via the steam distribution pipe. (See also Appendix A - - Humidifier).
50
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. (To prevent erratic
operation, do not use temperature and relative humidity setpoints/proportional bands that differ
excessively from the default settings.)
12.1
Thermostatic Expansion Valve
The Thermostatic Expansion Valve (TEV) performs one function: It keeps the evaporator supplied
with enough refrigerant to satisfy load conditions. It does not effect compressor operation.
Proper valve operation can be determined by measuring superheat. The correct superheat setting is
between 10 and 20°F (-12 and -6°C). If too little refrigerant is being fed to the evaporator, the superheat will be high; if too much refrigerant is being supplied, the superheat will be low.
12.1.1 Determine Suction Superheat
To determine superheat:
1.
2.
3.
4.
5.
Measure the temperature of the suction line at the point the TEV bulb is clamped.
Obtain the gauge pressure at the compressor suction valve.
Add the estimated pressure drop between the bulb’s location and the suction valve.
Convert the sum of the two pressures to the equivalent temperature.
Subtract this temperature from the actual suction line temperature. The difference is superheat.
12.1.2 Adjust Superheat Setting with the TEV
To adjust the superheat setting:
1. Remove the valve cap at the bottom of the valve.
2. Turn the adjusting stem counterclockwise to lower the superheat.
3. Turn the adjusting stem clockwise to increase the superheat.
NOTE
Make no more than one turn of the stem at a time. As long as thirty minutes may be required
for the new balance to take place.
12.2
Environmental Protection
Misuse or incorrect calibration of the unit leads to increased energy consumption, resulting in economic and environmental damage.
51
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.
! WARNING
Risk of contact with rotating parts and hot surfaces. Can cause equipment damage, injury and
death.
Perform maintenance only when the system is fully stopped.
• Turn Off the system by switching it Off at the controller and the main switch.
• Post a warning sign saying “Do not switch on.”
• Electrical components of the unit must be switched Off and checked to ensure they are not
receiving electrical input power.
NOTICE
Risk of improper maintenance. Can cause equipment damage.
All maintenance must be performed only by authorized properly trained and qualified
personnel.
Ignoring safety instructions can be dangerous to persons as well as to the environment. Soiled parts
always cause a loss of performance and, for switch or control devices, can lead to the breakdown of a
plant.
13.2
Spare Parts
Only original spare parts made by Emerson Network Power may be used. Using third-party material
can invalidate the warranty. When making seeking technical assistance, always refer to the component list supplied with the equipment, and specify the model number, serial number and, if available,
the part number.
NOTE
1. When replacing a faulty component, follow the relevant manufacturer instructions.
2. When the spare parts must be brazed, be careful not to damage the internal parts (gaskets,
seals, O-rings, etc.).
13.3
Maintenance Schedule
Conduct monthly, quarterly, biannual and annual checks according to the following guidelines.
All tasks and time periods listed here are the manufacturers’ regulations and must be documented in
an inspection report.
52
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.
Figure 46 Air filter location and input power safety switch
To extract the filters (refer to Figure 47:
1.
2.
3.
4.
5.
6.
Push up the upper filter.
Pull the bottom of the filter away from the Liebert CRV.
Pull it out of the unit.
Lift the lower filter up
Pull the bottom of the filter away from the Liebert CRV.
Pull it out of the unit.
Figure 47 Remove the air filters
Push filter up
Pull filter away from
Liebert CRV and out
Lift filter up
Pull filter away from
Liebert CRV and out
After cleaning or replacing the filter and before reassembling the unit, check that the air differential
pressure switch pipes (clogged filter alarm) are in the correct position and order. Check also that the
drain trays are clean and the pipe secure.
53
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.
Check for and clear obstructions in gravity lines leading to the condensate pump.
Remove the sump, clean with a stiff nylon brush and flush with water.
Inspect and clear clogs in the discharge check valve and float mechanism.
Reassemble and check for leaks.
Air-Cooled Condenser and Drycoolers
1.
2.
3.
4.
5.
6.
7.
Clear the coil surface of all debris that might inhibit airflow.
Check for and correct bent or damaged coil fins.
Do not permit snow to accumulate around or under an outdoor unit.
Consider having the coil surface commercially cleaned periodically.
Inspect fans, motors and controls for proper operation.
Check all piping and capillaries for proper support.
Inspect for leaks.
54
Maintenance
13.7
Electrical Heaters
1. Inspect and clean reheat elements.
2. Inspect and tighten support hardware.
Table 12
Maintenance schedule
Maintenance Period
Monthly
By User
Component
General
Filters
Check unit display for clogged-filter warning
X
Check for irregular noise from unit fans
X
Check for irregular noise from compressor (if
applicable)
X
Check for irregular noise from remote
condenser fan(s) (if applicable)
X
Every
3 Months
Check state of filters
X
Replace air filter if necessary
X
Check filter switch functionality
X
Check bearings
X
Check motor mounts for tightness
X
Check fan safety switch
X
Check condition of contacts
Electrical/Electronics
Steam-Generating
Humidifier
X
Check electrical connections
X
Check operation of controller
X
Check unit operation sequence
X
Check cylinder and pan
X
Check condition of steam hoses
X
Verify filling solenoid valve is operating properly
X
Check circuit for leakage/general condition
Cooling Water Circuit
(Water/Glycol and
Chilled Water Units)
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)
Check compressor noise/vibrations
Refrigerating Circuit
X
X
Check oil level through compressor sight glass
X
Adjust/tighten compressor/functional elements
X
Check sight glass for problem detection
X
Check starting/running amps
X
Check refrigerating circuit main pressures
X
Check compressor suction superheat
X
Check discharge temperature
X
Check subcooling
X
Check fan bearings
Air-Cooled
Condenser/Drycooler
(if applicable)
X
Check fan motor mounts for tightness
X
Check coil condition
X
Check pipeline supports
X
Check fan speed controller operation
Water/Glycol Pump
Annually
X
Verify impellers move freely
Blowers
Every
6 Months
See manual for the pump
55
X
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.
The Liebert CRV contains substances and components hazardous for the environment
(electronic components, refrigerating gases and oils). At the end of its useful life, the
Liebert CRV must be dismantled by specialized refrigerating technicians. The unit must be
delivered to suitable centers specializing in the collection and disposal of equipment
containing hazardous substances.
The refrigerating fluid and the lubricating oil inside the circuit must be recovered according to the
laws in the relevant country.
To recover the gas, use all the connections described in 7.0 - Refrigerant Connections.
13.9
F-Gas Regulation (EC) No. 842/2006
Stationary air conditioning placed in the European Community market and operating with fluorinated greenhouse gases (F-gas), such as R-134A, R-407C and R-410A, must comply with the F-gas
Regulation (applied since July 4, 2007).
Following considerations must be observed when operating with the above-mentioned equipment:
• Fluorinated greenhouse gases are covered by the Kyoto Protocol.
• The fluorinated greenhouse gases in this equipment should not be vented to the atmosphere.
• Referring to the value noted in Annex I of Regulation (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 any detected leakage;
b. ensure that they are checked for leakage by certified personnel;
c. ensure arrangements are put in place for the proper recovery by certified personnel.
d. In case of applications containing 3 kg (6 kg in case of hermetically sealed systems) or more of
F-gases, certified personnel and companies (according to Reg. 303/2008) provide regular leak
testing (according to Reg. 1516/2007 and Reg. 1497/2007) and maintain records of
maintenance activities in a dedicated log book.
e. Recovery for the purpose of recycling, reclamation or destruction of the fluorinated
greenhouse gases, pursuant to Art. 4 (Recovery) of Reg.842/2006, shall take place before the
final disposal of that equipment and, when appropriate, during its servicing and
maintenance.
• Operator, according to Reg. 842/2006, Article 2, point 6, means the natural or legal person exercising actual power over the technical functioning of the equipment and system covered by the Regulation. The State may, in defined, specific situations, designate the owner as being responsible for
the operator's obligations.
• Direct methods of leakage checking approved by the manufacturer (Reg. 1516/2007 and Reg.
1497/2007):
a. gas detection device adapted to the refrigerant in the system; the sensitivity of portable gas
detection devices (as a direct test method) shall be at least five grams per year.
b. proprietary bubble solutions / soapsuds.
56
Maintenance
• Additional information located in a dedicated label of the unit (Reg. 1494/2007):
a. Where fluorinated greenhouse gas is foreseen to be added to the equipment outside of the
manufacturing site at the point of installation, a dedicated label accommodates notation of
both the quantity (kg) pre-charged in the manufacturing plant and the quantity charged at
the installation site, as well as the resulting total quantity of F-gas as a combination of the
above-mentioned quantities, in a manner that conforms to legibility and indelibility.
Our split units are usually not pre-charged at the factory; in this case, the total quantity of
refrigerant charged in the unit must be written in the relevant label, during the commissioning operation at the installation site.
b. Our packaged units (not split) operating with F-gas are usually fully charged at the 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 information about refrigerant charge
quantities must be listed separately for each individual circuit.
e. For equipment with separate indoor and outdoor sections connected by refrigerant piping, the
label information will be on that part of the equipment that is initially charged with the
refrigerant. In case of a split system (separate indoor and outdoor sections) without a factory
precharge of refrigerant, the mandatory label information will be on that part of the product
or equipment that contains the most suitable service points for charging or recovering the
fluorinated greenhouse gas(es).
• Safety data sheets of F-gases used into the products are available on demand.
57
Troubleshooting
14.0 TROUBLESHOOTING
Table 13
Unit diagnostics
Problem
Possible Cause
Corrective Action
Dirty filters
Replace filters
Filter clog sensor failure
Call Emerson Network Power
Incorrect positioning of remote
temperature sensor(s)
Verify that remote temperature sensors are correctly
positioned
Remote temperature sensor(s) issue
Contact Emerson
Air-cooled units: Verify that remote condenser fan(s) are
running
Water/glycol units: Check cooling water supply
Condensation pressure is too high
Water/glycol units: Check cooling water temp
Rack temperature
is too high
Call Emerson Network Power
Chilled water units: inlet water
temperature is too high
Check cooling water temperature
Refrigerating circuit charge issue
Contact your local Emerson representative
Verify unit positioning/room configuration
Cold air short-cycling issues
Verify unit air baffles set-up
Verify cold aisle containment seals (if applicable)
Unit fan fails
to start
Water drops
carried by airflow
Water on the floor
around the unit
Cooling unit
noise level
is higher
than expected
Insufficient room-cooling capacity
Reduce rack heat load or add cooling units
(C unit) water-regulating valve issue
Contact your local Emerson representative
Unit safety devices intervention
Contact your local Emerson representative
Fan is faulty
Contact your local Emerson representative
Room humidity is over acceptable limit
Check room condition
Condensate pan drain is clogged
Contact your local Emerson representative
Problem with humidifier control
Contact your local Emerson representative
Unit is not properly levelled
Adjust the levelling feet
Unit condensate drain pipe is clogged
Remove pipe obstruction
Chilled water and water/glycol units: leak
in the water circuit
Locate and repair the leak
Piping insulation broken/damaged
Restore insulation integrity
Leak in the draining circuit
Contact your local Emerson representative
Condensate pump is faulty
Contact your local Emerson representative
Leak in the humidifier filling hose
Contact your local Emerson representative
Incorrect positioning of remote
temperature sensor(s)
Verify correct positioning of temperature sensors
Unbalanced heat load distribution
Redistribute rack heat load
Remote temperature sensor(s) issue
Contact your local Emerson representative
Unsteady
air delivery
temperature
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
Local display cable damaged
Replace cable
Local display is
not operational
and unit does not
operate
Local display configuration lost
Contact your local Emerson representative
Unit electrical supply is Off
Restore electrical supply
Unit main switch is Off
Switch On the unit
Control board supply issue
Contact your local Emerson representative
Control board issue
Contact your local Emerson representative
58
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. The objective is to concentrate current carrying minerals in the cylinder so that a smaller
volume of water is required to produce the rated steam output. This extends the life of the disposable
cylinder by minimizing electrode coverage and reducing energy use because the high concentration
allows a minimal drain rate. When 80% FLA is reached, the fill valve will open, refilling the cylinder
to 100% FLA. On occasion, the drain valve will also come on if the water 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 take over.
Figure 50 General diagram—humidifier operation
A.1.1 Humidifier Water Supply and Plumbing
The fill valve is sized for an extended water pressure range of 30 to 80 psi.
For installations where water pressure is less than 15 psi, add a pressure boost pump and notify the
factory; a fill valve with an oversized opening will be supplied.
For installations where water pressure is greater than 80 psi, install a pressure reducing valve in the
water feed line to the unit.
With dirty or muddy water sources (e.g., some well sources), ensure proper filtration by adding an
external filter to the water line entering the unit. (Consult factory for accessories such as filters.)
59
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. soft copper tubing is provided with the unit and
requires no soldering for the water connection to the unit.
An isolating valve should ALWAYS be placed in the feed water line to allow service of the fill valve.
Each unit is fitted with a fill solenoid valve located on the base drain pan.
Flow openings are designed for water pressure from 30 to 80 psi and are protected by the built-in
strainer.
For inlet water pressure outside this range, the factory should be contacted.
Figure 51 Water connection to humidifier
3/8" Cold Water
Olive Connection
7/8" Drain
Connection
Use 7/8" ID Hose from Factory
60
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.
Check all electrical connections for wires that may have become loose in shipping. Components damaged because of loose connections are NOT under warranty.
Check electrode plugs to ensure they are pressed firmly onto the electrode pins. Important: Loose connections will cause overheating of the cylinder plugs, possibly melting the plugs and/or cylinder.
1. Open the isolating valve in the feed water line to the unit.
2. Make sure the Liebert iCOM is set high enough to call for humidification.
3. Turn on the main disconnect in the primary service feeding the unit and check that unit has
power at the primary terminal block.
4. Push the auto On/Off/Drain Switch to “On.”
Water will start to enter the cylinder through its bottom port and rise in the cylinder to a point determined by the solid state control circuitry. It is not unusual upon initial startup for the water to fill the
cylinder and cycle on the red high-water sensor light.
The red light simply acts as a safety to shut off the fill valve and prevent overfilling. With the red
light on, the water in the cylinder will continue to heat and, after a few minutes, start to boil. After
the boiling of the water has lowered the water level below the sensor at the top of the cylinder, the red
light will go out and the fill solenoid will again open until the cylinder is again full. This cycling of the
red light and fill valve will continue until the unit's full output 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 drains only when necessary. If the cylinder
is manually drained, the above process will repeat itself.
A.1.4 Low Water Conductivity
Should normalization of the unit be required immediately after startup, the installer may speed up
the process by artificially increasing water conductivity. During a fill cycle, the installer should dissolve half a teaspoon of table salt (no more) in a cup of water and add it to the cylinder by means of
the fill cup attached to the plumbing section. Open the plumbing compartment and add salt solution
through cylinder outlet. Excessive amounts of salt will result in erratic operation of the unit; however,
normalization of the unit will occur automatically through the solid-state control sequence.
A.1.5 Cylinder Replacement
NOTICE
Risk of improper operation. Can cause equipment damage.
The steam cylinder is disposable and must be replaced at the end of cylinder life. Cylinder life
depends on water supply conditions and humidifier usage. Failure to replace the cylinder at
the end of cylinder life may result in unit damage.
After an extended period of operation, the cylinder will be completely used, as indicated by the red
high-water sensor light illuminated on the cabinet. When this condition is reached, a new replacement cylinder must be installed.
NOTE
The red light may come on during initial startup, but this does not mean the cylinder must be
replaced. See 10.0 - Startup and 11.0 - Operation.
61
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. When the cylinder is empty, push the auto On/Off/Drain switch to the Off position.
4. Open the main disconnect switch during the entire cylinder change operation.
5. The power wires to the cylinder are attached by cylinder plugs to the electrode pins on top of the
cylinder. Pull these plugs off the pins.
6. Using a slotted screwdriver, loosen the steam hose clamp(s) and pull the steam hose off.
The cylinder is now ready to be lifted out of the unit.
Installing the New Cylinder
1. Leave the main disconnect open until the cylinder is completely installed and reconnected.
2. Ensure that the cylinder mounting stubs are seated properly in the allotted side mounting slots
within the unit.
3. The white sensor plug on all units is for the sensor pin, which always goes on the single pin offset
from the others.
4. Ensure that cylinder plugs are snug on the pins.
5. Replace loose-fitting plugs; loose plugs may generate enough heat to melt and destroy the plug,
and new cylinder plugs must be ordered.
Reverse the procedure to install a new cylinder.
Figure 52 Sensor pins, cylinder plugs
White
Sensor
Plug
1
Sensor Pin
Cylinder
Plug
Cylinder Pin
Cylinder Pin
Humidifier Maintenance
! WARNING
Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power supplies before working within. The plumbing
and electrical compartments contain high-voltage components and wiring. The access cover is
attached with screws. Access should be limited to authorized personnel only.
62
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. Close the shutoff valve in the water supply line feeding the humidifier.
A.1.6 Humidifier Troubleshooting
Terms Used
• FLA (Full Load Amps) are amps listed on the humidifier specification label.
• Short cycling occurs when the humidifier’s “On time” is less than 10 minutes upon a call for
humidity. To correct short cycling, all humidifiers have a capacity adjustment that allows the output of the humidifier to be reduced to as low as 20% of rated output, thus extending the “on time”
required to maintain output.
• Foaming can occur when the impurities already in water reach an excess concentration as a
result of boiling away water and continued boiling agitates the contained water. The humidifier
electronics are designed to prevent foaming, although in extreme cases water will foam with little
concentration, making it necessary to increase the drain time of the water contained in the cylinder. Foaming is normally caused by short cycling, a restricted drain or back pressure. The foam
generated in these instances is conductive and may lead to false full-cylinder indication if the
level of the foam approaches the top of the cylinder.
• Back pressure is the restriction of steam flow caused by long steam runs, improperly sloped
steam lines, elbows changing the direction of steam flow from horizontal to vertical without a
drain leg, any plumbing detail allowing the accumulation of condensate, undersized steam line,
improper steam distributor, downward air flow onto the distributor causing excess static pressure
at the steam outlets, or high static pressure ducts (not probable). To overcome excess static pressure in the duct, use a fill cup extension kit. In downflow applications, a downflow distributor
should be used, but in some cases the fill cup extension will also be required.
• Reset unit (humidifier): To reset the humidifier, switch the auto On/Off/Drain switch at the front
of the humidifier to the Off position for at least five seconds, then switch it back to the On position.
• Monitored 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.
A.2
STARTING POINT
Auto On/Off/Drain switch in On position—unit will not fill:
When the On/Off control circuit is made and the Auto On/Off/Drain switch is pushed to On, the 24V
holding coil of the primary contactor should energize. The resulting magnetic pull closes the high voltage contacts with a distinct and audible “clunk.” If the contactor will not make the connection, then
inspect the following while referring to the wiring diagram:
•
•
•
•
Check for 24V across terminals 18 and 26 on the PC board.
The low-voltage 3A fuse located in the control box may be blown.
The contactor holding coil may be open or shorted.
The switch may be defective.
Recheck that the Auto On/Off/Drain switch is still On. If it is, shut off the main disconnect and check
fuses or breaker of the main disconnect. If they are serviceable, turn power back on.
To test for a defective Auto On/Off/Drain switch, connect a wire from the fuse directly to Terminal 6
on the external controls strip. If the contactor activates, the On side of the switch is defective. If the
contactor does not activate, the PC board could be defective.
If the 3A control fuse blows when the wire from the fuse touches Terminal 6 on the external controls
strip, the contactor holding coil may be shorted. Replace contactor if necessary.
After the necessary components have been replaced and the contactor pulls in, there is line voltage to
the cylinder and the control sequence can begin.
63
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. 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 activates, the basic PC board should be replaced. If it still does not activate, the fill valve coil should be
replaced. After the necessary components have been changed, water will start filling the cylinder and
begin to submerge the electrodes. Because of the high voltage across the electrodes, the water can now
conduct electricity.
Red “Change Cylinder” light on—Water at top of cylinder:
This is a common occurrence on startup. See 10.0 - Startup and 11.0 - Operation.
Water remains at high level and won't concentrate:
This is normal on cold startup and can be accelerated by adding a maximum of 1/2 tsp. of dissolved
salt to the cylinder on fill cycle through the plastic fill cup. See A.1.4 - Low Water Conductivity.
If the unit has been operating extensively, observe for normal fill-boil-fill-boil cycle; no drainage
should occur. If drainage occurs, check for leaking drain valve or back pressure.
Unit drains continually:
May be caused by foaming and/or back pressure, or leaking drain valve.
If cylinder is almost empty, check for magnetic pull on drain solenoid indicating miswiring. If there is
no pull, drain actuator is blocked open; remove, disassemble and clean.
If drain is occurring through activated drain valve, valve is miswired or electronics are faulty; consult
factory.
If drain is occurring through the overflow on the fill cup, this is due to abnormal restriction on the
steam line and back pressure forcing water out of the cylinder so water cannot concentrate and level
remains high. Review installation of steam line to ensure there are no blockages or excessive static
pressure in the air system.
64
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. Turn power switch to
'Drain' position. If drain valve is activated (sound of
solenoid), check connection to the board or board itself.
When no sound is present, check fuse (replace with 3.0 A if
needed), transformer (voltage should be present between
fuse holder and ground screw).
Off
Excess current. Operating
amperage exceeded 130% of rated
amps. Water is drained from the
cylinder (drain valve on for 10
minutes).
Check drain valve operation, drain time, possible drain
restrictions. Check fill valve for leaks (not holding supply
water). Back pressure may also cause very conductive
water conditions. Was the humidifier short cycling? Check
for short cycling. Water conductivity too high.
On
2 flashes in
sequence
Off
No current detection for 30 minutes
with continuous call for humidity.
Check water level in the cylinder - should be more than 1/4
full. If not, check fill rate, 24 VAC voltage on fill valve
terminals (unit must be on with call for humidity - green light
on steadily). Verify fresh water supply to the humidifier.
Leaking drain valve may be at fault (minerals blocking the
plunger). If cylinder is more than 1/4 full, check primary
power, connections to the cylinder, continuity of wires to
cylinder. Are power wires connected to proper terminals on
the cylinder? (Color coding.) Possibly wrong cylinder type.
Low water conductivity.
4 flashes in
sequence
Off
End of cylinder life - change
cylinder.
Check water level in the cylinder; should be about 3/4 full.
Check for foaming if water level is lower or cylinder life
shorter than expected. Change cylinder, clean drain valve.
65
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
31.1
OPD
50
100
80
50
100
80
15.0
35
Cooling with Dehumidifying, Condensate Pump and Humidifier; NO Reheat
FLA
27.9
53.8
42.8
27.9
53.8
42.8
7.9
16.7
WSA
32.9
63.1
49.3
32.9
63.1
49.3
9.9
20.9
OPD
50
100
70
50
100
70
15
25
Cooling with Dehumidifying and Condensate Pump; NO Reheat, NO humidifier
FLA
24.2
45.4
34.4
24.2
45.4
34.4
4.2
8.3
WSA
29.2
54.7
40.9
29.2
54.7
40.9
4.6
9.1
OPD
45
90
60
45
90
60
15
15
Cooling with Dehumidifying and Reheat; NO Condensate Pump, NO humidifier
FLA
30.5
59.7
48.7
30.5
59.7
48.7
10.5
22.6
WSA
37.4
73.1
59.3
37.4
73.1
59.3
13.1
28.3
OPD
50
100
80
50
100
80
15
30.0
Cooling with Dehumidifying, NO Condensate Pump, NO Reheat, NO Humidifier
FLA
23.0
43.1
32.1
23.0
43.1
32.1
3.0
6.0
WSA
28.0
52.4
38.6
28.0
52.4
38.6
3.4
6.8
OPD
45
80
60
45
80
60
15
15
FLA = Full Load Amps; WSA = Wire Size Amps (Minimum Supply Circuit Ampacity); OPD = Maximum Overcurrent Protective Device
Electrical data for a unit does not change if dehumidifying is enabled or disabled
Table 16
Calibrations of electrical components
Refrigeration Circuit
Item No.
Component
Setting
Notes
Contact
18-19
High Pressure
Transducer
Range 045 barg
Output 05V
14
Low Pressure
Transducer
Range 017.3 barg
Output 05V
3
High Pressure
Switch (HP)
STOP 37±1 barg
START 30.0±1.5 barg
(fixed setting manual reset)
Reset
Normally
Closed
—
Clogged Filter
Differential Pressure
Switch (CF)
Set point range 0.54 mbar
Filter G4 = 2 mbar
Setting Ring
Normally
Closed
66
see Liebert iCOM
user manual, SL-18835
—
—
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. The recommended oil is EMKARATE RL 32-3MA.
Refrigerant charge 1
Table 18
Liquid (+), at Different Condensing
Temperatures - R-410A, lb/ft (kg/m)
External Pipe Diameter
in (mm)
Gas R-410A,
lb/feet (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 varies according to condensing temperature (see refrigerant tables).
1. For distance D see Figure 53 - Pipeline air conditioner - condenser
Table 19
Air-cooled condenser refrigerant charge
VFD
Liebert Lee-Temp
(inc. receiver)
Model
lb (kg)
lb (kg)
28 K
7 (3.2)
46 (20.9)
60 K
16 (7.3)
84 (38.1)
90 K
25 (11.3)
120 (54.4)
Topping up is requested for short pipeline, too, due to the extra-charge of refrigerant.
The air conditioner is supplied pressurized with helium at 1 bar.
Figure 53 Pipeline air conditioner - condenser
C
COND
B
(Distance) D = A + B + C
CDT
CDT = Conditioner
COND = Condenser
Table 20
A
Refrigerant and oil charge for water-cooled models
R-410A
Refrigerant Charge
Initial Oil
Charge 1
Model
lb (kg)
oz (kg)
CR020RW
14.3 (6.5)
60 (1.68)
CR035RW
19 (8.6)
110 (3.08)
The air conditioner is supplied complete with refrigerant and oil.
1. The recommended oil is EMKARATE RL 32-3MA.
67
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.
25-9/16"
(650mm)
27-9/16"
(700mm)
13-3/4"
(350mm)
23-5/8"
(600mm)
25-9/16"
(650mm)
3"
(75mm)
46-1/4"
(1175mm)
3-15/16"
(100mm)
107-5/16"
(2725mm)
REAR
TOP
46-1/4"
(1175mm)
Air
filter
21-5/8"
(550mm)
3-15/16"
(100mm)
Table 21
23-5/8"
(600mm)
27-9/16"
(700mm)
DPN001791
Rev. 1
Dry weight, all model types, ± 5%
Model Type
Model No.
Air Cooled,
lb (kg)
Water/Glycol,
lb (kg)
Chilled Water
lb (kg)
CR035R
CR020R
CR040R
805 (365)
739 (335)
—
849 (385)
772 (350)
—
—
—
728 (330)
68
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"
(544.5mm)
FRONT
69
23-5/8"
(600mm)
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.
Unsolder when
connecting
through bottom
TOP
CONNECTIONS
BOTTOM CONNECTIONS
(possible with raised floor)
1-1/8"
(28mm)
23-5/8"
(600mm)
3-1/4"
(83mm)
17-5/16"
(440mm)
9-1/2"
(242mm)
2-11/16"
(69mm)
HF
DP
OG
IL
2-15/16"
(74mm)
3-1/16"
(77mm)
9-5/16"
(237mm)
IL
2-11/16"
(69mm)
3-13/16"
(97mm)
5"
(127mm)
EC-HV
1-3/8"
(35mm)
EC-LV
2-3/16"
(56mm)
2-1/8"
(54mm)
(3-1/16")
(77mm)
EC-HV
12-3/4"
(325mm)
OG
HF/HD
2-11/16"
(69mm)
46-1/4"
(1175mm)
1-3/4"
(45mm)
9-3/4"
(248mm)
8-7/8"
(226mm)
5-1/8"
(130mm)
3-7/8"
(98mm)
CD or DP
EC-LV
7-13/16"
(199mm)
2-3/16"
(56mm)
3-1/4"
(83mm)
Table 22
1-3/4"
(44mm)
DPN001792
Rev. 0
Unit connections, air-cooled models
Unit Connections
IL
OG
CD 1
Refrigerant liquid line inlet
Refrigerant gas line outlet
Condensate drain
HF
Humidifier feed
HD 1
DP
Humidifier drain
Pump drain
EC-HV
Electrical supply-high voltage
EC-LV
Electrical supply-low voltage
CR20A
CR35A
OD 1/2" Cu Sweat
OD 5/8" Cu Sweat
OD 5/8" Cu Sweat
OD 7/8" Cu Sweat
1" MPT
1/2" FPT for top connection,
1/4" compression for bottom connection
1" MPT
1/2" FPT
Combination hole knockout diameter:
1-3/8", 1-3/4" and 2-1/2" (35, 44.5 and 63.5mm)
Hole diameter: 7/8" (22); Typical 2 places
1. With pump, CD is connected with HD. See DP.
71
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. 0
23-5/8"
(600mm)
Unit connections, water/glycol-cooled models
UNIT CONNECTIONS
IWC 1
IWC
3-1/16" 3-7/8"
(77mm) (98mm)
3-13/16"
(97mm) EC-HV
EC-HV
1-3/4"
(44mm)
HF/HD
2-11/16"
(69mm)
2-3/16"
(56mm)
OWC
8-7/8"
(226mm)
9-5/16"
(237mm)
46-1/4"
(1175mm)
5"
(127mm)
2-15/16"
(74mm)
IWC
2-11/16"
(69mm)
1-3/4"
(45mm)
1-1/8"
(28mm)
9-3/4"
12-3/4"
(248mm)
(325mm)
OWC
CD 2
Water to condenser inlet
Water from condenser inlet
Condensate drain
HF
Humidifier feed
HD 2
DP
Humidifier drain
Pump drain
EC-HV
Electrical supply-high voltage
EC-LV
Electrical supply-low voltage
CR20W
CR35W
1-1/4" FPT
1-1/4" FPT
1-1/4" FPT
1-1/4" FPT
1" MPT
1/2" FPT for top connection,
1/4" compression for bottom
1" MPT
1/2" FPT
Combination Hole Knockout Diameter:
1-3/8", 1-3/4" and 2-1/2" (35, 44.5 and 63.5mm)
Hole Diameter: 7/8" (22); Typical 2 places
1. Install a 16-20 mesh strainer on the glycol/water supply to prevent particles from entering the heat exchanger.
2. With pump, CD is connected with HD. See DP.
72
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. 0
23-5/8"
(600mm)
Table 24
5-1/8"
(130mm)
2-3/16"
(56mm)
2-1/8"
(54mm)
3-1/4"
(83mm)
3-1/16"
(77mm)
ICW
3-13/16"
(97mm) EC-HV
EC-HV
1-3/4"
(44mm)
HF/HD
2-11/16"
(69mm)
46-1/4"
(1175mm)
5"
(127mm)
OCW
8-7/8"
(226mm)
9-5/16"
(237mm)
2-11/16"
(69mm)
1-3/4"
(45mm)
2-15/16"
(74mm)
3-1/16"
(77mm)
1-1/8"
(28mm)
9-3/4"
12-3/4"
(248mm)
(325mm)
Unit connections, chilled water models
UNIT CONNECTIONS
CR40C
ICW
OCW
CD 1
Chilled water inlet
Chilled water outlet
Condensate drain
HF
Humidifier feed
HD 1
DP
Humidifier drain
Pump drain (optional)
EC-HV
Electrical supply-high voltage
EC-LV
Electrical supply-low voltage
1-1/4" FPT
1-1/4" FPT
1" MPT
1/2" FPT for top connection,
1/4" compression for bottom connection
1" MPT
1/2" FPT
Combination Hole Knockout Diameter:
1-3/8", 1-3/4" and 2-1/2" (35, 44.5 and 63.5mm)
Hole Diameter: 7/8" (22); Typical 2 places
1. With pump, CD is connected with HD. See DP.
73
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
2.50" (64mm) diameter concentric knockout.
4. Low-voltage entrance through the top of the unit—Quantity (2) 1.125" (28mm) diameter
knockouts.
5. Three-phase electrical service—Connect to terminals on disconnect switch. Three-phase
service not by Liebert.
6. Factory-installed locking disconnect switch
7. Earth ground—Terminal for field supplied earth grounding wire.
8. Remote unit shutdown—Replace existing jumper between Terminals 37 & 38 with
field-supplied, normally closed switch having a minimum 75VA, 24VAC rating. Use field-supplied
Class 1 wiring.
9. Customer alarm inputs—Terminals for field-supplied, normally closed contacts, having a
minimum 75VA, 24VAC rating, between Terminals 3 and 50, 2 and 51, 5 and 55, or 3 and 56. Use
field-supplied Class 1 wiring.
10. Common alarm—On any alarm, normally open dry contact is closed across Terminals 75 and 76
for remote indication. 1 AMP, 24VAC maximum load. Use Class 1 field-supplied wiring.
11. Heat rejection interlock—On any call for compressor operation, normally open dry contact is
closed across Terminals 70 and 71 to heat rejection equipment. 1 AMP, 24VAC max load. Use
Class 1 field-supplied wiring.
E.2
OPTIONAL ELECTRICAL CONNECTIONS
12. Smoke sensor alarm—Factory-wired dry contacts from smoke sensor are 91-common, 92-NO,
and 93-NC. Supervised contacts, 80 and 81, open on sensor trouble indication. This smoke sensor
is not intended to function as, or replace, any room smoke detection system that may be required
by local or national codes. 1 AMP, 24VAC max load. Use Class 1, field-supplied wiring.
13. Reheat and humidifier lockout—Remote 24VAC required at Terminals 82 and 83 for lockout
of reheat and humidifier.
14. Condensate alarm (with condensate pump option)—On pump high water indication,
normally open dry contact is closed across Terminals 88 and 89 for remote indication. 1 AMP,
24VAC maximum load. Use Class 1, field-supplied wiring.
15. Common Alarm—On any alarm, one additional normally open dry contact is closed across
Terminals 94 and 95 for remote indication. 1 AMP, 24VAC max load. Use Class 1, field-supplied
wiring.
16. Liebert Liqui-tect™ shutdown and dry contact—On Liebert Liqui-tect activation, normally
open dry contact is closed across Terminals 58 and 59 for remote indication (Liebert Liqui-tect
sensor ordered separately). 1 AMP, 24VAC max load. Use Class 1, field-supplied wiring.
NOTE
Refer to specification sheet for total unit full load amps, wire size amps, and maximum
overcurrent protective device size.
74
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 Alarm (optional)
10 - Common Alarm
15 - Common Alarm (optional)
3-Phase Electric
Service and Locking
Disconnect Switch
(factory-installed)
High-Voltage
Wiring Bottom
Low-Voltage
2.5" (64mm)
Wiring Top Entry Entry
Knockout
(typical 2)
1.13" (29mm)
Knockout
Unit Base
75
DPN001884
Rev. 0
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
Valve
Check Valve (not supplied
with the condenser)
Access Valve
Shutoff
Valve
Sweat Joint
Sweat Joint
Condenser
External
to Liebert
CRV Unit
Air-Cooled Condenser
to disconnect for
bottom connections
DPN001984
Rev. 0
Check Valve (not
supplied with the
condenser)
76
Filter
Dryer
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 Valve
Check
Valve,
145psi
(10bar)
Vibration
Absorber
(External
on CR20)
Thermostatic
Expansion
Valve
Compressor
Liquid
Receiver
Access
Valve
Head-Pressure
Control Valve
Valve
Fittings
Blind
Disk for
2-Way
Valve
Water-Cooled
Condenser
DPN001985
Rev. 0
Water/Glycol Inlet
(bottom connections)
77
Shutoff
Solenoid
Valve
Sight
Glass
Filter
Dryer
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. Enterprises benefit
from greater IT system availability, operational flexibility and
reduced capital equipment and operating costs.
Technical Support / Service
Web Site
www.liebert.com
Monitoring
liebert.monitoring@emerson.com
800-222-5877
Outside North America: +800 1155 4499
Single-Phase & Three-Phase UPS
liebert.upstech@emerson.com
800-222-5877
Outside North America: +800 1155 4499
Environmental Systems
800-543-2778
Outside the United States: 614-888-0246
Locations
DATA CENTER SOLUTIONS
For More Information:
(866) 787-3271
Sales@PTSdcs.com
While every precaution has been taken to ensure the accuracy
and completeness of this literature, Liebert Corporation assumes no
responsibility and disclaims all liability for damages resulting from use of
this information or for any errors or omissions.
© 2009 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change
without notice.
® Liebert is a registered trademark of Liebert Corporation.
All names referred to are trademarks
or registered trademarks of their respective owners.
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