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Operation
47 Liebert
®
iCOM
®
Outdoor Sensor Sharing
When multiple cooling units with Liebert iCOM and Liebert Air Economizer are networked, the
control can be set up to share the outside air sensors of all the units connected in the U2U group.
Outdoor air sensor sharing is enabled on SA16. When set to Shared, all the outdoor temperature and
humidity readings are averaged among all connected units. The average calculation is used to
determine air economizer eligibility on lines SA04 through SA06.
Upon startup after a loss of power to the Liebert iCOM control board, the main fan will operate at
100% for 5 minutes. After the fan has run at 100% for 5 minutes, the standard fan control will be able
to modulate the fan. For other control modes, refer to Variable Speed Fans—EC or Variable
Frequency Drives on page 20.
3.5.3 Disable the Liebert Air Economizer
The Liebert Air Economizer can be disabled using a hard-wired deactivation switch, through the
iCOM display, or through a remote monitoring system using a Liebert IntelliSlot
®
card.
A field-installed and wired normally closed deactivation switch may be connected to Terminals 24 and
51 in place of the factory-supplied jumper. Removing a factory-installed jumper will deactivate the
unit’s air economizer function (see Figure 41) and produces an FC Lockout warning. A normally open
deactivation switch may also be used. Line S227 of the Service Menu > Set Alarms must be changed
from Opened to Closed.
The Liebert Air Economizer may be disabled by changing SA02 Enable Economizer to No.
The Liebert Air Economizer may be disabled through a remote monitoring system by writing a
disable command to data label Air Economizer Control. When disabled, SA02 status will read No. The
building management system may override SA04 through SA07 by writing an enable command.
When the enable command is written, SA02 will read Remote. Refer to the Liebert IntelliSlot
®
Modbus 485, Modbus IP and BACnet IP Reference Guide, SL-28170, for additional information. The
manual is available at the Liebert Web site: www.liebert.com
Deactivating the Liebert Air Economizer will transfer all cooling to the secondary source.
Air Economizer Remote Status Indication
The K11 relay can be activated when the Liebert iCOM determines that the conditions are acceptable
for the Liebert Air Economizer
™
to operate. This relay will remain active during a BMS remote
deactivation of the Liebert Air Economizer.
Figure 41 Deactivation switch
NOTE
Lines S137 through S141 are not applicable to the Liebert Air Economizer.
24 51
Liebert Air Economizer
Deactivation Switch
Terminals 24 and 51
Factory-Installed Jumper
Customer must remove jumper
and connect normally closed
contact to Terminals 24 and 51.
Open the contact to deactivate
the Liebert Air Economizer
functionality.
Main unit will continue to run without
the Liebert Air Economizer feature.
DPN001449
Pg. 6, Rev. 2
- 2
- TABLE OF CONTENTS 3
- 1.0 INTRODUCTION 11
- 2.2 System Screen 16
- USER MENUS 20
- 2.5 Display Setup 22
- Figure 16 User menu icons 24
- Table 2 User menu icons 24
- Figure 17 Service menu icons 26
- Table 3 Service menu icons 26
- 3.0 OPERATION 28
- Autorestart 29
- Loss of Power Alarm 29
- Minimum Fan Speed 31
- Operation 32
- 3.1.4 Power Monitoring 33
- Low-Pressure Time Delay 33
- Advanced DX Freeze Protection 33
- Pump Down 34
- High-Pressure Alarm 34
- 25 Liebert 35
- Settings 37
- 3.3 Temperature Control 39
- 3.3.1 Setting Up PI Control 41
- 3.3.2 Compressor Control 42
- Compressor Proportional Bands 42
- 3.4 Liebert Fluid Economizer 45
- Cooling—Free-Cooling 47
- Dual-Cooling Source 48
- 3.4.2 Liebert Air Economizer 48
- DETAIL CDETAIL B 49
- DETAIL D 49
- FRONT VIEW 49
- Both possible low-voltage 50
- Determine which applies 50
- 3.5 Liebert Air Economizer 51
- Operation 51
- System Overview 52
- 3.5.1 Liebert Air Economizer 52
- (Not by 53
- Emerson) 53
- Not in Operation 54
- Startup Configurations 54
- 45 Liebert 55
- 47 Liebert 57
- 3.6.2 SCR Reheat 60
- Tight Mode 60
- 3.7 Humidity Control 61
- 53 Liebert 63
- 3.7.1 Humidification 64
- Infrared Humidifier 64
- 3.7.2 Dehumidification 64
- Dehumidification Low Limit 65
- 57 Liebert 67
- 3.8 Supply Control 68
- 59 Liebert 69
- 3.9.1 Operation 70
- Temperature Compensation 70
- Racks with Equipment 75
- Figure 60 S190 Limit 77
- Figure 61 S190 Control 77
- 3.10.2 User Inputs 81
- 3.10.3 Analog Inputs 82
- 3.10.4 Liebert iCOM-DO 83
- Calculating Unit Wellness 85
- 4.0 TEAMWORK 87
- 4.2.2 No Teamwork 88
- 4.2.3 Teamwork Mode 1 88
- 4.2.4 Teamwork Mode 2 89
- Fixed Speed 90
- Variable Speed 90
- Teamwork 91
- 81 Liebert 91
- Figure 66 Remote sensors 92
- Figure 67 Sensor positioning 92
- 4.2.6 Hardware Setup 93
- 4.3.2 DIP Switch Settings 94
- Unterminated 96
- Terminated 96
- 87 Liebert 97
- 4.3.7 Software Setup 99
- 4.3.8 Standby—Rotation 99
- Standby and Cascade 100
- 91 Liebert 101
- Small Displays 103
- Small Graphics Display 105
- Liebert iCOM 106
- I/O Board 106
- Optional Large 107
- Graphics Display 107
- (Rear View) 107
- Liebert vNSA 108
- SITESCAN 109
- 6.2 Monitoring Points 110
- 7.0 USER MENU PARAMETERS 111
- User Menu Parameters 112
- 103 Liebert 113
- 7.2 User-Graphic Menu Screens 114
- Event Log 115
- View Network 115
- 107 Liebert 117
- 109 Liebert 119
- 111 Liebert 121
- 113 Liebert 123
- Active Alarms 124
- 115 Liebert 125
- 117 Liebert 127
- 119 Liebert 129
- 8.0 SERVICE MENU PARAMETERS 131
- Service Menu Parameters 132
- 123 Liebert 133
- 125 Liebert 135
- 127 Liebert 137
- 129 Liebert 139
- 131 Liebert 141
- 133 Liebert 143
- 135 Liebert 145
- 137 Liebert 147
- 139 Liebert 149
- 141 Liebert 151
- 143 Liebert 153
- 145 Liebert 155
- 147 Liebert 157
- 149 Liebert 159
- Set Alarm Screens, Pages 4-11 160
- 151 Liebert 161
- 153 Liebert 163
- 155 Liebert 165
- 157 Liebert 167
- Freecool Sensor 168
- 159 Liebert 169
- 161 Liebert 171
- 163 Liebert 173
- 165 Liebert 175
- 167 Liebert 177
- 169 Liebert 179
- 171 Liebert 181
- 173 Liebert 183
- 175 Liebert 185
- 181 Liebert 191
- (read only) 193
- Technical Support / Service 196
- Locations 196
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