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Operation
41 Liebert
®
iCOM
®
3.5 Liebert Air Economizer
™
Operation
Liebert cooling units control the Liebert Air Economizer with the analog outputs of the Liebert iCOM
control. The Liebert iCOM can be used with a Liebert Air Economizer or with a air economizer
supplied by others if equipped with 0-10VDC or 2-10VDC dampers. The Liebert iCOM is capable of
driving two independent damper motors or can be set up through the software to output a single
signal where the dampers are inversely driven.
The primary cooling unit responds to sensors that monitor the temperature and humidity of the
outdoor air, return air and supply air. If outdoor conditions are within the tolerances set, the primary
cooling unit opens the Liebert Air Economizer’s dampers varying amounts to use outdoor air for
cooling. When outdoor conditions are too warm or humid for cooling, the primary cooling unit closes
the Liebert Air Economizer’s dampers, taking it out of the cooling process. Humidification and
dehumidification are disabled when the Liebert Air Economizer is operating.
NOTICE
Risk of high or low humidity. Can cause environmental conditions that are outside equipment
requirements.
While the Liebert Air Economizer is operating, the primary cooling unit’s humidification and
dehumidification are inhibited. If humidity level is important to operational requirements, it
must be controlled by other methods during operation of the Liebert Air Economizer. While
the primary cooling unit is cooling without the Liebert Air Economizer, the primary cooling
unit will control humidity levels according to its setpoints.
NOTICE
Risk of freezing temperatures. Can cause equipment and property damage.
Low outdoor temperatures can produce freezing conditions that adversely affect cooling
systems employing water, particularly when the water is not moving through the pipes. When
cooling system water is not moving, frozen waterlines, burst coils and water damage are
possible. The outside damper must be set so that it is fully closed when freezing temperatures
are possible and the cooling system is not operating (see 3.5.3 - Disable the Liebert Air
Economizer). This can be achieved by either connecting a freeze stat that interrupts the
economizer signal or by wiring a freeze stat directly into the Liebert iCOM’s customer input.
The risk of freezing is increased unless the proper amount of glycol is added to the chilled
water unit loops.
NOTICE
Risk of infiltration of odors, smoke and particulates from outside air. Can cause
environmental conditions that are outside equipment requirements.
The Liebert Air Economizer does not remove odors, smoke, gases or particulates from the
outside air used for cooling. These must be controlled by other methods.
When the Liebert Air Economizer is being used for cooling, both the outside air damper and the room
return air damper are active in an opposing relationship. The cooling requirement and temperature of
the outdoor air will determine the position of the outside air damper. It will range from fully closed to
fully open. As the outside air damper moves toward fully open, the return air damper will close to a
minimum of 15%. The 15% minimum is to make sure that air remains circulating near the return air
sensor. If the return air sensor is moved to another position where there is constant circulation of air
in both outdoor and indoor modes, then the minimum 15% indoor damper position can be removed.
NOTICE
Risk of improper operation. Can cause degraded cooling and ventilation operation because of
improper building air pressure.
The incoming air from the outside damper requires expelling an equal volume of air through a
field-provided powered relief air vent. The volume that must be expelled will vary from 0 to
80% of the total airflow for all Liebert Air Economizer
™
units. The powered relief system
should be sized for 80% of the total airflow for all Liebert Air Economizer units in the
conditioned space and to maintain minimal building air pressure.
- 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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