Emerson Liebert iCOM User Manual Page 66
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Operation
Liebert
®
iCOM
®
56
3.8 Supply Control
The supply temperature sensor should be placed in an area that is influenced only by the unit it is
connected to.
The Supply Air sensor can be used to control or reference the discharge air temperature of the cooling
unit. This sensor can be added to existing Liebert iCOMs by purchasing the supply sensor and wiring
harness. The supply air sensor must be connected to P13 pins 1 & 2. Contact your local Emerson
representative for pricing and installation.
• When the supply sensor is set to Control, the unit will control the amount of cooling / heating
being provided based on maintaining the discharge air temperature. The return air sensor may
still be used to control fan, humidity or as temperature/humidity reference of the room.
• Supply Limit: Chilled water units may be set up with the supply air sensor to maintain a
minimum air temperature under a raised floor to help prevent condensation. To avoid supply
temperatures that are too low, the Supply Limit can influence the opening of three-point or
analog actuators or the output of analog valves. The control compares the deviation from the
return air setpoint and the supply limit setpoint and calculates the output to the actuator from
the smaller deviation.
When the supply air sensor is set up for Temperature control, additional Supply Air configuration
parameters (valve pulse, cooling filters and return compensation) can be used to further enhance
the supply air control.
• The valve pulse and cooling filter timer can be adjusted to prevent oscillating around the supply
setpoint and still allow for rapid valve adjustments to compensate for heat load changes. Contact
your local Liebert service personnel for adjustments.
• Return Compensation begins to increase the supply air setpoint when the return air decreases
below the return air setpoint.
Example
Setting the return compensation value in the Service, Setpoints menu to 5°F (2.7°C) will
increase the supply setpoint from 50°F to 55°F (10°C to12.8°C) when the return temperature is
at the low limit of the proportional band.
NOTE
On units equipped with a 3P actuator type valve, response can be improved bu using the
feedback signal. Feedback is not required for supply air control and is not available on units
with fluid economizer. See 3.2.3 - Chilled Water Control.
NOTE
Supply control and limit are calculated on each unit, independent of the other sensor readings
on the network.
- 2
- TABLE OF CONTENTS 3
- 1.0 INTRODUCTION 11
- 2.1 System Screen 14
- 5Liebert 15
- 2.2 Main Unit Screen 16
- 2.3.2 Accessing Submenus 17
- Display Filtering 19
- 2.3.3 Entering a Password 20
- Figure 14 User menu icons 23
- Table 2 User menu icons 23
- Figure 15 Service menu icons 24
- Table 3 Service menu icons 24
- 3.0 OPERATION 26
- Autorestart 27
- Loss of Power Alarm 27
- Minimum Fan Speed 29
- Operation 30
- Low-Pressure Time Delay 31
- Advanced DX Freeze Protection 31
- Pump Down 32
- High Pressure Alarm 32
- 23 Liebert 33
- Settings 34
- 25 Liebert 35
- 3.2.2 Compressor Control 36
- Compressor Proportional Bands 36
- 27 Liebert 37
- 3.2.3 Chilled Water Control 38
- 29 Liebert 39
- 31 Liebert 41
- Cooling—Free-Cooling 42
- Dual-Cooling Source 42
- DETAIL CDETAIL B 43
- DETAIL D 43
- FRONT VIEW 43
- DETAIL E 44
- 35 Liebert 45
- 3.4 Liebert Air Economizer 46
- Operation 46
- 37 Liebert 47
- 3.4.2 Liebert Air Economizer 48
- System Overview 48
- (Not by 49
- Emerson) 49
- Out of Service 50
- 41 Liebert 51
- 43 Liebert 53
- 3.5.2 SCR Reheat 57
- Tight Mode 57
- 3.6.1 Humidification 59
- Infrared Humidifier 59
- 3.6.2 Dehumidification 60
- Dehumidification Low Limit 60
- . If the proportional 63
- Setting Up PI control 64
- 3.8 Supply Control 66
- 3.9.1 Operation 67
- Temperature Compensation 68
- Racks with Equipment 73
- Figure 59 S190 Limit 75
- Figure 60 S190 Control 75
- 67 Liebert 77
- 3.10.2 User Inputs 80
- and Liebert DS 81
- Air-Cooled Units 81
- 3.10.4 Liebert iCOM-DO 82
- Calculating Unit Wellness 84
- 75 Liebert 85
- 4.0 TEAMWORK 86
- 4.2.2 No Teamwork 87
- 4.2.3 Teamwork Mode 1 87
- 4.2.4 Teamwork Mode 2 88
- Fixed Speed 89
- Variable Speed 89
- Teamwork 90
- 4.2.6 Hardware Setup 91
- 4.3.2 DIP Switch Settings 92
- Unterminated 94
- Terminated 94
- 85 Liebert 95
- Grounded CANbus Cable 97
- 4.3.8 Software Setup 99
- 4.3.9 Standby—Rotation 99
- Standby and Cascade 100
- 91 Liebert 101
- Small Displays 104
- Large Displays 104
- 95 Liebert 105
- Small Graphics Display 106
- Liebert iCOM 107
- I/O Board 107
- Graphics Display 108
- (Rear View) 108
- Optional Large 108
- SITESCAN 110
- 6.1 Terminals 77 and 78 111
- via 77/78 112
- 7.0 USER MENU PARAMETERS 113
- User Menu Parameters 114
- 105 Liebert 115
- 7.2 User-Graphic Menu Screens 116
- Event Log 117
- View Network 117
- 109 Liebert 119
- 111 Liebert 121
- 113 Liebert 123
- Active Alarms 125
- 117 Liebert 127
- 119 Liebert 129
- 121 Liebert 131
- 8.0 SERVICE MENU PARAMETERS 132
- Service Menu Parameters 133
- 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 4-10 160
- 151 Liebert 161
- 153 Liebert 163
- 155 Liebert 165
- 157 Liebert 167
- 159 Liebert 169
- 161 Liebert 171
- 163 Liebert 173
- 165 Liebert 175
- 167 Liebert 177
- 169 Liebert 179
- 171 Liebert 181
- 9.0 MONITORING POINTS 187
- Example of points generated 188
- Monitoring Points 189
- 179 Liebert 189
- Technical Support / Service 192
- Locations 192
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