Emerson Liebert iCOM User Manual Page 138
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Service Menu Parameters
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S149 Fan Temp Prop/Integral—Adjusts the fan speeds rate of change based on the actual sensor
values deviation from setpoint. The smaller this number, the faster the fans will increase speed. Too
small of a number may cause the fans to increase decrease and overshoot setpoint.
Temperature Integration Time—Adjusts the fans of the unit based on time away from setpoint so
that accurate temperature control can be maintained. The proportional and integral work
together to maintain setpoint. Large P-Band with Small I-Time is typical to achieve a stable
control.
S150 Fan Deadband—Avoids overshooting of the setpoint. The value entered in this field will be
split in half by the fan speed setpoint.
S151 Airflow Calibration—Allows the front display to be scaled to show the actual percentage of
airflow independent of the voltage operating the fan speed. This value cannot be set above the Analog
Output High Limit or below the Analog Low Limit for the fan set in the Advanced Menu. This also
includes the service menu fan speed parameters.
S152 Fanspeed Min/STD—Sets the range for the variable fans. Min sets the minimum speed that
the fan will operate at. Fan speed is modulated between the MIN and STD based on which sensor is
set to control, setpoint and the PI settings. If the controlling sensor is set to manual, then the STD
setting will control the current fan speed. This parameter is also adjustable through the BMS.
S153 Fanspeed Dehum/No Power—Sets the fan speed when a call for dehumidification is active.
This allows the units fan speed to be ramped lower to help with any overcooling due to the
dehumidification process. This also allows the coil to remove additional moisture even faster.
S154 Allow Fan Modulation on Comp—Provides the option to set the fan to fixed speed if unit is
equipped with compressors. Once this parameter is set at the local display, it must be removed at the
local display to re-engage fan speed control.
S155 High Return Limit Enable—Sets a control point that will increase the fanspeed if the return
temperature exceeds the limit set in the High Return Temperature Limit parameter. If set to
DISABLED, no limit will be applied to the return air temperature. If set to LOCAL, then only the
local units return temperature will be monitored for applying the limit. If set to TEAM, then the
highest networked unit return temperature will activate the limit on all connected units.
S15A High Return Temperature Limit—Sets the temperature limit that will increase the fan
speed to decrease the return temperature. Some compressors may require this limit to prevent
extremely high return temperatures that could potentially cause degradation of the compressor oil,
that could decrease the overall compressor life expectancy.
S15B Return Limit P-Band—Sets the rate of fanspeed increase as the actual return temperature
approaches the limit set in the High Return Temperature Limit parameter.
Figure 109 Setpoints screen, page 6 of 9
- 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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