Emerson Liebert ICOM-DO User Manual Page 44
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Operation
Liebert
®
iCOM
®
for Liebert DSE
™
36
External Humidifier Control—Optional
A factory-supplied option may be provided to allow a start-stop command to be sent to the control of a
remote-mounted humidifier.
Steam Generating Canister Humidifier
The Steam Generating Humidifier has its own separate control board that manages the canister and
steam rate. Liebert iCOM sends an On-Off command to relay a call for humidification.
3.5.3 Dehumidification
The Dehumidification Enable parameter (Service Menu, Options Setup) allows for enabling/disabling
the dehumidification function.
A call for dehumidification is calculated in the same way as a cooling request. The components
(compressors) will follow this dehumidification request as soon as it is higher than the request for
cooling.
DA125 and DA150 Dehumidification Control
The DA125 and DA150 are designed to maximize sensible cooling not latent cooling loads. With all
four compressors running, no reheat will be available at this dehumidification load point (Stage 4).
The room load must be 94.1kW (74% of unit capacity) to prevent overcooling the room at 85°F (29°C)
return air temperature. If the room load is too low to maintain the setpoint, the compressors will cycle
On and Off. During Stage 3, with three of the four compressors running, 10kW of reheat will be
available to offset cooling. During Stage 1 and 2, with one and two compressors running respectively,
30kW of reheat is available to offset cooling. For rooms with multiple units, Emerson
®
recommends
performing dehumidification via Teamwork Mode to prevent compressor cycling in case of lightly
loaded rooms or having standard Liebert DS units available to perform dehumidification.
Liebert DSE units in dehumidification mode might not hold the temperature setpoint unless there is
sufficient room load. This will allow for better dehumidification of the room. The Liebert DSE will
allow the return air temperature to run down to 68°F (20°C) regardless of the temperature setpoint
during dehumidification mode of operation.
DA080 and DA085 Dehumidification Control
The DA080 and DA085 will run at lower evaporator temperatures than a DA125 and DA150. This
will result in a higher percentage of latent cooling than with a DA125 at a given return air
temperature.
Dehumidification on DA080 and DA085 is possible with only one circuit running. In dehumidification
mode, with one circuit running, a single stage 15kW electric reheat (customer option) is available to
help offset cooling for lightly loaded rooms, but overcooling will be allowed down to 68°F (20°C). If the
unit is running in dehumidification mode with both circuits (compressors) running, the electric reheat
is not available to offset cooling. All Liebert DSE units allow the indoor blower to run at a reduced
speed during dehumidification mode to increase the amount of dehumidification being performed.
- for Liebert DSE 1
- 2
- TABLE OF CONTENTS 3
- 1.0 INTRODUCTION 9
- 2.1.1 System Screen 12
- 5Liebert 13
- Unit Screen 14
- EconoPhase circuit 16
- 2.2.1 Control Interface 17
- 2.2.2 Accessing Submenus 17
- Display Filtering 18
- Liebert iCOM Display Readout 18
- Accessing Submenus 19
- 2.2.3 Entering a Password 20
- Table 3 User menu icons 23
- Table 4 Service menu icons 25
- 3.0 OPERATION 27
- Autorestart 28
- Loss of Power Alarm 28
- Minimum Fan Speed 30
- 3.1.2 Back-Draft Fan Damper 30
- Low-Pressure Time Delay 31
- Advanced DX Freeze Protection 31
- Pump Down Operation 31
- High Pressure Alarm 32
- Operation 33
- 25 Liebert 33
- 3.2 Temperature Control 34
- . If the proportional 35
- 3.2.1 Setting Up PI Control 36
- Temperature Deadband 36
- 3.2.2 Compressor Control 36
- 29 Liebert 37
- System 1 System 2 38
- 3.3.3 Tandem Operation 39
- Additional Reheat Rules 40
- 3.5 Humidity Control 41
- 3.5.1 Humidity Control Types 42
- 3.5.2 Humidification 43
- Infrared Humidifier 43
- 3.5.3 Dehumidification 44
- Dehumidification Low Limit 45
- 39 Liebert 47
- Dehumidification Operation 48
- 41 Liebert 49
- 43 Liebert 51
- Temperature Compensation 52
- Setpoint Manipulated Variable 56
- Controlled Variable 56
- and Liebert 57
- 3.8.1 CANbus Failure 58
- EEV Battery Backup 59
- 3.8.4 Liebert MC 59
- Low Noise / Fan Reversal 60
- 3.8.6 Liebert EconoPhase 61
- 57 Liebert 65
- Event Description 68
- 3.9.2 User Inputs 70
- Table 16 Customer inputs 71
- 3.9.3 Analog Inputs 72
- 3.9.4 Liebert iCOM-DO 73
- Table 20 Event notifications 74
- Calculating Unit Wellness 76
- 69 Liebert 77
- 4.0 TEAMWORK 78
- 4.2.2 No Teamwork 79
- 4.2.3 Teamwork Mode 2 79
- Fixed Speed 80
- Variable Speed 80
- Teamwork 81
- 73 Liebert 81
- Figure 49 Remote sensors 82
- Figure 50 Sensor positioning 82
- 4.2.5 Hardware Setup 83
- 4.3.2 DIP Switch Settings 84
- Unterminated 86
- Terminated 86
- Grounded CANbus Cable 87
- 4.3.7 Software Setup 89
- 4.3.8 Standby—Rotation 90
- Standby and Cascade 90
- Liebert iCOM 95
- I/O Board 95
- Optional Large 95
- Graphics Display 95
- (Rear View) 95
- Liebert vNSA 96
- SITESCAN 97
- 7.0 USER MENU PARAMETERS 98
- 91 Liebert 99
- User Menu Parameters 100
- 7.2 User-Graphic Menu Screens 101
- Event Log 102
- View Network 102
- 95 Liebert 103
- 97 Liebert 105
- 99 Liebert 107
- Active Alarms 108
- 101 Liebert 109
- 103 Liebert 111
- 105 Liebert 113
- 8.0 SERVICE MENU PARAMETERS 114
- Service Menu Parameters 115
- 107 Liebert 115
- 109 Liebert 117
- 111 Liebert 119
- 113 Liebert 121
- 115 Liebert 123
- 117 Liebert 125
- 119 Liebert 127
- 121 Liebert 129
- 123 Liebert 131
- 127 Liebert 135
- 129 Liebert 137
- 131 Liebert 139
- 133 Liebert 141
- Set Alarm Screens, Pages 4-12 142
- 135 Liebert 143
- 137 Liebert 145
- 139 Liebert 147
- 143 Liebert 151
- 145 Liebert 153
- 147 Liebert 155
- 149 Liebert 157
- 151 Liebert 159
- 153 Liebert 161
- 155 Liebert 163
- 161 Liebert 169
- Technical Support / Service 172
- Locations 172
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