Emerson Liebert ICOM-DO User Manual Page 47
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Operation
39 Liebert
®
iCOM
®
for Liebert DSE
™
Tandem Digital Scroll Operation for Dehumidification
When tandem digital scroll compressors are present, the activation and deactivation of
dehumidification will be handled just as it would for conventional compressor operation. The rules
described in this section apply only when dehumidification is active. Further, the activation or
deactivation of compressors for certain alarm conditions, or Suction Pressure Management, take
precedence over the rules described in the ensuing subsections.
The Digital Scroll Ramping % for dehumidification will be overridden by the activation of the
following routines
• Suction Pressure Management (“Freeze Protection”)
• Winter Start (S403 Low Pressure Alarm Delay)
• Capacity Reduction for High Pressure
• Tandem Temporary Digital Loading
• Dehum low limit threshold
When the system goes into dehumidification mode, the sequencing of the compressors and the Digital
Scroll ramp selections become fixed, as does the lead-lag order of the tandem banks. This sequence is:
• Comp 1A
• Comp 2A
• Comp 2B
• Comp 1B
The compressor activation / deactivation points may be adjusted, but they cannot be adjusted so that
the compressor sequence is changed; C2B’s settings cannot be adjusted so that it will turn On before
C1B during dehumidification. The only time sequencing will be adjusted is when compressor alarms
are present during dehumidification. Please consult the corresponding sections below for details on
this mode of operation.
The compressor settings for dehumidification will be visible in the “Tandem Digital Dehum” menu,
which is accessible from the Advanced – Expert Settings menu.
Because of the specialized nature of Tandem Digital Scroll Dehumidification, the setting on line A2
(“Dehumidification with Comp”) will have no effect for dehumidification with Tandem Digital Scroll
Compressors.
Dehumidification Control Details for Return (Normal) Dehum
The Liebert DSE is designed for sensible cooling, so the number of compressors available for
dehumidification are limited by the cooling load.
Dehumidification Entry Criteria
When the call for dehumidification goes above the “RET Dehum: CFD% to start Dehum” parameter
on line A558, the initiation of dehumidification and the compressors it will activate is based on
whether dehumidification was last made inactive by Low Limit 2 (line S133).
- 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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