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Teamwork
43
4.1.3 Teamwork Mode 1
Teamwork Mode 1 works best in small rooms with balanced heat loads. The return temperature and
humidity sensor readings of all units in operation (fan on) are averaged by the master unit, Unit #1,
and used for control. The master unit will send the operating requirements to all operating units
according to unit numbers, rotated by one unit every 24 hours.
In this teamwork mode, most of the parameters are shared; if set in any one of the units, all other
units will follow with the same settings. AutoSet will adjust the proportional band in Teamwork
Mode 1, see 3.2.1 - Temperature Proportional Band.
The master unit evenly divides the system proportional band among the number of available units.
Each unit will receive instruction on how to operate from the master unit based on how far the system
deviates from the setpoints.
The number of available units is calculated like:
• In non-standby configuration: all units with fan on
• In typical standby function (no cascade): all units with fan on
• In cascade mode: all units that could operate (no alarm, which forces the unit to switch off, unit
not switched off, etc.)
Figure 28 shows how two cooling units work together in Teamwork Mode 1. Since Unit 1 and Unit 2
are available to operate, the master unit, Unit 1, averages the temperature and humidity sensor
readings from each unit.
The master unit determines that a 60% call for cooling is required for the system. Since there are two
available cooling units, each unit makes up half of the system proportional band; Unit 1 handles 0-
50% system call for cooling and Unit 2 handles 51-100%. For every 1% system call for cooling, each
unit provides 2% of its total cooling capacity.
The 60% system call for cooling exceeds the 50% Unit 1 can provide, so Unit 1 operates at full
capacity. The remaining 10% system call for cooling (60% - 50% = 10%) is handled by Unit 2. Unit 2
responds by operating at 20% cooling capacity (50% ÷ 10% = 20%).
Figure 28 Teamwork Mode 1 with two cooling units
NOTE
1. Proportional actuators (chilled water valve, free-cooling actuator) are driven in parallel in
all units.
2. Changeover to second cooling source, low limit during dehumidification and low supply
limit control air local functions, managed from each unit independently.
C1 C2
cooling
+100 %
0%
1/2 Proportional Band
+temp.
Unit 2 Deviation : 20%
Setpoint
C1 C2
cooling
+100%
0%
1/2 Proportional Band
+temp.
Setpoint
0%
Setpoint
- temp.
-100 %
+temp.
1/2 Proportional Band +100%
1/2 Proportional Band
heating
100 %
60%
0%
System Deviation : 60%
System proportional band
Unit 1 Deviation : 100%
- Precision Cooling 1
- 2
- TABLE OF CONTENTS 3
- 1.0 INTRODUCTION 7
- 2.1.1 Control Interface 11
- 2.1.2 Accessing Submenus 11
- 2.1.3 Entering a Password 12
- Figure 6 Entering a password 13
- Figure 9 User menu icons 15
- Table 2 User menu icons 15
- SERVICE MENUS 16
- 3.0 OPERATION 18
- Autorestart 19
- Loss of Power Alarm 19
- Operation 20
- Low-Pressure Time Delay 21
- Pump Down 21
- High Pressure Alarm 22
- 3.2.2 Compressor Control 25
- Compressor Proportional Bands 25
- 3.2.3 Chilled Water Control 28
- Cooling—Free-Cooling 30
- Dual Cooling Source 31
- 3.4.2 SCR Reheat 32
- 3.5.1 Humidification 34
- Infrared Humidifier 34
- 3.5.2 Dehumidification 35
- Dehumidification Low Limit 35
- 3.6 Control Types 36
- 3.7.1 Supply Air 38
- 3.8.1 Hardware Setup 39
- 3.8.2 Software Setup 40
- 3.9.2 User Inputs 42
- 3.9.4 Liebert iCOM-DO 44
- Calculating Unit Wellness 46
- 4.0 TEAMWORK 48
- 4.1.3 Teamwork Mode 1 49
- 4.1.4 Teamwork Mode 2 50
- 4.1.5 Standby—Rotation 50
- Standby and Cascade 50
- Small Displays 54
- Large Displays 54
- Small Graphics Display 56
- Liebert iCOM 57
- I/O Board 57
- Optional Large 58
- Graphics Display 58
- (Rear View) 58
- Liebert vNSA 59
- SITESCAN 60
- 7.0 USER MENU PARAMETERS 61
- Spare Part List 62
- Event Log 62
- View Network 62
- Active Alarms 65
- Figure 45 Sleep mode screen 67
- ERVICE MENU PARAMETERS 68
- Unit Diary—Large Display Only 74
- Set Alarm Screens, Pages 4-8 90
- Service Menu Parameters 100
- SL-18835_REV6_11-10 108
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