Operation
Liebert
®
iCOM
®
for Liebert DSE
™
48
3.7 Liebert DSE—Basic Control System Overview
The Liebert DSE with Liebert EconoPhase system includes three primary control systems:
• Liebert DSE (Indoor unit)—Contains the Liebert iCOM control board, large Liebert iCOM
display, compressors, reheat, humidifier, evaporator fans and evaporator coil and electronic
expansion valves.
• Liebert EconoPhase (Outdoor Economizer)—Contains two Liebert iCOM pump control
boards, refrigerant pumps and valves
• Liebert
®
MC Outdoor Condenser—Contains one Liebert premium efficiency control board per
condenser unit, fans and microchannel condenser coil
These devices are connected by a CANbus (Controller Area Network) connection, which is described
in more detail in 3.8 - CANbus Connections Between the Liebert DSE, Liebert EconoPhase
™
and Liebert MC
™
.
Figure 38 Basic Control System Overview
Figure 39 Primary control operation overview
Pump Discharge Valve
Liebert DSE
With Liebert
iCOM
User-Entered Air
Temperature Setpoint
Setpoint Manipulated Variable
Pump Speed /Compressor Capacity
Controlled Variable
Air
Temperature
Setpoint
Liebert iCOM
(Control Supervisor)
Liebert
EconoPhase
Run command
from Liebert iCOM
Pump Differential
Pressure
Liebert EconoPhase changes
pump speed based on Liebert
DSE commands through CANbus
Global
Condenser
Condenser
Fan Speed
Refrigerant
Temperature
Global Condenser changes fan
speed based on Liebert DSE
commands through CANbus
Run command
from Liebert iCOM
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