Liebert Dse-Basic Control System Overview; Figure 38 Basic Control System Overview; Figure 39 Primary Control Operation Overview - Emerson Liebert iCOM Manual

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

Setpoint
User-Entered Air
Temperature Setpoint
Run command
from Liebert iCOM
Run command
from Liebert iCOM
® ®
Liebert iCOM for Liebert DSE
™
.
Manipulated Variable
Pump Speed /Compressor Capacity
Liebert DSE
With Liebert
iCOM
Pump Discharge Valve
Liebert
EconoPhase
Condenser
Fan Speed
Global
Condenser
™
Controlled Variable
Liebert iCOM
Air
Temperature
(Control Supervisor)
Setpoint
Liebert EconoPhase changes
Pump Differential
pump speed based on Liebert
Pressure
DSE commands through CANbus
Refrigerant
Global Condenser changes fan
Temperature
speed based on Liebert DSE
commands through CANbus
48
Operation
™