InTroduCTIon
www.DaikinApplied.com 7 IOM 1266-2 • MAGNITUDE
®
MODEL WME CHILLERS
The Control System
The MicroTech
®
control system consists of a Human Machine
Interface (HMI), a microprocessor-based unit controller, and
compressor on-board controllers, providing monitoring and
control functions required for efcient chiller operation.
The MicroTech
®
controllers acquire and process data related
to chiller operation, issue instructions to various components of
the chiller, and maintain controlled operation of the chiller. As
a part of operating the chiller successfully, the unit controller
offers necessary condenser water control. See “Condenser
Water Temperature Control” on page 19 for more
information.
The MicroTech unit controller also communicates with the HMI
for graphic display and is located in the unit control panel, as
shown in Figure 4. The on-board compressor controllers are
located in each compressor control panel, shown in Figure 3.
A single HMI is used per unit. The HMI panel, see Figure
1, is mounted on a moveable arm to allow placement in a
convenient position for the operator. The HMI, see Figure 2 for
an example of a screen display, is the device used for viewing
unit information and entering setpoints into the control system.
Select information from the HMI panel can be downloaded
via a USB port located on the left side of the panel. For more
information on the HMI, see “Human Machine Interface (HMI)”
on page 27.
Figure 2: Representative HMI Screen
Figure 3: Compressor Control Panel Figure 4: Unit Control Panel
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