Specifications

8 Catalog WMC-4
Control Features
The operator interface panel has a 15-inch Super
VGA touch-screen, utilizing graphics to provide
clear and concise information on the chiller status,
(see page
WMC Chillers Feature MicroTech II
®
It is only fitting that the world’s most
revolutionary chiller design be matched with the
advanced McQuay MicroTech II control
technology to give you the ultimate in chiller
performance and control. The control includes
many energy-saving features and interface
enhancements not found in any other unit
controller system on the market today. MicroTech
II controller's innovative design will help keep
your chiller running efficiently . . . day in, day out,
for years to come.
11) alarms, trends, and setpoint
adjustment. Should the touch-screen become
inoperable, the unit and compressor controllers
will continue uninterrupted operation of the
chiller.
The unit controller minds those functions that are
common to the chiller as a whole (pumps, cooling
tower, valves, etc.) and is the interface point for
BAS connection and other control inputs to the
chiller, as well as outputs such as operation of the
electronic expansion valve.
Control Architecture
Each of the two compressor controllers is
dedicated to a compressor and controls its
operation, as well as providing data for use by
other system component.
The WMC chiller takes advantage of McQuay’s
30 years of experience in designing and
manufacturing their highly regarded WDC line of
conventional, dual centrifugal compressor chillers.
Distributed control components provide flexibility
and redundancy.
Figure 3, Major Control Components
OPERATOR
INTERFACE TOUCH-
SCREEN
UNIT
CONTROLLER
#1 COMPRESSOR
CONTROLLER
#2 COMPRESSOR
CONTROLLER
Color Graphics, Touch-Screen
Interface, View Data, Input
Setpoints, Stores History
UNIT
Analog Inputs
Analog Outputs
Digital Inputs
COMPRESSORS
Analog Inputs
Analog Outputs
Digital Inputs
Digital Outputs
BAS
Universal
Comm.
Network