Specifications

MicroTech II Control Features and Benefits
FEATURE BENEFIT
Easy integration into Building Management
System via McQuay’s exclusive Open
Choice™ communication module
Designer can select any BAS supplier using
standard open protocols and know the
MicroTech II control will interface with it.
Operators can observe chiller operation at a
glance and easily select various data screens
and change setpoints
Easy to read, adjustable, 15 inch, Super VGA
color touch screen operator interface
Water temperatures, refrigerant pressures, and
motor load plots can provide valuable
information for energy conservation
Historic trend data-downloadable
Provides stability in chilled water system
Precise ± 0.2 °F chilled water control
Proactive pre-shutdown correction of
“unusual conditions” allows chiller to stay
li
Activates alarm and modifies chiller operation to
provide maximum possible cooling
Automatic control of chilled water and
condenser water pumps
Integrated lead/lag and automatic engagement
of backup pump
Controls up to four stages of tower fans and
modulation of tower fan and/or bypass valve
Optimum integrated, efficient, control of cooling
tower water based on system conditions
Twenty-five previous alarm descriptions are
stored in memory
Invaluable asset in trouble shooting
Operating and maintenance manuals plus
unit parts lists stored in memory
Information instantly available (downloadable)
for the life of the unit.
Multiple language capability
Great asset for world-wide applications
metric, in-lb
Designed with the Operator in Mind
Reliable, economic use of any chiller depends
largely on an easy operator interface. That’s why
operation simplicity was one of the main
considerations in the development of MicroTech
II controller. The operator’s interface with the
chiller is through a 15-inch, Super VGA color
monitor with touch-screen capability. The
operator can clearly see the entire chiller
graphically displayed with the key operating
parameters viewable on the screen. Pressing a
single on-screen button will access the set screens
where setpoints can be reviewed and changed, if
necessary. Other screens, such as alarm history,
are easily accessed through touch screen buttons.
See the following page for some typical screens.
By constantly monitoring chiller status, the
MicroTech II controller will automatically take
proactive measures to relieve abnormal
conditions or shut the unit down if a fault occurs.
For example, if a problem occurs in the cooling
tower and discharge pressure starts to rise, the
controller will automatically hold the load point
and activate an alarm signal. A further rise in
pressure will initiate compressor unloading in an
effort to maintain the setpoint pressure and stay
online. If the pressure continues to rise, the unit
will shut off at the cutout pressure setting.
10 Catalog WMC-4