Product manual

KPMWC00905-10EN - page 10/24
Controller features and benefits
FEATURE BENEFIT
Easy integration into Building Management System
Designer can select any BAS supplier using standard
open protocols and know the MicroTech II control will
interface with it.
Easy to read, adjustable, Super VGA colour touch
screen operator interface
Operators can observe chiller operation at a glance and
easily select various data screens and change setpoints
Historic trend data-downloadable
Water temperatures, refrigerant pressures, and motor
load plots can provide valuable information for energy
conservation
Precise ± 0.2 °F chilled water control Provides stability in chilled water system
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
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 the MicroTech II controller. The operator’s interface with the chiller
is through a compact 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.
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.
The MicroTech II controller's memory retains a record of faults and the time/date stamp. The controller's memory (no
batteries required) can retain and display the cause of the current fault and the last twenty-five fault conditions. This
method for retaining the fault is extremely useful for trouble shooting and maintaining an accurate record of unit
performance and history. The controller features a two-level password security system to provide protection against
unauthorized use.
The Home Screen shown in Figure 8 is usually used as the primary viewing screen. It provides real time data on unit
status, water temperatures, chilled water set point and motor amp draw
Many standard features have been incorporated into MicroTech II control in order to maintain the operating economy of
WMC chillers. In addition to replacing normal relay logic circuits, the controller's energy saving capabilities are enhanced
with the following features:
• Direct control of water pumps
. Optically isolated, digital output relays provide automatic lead-lag of the
evaporator and condenser pumps, permitting pump operation only when required.
• User-programmable compressor soft loading.
Prevents excessive power draw during pull down from high
unoccupied chilled water temperature conditions.