Specifications

Cat 604-5 7
Features and Benefits
and at 90°F (32°C) ambient temperature). When service is
required, the refrigerant charge can be pumped down into the
condenser by compressor operation and use of a refrigerant
transfer unit. Elimination of the cost and space requirements of
an external storage tank is a significant Daikin advantage.
Unit Control Features
The Magnitude chiller control system consists of three major
components: the unit control panel and the operator interface
panel and the VFD power panel. The touch screen panel is on
an adjustable arm so that it can be positioned comfortably for
the operator. The control panel contains a USB port for
downloading the unit's fault history, major parameter trends,
and unit operating manual that is stored in memory.
By constantly monitoring chiller status and real time data, the
MicroTech E 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 stay online. If the
pressure continues to rise, the unit will shut off as a safety
feature.
User-Friendly Touch Screen Panel
Operation simplicity was one of the main considerations in the
development of the MicroTech E controller. The operator
interface is a 15-inch, Super VGA color touch-screen monitor,
mounted on an adjustable arm. Key operating parameters and
setpoints are easily accessible.
For added convenience, the unit Operating and Maintenance
manual is viewable on the touch-screen panel.
Figure 2: MicroTech E Home Screen
The MicroTech E controller's memory retains a record of faults
and the time/date stamp. The controller memory (no batteries
required) retains the fault history for troubleshooting and
monitoring unit performance.
The MicroTech E controller can record and plot water
temperatures, refrigerant pressures, and motor load in order to
trend performance. These values can also be downloaded
through a convenient USB port in the control panel, and
exported into a spreadsheet for further evaluation and record
purposes.
MicroTech E Controller Increases Chiller Economy
Smart features that optimize operating efficiency have been
incorporated into our MicroTech controls:
Cooling tower control-Analog outputs can optimize condenser
water temperature by modulating the cooling tower fan and/or
bypass valve VFDs. Digital outputs to cycle up to three tower
fans are also available.
Direct control of water pumps- Digital output relays provide
automatic lead-lag of the evaporator and condenser pumps,
permitting pump operation only when required.
Chilled-water reset- Accomplished directly on the unit or
remotely by resetting the leaving water temperature based on
the return water temperature. Raising the chilled water setpoint
during periods of light loads can dramatically reduce electrical
consumption.
Demand limit control- Maximum motor current draw can be
set on the panel, adjusted from a remote 4-20 ma signal, or set
via the BAS interface using the Open Choices feature. This
feature controls maximum demand charges during high usage
periods.
Staging Options (Multiple Chiller Installations)- “The WME
onboard chiller controls are designed to offer chiller staging
and loading options for up to eight WME chillers on multiple
chiller plant configurations. Contact the Chiller Applications
department for more information on this capability.”
Safe Power Interruption - In the event of a power failure, the
compressor motor acts as a generator, providing power for the
bearing control system during coast down. It also has a backup
bearing system.
Quality Standards
AHRI Certification
We have an on-going commitment to supply chillers that
perform as specified, and participate in the AHRI Certification
Program. On-going performance verification of chiller
capacity and power input plus AHRI certified selection output
provide the owner with specified performance in accordance
with the latest version of AHRI Standard 550/590.
LEED®
Building owners who wish to pursue Leadership in Energy and
Environmental Design (LEED®) Green Building Certification,
the performance of the WME may contribute points towards
Energy and Atmosphere (EA) Credits 1 and 4.
Points earned for EA Credit 1 are awarded based on overall
building efficiency. The great efficiency of the WME will
contribute to the total points earned for this credit.
EA Credit 4 qualification is partially determined by tonnage
and refrigerant quantity. Vessel stack and tube count selections