McQuay AWS, Operating Manual

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KOMAC00607-09EN 5
General Description
The control panel is located on the front of the unit at the compressor end. There are three
doors. The control panel is behind to left-hand door. The power panel is behind the middle
and right-hand doors.
General Description
The MicroTech III control system consists of a microprocessor-based controller and a
number of extension modules, which vary depending on the unit size and conformation. The
control system provides the monitoring and control functions required for the controlled,
efficient operation of the chiller.
The operator can monitor all critical operating conditions by using the screen located on the
main controller. In addition to providing all normal operating controls, the MicroTech III
control system will take corrective action if the chiller is operating outside of its normal
design conditions. If a fault condition develops, the controller will shut a compressor, or the
entire unit, down and activate an alarm output. .
The system is password protected and only allows access by authorized personnel. Except
that some basic information is viewable and alarms can be cleared without a password. No
settings can be changed.
Control Panel Layout
Figure 1, Control Panel Components
NOTES :
1. The Emergency Switch Relay de-energizes circuit #1 #2 and #3 control power when activated, causing an
immediate compressor and fan shutdown. The red emergency button switch is located on the bottom front
of the control panel door.
2. The control power transformer is located in the power panel adjacent to the control panel.
3. Additional extension (aka extension) modules are located elsewhere on the chiller.