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AGR 070A through 100A Product Manual AGR-3
MicroTech Control (optional on R-22, standard on R-134a)
Exclusive microprocessor control is common throughout McQuay equipment. The interface is a 12 key
keypad and 2-line, 40 character backlit liquid crystal display. The MicroTech continuously performs
self-diagnostic checks on all system temperatures, pressures, and equipment protection controls, and
will automatically shut down a circuit or the entire unit at fault conditions. The cause, time, and date of
the occurrence is recorded and can be displayed. The seven previous incidents are kept in memory for
service reference.
If a fault occurs, the controller takes preventive measures in an effort to keep the unit operating; staging
down capacity, activating a pre-alarm signal, and automatically switching to the alarm menu on the
display. Pre-alarms are self-clearing when the fault condition is no longer present.
Critical shutdown alarms such as high condenser pressure (with mechanical back up), freeze protection,
oil pressure (with mechanical back up), and low evaporator pressure are manual reset and must be
cleared at the keypad to resume operation.
Choose the MicroTech control and Open Protocol options to interface with virtually any building
management system and perform remote monitoring and control by hard wiring or modem. A nominal
site license fee is required for BAS interface.
A single chiller can connect directly to the BAS. Two or more units will require an Open Protocol
Panel (OPM) for connection.
One hundred feet of sensor cable is included, rolled up in the control panel, on remote evaporator
models.
NOTE:
The MicroTech control is required on R-134a applications.
Figure 4, Optional MicroTech Control Panel
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