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IOMM ACZ/AGZ-1
MicroTech Controller, AGZ-AM
All operational descriptions are based on the MicroTech controller software versions AGZ2E01A.
Operating characteristics and menu selections may vary with other versions of software. Contact
McQuay Technical Support for software update information.
General Description
The MicroTech control panel contains a model 250-06 microprocessor based controller which provides
all control functions. The operator can review and change operating parameters from the interface
keypad which consists of twelve input keys and a two line by sixteen character display. In addition to
providing all normal operating controls, the controller monitors all safety devices on the unit and will
shut the system down and alarm through a set of dedicated alarm contacts. Important operating
conditions at the time of the alarm are retained in the controller’s memory to aid in troubleshooting and
unit diagnostics. McQuay MicroTech Monitor software is available for remote adjustment and
monitoring of the chiller.
The system is protected by a simple password scheme which allows access by authorized personnel.
A valid password must be entered into the panel by the operator before any setpoints can be
changed.
Optional Sensor Packages
•
Refrigerant Sensor Package
§
Suction line temperature, circuit #1
§
Suction line temperature, circuit #2
§
Liquid line temperature, circuit #1
§
Liquid line temperature, circuit #2
•
Unit amp package
§
Unit amperage - Percent total unit amperage including compressors and condenser fans.
Does not include externally powered equipment such as water pumps.
Installation
The MicroTech controller is shipped factory tested with default values for the type of refrigerant. All
control values must be entered for the specific application of the chiller.
Sensors and transducers
Sensors and transducers are mounted and connected to the analog / digital input (ADI) board with
shielded cable. The evaporator and condenser pressure transducers depress the Schrader fittings and
can be replaced without pumping the unit down. The pressure transducers are connected to the
MicroTech analog inputs with IDC connectors (Insulation Displacement Connectors). High pressure
transducers have a red dot and low pressure transducers have a blue dot. Water sensors are in
thermal wells for easy replacement without draining the water system. Optional refrigerant line
temperature sensors are in a copper sleeve brazed to the appropriated refrigerant line.
Control wiring
Low voltage control wiring is installed, labeled and tested by the factory before shipment.
Remote 4-20 milliamp signals
Signals for leaving water reset or demand limit are provided by the installing contractor and connected
to the terminal block as indicated by the unit wiring diagram. See Field Wiring diagram for details.
Summary of Contents for ACZ 045A
Page 6: ...6 IOMM ACZ AGZ 1 Figure 3 Clearance Requirements...
Page 27: ...IOMM ACZ AGZ 1 27 Figure 12 AGZ AM Single point Connection with FanTrol...
Page 28: ...28 IOMM ACZ AGZ 1 Figure 13 AGZ AM Single point Connection with SpeedTrol...
Page 29: ...IOMM ACZ AGZ 1 29 Figure 14 AGZ AM Unit Control Schematic UNT...
Page 30: ...30 IOMM ACZ AGZ 1 Figure 15 AGZ AM Staging Schematic UNT...
Page 31: ...IOMM ACZ AGZ 1 31 Figure 16 AGZ AM MicroTech Controller Schematic...
Page 32: ...32 IOMM ACZ AGZ 1 Figure 17 AGZ AM Unit Control Schematic MicroTech...
Page 33: ...IOMM ACZ AGZ 1 33 Figure 18 AGZ AM Staging Schematic MicroTech...
Page 34: ...34 IOMM ACZ AGZ 1 Figure 19 ACZ Field Connection Diagram No Capacity Control...
Page 35: ...IOMM ACZ AGZ 1 35 Figure 20 ACZ Field Wiring Diagram Capacity Control Staging...
Page 104: ...Post Office Box 2510 Staunton Virginia 24402 2510 USA 800 432 1342 www mcquay com...
