McQuay AGR 070AS User Manual

58 AGR 070A through 100A IOMM AGR-1
MicroTech Controller Installation and Operation
All operational descriptions are based on the MicroTech controller software versions AGR2E01A.
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 250-6 microprocessor based controller which provides
all control functions. The operator can review and change operating parameters from the interface
keypad that 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 that allows access by authorized personnel.
The operator must enter a valid password into the panel 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.

McQuay AGR 070AS Specifications

General

Brand	McQuay
Model	AGR 070AS
Category	Chiller
Language	English