IOMM AGR AGR 055A through 100A 63
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 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.
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