McQuay MAC Specifications download pdf (Page 62)

Control Operation Guide

The unit is equipped with a microprocessor controller board. The microprocessor controller is provided to give

temperature control for the system by accurately measuring the ambient temperature, and controlling the water

entering and water leaving temperature. The temperature setting in the unit is preset in the factory. It is

not recommended to change the setting unless necessary. A wired controller handset is connected to the

microprocessor board. Every parameter setting and reading can be observed from the LCD of the handset.

1. Handset location

The handset is located on a metal bracket behind the right door panel.

2. LED Display (microprocessor board)

The keypad LED will light up when the unit is powered up.

The LCD will light up when the unit is turned on.

3. LCD display (controller handset)

During normal operations, the LCD can display the entering water temperature, the leaving water

temperature, the entering water setpoint temperature, compressor on or off status and outdoor air

temperature. When malfunctioning occurred, the LCD would blink. The display would show the faulty

parameter and the date and time of the occurrence.

4. Controller functioning specification

There is a 3 minute delay for the compressor and fan motor to restart (default setting). During

defrosting, fan motor is not running.

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McQuay MAC Specifications Page 62