McQuay AGZ 035A Installation, Operation And Maintenance Manual Download Page 71

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IOMM AGZ-3

AGZ 035A through 065A

Press the Next Item key. The display will show the current Day, Hour, Minute and Second. If this
information needs to be changed, follow the same procedure used to set the Date in the previous
section.

Menu #20

: Daily Schedule—This section will help you to set the Daily Start/Stop time for automatic

operation of the chiller. Pressing the Next Menu key and the Next item key will advance the display to
the Daily Time Schedule. This is where the Start and Stop times for each day of the week will be set
using the 24 hour format. Beginning with Sunday, use the Incr and Decr keys to set the desired start
and stop time and press the Enter key to store the information in the controller. If the chiller is to be
programmed to run continuously 24 hours a day, set the stop tie for 1 minute before start time
(Stop=23:59; Start=00:00). Press the Next Item key to advance through the remaining week days and
Holiday Start/ Stop times.

Menu #21:

Holiday Date—Up to 14 holiday dates can be entered. When the MicroTech controller's

current date matches a date set in the holiday schedule, the normal daily start/stop times are replaced
by the holiday start/stop ties which were set in the previous section. At the date prompt, use the Incr
and Decr keys to set the first holiday month and press Enter to advance to the Day position of the
display. Use the lncr, Decr and Enter keys to set the first day of the holiday. Press Next Item to
advance to Holiday 1 Duration. If the scheduled holiday spans more than one day, use the lncr and
Decr keys to set the holiday duration and press Enter to store the information in the controller. Use the
Next Item key to set additional holiday dates and durations for the entire year.

Menu#22:

Alarm Set Points—On a call for cooling or heating, the controller will open the liquid line

solenoid valve. When the evaporator pressure rises above the Low Pressure Cutin set point, the first
compressor will be started. The Low Pressure cut out set point determines the point at which the
compressors will shut off during a pumpdown sequence. The Refrigerant Freeze and Water Freeze
alarm set points can be adjusted as required. Water and refrigerant freeze alarm time delays can also
be adjusted for this menu. If the condenser High Pressure set point is exceeded, the controller will
shut off the unit.

Menu #23:

Miscellaneous Setup—Several general operating characteristics are defined here. These

are set at the factory prior to unit delivery and should not require adjustment. The control software
version number is displayed form this menu. Outdoor air temperature is displayed on Menu 12.

Alarm Menus

Menus 24 through 27 are used to display any alarm conditions that can be present in the unit. The date
and time when the alarm occurred accompany all alarm messages. Important operating conditions at
the time of the alarm are stored in the controller's memory and can be viewed within the following
alarm menus.

Menu #24:

Circuit #1 Current Alarm—If refrigerant circuit # 1 is in an alarm condition, the

appropriate alarm message will be displayed here. The temperature and pressure readings at the time
of the alarm will be stored in the controller's memory and can be displayed for analysis from this
menu.

Menu #25:

Circuit #2 Current Alarm—If refrigerant circuit #2 is in an alarm condition, the

Menu #26:

Circuit #1 Previous Alarm—The alarm type for the last recorded circuit #1 alarm can be

displayed from this menu. The time and date at which the previous alarm occurred are also displayed
here. This information will be replaced when a current alarm condition is cleared.

Menu #27:

Circuit #2 Previous Alarm—The alarm type for the last recorded circuit #2 alarm can be

displayed from this menu. The time and date at which the previous alarm occurred are also displayed
here. This information will be replaced when a current alarm condition is cleared.