IOMM AGR AGR 055A through 100A 79
Menu #6: Circuit 62 Pressures—The circuit #2 evaporator and condenser refrigerant pressure
readings are displayed under this menu. The calculated minimum and maximum condenser pressure
values are also shown.
Menu #7: Circuit #l Temperatures—The circuit #I refrigerant temperatures are calculated from
their corresponding pressure sensors and displayed here. If the optional Sensors are not present, the
line item will flash “Open”.
Menu #8: Circuit #2 Temperatures—The circuit #2 refrigerant temperatures are calculated from
their corresponding pressure sensors and displayed here. If the optional sensors are not present, the
line item will flash “Open”,
Menu#9: Chiller Amps—Displays the present amp draw of the chiller expressed as a percentage of
the unit rated load amps under full load conditions (optional feature).
Menu #10: Compressor Run Hours—The total run hours for each compressor is available under this
menu.
Menu #11: Compressor Starts—The total number of starts for each compressor is available under
this menu.
Menu#12: Air Temperature—Displays the current outdoor air temperature if the optional OAT
sensor is installed on the air cooled chiller and “Lcl” is selected from Menu 23. Also displayed here
is the air temperature received from a network if the “Rmt” OAT select option from Menu 23 is
selected.
Control Menus
Menus 13 through 23 are the set point menus. All adjustable control parameters and set points, time
schedules, control options, and alarm thresholds are accessed through these menus.
CAUTION
Any changes to these parameters must be determined and implemented by qualified
personnel with a thorough understanding of how these parameters affect the operation of
the unit. Negligent or improper adjustment of these controls may result in damage to the
unit or personal injury.
Menu #13: Control Mode—One of several automatic and manual operating modes may be selected
from within this menu. Typically, the selected control mode will be Automatic which will allow the
MicroTech controller to handle all compressor and condenser fan staging. Refrigerant circuit #2
may be locked off while still allowing circuit #1 to stage automatically by selecting AutoCir#1 -
Off#2 as the operating mode. OffCirc#1 -Auto#2 allows the normal staging of refrigerant circuit #2
but circuit #1 is locked off. Select Manual Staging if manual control is desired. In this operating
mode, the condenser fans are controlled by the MicroTech but the number of stages is determined
manually via the keypad. If manual staging is selected, the second item under this menu indicates
the number of active cooling stages. Use the INCR or DECR keys to increase or decrease the
number of active stages.
Menu#14: Leaving Water Set Points—The leaving water set points, control band, maximum pull
down rate and water reset options are adjusted from this menu. The first menu item is The Active
Set Point ("Active Spt"). The current control temperature is displayed here. The Leaving Chilled
Water Set Point ("Lvg Evap") appear towards the top of this menu. These are the set points that will
be maintained for chillers if no reset options are in effect. The Active Control Set Point ("Active
Spt") will display the calculated chilled or heated water temperature to be maintained when one of
the reset options is enabled.
If the 4-20 milliamp reset option is enabled, the controller will reset the leaving chilled water
temperature to a higher value based on a percentage of the Maximum Chilled Water Reset set point
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