IOM 686 AGZ 030A through 065A 67
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: ChillerAmps-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 wafer 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
("MaxChWRst"). At 4mA or less, no reset will occur. At 20mA, the chilled water set point will be
reset to a value equaling the Leaving Evaporator Water Set Point ("Lvg Evap") plus the value stored in
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