Operation with Advanced Microprocessor Controls 7
2.5.2 Setup System
The Setup System menu includes the following selections:
• SETUP OPERATION
• SELECT OPTIONS
• CALIBRATE SENSORS
• SHOW DIP SWITCHES
• SETUP ALARMS
• HUM CONTROL METHOD
• ANALOG SETUP
• SET STATUS DISPLAY
• CALIBRATE ACTUATOR
Setup Operation
The SETUP OPERATION menu permits the review and/or adjustment of the unit configuration. This
may include:
Cold Start. This feature, also referred to as Positive Start or Winter Start Kit, allows for the low pres-
sure switch to be ignored for the programmed time during a cold start of the compressor. Entering a
“0” for this time will bypass this feature. A “1”, will bypass the low pressure switch for one minute, a
“2” for two minutes, etc. The programmed value can be from 0 to 3 minutes. This delay is factory set to
0 for water cooled, glycol cooled, and GLYCOOL units. Typically, only air cooled units need a “Winter
Start” delay time.
Restart. This feature allows for the unit to restart automatically after a loss of power. The pro-
grammed value is in 0.1 minute (6 seconds) intervals. A programmed value of zero (0) would require
the user to manually press the ON/OFF key to start the unit, i.e. no auto restart. The purpose of this
feature is to prevent several units from starting at the same time after a loss of power. The message
“Restart Delay -- Please Wait” will be displayed when the system is in the auto restart mode. Liebert
suggests multiple unit installations be programmed with different auto restart times.
Dual Cool/Econ-O-Coil Flush. This feature will flush the respective coil for three (3) minutes after
the programmed number of hours of non-use. For example, if the flush time is programmed with 24
hours on an Econ-O-Coil system, and Econ-O-Coil is not required for a 24 hour period, the Econ-O-
Coil valve will be open for 3 minutes to allow the coil to be flushed. The programmed value can be
from 0 (no flush) to 99 (99 hours of non-use).
F/C Degrees. The control can be selected to show readings and setpoints in either degrees Fahrenheit
(F) or Celsius (C).
Min CW Temp. (Dual cooling units only) This feature permits the user to select the minimum chilled
water temperature that permits simultaneous operation of the chilled water control and compressor
control. Below this minimum chilled water temperature setpoint, the control will operate ONLY the
chilled water control, i.e., the compressor is locked out. Above the minimum chilled water tempera-
ture setpoint, assuming the chilled water temperature is below the return air temperature, the con-
trol will operate the chilled water control and compressor control simultaneously if necessary to
satisfy the cooling/dehumidification requirements.
The following table lists the setup functions, their factory default values, and the allowable program-
ming ranges.
Table 2 Setup functions, default values and ranges
Function Default Range
Cold Start Time Delay* 3 0 to 3 min (0 = no delay)
Restart Time Delay 0.1 0 to 9.9 min (0 = manual restart)
Chilled Water Coil Flush 24 0 to 99 hrs (also Econ-O-Coil)
F/C Degrees F F or C
Min CW Temp 45 32° to 72°F
*Factory set to 0 for water cooled, glycol, and GLYCOOL units.
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