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Operation with Advanced Microprocessor with Graphics Control
21
Auto Restart Delay
This feature allows for the unit to restart automatically after a loss of power. The programmed value
is .1 minute (6 seconds) intervals. A programmed value of zero (0) would require the user to manually
press the ON/OFF switch to start the unit, i.e. no auto restart. The purpose of this feature is to pre-
vent 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 pro-
gramming multiple unit installations with different auto restart times.
IR Flush Overfill (infrared humidifiers only)
An autoflush system automatically controls a water makeup valve to maintain proper level in the
infrared humidifier water pan during humidifier operation. If humidification is needed and 30 hours
have elapsed since the last time the humidifier was on, then the humidifier is held off until the valve
completes an initial fill of the humidifier pan. This pre-fill is about 15 seconds. The valve continues to
fill and flush the pan for about 4 minutes.
During humidifier operation, with the flush rate set at the default of 150%, the valve is opened peri-
odically to add water to the pan (about 40 seconds for every 9-1/2 minutes of humidifier operation).
This adds enough water to the pan to cause about a third of the total water used to be flushed out the
overflow standpipe located in the humidifier pan. This flushing action helps remove solids from the
pan. The flush rate is adjustable from 110% to 500%. If the water quality is poor, it may be desirable
to increase the water flushing action above the normal 150% rate. Also, if the supply water pressure
is low, the flush rate adjustment can be increased so that sufficient water level is maintained during
humidification.
Chilled Water/Hot Water/Econ-O-Coil Flush
This feature will flush the respective coil for 3 minutes after the programmed number of hours of
non-use. For example, if the flush time is programmed with 24 hours on a hot water reheat type sys-
tem, and heating is not required for a 24 hour period, the hot water valve will be opened 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).
Display in Degrees
The control can be set to display readings and setpoints in either degrees Fahrenheit (F) or
Celsius (C).
Default Settings and Ranges
The following table lists the setup functions, their factory default values, and the allowable ranges for
which they can be programmed.
Table 9 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)
Infrared Fill Rate 150 110 to 500%
Chilled/Hot Water Coil Flush 24 0 to 99 hrs (also Econ-O-Coil)
C/F Degrees F C or F
*Factory set to 0 for water cooled, glycol, and GLYCOOL units.