Liebert 3000 Auto Restart Delay, IR Flush Overfill infrared humidifiers only, Display in Degrees

Operation with Advanced Microprocessor with Graphics Control

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.

21