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Microprocessor Control
43 Liebert
®
Mini-Mate2
™
6.9.5 Valve Time (for Systems With a Modulating Chilled Water Valve)
This function shows the full valve travel time of the modulating valve on a chilled water system. This
is the time it takes for the valve to travel from full closed to full open. It is programmable from 50 to
250 seconds; factory default time is 165 seconds and should not be changed. The full valve travel time
is used by the control to determine the appropriate valve position. For example, if the valve travel
time is 165 seconds and 50% cooling is being called for, the valve will open for 83 seconds to achieve
50% open.
6.9.6 CW Flush (for Systems with a Modulating Chilled Water Valve)
This function shows the interval time at which the system will perform a modulating chilled water
valve system flush cycle. The factory default is 24 (hours) and is programmable from 0 (hours) which
signifies to never flush, to 99 (hours) which signifies to flush after every 99 hours of valve non-use. If
the valve is called on by the control to open within the programmed interval time, the timer will be
reset to 0. The flush cycle is active even when the fan is turned off, but power is applied to the unit.
When the interval timer reaches the programmed time, the valve will be opened for 3 minutes to flush
any contaminants that may have collected in the system.
6.10 Change Passwords
The display will prompt the operator to enter a three digit password when attempting to make
changes. The system includes two (2) passwords, one for setpoints and one for setup. The system
allows the password to be changed by first entering the default password set at the factory (1-2-3) for
setpoints and (3-2-1) for setup. The password function provides system security so that only
authorized personnel are allowed to make changes to the system. (If unauthorized changes are being
made, the passwords may be compromised and new ones should be selected). The password function
can be disabled by setting DIP switch 8 in the wall box to OFF, then resetting power to the unit.
6.11 Calibrate Sensors
The temperature and humidity sensors can be calibrated by selecting the CALIBRATE SENSORS
menu item. The temperature sensor can be calibrated ±5°F, while the humidity sensor can be
calibrated ±10% RH. When calibrating the humidity sensor, the value shown will always be % RH,
even though absolute humidity control may be selected. If absolute humidity control is selected, the
Normal Status Display will display the adjusted reading. This reading may not agree with the
relative humidity reading displayed while in calibration.
If the sensors are subject to frequent wide temperature and humidity swings, it may be necessary to
shorten the cycling by increasing the sensor time delay. If the sensors are located too close to the air
discharge, they will likely experience rapid swings in measurement. Another method in reducing
compressor cycling is to increase the temperature and/or humidity sensitivity.
Table 18 Setup functions, default values and allowable ranges
Function Default Range
Restart Time
Delay
0.1 0 to 9.9 min
(0 = manual restart)
C/F Degrees
°F °C or °F
Humidity Control Rel Relative or Absolute
Valve Time 165 50 to 250 seconds
CW Flush 24 0 to 99 hours