8.9.6 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.
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
Table 8.3 Setup functions, default values and
allowable ranges
8.10 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.
8.11 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.
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 60
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