8.2.2 Control Mode
The compressor and fan are controlled according to temperature (supply air temperature, return air temperature, and
remote temperature) and humidity (supply air humidity, return air humidity, and remote humidity).
Figure 8.4 Control Mode Diagram
Item
Description
1
Each color of this area indicates different status:
•
Green: The unit is On and the temperature within normal range
•
Red: The unit is On and the temperature is not within normal range
•
Grey: The unit is Off
2
Desired humidity set by user
3
Control mode: compressor is controlled according to supply air humidity
4
Control mode: compressor is controlled according to supply air temperature, return air temperature, or remote
temperature
5
Theoretical supply air humidity calculated according to current data
6
Desired supply air temperature, return air temperature, or remote temperature set by user
7
Supply air temperature, return air temperature, or remote temperature, depending on the control mode
Table 8.3 Description of Control Mode Diagram
8.3 Menu Structure and Parameters
For menu structure and parameters, see
8.4 Alarm Information
Press the menu button and choose Alarm Information to check active alarms and historical alarms. Active Alarms show the
active alarms and the time they are generated. Historical Alarms show active alarms and historical alarms, and the time
they are generated and closed (if the alarm has been resolved).
on page 1 lists all the alarms.
NOTE: Alarms are displayed in time sequence, starting with the latest one.
NOTE: Up to 500 historical alarms can be stored. They will not be cleared when unit is powered off.
8 HMI Display
58
Vertiv™ Liebert® CRV CRD25 and CRD35 Row-Based Cooling System User Manual
