Chapter 5 Precision Air Conditioner Controller 37
Liebert_DM 16kW Air Conditioner User Manual
5.4.2 MAIN Interface
If the AC unit is turned on, after successful communication, the MAIN interface will appear on the LCD screen, as
shown in Figure 5-3. If no control button is pressed within 2min, the controller will enter a screen-protection state (the
back lighting is off) until any control button is pressed. In this interface, pressing the UP or DOWN button can regulate
the contrast of the LCD screen. Pressing the UP button brightens the screen and pressing the DOWN button darkens
it.
The MAIN interface provides the following information:
1. Date
2. Time
3. Weekly-date
4. Display board address
5. Interface board address
6. Actual temperature
7. Temperature setpoint
8. Actual humidity
9. Humidity setpoint
10. Unit working icons (including fan,
cooling, humidifying, dehumidifying,
heating, general alarm, locking and
on/off/standby state)
11. Humidity graph within 1h
12. Temperature graph within 1h
T=01
22:15
T=01
22:15
+15
50
-15
+15
24
-15
RT 51%rH
RT 24 C
o
2007/04 /13 09 :00:00
D00 I00
FRI
SP 24 C
o
SP 50%rH
Date
Time weekly-date
Display board
address
Interface board address
Temperature graph
Humidity graph
Unit working icons
Actual temperature
Temperature setpoint
Actual humidity
Humidity setpoint
Figure 5-3 MAIN interface
Unit working icon
The MAIN interface provides three types of unit working icons, including dynamic running state icon, locking state icon
and on/off/standby state icon. These icons inform the operators of the operation mode in which the AC unit is working.
The icons and their definitions are listed in Table 5-3.
Table 5-3 Icon definitions
Mode
Icon
Definition
Mode
Icon
Definition
Dynamic
running state
icons
Fan running
Locking state
icons
Locking state
Cooling state
Unlocking state
Heating state
On/off/standby
state icons
Standby state
Humidifying state
Shut-down state
Dehumidifying state
Running state
General alarm
Temperature graph
The temperature graph indicates the difference between the actual temperature and temperature setpoint. The
15 (-15) on the right side of this graph is the difference between the max. (min.) temperature and the
temperature setpoint. For example, the actual temperature of the point at +15 position is 39°C (= 15°C + 24°C).
Humidity graph
The humidity graph indicates the difference between the actual humidity and the humidity setpoint. The 15
(-15) on the right side of the humidity graph is the difference between the max. (min.) humidity and humidity setpoint.
For example, the actual humidity of the point at -15 position is 35%RH = (50%RH + (-15%RH)).
